Relevant bibliographies by topics / Sedimenti

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Sedimenti'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 March 2023

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Journal articles on the topic "Sedimenti"

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Li, Na, Tao Chen, Dan Cheng, Xun-Jun Xu, and Jian He. "Chitinophaga sedimenti sp. nov., isolated from sediment." International Journal of Systematic and Evolutionary Microbiology 67, no. 9 (2017): 3485–89. http://dx.doi.org/10.1099/ijsem.0.002150.

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Xie, Fuquan, Shengxiang Pei, Yubian Zhang, Yun Tian, and Gaiyun Zhang. "Nesterenkonia sedimenti sp. nov., isolated from marine sediment." Archives of Microbiology 203, no. 10 (2021): 6287–93. http://dx.doi.org/10.1007/s00203-021-02596-w.

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Xie, Fuquan, Shengxiang Pei, Yubian Zhang, Yun Tian, and Gaiyun Zhang. "Nesterenkonia sedimenti sp. nov., isolated from marine sediment." Archives of Microbiology 203, no. 10 (2021): 6287–93. http://dx.doi.org/10.1007/s00203-021-02596-w.

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Lee, Jae-Jin, Yeon-Hee Lee, Su-Jin Park, et al. "Deinococcus sedimenti sp. nov. isolated from river sediment." Journal of Microbiology 54, no. 12 (2016): 802–8. http://dx.doi.org/10.1007/s12275-016-6361-8.

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Schmidt, Christiane, Emmanuelle Geslin, Joan M. Bernhard, et al. "Deposit-feeding of Nonionellina labradorica (foraminifera) from an Arctic methane seep site and possible association with a methanotroph." Biogeosciences 19, no. 16 (2022): 3897–909. http://dx.doi.org/10.5194/bg-19-3897-2022.

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Abstract. Several foraminifera are deposit feeders that consume organic detritus (dead particulate organic material with entrained bacteria). However, the role of such foraminifera in the benthic food web remains understudied. Foraminifera feeding on methanotrophic bacteria, which are 13C-depleted, may cause negative cytoplasmic and/or calcitic δ13C values. To test whether the foraminiferal diet includes methanotrophs, we performed a short-term (20 h) feeding experiment with Nonionellina labradorica from an active Arctic methane-emission site (Storfjordrenna, Barents Sea) using the marine methanotroph Methyloprofundus sedimenti and analysed N. labradorica cytology via transmission electron microscopy (TEM). We hypothesised that M. sedimenti would be visible post-experiment in degradation vacuoles, as evidenced by their ultrastructure. Sediment grains (mostly clay) occurred inside one or several degradation vacuoles in all foraminifers. In 24 % of the specimens from the feeding experiment degradation vacuoles also contained bacteria, although none could be confirmed to be the offered M. sedimenti. Observations of the apertural area after 20 h incubation revealed three putative methanotrophs, close to clay particles, based on bacterial ultrastructural characteristics. Furthermore, we noted the absence of bacterial endobionts in all examined N. labradorica but confirmed the presence of kleptoplasts, which were often partially degraded. In sum, we suggest that M. sedimenti can be consumed via untargeted grazing in seeps and that N. labradorica can be generally classified as a deposit feeder at this Arctic site.
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Mihevc, Andrej. "Nove interpretacije fluvialnih sedimentov na Krasu." Dela, no. 28 (December 1, 2007): 15–28. http://dx.doi.org/10.4312/dela.28.15-28.

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Predstavljene so pomembne brezstrope jame s fluvialnimi sedimenti na Divaškem krasu, v Matarskem podolju in Podgorskem krasu. Opisana je njihova prostorska razprostranjenost ter odnos do obstoječih jam in kraškega površja ter njihov geomorfološki pomen. Sedimenti iz njih so bili analizirani in datirani z različnimi metodami. Največja starost sedimentov je bila ugotovljena v brezstropi jami v Črnotiškem kamnolomu. V njej so na steni ohranjeni fosilni ostanki jamske vodne živali Marifugia cavatica prekriti s 3,2-4,1 Ma starimi sedimenti.
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Wang, Yuxin, Xiaomei Ye, Xiangping Kong, et al. "Parvibaculum sedimenti sp. nov., A Novel Soil Bacterium Isolated from Sediment." Current Microbiology 77, no. 9 (2020): 2056–63. http://dx.doi.org/10.1007/s00284-020-01996-3.

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Lin, Pei, Zheng-Fei Yan, and Chang-Tian Li. "Arthrobacter sedimenti sp. nov., isolated from river sediment in Yuantouzhu park, China." Archives of Microbiology 202, no. 9 (2020): 2551–56. http://dx.doi.org/10.1007/s00203-020-01968-y.

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Polona, Kralj. "Submarine pyroclastic deposits in Tertiary basins, NE Slovenia." Geologija 56, no. 2 (2013): 187–97. http://dx.doi.org/10.5474/geologija.2013.012.

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Ismaeil, Mohamed, Naoko Yoshida, and Arata Katayama. "Bacteroides sedimenti sp. nov., isolated from a chloroethenes-dechlorinating consortium enriched from river sediment." Journal of Microbiology 56, no. 9 (2018): 619–27. http://dx.doi.org/10.1007/s12275-018-8187-z.

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Dissertations / Theses on the topic "Sedimenti"

1

Chiapponi, Emilia. "Caratterizzazione dei sedimenti del fiume Tevere." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Il contesto in cui è stata sviluppata la tesi è la caratterizzazione geochimica dei sedimenti al fine di sviluppare cartografia geochimica regionale. In particolare, è stato analizzato il sedimento fluviale del bacino del fiume Tevere. È stata fatta inizialmente un’analisi dell’area di studio, così da poter progettare in maniera efficace la campagna di campionamento. Lo studio preliminare è stato fatto in base alle informazioni ottenute dalla ricerca bibliografica, e dall’elaborazione dei dati forniti dal Geoportale Nazionale ed elaborati tramite software opensource QGIS. La fase di campionamento ha visto il prelievo di 82 campioni distribuiti oltre che lungo l’asta principale. Il sedimento prelevato è stato analizzato tramite fluorescenza a raggi X (XRF). Al fine di interpolare i dati ottenuti con elementi cartografici, questi sono stati prima processati tramite analisi delle componenti principali (PCA), in maniera tale da individuare le variabili più caratterizzanti il sistema in analisi. Su queste è stato sviluppato il processo di cartografia. L'indagine è stata svolta particolarmente su Pb, Ni, Cr, Cu, AS, Zn di cui è stata prodotta la cartografia. Gli elementi cartografici così sviluppati hanno permesso di inquadrare i risultati ottenuti nella struttura eterogenea dell’area di studio, spiegandone la variabilità spaziale, e riuscendo a motivare l’origine di casi anomali particolari riuscendo a mettere in evidenza condizioni distinte di contaminazione antropica o di origine naturale dell'elemento. Questo ha permesso di mettere in luce il ruolo chiave che la cartografia geochimica ricopre ai fini della pianificazione territoriale, e nella gestione e monitoraggio delle situazioni di contaminazione.
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Bigliardi, Luca. "Composizione dei sedimenti moderni Kongsfjorden, Isole Svalbard." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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This thesis was developed to provide a preliminary analysis of the sedimentary sequence (NYA11_09) in order to discriminate the major ecosystem changes that have occurred in Kongsfjorden over the last ca. 250 years. The main objectives of this thesis were: - to assess the elemental composition of a sediment core collected from the inner part of a fjord in the Svalbard Islands; - to identify the main factors that have regulated the input of detrital and biogenic material to the sampling area. In order to achieve these objectives, the analysis of the main components was carried out using an XRF core scanned Avaatech III° generation, to evaluate the compositional variability of the elements along the entire core. The profiles of selected elemental ratios were discussed. The sedimentary sequence was divided into three sectors (R1-2-3); through the Ti/Ca, Fe/Ca and K/Ca ratios, the detrital input trend was determined, and by using the Ba/Al, Ca/Al and Br/Cl ratios, the biogenic input trend was assessed. The results have shown a greater compositional variability in sector R2, presumably associated with a phase characterized by significant hydrological and climatic changes that consequently affected the composition, flows towards the bottom sediment, and debris inputs. This interval corresponds to an age between 1830 and 1940. Sector R1, from ca. 1940 to the most recent era (modern age) has shown less variability and the changes recorded in both marine circulation and erosion, transport and deposition of sediments of both detrital and biogenic origin are mainly due to climate change since 1950. Sector R3, from ca. the late 1700 to the 1840, seems to record the Little Ice Age.
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Civitelli, Rosaria. "Caratterizzazione dei sedimenti fluviali della pianura Padana." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/2980/.

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Nel presente studio sono state eseguite analisi chimiche su sedimenti fluviali, prelevati in 233 siti rappresentativi, fra i corsi d'acqua che attraversano la pianura Padana. L'obbiettivo dello studio era di caratterizzare il sedimento e determinarne il suo stato di qualità. Parallelamente è stata effettuata, un'indagine sulle comunità di macroinvertebrati, fra alcuni degli affluenti di sinistra del Po e sul Po stesso. I sedimenti sono stati analizzati con uno spettrofotometro a fluorescenza a raggi x (XRF). I risultati ottenuti, durante le analisi e le elaborazioni cartografiche eseguite, vengono riportati e discussi in questo documento. Le analisi chimiche indicano che la composizione del sedimento è caratteristica secondo la sua provenienza ed è determinata dalla litologia dell'area che i fiumi attraversano. Sono state riscontrate particolari anomalie, delle concentrazioni di alcuni elementi potenzialmente tossici, a valle dei centri urbani. Lo studio delle comunità di macroinvertebrati concorda con i risultati ottenuti attraverso le analisi chimiche.
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Mucciacito, Concetta. "Caratterizzazione geochimica dei sedimenti nel sito Caretti di Ferrara." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7873/.

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Lo studio riguarda la caratterizzazione geochimica dei sedimenti del sito Caretti, situato a est del comune di Ferrara, interessato da un forte caso di contaminazione dovuto alla presenza di due discariche municipali non controllate risalenti agli anni '60-'70. L'obiettivo del lavoro è quello di valutare la geochimica dei sedimenti e delle acque prelevate nel sito al fine di individuare eventuali relazioni tra il chimismo delle due matrici. Inoltre, i dati dell' analisi dei sedimenti sono stati confrontati con quelli di letteratura per delinearne aspetti di provenienza. I dati geochimici dei sedimenti sono stati ottenuti mediante fluorescenza a raggi X (XRF) e sono stati elaborati graficamente e statisticamente, mediante software di analisi statistica (GCDkit). La composizione geochimica delle acque è stata ottenuta mediante tecniche di cromatografia ionica e spettroscopia di assorbimento atomico. La geochimica dei sedimenti ha evidenziato che la composizione chimica mostra associazioni di elementi legate a una componente tessiturale del sedimento. In particolare si rilevano concentrazioni elevate di Fe2O3, Al2O3, TiO2, Cr, Ni, e V in sedimenti a granulometria fine, a differenza delle concentrazioni di SiO2 e Na2O elevate in sedimenti sabbiosi. La distribuzione statistica degli elementi nei sedimenti e nelle acque ha permesso di effettuare una valutazione delle caratteristiche geochimiche dei principali corpi idrogeologici. La caratterizzazione geochimica ha fornito, inoltre, indicazioni sull'origine dei sedimenti. Cromo e Nichel, tra gli elementi in traccia, sono particolarmente efficaci nella valutazione della provenienza permettendo, all'interno del sito Caretti, una distinzione tra popolazioni di provenienza appenninica (bassi valori Cr-Ni) e padana (alti valori Cr-Ni).
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Manzotti, Elisa. "Caratteri geochimici dei sedimenti al largo della costa marchigiana." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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La Geochimica riveste un ruolo fondamentale nella descrizione di ambienti deposizionali complessi, come il fondale marino Adriatico. Obiettivo di questo studio è quello di caratterizzare dal punto di vista geochimico i sedimenti superficiali raccolti durante la campagna CAME1 (CNR-ISMAR) svoltasi al largo della costa marchigiana nel tratto Ancona-Civitanova Marche fino alla profondità di ~75m. Al campionamento, effettuato con box-corer su un reticolo di 51 stazioni, sono seguite le analisi geochimiche XRF e la valutazione di LOI, C e N. I risultati ottenuti sono stati sottoposti ad Analisi Fattoriale Q-Mode per indagare le relazioni significative tra elementi maggiori, minori e in traccia ed i principali parametri biochimici. Dallo studio statistico sono emersi tre fattori, che contribuiscono alla composizione dei sedimenti nell’area e sono indicativi dei fenomeni che li generano. La componente argillosa (F1) comprende elementi rappresentativi dei minerali argillosi, metalli associati e materia organica ed è caratterizzata da sedimenti fini trasportati in Adriatico sia dai fiumi appenninici sia da quelli settentrionali, poi ridistribuiti dall’’idrodinamica costiera in una fascia al largo parallela alla costa. La componente carbonatica e residuale (F2), associata a elementi tipici dei carbonati e della frazione minerale pesante, rappresenta i sedimenti grossolani trasportati dai fiumi locali e depositati vicino alla costa. La componente silicatica e residuale (F3) forma una zona di transizione tra le due precedenti ed è contraddistinta da sedimenti siltosi silicatici ed elementi caratteristici della frazione pesante. La distribuzione areale dei fattori permette di delimitare geograficamente cinque zone eterogenee, in cui la diversa provenienza dei sedimenti si riflette sulla composizione geochimica e sui processi di sedimentazione. Sono inoltre presenti due anomalie puntuali a causa dell’influenza diretta del porto di Ancona e di dragaggi storici dello stesso.
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Marcato, Silvestre. "Speciazione del cromo nei sedimenti di una laguna costiera." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3225/.

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Il presente lavoro di tesi ha affrontato le problematiche legate alla speciazione del cromo in particolare i rischi legati alla forma esavalente che risulta particolarmente tossica per gli organismi acquatici. Sono state svolte diverse prove per la messa appunto di una metodica standar dell’US EPA “Method 3060A” indicata per l’estrazione selettiva del Cr(VI) in campioni di sedimento e suolo. Un set di campioni provenienti da sedimenti della laguna costiera della Pialassa della Baiona sono stati analizzati per quantificare i livelli cromo environmentally available, previa dissoluzione in acqua regia, e livelli di cromo esavalente per valutare l’eventuale rischio per il biota acquatico. Sia i livelli di concentrazione di cromo environmentally available confrontati con le linee guida internazionali che i livelli di cromo e Cr(VI) paragonati ai livelli di effetto ritrovati in letteratura non mostrano un potenziale rischio per gli organismi bentonici. I bassi valori di cromo esavalente sono in accordo con le condizioni riducenti tipiche di ambienti di transizione come quello di studio dove la forma chimica del cromo predominante sembra essere quella trivalente. La metodica seguita per la determinazione del cromo esavalente ha diversi limiti rappresentati dall’azione di interferenti quali AVS, Fe(II) e materia organica naturalmente presenti nei sedimenti, per questo procede ancora la ricerca di analisi di speciazione più selettive.
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FELICI, MIRKO. "Aspetti geotecnici connessi con la gestione dei sedimenti marini." Doctoral thesis, Università Politecnica delle Marche, 2018. http://hdl.handle.net/11566/255589.

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Il dragaggio dei sedimenti marini è un tema di carattere multidisciplinare di interesse ambientale in quanto coinvolge grandi quantità di materiale che, talvolta, possono presentare un elevato grado di contaminazione. Alla luce dei recenti sviluppi normativi, in funzione del materiale da asportare, è necessario selezionare le tecnologie di dragaggio in grado di garantire il minimo rischio di contaminazione degli ambienti circostanti durante tutte le fasi del processo di rimozione, trasporto e ricollocamento del materiale. Nel presente elaborato, tali problematiche sono state approfondite nell’ambito del riempimento di una vasca di colmata con sedimenti marini dragati, la quale costituirà l’ampliamento dell’attuale piazzale per lo stoccaggio dei container nel Porto di Ancona. Date le scadenti caratteristiche meccaniche dei sedimenti dopo il loro conferimento, sono stati previsti interventi di consolidamento per rendere l’area adatta alla destinazione d’uso prevista. L’intervento consisterà nell’installazione di un sistema di dreni prefabbricati verticali e nella successiva applicazione di un precarico mediante un rilevato di terreno. Allo scopo di progettare l’intervento di consolidamento è stata eseguita una sperimentazione di laboratorio sui materiali attualmente già conferiti all’interno della vasca. In particolare, sono state eseguite prove di sedimentazione e di compressione edometrica su campioni ricostituiti di sedimenti dai risultati delle quali sono state determinate le leggi di variazione della compressibilità (e-σ’) e della permeabilità (e-k) in funzione dello stato di addensamento, durante i processi di consolidazione. Le leggi di compressibilità determinate sono risultate in accordo con quanto riportato nella letteratura di settore. La legge k-e è stata validata con prove di permeabilità diretta in consolidometro; i risultati osservati sono sovrapponibili a quelli ottenuti con le prove edometriche per indici dei vuoti compresi fra 1,0 e 1,6.<br>Dredging of marine sediment is an issue of environmental interest because of the large volume of materials involved, that often resulting with high level of contamination. With respect to recent regulatory developments, the dredging technologies has to be chosen in order to minimise contamination risks for surrounding areas during dredging, transport and replacement of sediments. In the dissertation these matters have been developed as part of a filling work of a confined disposal facility (CDF) built at the port of Ancona to dispose both uncontaminated and contaminated dredged sediments from nearby ports. The land reclamation will be used mainly as a storage area. Since dredged sediments have typically very high void ratios after disposal and sedimentation, their consolidation is essential in order to achieve proper mechanical characteristics. The CDF has been designed to be divided in sectors for progressively filling. Thereafter prefabricated vertical drains will be installed and the sediments will be preloaded by embankments. In the meantime, analysis of sedimentation and consolidation processes have been planned and investigated by laboratory testing to be analysed by the Gibson large strain consolidation theory. Determination of e-σ’ and e-k laws is necessary to solve the Gibson equation and to correctly evaluate the consolidation phenomena. Results from oedometer and sedimentation tests have been used to determine the compressibility curve (e-σ’) at low and medium stress levels and modelled according to the correlation by Liu and Znidarcic (1991). The resulting law is consistent with literature. Hydraulic conductivity, k, was calculated from oedometer test results and the correlation by Krizek and Somogyi (1984) was used for e-k law determination. Hydraulic conductivity was also measured at several void ratio with consolidometer tests for comparison. The preliminary results show a good agreement for void ratios in range of 1,0 – 1,6.
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Guglielmi, Marco. "Indagini multidisciplinari per la caratterizzazione di sedimenti di mare profondo." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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La tesi è incentrata sull'analisi di una carota prelevata nel mar Ionio al fine di evidenziare eventuali strutture legate al vulcanesimo di fango. La carota è stata prelevata nell'ambito della campagna SEISMOFAULTS 2017 condotta da CNR-ISMAR e IGAG con INGV. Sono descritte le diverse analisi di laboratorio condotte sulla carota, principalmente di tipo sedimentologico, fisico (suscettività magnetica) e geofisico (analisi di profili sismici). Il confronto incrociato dei dati ottenuti sperimentalmente ha fornito informazioni riguardanti la natura delle strutture osservate nella carota e nei dati bati-morfologici.
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Mazzeo, Andrea. "Analisi chimica di sedimenti di mare profondo del SE Tirreno." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10585/.

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In questo studio sono stati analizzati 11 campioni provenienti dalla zona vulcanica dell’arco Eoliano, gentilmente concessi da ISMAR-CNR Bologna. Lo scopo del lavoro è stato quello di ricercare arricchimenti di alcuni elementi critici, di grande importanza economica e a rischio di approvvigionamento. Lo scopo principale è verificare se la zona può contenere possibili risorse minerarie. La composizione degli elementi maggiori e in traccia dei campioni è stata ottenuta tramite XRF. I campioni analizzati, sono stati aggregati ad altri campioni del Tirreno meridionale (oggetto di altre tesi), ottenendo un database di 71 campioni. Questo set esteso di dati è stato utilizzato per costruire grafici composizionali e sono state evidenziate possibili relazioni tra gli elementi maggiori e una selezione di elementi in traccia. Dai grafici, è risultato che la maggior parte degli elementi in traccia presenta una relazione positiva con Si, Ti, Al, Fe e K, ad indicare che gli apporti detritici continentali costituiscono un fattore di arricchimento di elementi critici. Tutti gli elementi hanno una correlazione negativa con il Ca, indicando che carbonati o sedimenti ricchi in Ca non costituiscono un target per la ricerca di elementi critici. Le concentrazioni sono state confrontate con un valore di cut-off per giacimenti impoveriti. Dal confronto, l’unico elemento la cui soglia di cut-off viene superata in tutti i campioni, è il manganese (Mn). Elementi come ferro (Fe), uranio (U), vanadio (V) e scandio (Sc), presentano picchi di concentrazione in alcuni campioni, la cui popolazione è limitata a poco più di due o tre elementi provenienti dalla zona del Bacino di Paola. Pertanto non sono da considerare una possibile risorsa e possiamo quindi concludere che il Mn costituisce l’unica risorsa mineraria “valida” nella zona.
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Zannin, Carlo <1990&gt. "I saggi con microalghe nella valutazione ecotossicologica di sedimenti lagunari." Master's Degree Thesis, Università Ca' Foscari Venezia, 2016. http://hdl.handle.net/10579/7658.

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Gli ecosistemi di transizione sono caratterizzati da un valore di profondità media limitato e di conseguenza, si contraddistinguono per un alto rapporto tra la superficie del fondale e il volume d’acqua soprastante. I processi che avvengono all’interno della colonna d’acqua e all’interfaccia acqua-sedimento sono fortemente influenzati dalla qualità del sedimento. Lo scopo di questo studio, in generale, è quello di valutare la capacità del saggio di tossicità con la specie Phaeodactylum tricornutum (ISO 10253:2006), nel discriminare diversi gradi di contaminazione dei sedimenti lagunari. In aggiunta, è stata valutata la capacità del test di differenziare effetti di tossicità da quelli di biostimolazione. P.tricornutum è un’alga marina bentonica, appartenente al gruppo delle Pennales (diatomee pennate), con un’ampio areale di distribuzione nelle acque marine, marino-costiere e di transizione. Fondamentale per il successo ecologico di P.tricornutum è la capacità di crescere in un ampio intervallo di luce e temperatura. Il campionamento del sedimento operato da terzi ha avuto luogo nel bacino centrale della Laguna di Venezia, nella zona industriale di Porto-Marghera, storicamente molto impattata dalle attività del petrolchimico. Le carote di sedimento sono state processate al fine di ricavare elutriati (1:4 e 1:20) ed acque interstiziali su cui sono state eseguite le analisi. I risultati del test ecotossicologico sono stati espressi come Unità di Tossicità (TU) e di Biostimolazione (BU) e come percentuale di effetto (PE). Questi sono poi stati integrati con i risultati delle analisi chimico-fisiche sui fattori di confusione quali ammoniaca e solfuri. I risultati conclusivi hanno messo in luce una prevalenza di effetti di biostimolazione rispetto a quelli d’inibizione della crescita. All’interno del progetto indagato è stato possibile riconoscere la presenza di alcuni hot spot.
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Books on the topic "Sedimenti"

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Angelucci, Diego E. Elementi di geoarcheologia: Minerali, sedimenti, suoli. Carocci editore, 2022.

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Bencini, Alberto. Fiume Arno: Acque, sedimenti e biosfera. L.S. Olschki, 1993.

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Kranjc, Andrej. Recent fluvial cave sediments, their origin and role in speleogenesis =: Recentni fluvialni jamski sedimenti, njihovo nastajanje in vloga v speleogenezi. Slovenska akademija znanosti in umetnosti, 1989.

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Hay, Bernward J. Particle flux in the western Black Sea in the present and over the last 5000 years: Temporal variability, sources, transport mechanisms. Woods Hole Oceanographic Institution, 1987.

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Drake, Thomas G. Compilation of suspended-load point-transport theories. U.S. Army Engineer Waterways Experiment Station, 1995.

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Bedard, D. Laboratory sediment bioassay report on Wheatly Harbour sediments, 1992. Ministry of Environment and Energy, 1995.

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Rose, William J. Sediment transport, particle size, and loads in North Fish Creek in Bayfield County, Wisconsin, water years 1990-91. U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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Partheniades, Emmanuel. Cohesive sediments in open channels: Properties, transport, and applications. Butterworth-Heinemann, 2009.

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Banasik, Kazimierz. Model sedymentogramu wezbrania opadowego w małej zlewni rolniczej. Wydawn. SGGW, 1994.

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Burkham, D. E. An approach for appraising the accuracy of suspended-sediment data. U.S. G.P.O., 1985.

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Book chapters on the topic "Sedimenti"

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Pikelj, Kristina, and Nina Furčić. "Impact of cliff erosion on marine sediment composition - indication of local coastline evolution (Vrgada Island, Croatia)." In Proceedings e report. Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-147-1.46.

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Erosive coastal cliffs formed in soft-rocks sediments along the generally carbonaceous Eastern Adriatic are a rare feature. The one from the Vrgada Island gave rise to the idea that local seabed surface sediment may reflect the composition of the cliff sediment. First results of sedimentological analyses showed that sediment samples collected on both sides of the cliff contain material eroded mostly from the eastern side of the cliff. Subsequent longshore drift caused by dominant waves likely sort fallen material, transporting its finer fractions to the northern side and further into the sea.
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Banihabib, Mohammad Ebrahim, and Mitra Tanhapour. "Determining the Precipitation Intensity Threshold of Debris Flood Occurrence." In Natural Disaster Science and Mitigation Engineering: DPRI reports. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2904-4_19.

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AbstractIn this chapter, the precipitation threshold at which debris floods occur was evaluated experimentally, and the factors that influence debris flood occurrence, including the bed slope, sediment layer thickness, sediment grain size, length of alluvial flow direction, precipitation intensity, and time of debris flood occurrence, were examined. The impacts of these factors on debris flood initiation were investigated through dimensional analysis. Then, a method was developed to estimate the precipitation intensity threshold based on a set of laboratory tests. Furthermore, different methods for determining the precipitation intensity threshold at which debris floods are initiated were assessed and discussed. The results of the experiments showed that the effect of the sediment layer thickness on debris flood occurrence can be ignored. Moreover, by independently evaluating the effect of each factor on debris flood occurrence, it was found that the sediment length and average diameter of sediments are influential to debris flood initiation. The results of this research provide a better understanding of debris flood mechanisms and occurrence thresholds of debris floods and can be employed to prepare a forecasting model.
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Holzbecher, Ekkehard, and Ahmed Hadidi. "Sediment Transport in Shallow Waters as a Multiphysics Approach." In Natural Disaster Science and Mitigation Engineering: DPRI reports. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2904-4_16.

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AbstractSuspended particle and bed-load transport are usually high during flooding events. For that reason, sediment transport is an important feature to be taken into account when studying floods. Measures that aim to mitigate the negative impacts of floods depend on such studies. Sediment transport phenomena are complex due to their coupling behavior with fluid flow. Due to the erosion and sedimentation of particulate matter, the ground surface changes during the passing of a flood. The courses of unregulated rivers and wadis after floods are different than those before floods. Flowing water transports sediments, and vice versa; sediment redistribution affects the flow of water due to changes in the ground surface and other factors. Computer simulations of sediment transport must take the coupling between water flow and transport processes into account. Here, a multiphysics approach in such a coupled model is presented. Shallow water equations (SWE) representing water height and velocity are coupled with equations for suspended particulate matter and bed loads. Using COMSOL Multiphysics software, an implementation is presented that demonstrates the capability and feasibility of the proposed approach. The approach is applied to the problems of scouring and sedimentation at obstacles, which are particularly important for ensuring the stability of bridges across rivers and wadis.
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Kawamura, Kiichiro, Kazumasa Oguri, Mutsuo Inoue, Kan-Hsi Hsiung, Taishi Kudaka, and Ken Takai. "Ongoing Persistent Slope Failures at the Toe of a Giant Submarine Slide in the Ryukyu Trench that Generated the AD 1771 Meiwa Tsunami." In Progress in Landslide Research and Technology, Volume 1 Issue 2, 2022. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18471-0_5.

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AbstractThis study investigates sedimentation processes and associated submarine sliding on the floor of the Ryukyu Trench. Three dive surveys were conducted using the manned submersible Shinkai 6500 (hereafter 6K) in the trench. The AD 1771 Meiwa tsunami was generated by a giant submarine slide on the landward trench slope in this region. Dive survey site 6K#1469 was located on a mouth of the submarine canyon in the forearc basin. Dive survey site 6K#1468 was located on the uppermost part of the submarine slide, where steps and fissures were observed. Dive survey site 6K#1467 was located at the toe of the submarine slide, which is covered by a muddy sediment layer. Core sample 6K#1467 measured 36.3 cm long and comprised muddy sediments interlayered with silt and/or sand laminations. The paleocurrent direction of the laminated sediments is mostly from north to south, indicating that they were not transported along with the trench but were from the landward slope, probably via repeated small submarine slides. The sedimentation rate for sample 6K#1467 was estimated at 2.42 mm/year using a depth profile of 210Pbex concentration within 10 cm deep and a date for the sediment of ~ 50 year ago. Based on the sedimentation rate and the number of laminae, the typical recurrence interval of the silt/sand layers is calculated to be ~ 6 year. We interpret these results as indicating that repeated small submarine slides have occurred persistently (recurrence interval of ~ 6 year) at the toe of the investigated giant submarine slide in the Ryukyu Trench over the last 50 year.
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Hornung, Jens. "Submersible ground penetrating radar (SGPR) – chances and limits for underwater investigations." In Advances in On- and Offshore Archaeological Prospection. Universitätsverlag Kiel | Kiel University Publishing, 2023. http://dx.doi.org/10.38072/978-3-928794-83-1/p3.

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Results of submerged ground penetrating radar (SGPR) measurements show spectacular detailed depositional structures of lake floor sediments, which could not be revealed with any other geophysical method yet. Due to its very high resolution, GPR is particularly suitable for archeological prospection on land surfaces and now on lake floors. A case study showed that a submerged archaeological site in Lake Constance (boulder mounds, the so-called “Hügelis”) is interfingering with the sedimentary record. Depositional history reveals that the site must be human-made and dates back to the prehistorical period. 14C ages of sediment and wood poles proved Neolithic age of the more than 170 boulder mounds comprising over 80,000 metric tons of rock.
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Van Weering, Tjeerd C. E. "Recent Sediments and Sediment Transport in the Northern North Sea: Surface Sediments of the Skagerrak." In Holocene Marine Sedimentation in the North Sea Basin. Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444303759.ch25.

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Huggett, Richard John. "Sediments." In Climate, Earth Processes and Earth History. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76268-0_4.

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Dalezios, Nicolas R., Saeid Eslamian, Kaveh Ostad-Ali-Askari, Shahab Rabbani, and Ali Saeidi-Rizi. "Sediments." In Selective Neck Dissection for Oral Cancer. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_254-1.

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Bauer, Andreas, and Bruce D. Velde. "Sediments." In Geochemistry at the Earth’s Surface. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-31359-2_6.

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Effler, Steven W., Martin T. Auer, Ned Johnson, Michael Penn, and H. Chandler Rowell. "Sediments." In Springer Series on Environmental Management. Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-2318-4_8.

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Conference papers on the topic "Sedimenti"

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Mohr, Henning, Scott Draper, and David White. "Free Field Sediment Mobility on Australia’s North West Shelf." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11490.

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Under cyclonic conditions, sediment on the North West Shelf (NWS) of Australia may become mobile in shallow water due to classical sediment transport or local liquefaction, and this can affect, for example, the on-bottom stability of subsea pipelines. In this paper, three calcareous sediments sampled from the NWS are analysed, together with realistic metocean data, to illustrate this potential for sediment mobility on the NWS. Specifically, experiments are performed in a recirculating flume (known as an O-Tube) to measure the erosional behaviour and an additional series of experiments are performed using a shaking table, on which each of the sediments have been liquefied and excess pore pressure measurements recorded to back calculate the consolidation coefficient. Soil characterisation data, threshold velocity measurements and shaking table results have then combined to illustrate the potential for sediment mobility for each of the NWS sediments. Best practice models are used to calculate wave and current combined shear stress at the seabed and excess pore pressure accumulation. We find that for these sediments, freshly deposited in laboratory samples, mobility due to sediment transport or liquefaction is very likely in cyclonic conditions on the NWS. Liquefaction is most likely for loosely packed silt, whilst sediment transport is most likely for sand. However, we also show that in more extreme cyclonic conditions there are a subset of sediments that can become mobile due to both sediment transport and liquefaction.
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Catianis, Irina, Adriana Maria Constantinescu, Dan-Lucian Vasiliu, Bogdan-Adrian Ispas, and Dumitru Grosu. "PHYSICAL AND CHEMICAL CHARACTERISTICS OF TATARU AND MERHEI LACUSTRINE SEDIMENTS, FROM THE DANUBE DELTA, ROMANIA." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/5.1/s20.042.

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The quality and quantity of delta lakes� sediment depend on fluvial input and in-situ bio-geo-chemical processes. The present study investigates the quality of lacustrine sediments collected from two lakes - Tataru and Merhei, situated in different hydrodynamic environments within the Danube Delta, Romania, but both connected to fluvial input of water and sediment of the Danube. The following physical and chemical analyses have been carried out on several lake-bottom sediment samples: the main lithological components (total organic matter-TOM%, total carbonates-CAR% and siliciclastic fraction-SIL%), particle size analysis and technophilic element contents. The lithological analysis reveals a considerable variation related to the TOM%, CAR% and SIL% fractions. From this perspective, the investigated lacustrine sediments are generally characterized as organic-rich sediments (endogenous input). The grain size analysis shows the predominance of sandy silt sediments in both lakes. The data regarding the content of technophilic elements in the bed-sediment samples is given in comparison with their natural geochemical background reference value and their acceptable limits provided by the national reference standard. The general characterization of the investigated sediments reveals slight differences among the two investigated lakes in terms of the sediment input from the Danube River. The acquired results contribute to improve the knowledge about physical and chemical characteristics of lacustrine sediments and to plan management strategies of the deltaic lakes for future conservation perspectives, considering the great international importance of the Danube Delta Biosphere Reserve.
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Zhang, Ning, Anpeng He, Jeff Corbino, Paul Schroeder, and Johnathan Bolton. "The Impacts of Confined Disposal Facilities on Calcasieu Ship Channel Sedimentation." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16160.

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The confined disposal facilities (CDFs) are the areas along Calcasieu Ship Channel to store dredged sediments from the ship channel. As the sediments settle in the CDFs, the low concentration sediment flows are discharged into the open water adjacent to the CDFs. The paper demonstrates flow and sediment transport characteristics in the open water due to the CDF discharge. The sediment distributions in all three dimensions in the water are revealed. The lake current effects were also investigated. A commercial CFD package ANSYS-FLUENT is used to simulate all cases in this study.
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Vrålstad, Torbjørn, Ragnhild Skorpa, and Arild Saasen. "Rheological Properties of Barite Sediments in Water-Based Drilling Fluids." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78695.

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When a drilling fluid column remains static over a timeframe of several years, the drilling fluid separates into different sediment phases due to gravity separation. These heavy sediments, entitled “settled barite”, are the cause of significant operational problems several years after drilling. An important problem caused by settled barite occurs when performing casing cut-and-pull operations during slot recovery and well abandonment: the casing is “stuck” due to the sediments in the annulus outside the casing. The consistency and rheological properties of the sediments determine how easily the casing is removed. In this paper, we report a preliminary study were we have artificially prepared gravity sediment phases for two different types of water-based drilling fluids; one KCl/polymer-based fluid and one bentonite-based fluid. By studying the rheological properties of the obtained sediment phases, we see that there are considerable differences between the sediments for these different drilling fluids.
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Ong, Muk Chen, Lars Erik Holmedal, and Dag Myrhaug. "Numerical Computation of Suspended Sediment Around a Marine Pipeline Close to the Flat Seabed." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49111.

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The purpose of this paper is to investigate suspended sediment transport around a marine pipeline near the seabed by solving the Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with the standard k-ε model. High Reynolds number flow simulations are considered in the present study. The suspended sediments are seeded upstream of the pipeline. Particle trajectories of the suspended sediments downstream of the pipeline have been visualized by using a Lagrangian approach. Effects of the gap (i.e. the normal distance between the pipeline and the seabed) and the sediment weight (i.e. taking into account sediment settling velocity) have been investigated and discussed.
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Chi, Sang-Bum, Wonnyon Kim, Cheong-Kee Park, Chanmin Yoo, Youngtak Ko, and Jai-Woon Moon. "Relationship Between Manganese Nodule Distribution and Deep-Sea Sediment Properties in the Northeastern Pacific." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83773.

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In order to identify a potential relationship between the spatial distribution of Mn-nodule and deep-sea sediment properties in the Clarion-Clipperton fracture zone of the northeastern Pacific, physico-chemical properties of deep-sea sediments and photos of sea-floor are analyzed. In general, sediment types in the area show dramatic changes with latitude. Compared to the middle sector (8–12°N) covered with biogenic siliceous sediments, the northern (16–17°N) and southern (5–6°N) areas are dominated by pelagic red clays and calcareous sediments, respectively. Such a difference in sediment types probably produces regional-scale variations in Mn-nodule occurrence with latitude (5–17°N) along longitude (131.5°W). According to the photographic examination, manganese nodules are well exposed on the sea floor in the latitude of &gt;8°N. In connection with the dominant oceanic environment, such observation indicates that calcareous sediments cover the diagenic nodules due to higher primary productivity and sedimentation rate in the latitude of &lt;8°N. In addition, sediments in the latitude of 8–12°N show relatively high shear strength. Considering the operation of miner and environmental effect, highly consolidated B2 and C1 areas (8–12°N), showing higher nodule contents and relatively lower primary productivity, are the most plausible site for commercial mining.
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Beemer, Ryan D., Alexandre N. Bandini-Maeder, Jeremy Shaw, Ulysse Lebrec, and Mark J. Cassidy. "The Granular Structure of Two Marine Carbonate Sediments." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77087.

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Calcareous sediments are prominent throughout the low-latitudinal offshore environment and have been known to be problematic for offshore foundation systems. These fascinating soils consist largely of the skeletal remains of single-celled marine organisms (plankton and zooplankton) and can be as geologically complex as their onshore siliceous counter parts. To enable an adequate understanding of their characteristics, in particular, their intra-granular micro-structure, it is important that geotechnical engineers do not forget about the multifaceted biological origins of these calcareous sediments and the different geological processes that created them. In this paper, the 3D models of soils grains generated from micro-computed tomography scans, scanning electeron microscope images, and optical microscope images of two calcareous sediments from two different depositional environments are presented and their geotechnical implications discussed. One is a coastal bioclastic sediment from Perth, Western Australia that is geologically similar to carbonate sediments typically used in micro-mechanics and particle crushing studies in the literature. The other is a hemipelagic sediment from a region of the North West Shelf of Australia that has historically been geotechnically problematic for engineers. The results show there is a marked difference between coastal bioclastic and hemipelagic sediments in terms of geological context and the associated particle micro-structures. This brings into question whether a coastal bioclastic calcareous sediment is a good micro-mechanical substitute for a hemipelagic one.
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Abduev, M. A. "ANTHROPOGENIC TRANSFORMATION OF THE STOCK OF WEIGHED WEIGHTS OF THE MOUNTAIN RIVERS OF AZERBAIJAN." In Prirodopol'zovanie i ohrana prirody: Ohrana pamjatnikov prirody, biologicheskogo i landshaftnogo raznoobrazija Tomskogo Priob'ja i drugih regionov Rossii. Izdatel'stvo Tomskogo gosudarstvennogo universiteta, 2020. http://dx.doi.org/10.17223/978-5-94621-954-9-2020-60.

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Based on the data of network hydrometric observations over a multi-year period, the transformation of suspended sediments of mountain rivers of Azerbaijan into the stock has been estimated. To quantify the anthropogenic transformation of suspended sediment runoff, we analyzed the dependences of the average annual flow rates of suspended sediment and water, Rg = f (Qg); It was revealed that in connection with the construction of reservoirs, the natural regime of sediment runoff has radically changed.
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Osadchiev, Alexander, Alexander Osadchiev, Peter Zavialov, Peter Zavialov, Vadim Pelevin, and Vadim Pelevin. "METHOD FOR QUANTIFYING ADVECTION, TURBULENT MIXING, AND GRAVITATIONAL SETTLING OF RIVER-BORNE SUSPENDED SEDIMENTS IN COASTAL AREAS FROM THERMOHALINE AND OPTICAL MEASUREMENTS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b94a309e5c6.22106638.

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This work presents an original method for quantifying advection and turbulent mixing of river-borne suspended sediments. The main idea of the method consists in joint analysis of surface distributions of salinity and sediment concentration in coastal areas influenced by river discharge. Basing on the Lagrangian approach we represent a river plume as a set of individual water particles, which inflow from a river mouth, mix with ambient sea water during their motion within a river plume and finally dissipate. Surface salinity and sediment concentration of a particle provides information about its turbulent mixing with undelaying ambient sea waters and gravitational settling of its sediments respectively during the period from its origin in the river estuary till the moment of measurement. Using these integrated Lagrangian characteristics calculated for the whole study area we reconstruct advection streamlines within the river plume and ratio between turbulent mixing and gravitational settling of river-borne suspended sediments. This method was applied to coastal areas situated in the north-eastern part of the Black Sea and the western part of the Philippine Sea. High resolution thermohaline and sediment concentration data were collected using a pump-through system equipped by a CTD instrument and a turbidity sensor.
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Osadchiev, Alexander, Alexander Osadchiev, Peter Zavialov, Peter Zavialov, Vadim Pelevin, and Vadim Pelevin. "METHOD FOR QUANTIFYING ADVECTION, TURBULENT MIXING, AND GRAVITATIONAL SETTLING OF RIVER-BORNE SUSPENDED SEDIMENTS IN COASTAL AREAS FROM THERMOHALINE AND OPTICAL MEASUREMENTS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b431548658b.

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This work presents an original method for quantifying advection and turbulent mixing of river-borne suspended sediments. The main idea of the method consists in joint analysis of surface distributions of salinity and sediment concentration in coastal areas influenced by river discharge. Basing on the Lagrangian approach we represent a river plume as a set of individual water particles, which inflow from a river mouth, mix with ambient sea water during their motion within a river plume and finally dissipate. Surface salinity and sediment concentration of a particle provides information about its turbulent mixing with undelaying ambient sea waters and gravitational settling of its sediments respectively during the period from its origin in the river estuary till the moment of measurement. Using these integrated Lagrangian characteristics calculated for the whole study area we reconstruct advection streamlines within the river plume and ratio between turbulent mixing and gravitational settling of river-borne suspended sediments. This method was applied to coastal areas situated in the north-eastern part of the Black Sea and the western part of the Philippine Sea. High resolution thermohaline and sediment concentration data were collected using a pump-through system equipped by a CTD instrument and a turbidity sensor.
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Reports on the topic "Sedimenti"

1

Kuehl, Steven A. Extension of Sediment Geochronology to Coarse-Grained Sediments. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada572615.

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Ding, Yan, Sung-Chan Kim, Rusty L. Permenter, Richard B. Styles, and Jeffery A. Gebert. Simulations of Shoreline Changes along the Delaware Coast. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/39559.

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This technical report presents two applications of the GenCade model to simulate long-term shoreline evolution along the Delaware Coast driven by waves, inlet sediment transport, and longshore sediment transport. The simulations also include coastal protection practices such as periodic beach fills, post-storm nourishment, and sand bypassing. Two site-specific GenCade models were developed: one is for the coasts adjacent to the Indian River Inlet (IRI) and another is for Fenwick Island. In the first model, the sediment exchanges among the shoals and bars of the inlet were simulated by the Inlet Reservoir Model (IRM) in the GenCade. An inlet sediment transfer factor (γ) was derived from the IRM to quantify the capability of inlet sediment bypassing, measured by a rate of longshore sediments transferred across an inlet from the updrift side to the downdrift side. The second model for the Fenwick Island coast was validated by simulating an 11-y ear-long shoreline evolution driven by longshore sediment transport and periodic beach fills. Validation of the two models was achieved through evaluating statistical errors of simulations. The effects of the sand bypassing operation across the IRI and the beach fills in Fenwick Island were examined by comparing simulation results with and without those protection practices. Results of the study will benefit planning and management of coastal sediments at the sites.
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Perkey, David W., Anthony M. Priestas, Jeffrey M. Corbino, et al. Sediment Provenance Studies of the Calcasieu Ship Channel, Louisiana : A Synopsis Report. U.S. Army Engineer Research and Development Center, 2022. http://dx.doi.org/10.21079/11681/44905.

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To maintain the navigability of the Calcasieu Ship Channel (CSC), the US Army Corps of Engineers annually dredges millions of cubic yards of sediment from the inland channel. To assess sources of channel shoaling, a previous study examined river and bankline erosion as inputs. Results from that study accounted for approximately 20% of dredged volumes. Through the support of the Regional Sediment Management Program, a follow-up investigation reviewed prior sediment budgets, identified potential missing sediment sources, modeled potential sediment pathways, and utilized geochemical fingerprinting to discern primary shoaling sources to the channel. The missing sediment sources from the original budget include coastally derived sediment from the Gulf of Mexico and terrestrially derived sediment from Lake Calcasieu and surrounding wetlands. Results from geochemical fingerprinting of various potential sediment sources indicate the Calcasieu River and the Gulf of Mexico are primary contributors of sediment to the CSC, and sediments sourced from bankline erosion, Lake Calcasieu bed, and interior wetlands are secondary in nature. These results suggest that engineering solutions to control shoaling in the CSC should be focused on sources originating from the Gulf of Mexico and river headwaters as opposed to Lake Calcasieu, channel banklines, and surrounding wetlands.
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Alokhina, Tetiana, and Vadym Gudzenko. Distribution of radionuclides in modern sediments of the rivers flowing into the Dnieper-Bug Estuary. EDP Sciences, 2021. http://dx.doi.org/10.31812/123456789/4617.

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The article presents the results of large-scale studies of the content and distribution of natural and man-made radionuclides in the sediments of the rivers flowing into the Dnieper-Bug estuary. The article also presents the results of the granulometric analysis of the surveyed water bodies. The data about natural radioactive elements in the sediments rivers flowing into the Dnieper-Bug estuary obtained in this research are demonstrated moderate specific activity, which, however, clearly correlates with the granulometric composition of sediments. The 137Cs determined by us is contained in the sediments of all studied water bodies and the places of it greatest concentration coincide with the areas in which the sediment is represented mainly by the pelitic fraction. The data obtained in this research can serve as a baseline data in natural radionuclides concentration in sediments rivers flowing into the Dnieper-Bug estuary. The obtained data can also be used for further monitoring of the specific activity of man-made radionuclides, in particular 137Cs.
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Brown, Gary L., and Luong Phu V. Investigation of Sources of Sediment Associated with Deposition in the Calcasieu Ship Channel. U.S. Army Engineer Research and Development Center, 2022. http://dx.doi.org/10.21079/11681/44907.

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The Calcasieu Ship Channel (CSC) is a deep-draft federal channel located in southwest Louisiana. It is the channelized lowermost segment of the Calcasieu River, connecting Lake Charles to the Gulf of Mexico. With support from the Regional Sediment Management Program, the US Army Corps of Engineers, New Orleans District, requested that the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, perform an investigation of the potential sources of sediment associated with dredging in the CSC. A previous study had quantified sediment from known sources, indicating that the known sediment sources contribute approximately only 21% of the volume that is regularly dredged from the channel. This technical report details the results of the current study, which employed multiple methods, including numerical analysis, to identify potential additional sources of sediment by first examining the available literature and the modeled energetics and flow pathways, and then estimating the quantities of sediment associated with these identified sources that may be contributing to the shoaling of the CSC. The results of these efforts were used to update the original sediment budget with estimates of the contributions from two additional sources: the erosion of interior wetlands and coastally derived sediments.
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Moore, David, Damarys Acevedo-Acevedo, and Philip Gidley. Application of clean dredged material to facilitate contaminated sediment source control. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45342.

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Navigation channels, turning basins, and other US Army Corps of Engineers (USACE)–managed navigation infrastructure often serve as repositories for contaminated sediment from off-site sources. As much as 10% of the material that USACE dredges on an annual basis is contaminated such that it requires additional and more costly management (for example, rehandling and placement in managed confined disposal facilities). Presence of contaminated sediments constrain potential management options resulting in additional costs and opportunity loss from the inability to beneficially use the material. One potential solution is applying clean dredged material to stabilize and isolate contaminated sediment sources, preventing further transport and introduction to USACE-managed infrastructure. This document summarizes a comprehensive literature review of laboratory and field case studies relevant to using clean dredged material to isolate or stabilize contaminated sediments, focusing on the physical, chemical, and biological parameters critical to establishing its feasibility and long-term effectiveness. Potentially effective engineering control measures were also reviewed where erosion and site hydrodynamics are facilitating the transport of contaminated sediments to USACE-maintained navigation infrastructure. This literature review documents and summarizes those factors considered in establishing feasibility and long-term effectiveness of the approach as well as the applicable engineering tools employed and constraints encountered.
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Berkowitz, Jacob F., Christine M. VanZomeren, Jaybus J. Price, and Anthony M. Priestas. Incorporating Color Change Propensity into Dredged Material Management to Increase Beneficial Use Opportunities. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/39261.

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Dredged materials provide a number of beneficial use opportunities, including beach nourishment, habitat creation and restoration, and other activities. In situ sediment color is important for determining aesthetic and habitat suitability, for beach nourishment, and for other projects. However, dredged materials must meet locally established color compatibility requirements (for example, material cannot be too dark). Often, potential sediment sources are close to meeting specified color thresholds, and previous observations suggest that sediments lighten over time. In response to these observations, this study quantified sediment color change potential in a dredged m aterial management context. Results indicate that dredged material sediment color responded to changes in secondary color components, sediment mixing, and photolytic bleaching improving the sediment color for beneficial use application. Findings allowed for development of a conceptual color change capacity framework and supported development of tools for resource managers to incorporate color change dynamic into planning and operations activities.The following report provides a framework for determining the color change capacity of dredged materials using (1) a comprehensive laboratory approach and (2) a semiquantitative index based on source material and placement location conditions. These tools allow practitioners to incorporate dredged-material color change into resource management decisions, thus increasing beneficial use opportunities.
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8

Jansson, Anna, Arun Heer, Suzana Rice, et al. South Shore of Long Island, New York Regional Sediment Management Investigation : an overview of challenges and opportunities. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/43920.

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The US Army Corps of Engineers (USACE) is conducting the “South Shore of Long Island, New York Regional Sediment Management Investigation” to further understand sediment dynamics and to develop a comprehensive regional sediment management plan for the south shore of Long Island, New York. Regional sediment management is a systems approach using best management practices for more efficient and effective use of sediments in coastal, estuarine, and inland environments. This investigation seeks to characterize sediment movement on the south shore of Long Island as a holistic system across the entire study area. It focuses on the regional system post-Hurricane Sandy (October 2012) as the storm significantly altered the physical landscape with severe shoreline erosion, which resulted in the construction of projects to reduce the risk of future storms and stakeholder priorities with a new emphasis on bay-side sediment dynamics, such as channel shoaling and disappearing wetlands. Despite the fact the storm caused severe erosion, the equilibrium beach profile, depth of closure, and general shoreline orientation seem to be unaffected. Previous studies have characterized sediment movement at specific sections of the south shore, but these data have not been incorporated to create a system-wide perspective. Coordinating sediment management across the six Atlantic Ocean inlets, Great South Bay Channel, Intracoastal Waterway, and coastal storm risk management (CSRM) projects could save the federal government millions of dollars in dredging and sand placement actions. This technical note presents the progress the investigation has made to date and will be followed with a more in-depth technical report titled South Shore of Long Island, New York Regional Sediment Management Investigation: A Post-Hurricane Sandy Shoreline Evaluation, currently in preparation.
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Wilkins, Justin, Andrew McQueen, Joshua LeMonte, and Burton Suedel. Initial survey of microplastics in bottom sediments from United States waterways. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42021.

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Given the reported extent of microplastics in the aquatic environment, environmentally relevant exposure information for sediments dredged by the US Army Corps of Engineers will lend context to the risks posed by this contaminant during dredging. We measured the occurrence, abundance, and polymer composition of microplastics in sediments collected from nine dredged waterways and two non-dredged reference areas. The number of particles in sediment samples ranged from 162 to 6110 particles/kg dry wt., with a mean of 1636 particles/kg dry wt. Fragments were the most prevalent shape observed among the 11 study sites (100% frequency of occurrence), followed by fibers (81%), spheres (75%), foams (38%) and films (34%). Based on analyses of chemical composition of the particles using Fourier transform infrared spectroscopy, polyethylene:propylene was the most common polymer type observed. Consistent with results presented by other investigators microplastic concentrations and polymer types in bottom sediments in this study were also aligned with the most widely used plastics worldwide.
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Piercy, Candice, Brandon Boyd, Emily Russ, and Kyle Runion. Systematic beneficial use of dredged sediments : matching sediment needs with dredging requirements. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45443.

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This technical note (TN) will outline a framework to identify beneficial and cost-effective coastal beneficial use of dredged sediment (BUDS) projects. Creation of a BUDS framework that can be applied at scale will promote sustainable BUDS practices, facilitating the delivery of flood risk management, social, and environmental benefits while still fulfilling the US Army Corps of Engineers (USACE) navigation mission. This proactive forecasting approach uses multi-criteria decision analysis (MCDA) and optimization tools to balance tradeoffs between navigation dredging and BUDS goals over project-scale timespans. The proposed framework utilizes available tools to quantify ecological system evolution and current and future dredging needs to develop a systems-level approach to BUDS. Required data include current and future information on (1) existing and planned natural and created aquatic ecological systems, which may include natural and nature-based features (NNBFs), (2) dredging requirements and costs, and (3) aquatic system physical and environmental data.
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