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Academic literature on the topic 'Dredger'

Author: Grafiati

Published: 4 June 2021

Last updated: 20 February 2023

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Journal articles on the topic "Dredger"

Lyubimov, Victor Ivanovich, Nikolay Frolovich Popov, and Grigory Ivanovich Sapunov. "Review and analysis of operation of best domestic and foreign river dredgers." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 2 (May 22, 2020): 39–53. http://dx.doi.org/10.24143/2073-1574-2020-2-39-53.

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The article analyzes the development and modernization of energy and technological equipment, as well as soil productivity of dredging projects of both foreign and domestic manufacturers of dredging equipment. The emphasis has been placed on the installation and use of submersible pumps. The productivity of soil dredges has been found to increase due to changes in the design of soil sampling devices and soil pumps. The main characteristics of the American river dredgers with hydraulic cultivators and domestic river diesel dredgers with hydraulic soil cultivators have been considered and evaluated. The designs of the dredgers built in France and the Netherlands have been studied. To compare the technical and economic parameters of the standard type Beaver1600 dredger and the 82080-800 m3/h project domestic dredger there were carried out calculations by the specialists of Volzhskiy State University of Water Transport. There has been illustrated the layout of the TRN-3000 dredge pump (France) including a control cabin, a milling cultivator, a frame of a soil intake device, a submersible soil pump, an anchor support, etc.; layout of the KhAM-219 dredger (Netherlands); layout of Ellicott dredger (USA); layout of a domestic 350-50LPG dredger based on class 350-50L dredgers; a suction pump S-55P; layout of the Benoto dredger (France) including a mechanical cultivator, a soil pump, a hydraulic pump of a soil pump, a frame and a hydraulic cylinder for raising and lowering the frame. It has been inferred that the domestic dredgers are not inferior to the foreign models, taking into account that they are equipped with a new type of domestic rotary-bucket cultivator for working on inland waterways of Russia. The financial assessment of the construction of new domestic dredgers has been carried out.

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Qi, Qiang, Feifei Qiao, Wenyuan Wang, Zijian Guo, and Ying Jiang. "A evaluation and selection model of dredger considering marine ecological environment and dredger performance." E3S Web of Conferences 294 (2021): 06001. http://dx.doi.org/10.1051/e3sconf/202129406001.

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There will be total suspended solids in port dredging, which will affect aquatic organisms and water quality. Therefore, with the Green Port becoming the core concept of port development, it is necessary to consider the impact of dredging on marine ecological environment when selecting dredgers. In this paper, the calculation method of biomass loss caused by dredging is proposed, and the biomass loss is taken as the evaluation index to establish a dredger selection model considering marine ecological environment and dredger performance. The dredger selection model uses the fuzzy synthetic evaluation method based on norm grey relational grade to evaluate and select dredgers quantitatively, avoiding the influence of subjective factors on dredger selection. Finally, the feasibility of dredger selection model is verified by a practical dredging engineering and the results indicate that the dredger selection model can serve as a scientific basis for the construction of ecological port and the protection of marine environment.

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Zhuang, Haifei, Mingming Liu, and Yongding Wu. "Study on Impeller Configuration Strategy of Dredger Pump with Different Conveying Distance." Journal of Physics: Conference Series 2329, no. 1 (August 1, 2022): 012019. http://dx.doi.org/10.1088/1742-6596/2329/1/012019.

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Abstract For DN850 dredge pumps of 3,500 m3/h series cutter suction dredger, on the premise of not changing the impeller size, by changing the parameters of impeller blade to reduce the head of dredge pump, special new impellers for inboard pump and submerged pump are designed; The flow field of the dredge pump is analyzed by numerical simulation. There is no vortex in the impeller channel and near volute tongue, which indicates that the hydraulic performance is excellent; At the flow rate of 10,000 m3/h, compared with the original impeller, the head of the two pumps in series with new impellers is reduced by 23 m, and the efficiency is close to that before modification, reaching more than 85%; This paper analyzes the matching between the dredger pump and the pipeline under three kinds of common sandy mud. By comparing the unit power consumption and productivity, it obtains the suitable conveying distance range of special new impellers of dredger pumps, and forms the impeller configuration scheme of 3,500 m3/h series cutter suction dredger with different conveying distance, which provides guidance for dredging engineering.

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Rumyantcev, Ernest G., and Evgeniy P. Ronnov. "DETERMINATION OF ELEMENTS AND CHARACTERISTICS OF RIVER SUCTION DREDGERS AT INITIAL DESIGN STAGES." Russian Journal of Water Transport, no. 62 (March 10, 2020): 71–80. http://dx.doi.org/10.37890/jwt.vi62.50.

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The article provides a methodology for calculating the basic elements and characteristics of river dredgers at the stages of research design by means of the statistical method. For the study, the most common projects of river non-self-propelled dredgers with both a residential superstructure and without it, in a wide range of soil productivity, were used. The dependences of the total displacement and the main engine power on such basic technical data as suction dredger performance and loosening depth were analyzed in detail. Graphic dependencies and analytical expressions for determining the main suction dredger dimensions were obtained. The issue of choosing the length of the main dredger compartments is considered, which allows to solve the problem of pre-splitting the hull into compartments. The analysis of the accuracy of the obtained statistical dependencies for determining the length of the vessel is provided.

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Маmatov, Farmon, Isroil Temirov, Samar Оchilov, Dilsabo Chorieva, Doniyor Rakhmatov, and Gulnoza Murtazaeva. "Substantiation the technology and parameters of the “paraplau” type soil dredger for a two-tier plow." E3S Web of Conferences 304 (2021): 03014. http://dx.doi.org/10.1051/e3sconf/202130403014.

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The purpose of the study was to substantiate the technology and parameters of the “paraplau” type soil dredger for a two-tier plow. The basic principles and methods of classical mechanics, mathematical analysis and statistics were used in this study. Sub-tillage loosening of the most compacted layers of the soil of the fields from under the cotton must be carried out in a strip way along the line of the middle of the irrigation furrows between the rows. It is established that for the implementation of strip loosening of the subarable soil layers of fields from under cotton, the width of the two-tier plow should be a multiple of the width of the row spacing. At the same time, for loosening the compacted subsurface layers of the middle of the row spacing of cotton with one working body, the soil dredgers are installed behind each even lower body in the plane of the field edges of the odd bodies. In the case of subtillage loosening of the middle of the row spacing by two soil dredgers with an inclined stand, one soil dredger is installed behind each lower body. An analytical relationship is obtained to justify the relative position of the plow bodies and the soil dredgers, as well as their parameters. Experimental studies have established that the resistivity of a two-tier plow decreases (in comparison with continuous loosening) when the most compacted layers of the middle of the row are loosened with a pointed paw by 17.56%, two soil dredgers with inclined posts by 24.04%, and one soil dredger with an inclined post by 23.24%.

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Kechkin, Aleksei Olegovich, Aleksandr Sergeevich Plekhov, and Oleg Stanislavovich Khvatov. "Improving efficiency of dredger electric power system." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2022, no. 1 (February 28, 2022): 50–57. http://dx.doi.org/10.24143/2073-1574-2022-1-50-57.

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Most river dredgers are equipped with several electric positioning drives, a soil pump electric drive and a hydraulic washing pump. The listed electric drives are the main consumers of electricity from the dredger diesel generators. It is necessary to change the structure of the ship electric power network in order to reduce fuel consumption by diesel generators. The energy characteristics of the dredger electric drive system with a different configuration of the converter equipment are determined. Simulation models of the dredger DC and AC power systems have been developed. The models were built using MATLAB Simulink software and SimPowerSystem library. Application of simulation models made it possible to assess the efficiency of using a DC bus in the power system of the dredger. The circuits of the dredger electric power system, electric drives of cross-dredging winches are illustrated. The operation modes of electric drives of cross-dredging winches are analyzed. The necessity of analyzing the operation of electric drives and of developing the control signals for the braking resistors of the frequency converter in the power control system is revealed. The parameters of the presented electric drives and their values are considered. The expressions for calculating the total power of the system nodes are given, taking into account the characteristics of the operating modes of the dredger electric drives based on an alternating current network. Using the developed version of the power system contributes to saving capital costs and specific fuel consumption. Modernization of the power system helps reduce the power of diesel generators, increase the efficiency of the system and reduce the power of the ventilation system of compartments with winch frequency converters, due to regenerative braking by the electric drives.

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Chertkov, Alexandr A., Vladimir Yu Ivanyuk, and Yaroslav N. Kask. "MODAL SYNTHESIS OF THE OBSERVER OF THE STATE VARIABLES OF THE RIVER DREDGER AUTOMATION SYSTEM." Vestnik Gosudarstvennogo universiteta morskogo i rechnogo flota imeni admirala S. O. Makarova 14, no. 5 (December 14, 2022): 787–97. http://dx.doi.org/10.21821/2309-5180-2022-14-5-787-797.

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The purpose of the work is to apply automation technologies and digitalization of the process of assessing the immeasurable variables of the state of the river dredger automation system when controlling high-tech software and hardware equipment with an electric drive, in order to increase the productivity of the vessels of the technical fleet when performing dredging operations on waterways. River dredgers are complex dynamic control objects, the performance of which in the conditions of digital transformation can be significantly increased through the use of new software and hardware, the algorithmization of which is based on neural network technologies and learning processes. To increase the efficiency and reliability of the operation of such facilities with the prospect of transition to unmanned control of the energy systems of dredgers, it is necessary to increase the information content of the complex of sensors containing information about the object state. In this regard, the use, along with the existing ones, of mathematical information sensors, which are observers, is proposed in the paper. On the example of controlling a precision electric drive, an algorithm for synthesizing a dynamic system with an observer, in which all components of the state variables vector are restored at the output coordinate, is considered. The proposed algorithm for the synthesis of the state vector evaluator is implemented in the form of a program compiled in the MATLAB codes, and it is demonstrated by the example of calculating a three-dimensional dynamic observer for the automation system of a river dredger. The obtained values of state variables and errors of their recovery, as well as the results of modeling the dynamic reactions of the automation system of the river dredger, correspond to the specified speed and required stability of the electric drive of the river dredger during its transition to a steady state under new initial conditions.

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Vale, Carlos, Ana M. Ferreira, Cristina Micaelo, Miguel Caetano, Eduarda Pereira, Maria J. Madureira, and Elsa Ramalhosa. "Mobility of contaminants in relation to dredging operations in a mesotidal estuary (Tagus estuary, Portugal)." Water Science and Technology 37, no. 6-7 (March 1, 1998): 25–31. http://dx.doi.org/10.2166/wst.1998.0731.

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During the construction of a New Bridge over the Tagus estuary 2.5 million tons of sediments were dredged, part of this quantity being contaminated material. The extension and intensity of the water turbidity associated with dredging operating varied with the tidal conditions but the resuspended material collected near the bucket dredger did not present a concentration increment in metals and PCB, when compared to the estuarine suspended sediments. The calculated distribution coefficients suggest that some contaminants in solids near the dredger were not in equilibrium with the water. A 24-hour laboratory experiment demonstrated the complexity and quickness of anoxic sediments oxidation. In such a short period of time metals in the solids change their fractionation. A second laboratory simulation showed that mussels accumulate metals and PCB congeners when placed in turbid aerated water.

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Firdaus, Aden, Muhammad Rizkiansyah, and Yessi Nirwana. "Analisis Perbandingan Biaya pada Pekerjaan Pengerukan di Alur Pelabuhan Bandar Bakau Jaya Banten." Jurnal Rekayasa Hijau 4, no. 2 (August 7, 2020): 62–71. http://dx.doi.org/10.26760/jrh.v4i2.15-23.

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ABSTRAKPelabuhan Bandar Bakau Jaya yang terletak di Provinsi Banten saat ini dapat melayani kapal yang berjenis 5.000 DWT, dan rencananya akan melayani kapal 10.000 DWT. Pekerjaan pengerukan akan dilakukan pada Alur Pelabuhan dengan dimensi panjang 2.391 m dengan jenis tanah adalah tanah halus berpasir. Tujuan dari penelitian ini adalah membandingkan biaya dan waktu pelaksanaan dari masing- masing jenis kapal keruk yang dapat melakukan pekerjaan pengerukan dengan kondisi tanah yang ada di alur pelabuhan. Metode yang digunakan adalah dengan memperhitungkan berapa lama waktu pekerjaan pengerukan sehingga didapatkan biaya dari masing-masing jenis kapal keruk. Hasil dari analisis didapatkan 3 jenis kapal keruk yaitu, TSHD dalam waktu 2,11 bulan dan biaya Rp27.316.912.819,63, SD dalam waktu 8,34 bulan dan biaya Rp27.887.202.652,35, dan CSD dalam waktu 6,08 bulan dan biaya Rp37.995.671.214,00. Jenis kapal keruk yang paling efisien untuk pekerjaan pengerukan di alur pelabuhan ini adalah TSHD dengan 7 tugboat dan barge.Kata kunci: pengerukan, alur pelayaran, kapal keruk ABSTRACTBandar Bakau Jaya Port, located in Banten Province, currently serves 5,000 DWT vessels, and it is planned to serve 10,000 DWT vessels. Dredging work will be carried out on the Port Channel with a dimension of 2,391 m in length with a fine sandy soil type. The purpose of this study is to compare the cost and implementation time of each type of dredger that can carry out dredging work with existing soil conditions in the port channel. The method used is to calculate how long the dredging work is so that the cost of each type of dredger is obtained. The results of the analysis found 3 types of dredges namely, TSHD in 2.11 months and costs Rp27,316,912,819.63, SD in 8.34 months and costs Rp27,887,202,652.35, and CSD in 6, 08 months and costs Rp37,995,671,214.00. The most efficient type of dredger for this work is TSHD with 7 tugboats and barges.Keywords: dredging, fairway, dredger

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Dissertations / Theses on the topic "Dredger"

Tessler, Thomaz Martino. "Weather downtime analysis for cutter suction dredgers." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-26012017-092026/.

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The dredging activity is increasing worldwide due to ships that require bigger drafts, and consequently deeper navigation channels. Some dredging projects requires the operation of cutter suction dredgers on open waters, once these are capable of removing compact sediments and rocks while still maintaining a good productivity. These facts motivated the creation of a weather driven downtime prediction software for this type of operation, based on simplified calculations of the main dredging systems of a CSD. The motions caused by waves, and the forces and moments caused on these dredgers by winds, waves and currents were analyzed in order to evaluate the influence of each parameter magnitude and direction on the behavior of the vessel. The main criteria of the dredger influenced by this conditions were determined by a literature review as being the swing winch required power, the interaction between the cutterhead and the soil, and the anchoring system resistance, this that can be both a spud pole system stress or the Christmas tree cable tension. In this research, only the spud pole system bending stress was considered. Three mathematical models were developed to represent those systems. Since the non-linearity of the relation between the reaction forces of the dredger and the soil was not an object of the study, this process is represented by a constant user defined reaction force and a horizontal cutterhead velocity model. The efficiency of these models were tested by applying them on a case study of the dredging of the Açu port on the Brazilian coast by the Taurus II dredger. Simultaneous wind, wave and current data data were used as input to these models by creating a time series scenario of the operation period. The results for both scenarios showed that the operation would be close to impossible due to wave generated dynamic stress on the spud pole.
A atividade de dragagem no mundo é cada vez mais significativa em função do aumento dos navios que operam em portos, estes que possuem maior calado e requerem, consequentemente, canais de navegação mais profundos. Alguns projetos de dragagem utilizam dragas de sucção e recalque em mar aberto, dada a capacidade destes equipamentos de remover sedimento compactado e rochas, ainda mantendo uma boa produtividade. Estes fatos motivaram a criação de um programa de previsão de downtime gerado por condições ambientais de dragas de sucção e recalque baseado em modelos matemáticos simplificados. Os movimentos causados por ondas, e as forças e momentos causados na draga por ventos, ondas e correntezas foram analisados de forma a se obter a influência da magnitude e direção de cada um destes parâmetros no comportamento da embarcação. Os principais sistemas da draga influenciados por estas condições foram determinados com base em uma revisão bibliográficas como sendo a potência requerida nos guinchos de varredura, a interação do cortador com o solo e a resistência do sistema de ancoragem, sendo este a tensão de flexão dinâmica na trave do spud ou as tensões de ancoragem pelo sistema de árvore de natal. Três modelos matemáticos foram desenvolvidos para representar estes sistemas. Considerando a não linearidade da interação entre a draga e o solo, este processo foi representado por uma força de reação definida pelo usuário e pela velocidade horizontal do cortador. A eficiência destes modelos foi testada ao aplicá-los em um estudo de caso da dragagem do porto de Açu, na costa brasileira pela draga Taurus II. Valores simultâneos de ondas, ventos e correnteza foram utilizadas como entrada nestes modelos, através da criação de um cenário hipotético de série temporal. Os resultados para ambos os casos demonstraram que a operação seria impossibilitada em função de tensões de flexão dinâmicas no spud maiores que o limite determinado.

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Glover, Gordon Jason. "Laboratory modeling of hydraulic dredges and design of dredge carriage for laboratory facility : a thesis." Thesis, Monterey, California. Naval Postgraduate School, 2002. http://hdl.handle.net/10945/3051.

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The deepening and maintenance of the world's ports and navigable waterways has been an integral part of the world economy for centuries. In recent years, cutterhead and draghead hydraulic suction dredges have performed a majority of the dredging work. The ongoing design and testing of hydraulic dredges is important for maintaining efficient dredging operations within the limits set by increasing environmental regulations. The high cost of building and operating a hydraulic dredge makes field testing of full-scale prototypes very expensive and time consuming. Moreover, the testing conditions are generally difficult to control, and the natural unpredictability of the sea can render experimental results inconclusive. These factors substantiate the need for laboratory model testing of hydraulic dredging operations. The usefulness of any hydraulic model depends on the degree of geometric, kinematic, and dynamic similarity between the model and its prototype. The primary challenge in establishing useful similitude criteria for model dredge studies is proper kinematic scaling of the suction inlet velocity, average particle settling velocity, dredge swing velocity, and cutter rotational speed. Despite the inherent challenges, model studies of hydraulic dredge equipment have proven useful for obtaining qualitative results. The new Coastal Engineering Laboratory at Texas A&M University is equipped with model dredge testing facilities ideal for performing such experiments. The tow/dredge carriage has a fully adjustable dredge ladder, a 14.9 kW (20 hp) cutter drive, and a 2.54 cm (3 in) dredge pump. A Programmable Logic Controller (PLC) provides computer numerical control and real-time data collection and analysis during model dredging operations. The purpose of this thesis is to investigate scaling relationships for hydraulic dredge model studies and to design a model dredge carriage for the new laboratory facilities recently constructed at the Texas A&M University College Station campus. Pursuant to the design of the new dredge modeling facilities, a rationale for scaling the model dredge operating parameters based on previous model studies is put forward. Examples of model studies that could be performed with the proposed facilities are discussed as well as how the scaling methodology is applied to each experiment to allow the quantitative interpretation of experimental data.

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Gurriet, Philippe C. (Philippe Charles). "Geochemistry of Hawaiian dredged lavas." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/54327.

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Bučionis, Edvardas. "Tinkamiausios žemsiurbės ežerams valyti vertinimas, taikant daugiakriterinę analizę." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090603_100222-78128.

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Visų Lietuvoje esančių ežerų valymo darbai, sapropelio kuopimas atliekamas mechaniniu bei hidrauliniu būdais. Pastarasis sapropelio gavybos bei ežero išvalymo būdas paplitęs plačiausiai, nes gamybinės organizacijos dažniausiai naudoja technologiją, kai sapropelis pumpuojamas į specialiai tam paruoštus sėsdintuvus. Sapropelio gavyba bei ežero išvalymas atliekamas žemsiurbės pagalba. Tyrimų tikslas - parinkti geriausią žemsiurbę užpelkėjantiems ežerams valyti. Darbe pateikiama metodika, leidžianti tinkamiausią žemsiurbę išsirinkti pagal penkis kriterijus. Vertintos rusiškos, baltarusiškos, vakarietiškos taip pat anksčiau Lietuvoje naudotos žemsiurbės. Žemsiurbės vertintos daugiakriterinės analizės ELECTRE ir MAUT metodais. Daugiakriterinė analizė atlikta panaudojant programines įrangas HYPSE ir DAM. Už konsultacijas, rengiant, magistrantūros studijų baigiamąjį darbą reiškiu padėką: Doc. dr. A. Ciūniui, lekt. E. Laurinavičiui ir prof. habil. dr. L. Katkevičiui.
The cleaning works of all Lithuanian lakes, excavation of sapropel are carried out either by mechanical or hydraulic means. The latter is the common means of sapropel extraction and lake cleaning. Industrial organizations usually apply technologies so that sapropel is pumped to specially prepared sedimentation tanks. The cleaning of a lake and extraction of sapropel is carried out by the means of a dredger. The aim of the research is to choose the best dredger for the cleaning of swampy lakes. The work discusses methods which allow choosing the best dredger according to five criteria. Russian, Byelorussian, western dredgers and dredgers used in Lithuania earlier have been evaluated following the multi-criteria ELECTRE and MAUT methods. Multi-criteria analysis was carried out using HYPSE and DAM software.

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Kubánek, Jan. "Lanový drapák." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228815.

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When soluting the contruction of a grab dredger we will deal with suitable solution with reference to its using and capacity, possibilites of its setting in low temperatures and incidental aplication of the exchangeable abrasion - resistant mouldings. There will be made a calculation of forces taking effect on a grab dredger and a check calculation of the chosen structural parts.

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Hossain, Abdul Siddik. "Improvement of Dredged Sediments : A laboratory study on dredged sediments with different types of binders." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65019.

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tabilization and solidification (S/S) technique have been the most frequently used method for dredgedsediment improvement in Sweden and worldwide. As dredging activities are essential for safe navigationof ships and vessels that may processes harmful substances or organic pollutants to causecontamination of the surrounding environment. Stabilization/solidification technology has beenidentified as the most beneficial handling strategy for contaminated dredged sediments and treatedstabilized materials can be used in civil engineering applications (e.g. backfill or embankment). This (S/S)technique is the easiest way of improving high water content dredged sediments using different types ofbinders. During the stabilization process, dredged sediments are mixed with commonly used binders,such as Portland cement, fly ash and ground granulated blast furnace slag (Merit 5000). Nowadays,supplementary cementitous materials such as (fly ash and blast furnace slag) are being used increasinglyconsidering long term strength development of stabilized dredged materials instead of using morecement. Generally, cement hydration is a complex chemical-reactions. By addition of supplementarycementitious materials, it becomes more complex because of cement hydration and pozzolanicreactions. The overall objective of this thesis work is to improve the understanding of compressibilityand strength behavior of stabilized dredged materials. To achieve these objectives, a series ofunconfined compressive strength tests and consolidation tests were performed on stabilized dredgedmaterials (SDM) with different types and mixing ratios of binders. These lab tests have been focused onthe compressibility and strength properties of stabilized materials. The UCS test determines the amountof binders and curing time needed to achieve the required shear strength of SDM. The outcomes of thisthesis work show that the stabilized dredged sediments constitute of binder mixing ratio (Cement:Flyash:Merit 5000 as a proportion of 10:10:5) which is 25% of the total fresh dredged sediments can’tsustain any superstructure or surcharge load but it can only be used as backfill materials on site.Whereas, stabilized dredged material with binder mixing ratio (Cement:Fly ash:Merit 5000 as aproportion of 20:20:10) which is 50% of the total fresh dredged Sediment becomes stiff after 28 dayscuring and becomes very stiff after 91 days curing. It becomes obvious that the unconfined compressivestrength of SDM increases with higher amount of binders and longer curing time. The pozzolanicreaction continues after 28 days curing period. The presence of supplementary cementitous materials(fly ash, blast furnace slag and merit 5000) can improve the ductility of stabilized dredged materials(SDM) in the post-peak strength degradation zone without changing the unconfined compressivestrength. It is also obvious from the test results that the UCS values of stabilized dredged materialsincrease with decreasing moisture content/increasing bulk density. The consolidation properties of SDMare greatly influenced by the binder mixing ratio, curing time and preloading weight. Due to preloadingweight, the deformation in stabilized dredge sediments is irreversible because of cementation andpozzolanic effects. Considering both curing time and binder ratio, compression index (Cc) and swellingindex (Cs) values for SDM with binder ratio (20:20:10) have been lowered approximately by 75% and67%, respectively than SDM with binder ratio (10:10:5). After 91 days curing of SDM with binder ratio(20:20:10), the maximum value of tangent modulus is estimated about 9624 kPa which indicates thatthe superstructure can be erected on stabilized dredged materials. It is also concluded that physicochemicalvariables control the consolidation behavior of stabilized dredge materials (SDM) as thecoefficient of consolidation (Cv) value decreases with increasing consolidation pressure.

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Smith, Stanley Jarrell II. "Fine Sediment Dynamics in Dredge Plumes." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539616859.

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The research presented in this study is motivated by the need to improve predictions of transport and fate of cohesive sediments suspended during dredging operations. Two techniques are presented to quantify vertical sediment flux within dredge plumes. A mass-balance approach using an Acoustic Doppler Current Profiler (ADCP) is described and demonstrated to accurately estimate vertical mass flux and settling velocity for a suspension of fine sand from a dredged material placement operation. A new digital video settling column for simultaneous measurement of particle size and settling velocity is described and evaluated. The Particle Imaging Camera System (PICS) is a single-chambered, digital video settling column, which permits rapid acquisition (within 2--3 minutes) of image sequences within dredge plumes. Image analysis methods are presented, which provide improved estimates of particle size, settling velocity, and inferred particle density. A combination of Particle Tracking Velocimetry (PTV) and Particle Image Velocimetry (PIV) techniques is described, which permits general automation of image analysis collected from video settling columns. In the fixed image plane, large particle velocities are determined by PTV and small particle velocities are tracked by PIV and treated as surrogates for fluid velocities. The large-particle settling velocity (relative to the suspending fluid) is determined by the vector difference of the large and small particle settling velocities. The combined PTV/PIV image analysis approach is demonstrated for video settling column data collected within a mechanical dredge plume in Boston Harbor. The automated PTV/PIV approach significantly reduces uncertainties in measured settling velocity and inferred floc density. Size, settling velocities, and density of suspended sediments were measured with PICS within a trailing suction hopper dredge plume in San Francisco Bay. Results indicated that suspended sediments within the plume were predominantly in the clay and fine silt size classes, as aggregates with d>30 microm. Suspended bed aggregates (defined by densities of 1200 to 1800 kg m-3) represented 0.2--0.5 of total suspended mass, and size and settling velocity of this class were time invariant. Flocs (densities<1200 kg m-3) represented 0.5 to 0.8 of total suspended mass, and size and settling velocity of flocs was seen to increase with time. The peak diameter of bed aggregates and flocs occurred near 90 microm and 200 microm, respectively, corresponding to peak settling velocities of about 1 mm s-1 in each case. Floc settling velocities increased with particle size d1.1, while bed aggregate settling velocity increased like d1.3. Numerical modeling approaches to representing settling velocities for hopper dredge plumes are discussed in light of the experimental findings. Size-dependant settling velocities were well-described by a fractal-based relationship when the suspension was treated with discrete classes for each of the aggregate states. Time-dependent increases in floc size and settling velocity confirm that flocculation is a first-order process which should be included in numerical plume models. Correlations between settling velocity and suspended sediment concentration were weak and statistically insignificant, implying that commonly applied empirical relationships are inappropriate for dredge plumes.

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Adair, Robert Fletcher. "Estimating production and cost for clamshell mechanical dredges." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1536.

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Clamshell dredges are used around the United States for both navigational and environmental dredging projects. Clamshell dredges are extremely mobile and can excavate sediment over a wide range of depths. The object of this thesis is to develop a methodology for production and cost estimation for clamshell dredge projects. There are current methods of predicting clamshell dredge production which rely on production curves and constant cycle times. This thesis calculates production estimation by predicting cycle time which is the time required to complete one dredge cycle. By varying the cycle time according to site characteristics production can be predicted. A second important component to predicting clamshell dredge production is bucket fill factor. This is the percent of the bucket that will fill with sediment depending on the type of soil being excavated. Using cycle time as the basis for production calculation a spreadsheet has been created to simplify the calculation of production and project cost. The production calculation also factors in soil type and region of the United States. The spreadsheet is capable of operating with basic site characteristics, or with details about the dredge, bucket size, and region. Once the production is calculated the project cost can be determined. First the project length is found by dividing the total amount of sediment that is to be excavated by the production rate. Once the project length is calculated the remainder of the project cost can be found. The methods discussed in this thesis were used to calculate project cost for 5 different projects. The results were then compared to estimates by the government and the actual cost of the project. The government estimates were an average of 39% higher than the actual project cost. The method discussed in this thesis was only 6% higher than the actual cost.

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Haus, Nicholas Wes. "Beneficial Reuse of Dredged Materials in Upland Environments." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/36317.

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Sediments excavated from dredging operations are known as dredged materials. Beneficial reuse of dredged materials in confined utilization facilities (CUFs) is a new approach that has the potential to productively utilize large quantities of dredged materials. However, several factors can inhibit the use of dredged materials in CUFs. In this study, high levels of salts and polycyclic aromatic hydrocarbons (PAHs) were investigated. In the first part of this study, 176,000 m3 of saline dredged materials was placed into a CUF. In less than 4 years, most of the dredged materials had developed horizonation and converted to Inceptisols. The formation of pedogenic Bg horizons in these soils occurred after a polygonal prism network had developed which partially disintegrated into a blocky structured, oxidized horizon with an abundance of redoximorphic features. During the study period, the soil chemistry of the weathering dredged materials shifted from Na-dominated to Ca and Mg-dominated system, allowing plant invasion. In the second part of the study, a bench-scale greenhouse bioremediation experiment was conducted to test the effectiveness of biosolids, compost, and straw at enhancing PAH degradation. Initial concentrations of PAHs decreased significantly after 150 days using standard methods of extraction. However, at 327 days the concentrations of many PAHs, especially those with higher molecular weights, had rebounded close to initial levels. This indicates that PAH bioremediation studies using organic matter additions and conducted using standard methods of extraction need to be carried out longer periods of time or that extraction methods need to be improved.
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de, Ruyter Marcus J. M. "Two-dimensional cut plan optimization for cutter suction dredgers." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/79367/.

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Optimal cut plans for cutter suction dredgers aim to maximize operational efficiency. Maximizing operational efficiency involves minimization of stoppage time resulting from non-productive dredger movements. To automate a systematic search for optimal twodimensional cut plans for cutter suction dredgers two models with an adaptive simulated annealing-based solution approach were developed. The first model, the dredge cut nesting model, optimizes irregular stock cutting problems where stencils represent dredge cuts and sheets represent dredging areas. Stencils are collections of unit dredge cuts with dimensions related to an effective cutting width which can be achieved with the cutter suction dredger considered. The objectives of the dredge cut nesting model are to maximize sheet coverage and to minimize stencil overlap. Centroids of unit dredge cuts of final nest layouts are extracted and used as grid nodes in the second model. The second model, the dredger routing model, optimizes asymmetric travelling salesperson problems with turning costs. The objectives of the dredger routing model are to minimize total route length and sum of turning angles, and to maximize average link length. A link consists of two or more route edges which are aligned with each other to within specified limits. A significant result of this research is that an engineering application of both models showed that two-dimensional cut plans for cutter suction dredgers can be systematically optimized and that dredger routes with minimum turning costs can be found. However, results also showed that the dredger routing model is not yet sophisticated enough to find cut plans for cutter suction dredgers for which overall project execution time is minimal.

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Books on the topic "Dredger"

The dream dredger: A novel. New York: Persea Books, 1986.

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Branch, Great Britain Marine Accident Investigation. Report of the Chief Inspector of Marine Accidents into the collision between the passenger launch Marchioness and MV Bowbelle with loss of life on the River Thames on 20 August 1989. London: H.M.S.O., 1991.

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Dumbauld, Brett R. Mitigation for estimated juvenile Dungeness crab loss due to test of hopper dredging with sidecast disposal in Willapa Bay, Washington: Final report, June 10, 1998. Olympia, WA: Washington Dept. of Fish and Wildlife, Fish Program, Willapa Bay Field Station, 1999.

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Great Britain. Marine Accident Investigation Branch. Report of the Chief Inspectorof Marine Accidents into the loss of the suction dredger Bowsprite: With four lives, in the North Sea on 5 December 1988. London: H.M.S.O., 1991.

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A, Vlasov A. Tekhnicheskai͡a︡ ėkspluatat͡s︡ii͡a︡ dnouglubitelʹnogo flota. 3rd ed. Moskva: "Transport", 1986.

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Ogorodnikov, S. P. Gidromekhanizat͡s︡ii͡a︡ razrabotki gruntov. Moskva: Stroĭizdat, 1986.

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Turner, Thomas M. Fundamentals of hydraulic dredging. 2nd ed. New York, N.Y: ASCE Press, 1996.

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Whiteaves, Joseph Frederick. On recent deep sea dredging operations in the Gulf of St. Lawrence. [S.l: s.n., 1987.

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Book chapters on the topic "Dredger"

Yu-hua, Zhang, and Jiang Jian-guo. "Dynamic Positioning Control System of the Dredger." In Electrical, Information Engineering and Mechatronics 2011, 1489–95. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2467-2_177.

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Zhang, Yinfeng, Zhen Su, and Jingqi Fu. "Variable Selection Methods in Dredger Production Model." In Intelligent Computing and Internet of Things, 155–65. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2384-3_15.

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Zhen, Su, Diandian Cao, and Sun Jian. "Modeling and Simulation of Draghead on Trailing Suction Hopper Dredger." In Lecture Notes in Electrical Engineering, 755–64. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3187-8_71.

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de Jong, Christ A. F., Michael A. Ainslie, Floor Heinis, and Jeroen Janmaat. "Offshore Dredger Sounds: Source Levels, Sound Maps, and Risk Assessment." In The Effects of Noise on Aquatic Life II, 189–96. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2981-8_22.

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Yan, X. P., Y. H. Chen, A. N. Li, and C. Q. Yuan. "Study of Tribological Faults and Their Prevention Approaches in Dredger." In Advanced Tribology, 961–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03653-8_326.

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Guo, Xing, Yichao Mao, and Kai Kang. "Dynamic Simulation Research on Hydraulic System of Backhoe Dredger Excavator." In Human Centered Computing, 757–64. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15554-8_66.

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Su, Zhen, and Wei Yuan. "Parameter Estimation of Trailing Suction Hopper Dredger Dredging Model by GA." In Lecture Notes in Electrical Engineering, 811–15. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0539-8_80.

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Yuan, Xiao-qing, Man-lei Wang, Huan Yan, Jun-qi Chen, and Bao-ming Tan. "3D Visualization Study on Microstructure Variation of Dredger Fill by Step Vacuum Preloading." In Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours, 226–36. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0125-4_25.

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Ren, F. F., Q. Xu, C. Xu, X. H. Xu, and H. Z. Wang. "Numerical Study on the Full-Range Consolidation Characteristics of a New Dredger Fill Foundation." In Springer Geology, 83–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31671-5_13.

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Sun, Hui, Jiaming Qu, Ran Tao, Qinze Chen, and Yuchi Hao. "Experiment and Simulation of Mobile Underwater Dredger Fill in- Layers Technology in Open Water." In Sustainable Development of Water and Environment, 357–70. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07500-1_32.

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Conference papers on the topic "Dredger"

Xu, Xiaojian, Xinping Yan, Chenxing Sheng, and Xincong Zhou. "Improving Reliability of Mechanical Equipment in Dredgers Based on Wear Control Methods." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42418.

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As the main equipment of channel and port construction, the reliability of dredgers has a significant effect on providing the frequent and regular maintenance for the marine transport systems. However, the dredger is prone to damage extremely especially the wear fault due to its complex structure with various mechanical equipment and harsh working environment such as the silt-carrying conditions. In this paper, the tribological systems of dredgers were analyzed in detail based on AHP and based on the analysis, the framework of wear control methods for dredgers was proposed. A series of wear control methods were taken including online wear condition monitoring and wear self-repairing to ensure the reliable operation of the dredger. The effects of the wear control measures for dredgers were evaluated and it proved that all the measures taken in this paper are effective to improve the reliability of the mechanical equipment in dredgers.

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Sarkar, Sritama, Neil Bose, and Mridul Sarkar. "Measurement Techniques for Full Scale Test of a Submersible Walking Dredger/ Miner." In SNAME 27th American Towing Tank Conference. SNAME, 2004. http://dx.doi.org/10.5957/attc-2004-015.

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The use of surface floating dredgers in deep inland reservoirs, shelf areas and tidal inlets is limited by several operational restrictions and mobilization problems. Deployment of small, modular, autonomous to semi-autonomous submersible dredgers/ miners in these areas is expected to reduce the operational and mobilization constraints. Most of the existing submersible dredgers/ miners use tracks for locomotion on submerged ground. Legged locomotion is however favored in these natural unstructured terrains. A small, modular, walking submersible dredger/ miner is designed and a prototype is under construction. Prediction of the major design parameters of such a system requires a mathematical model integrating the processes of excavation, transportation of the excavated material and locomotion of the vehicle while moving on submerged ground. This paper gives a brief overview of the full scale tests to be performed with the prototype for validation of part of the mathematical model.

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Sarkar, Mridul K., Neil Bose, Shuhong Chai, and Kim Dowling. "Conceptual Design of a Submersible Remotely Operated Swimming Dredger (SROSD)." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49868.

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Increasing use of deep-water dredging and mining vehicles has been anticipated for resource collection, engineering construction and environmental protection. Existing deep-dredging or mining equipment can be classified as i) diver-assisted dredging tools, ii) surface-floating dredgers with deep-dredging capability and iii) submersible dredgers. Diver assisted dredging tools have limited capacity and involve human risk. Surface floating dredgers can work to a specific dredging depth controlled by their ladder length, but modification is limited by their large size and significant cost. Submersible dredgers are deployed for sub-sea operations and are the focus of this research. Submersible crawlers and walkers work in a submerged terrain-contact condition and depend on their apparent weight and ground reactions to counteract the excavation forces. Crawlers are inefficient in negotiating difficult sub-sea terrain and walking submersibles are slow moving over long-distances. Considering the constraints of dredging depth, negotiation of uneven terrain, slow motion, interchange ability of excavation or transport sub-system components and station keeping during operation, a new type of submersible dredger or miner was conceived. In working mode, it imitates a walking motion by spuds that are also used for station keeping during dredging. For longdistance travel, the vehicle can swim by means of vector thrusters. The vector thrusters also help in position-keeping and motion-control during swimming. To offset higher forces generated during excavation of hard materials, spuds, variable buoyancy tanks and control planes are included as secondary station-keeping devices. The paper describes the general arrangement and the distinguished sub-systems of the conceptualised vehicle. Special attention was given to working and swimming locomotion and the methods of station keeping during operation. Investigations about the station-keeping, propulsion and controlling conditions of the vehicle are in progress. Experiments to measure the cutting forces from the cutter design are described. It is expected that the new design will significantly contribute to the evolution of existing deep-dredging equipment with improved efficiency, increased mobility and location control while minimising larger environmental disturbances.

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Ogasawara, Tamotsu, Tamiya Fukushima, Masahide Murase, and Yuzuru Nakamura. "Development of Advanced Dredger." In 13th International Symposium on Automation and Robotics in Construction. International Association for Automation and Robotics in Construction (IAARC), 1996. http://dx.doi.org/10.22260/isarc1996/0045.

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van Duursen, Ewout, and Mark Winkelman. "New Approach of Deep Sea Dredging." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49351.

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A new approach of trailing suction dredging is presented. This approach is especially useful for dredging at depths over 100m. Normally a Jumbo Trailing Suction Hopper Dredger is used for dredging at depths of over 100m. This requires a large investment. The expensive dredging equipment is only used while dredging. This equipment is mainly “dead cargo” when sailing to the place of delivering the sand. Our new approach requires a significant lower investment. As the dredging equipment is used continuously, idle time is decreased and time for return of investment is shortened. The dredging depth is independent of the length of the trailing suction pipe and thus the length of the ship, unlike a normal Trailing Suction Hopper Dredger. Our approach consists of modular dredging equipment placed on e.g. a standard Platform Supply Vessel. By using the dredging equipment on this vessel, standard barges are continuously filled with sand. The dredging equipment consists of a submersible dredging unit connected to a hose. This dredging unit is suspended by wires from the Platform Supply Vessel. It is lowered to the required dredging depth by winches. The application of the dredging unit is like a normal Trailing Suction Hopper Dredger. The barges are loaded while sailing along the Platform Supply Vessel. The position of the dredging unit is constantly monitored. An extensive research project is initiated to develop this concept. Several scale model tests are performed at MARIN. Also a numerical model was designed. Extensive tests were performed on the hose. Another test was performed at TU Delft to investigate the transport of sand/water mixture through a hose stored on a reel. All this research has resulted in a reliable, inexpensive system to dredge at sea at great depths over 100m.

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Digitemie, I. E., and A. V. Ioppa. "Mini suction dredger for SAND." In 2008 International Conference Modern Technique and Technologies - (MTT 2008). IEEE, 2008. http://dx.doi.org/10.1109/spcmtt.2008.4897494.

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Jal, E. N., C. M. Holland, M. Twigt, and V. Haag. "Fire Risk Analysis of a Cutter Suction Dredger." In International Conference on Fire at Sea 2014. RINA, 2014. http://dx.doi.org/10.3940/rina.fire.2014.05.

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Mamunts, D., S. Sokolov, A. Nyrkov, T. Storchak, and I. Li. "The effect of dredger positioning accuracy on the environment." In 2016 IEEE NW Russia Young Researchers in Electrical and Electronic Engineering Conference (EIConRusNW). IEEE, 2016. http://dx.doi.org/10.1109/eiconrusnw.2016.7448215.

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Fu-sheng, Ni, Zhao Li-juan, Gu Lei, Jiang Shuang, Qian Li-na, Xu Li-qun, He Kun-jin, Liu Rui-xiang, and Zhou Quan-sheng. "Simulation of dredging processes of a cutter suction dredger." In 2010 International Conference on Audio, Language and Image Processing (ICALIP). IEEE, 2010. http://dx.doi.org/10.1109/icalip.2010.5685039.

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Ye, Yongqiang, Ming Bai, Zhenxian Zhang, Weicheng Qiu, and Rui Li. "The dredger cutter motion control system based on ADRC technology." In 2016 12th World Congress on Intelligent Control and Automation (WCICA). IEEE, 2016. http://dx.doi.org/10.1109/wcica.2016.7578436.

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Reports on the topic "Dredger"

Gailani, Joseph, Burton Suedel, Andrew McQueen, Timothy Lauth, Ursula Scheiblechner, and Robert Toegel. Supporting bank and near-bank stabilization and habitat using dredged sediment : documenting best practices. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/44946.

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In-water beneficial use of dredged sediment provides the US Army Corps of Engineers (USACE) the opportunity to increase beneficial use while controlling costs. Beneficial use projects in riverine environments include bank and near-bank placement, where sediments can protect against bank erosion and support habitat diversity. While bank and near-bank placement of navigation dredged sediment to support river-bank stabilization and habitat is currently practiced, documented examples are sparse. Documenting successful projects can support advancing the practice across USACE. In addition, documentation identifies data gaps required to develop engineering and ecosystem restoration guidance using navigation-dredged sediment. This report documents five USACE and international case studies that successfully applied these practices: Ephemeral Island Creation on the Upper Mississippi River; Gravel Island Creation on the Danube River; Gravel Bar Creation on the Tombigbee River; Wetland Habitat Restoration on the Sacramento-San Joaquin River Delta; and Island and Wetland Creation on the Lower Columbia River Estuary. Increased bank and near-bank placement can have multiple benefits, including reduced dredge volumes that would otherwise increase as banks erode, improved sustainable dredged sediment management strategies, expanded ecosystem restoration opportunities, and improved flood risk management. Data collected from site monitoring can be applied to support development of USACE engineering and ecosystem restoration guidance.

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Fall, Kelsey, David Perkey, Zachary Tyler, and Timothy Welp. Field measurement and monitoring of hydrodynamic and suspended sediment within the Seven Mile Island Innovation Laboratory, New Jersey. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40980.

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The Seven Mile Island Innovation Laboratory (SMIIL) was launched in 2019 to evaluate beneficial use of dredge material management practices in coastal New Jersey. As part of that effort, the Philadelphia District requested that the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, collect data to characterize the hydrodynamics and turbidity within the central portions of the SMIIL prior to and during dredge material placement. Pre-dredge monitoring found that apart from punctuated wind events, the study area waters were generally calm and clear with small waves, <0.25 m, slow current speeds (~0.1 m/s), low turbidity (~10 ntus), and low suspended sediment concentrations (~10–20 mg/L). In March 2020, 2,475 m³ of dredged sediment was placed on the northern portion of Sturgeon Island within the SMIIL. Turbidity in the waters surrounding the island was monitored to quantify extent of the sediment plume resulting from the placement. Observations found little to no turbidity plume associated with the dredging operations beyond 20 m from the island and that the plume was largely limited to areas near a tidal creek draining the placement area. Additionally, turbidity levels quickly returned to background conditions at times when the dredge was not in operation.

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Zarillo, Gary, Sara Ramos, Kristopher Effinger, Kristen Becker, Irene Watts, Katherine Brutsché, Brian McFall, and Douglas Krafft. Evaluating cross-shore sediment grain size distribution, sediment transport, and morphological evolution of a nearshore berm at Fort Myers Beach, Florida. Engineer Research and Development Center (U.S.), March 2022. http://dx.doi.org/10.21079/11681/43780.

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Navigation channels are periodically dredged to maintain safe depths. Dredged sediment was historically placed in upland management areas or in offshore disposal areas. Florida state law prohibits placement of beach fill sediment that contains more than 10% by weight of silt and clay, which is typically a characteristic of dredged material. An alternative is placement in a nearshore berm. Some potential benefits of nearshore berms include wave energy dissipation, reduced cost of dredging and shore protection, and possible onshore movement of the berm material. This study considers sediment distribution, morphological evolution, sediment transport, and shoreline trends along Fort Myers Beach, Florida, related to the nearshore berm constructed in August 2016. Due to timing of the field study, this report also includes information on the influence of a major hurricane that impacted the area. The overall conclusion of this study is that the dredge-sourced sediment in the berm performed as expected. Within 2 years, the berm adjusted to the shoreface environment, maintained a large part of its original volume, and contributed to protection of the beach and shoreline. The impact of Hurricane Irma included a shift in sediment textures and a large but temporary increase in shoreface sediment volumes.

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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.), September 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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Ruffman, A., and J. E. van Hinte. Devonian Shelf - Depth Limestone Dredged From Orphan Knoll: a 1971 Discovery and a Reassessment of the Hudson 78-020 Dredge Hauls From Orphan Knoll. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/130698.

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Rosati, James, and Timothy Welp. Case Studies: Monitoring Pipeline Dredges. Fort Belvoir, VA: Defense Technical Information Center, July 1999. http://dx.doi.org/10.21236/ada367406.

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WASHINGTON STATE DEPT OF ECOLOGY OLYMPIA. Puget Sound Dredged Disposal Analysis: Management Plan Assessment Report. Dredged Material Management Year 1990. Fort Belvoir, VA: Defense Technical Information Center, March 1991. http://dx.doi.org/10.21236/ada235108.

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Stark, Timothy, Abedalqader Idries, Lucia Moya, and Abdolrzea Osouli. Beneficial Use of Dredged Material from the Illinois Marine Transportation System. Illinois Center for Transportation, November 2022. http://dx.doi.org/10.36501/0197-9191/22-022.

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This project presents several successful case studies in 15 categories of dredged material along with the statutory and regulatory requirements for beneficial use of dredged material in Illinois. The Illinois Environmental Protection Agency classification criteria for contaminated and uncontaminated dredged material are included with emphasis on Illinois requirements and characterization. Nine sites that have sandy dredged material stockpiles in Illinois are presented with suggestions for beneficially using the material. Based on this study, there is a high potential for beneficially using dredged material in Illinois for a range of projects. Currently, it is a state policy in Illinois to formally evaluate the history of possible nearby sources of chemicals that may have impacted the project sediments and to test the dredged material for chemical contamination before accepting for use on any highway project. However, the research team suggest that if the dredged material is mainly uncontaminated sand (e.g., greater than 80% sand) and is from a local site that does not have a history of contamination as determined by a formal evaluation, then the material is unlikely to be contaminated and may be easier to use and require little to no contaminate testing. Nevertheless, this proposed rule needs more testing and examination to be verified.

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Perkey, David W., Anthony M. Priestas, Jeffrey M. Corbino, Gary L. Brown, Michael A. Hartman, Danielle R. N. Tarpley, and Loung Phu V. Sediment Provenance Studies of the Calcasieu Ship Channel, Louisiana : A Synopsis Report. U.S. Army Engineer Research and Development Center, July 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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JEPSEN, RICHARD A., JESSE D. ROBERTS, AMY L. LUCERO, and CHAPIN JR.,D. MICHAEL. Canaveral ODMDS Dredged Material Erosion Rate Analysis. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/786627.

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