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Journal articles on the topic 'Estuary-coast gradient'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Yao, Ru, LiNa Cai, JianQiang Liu, and MinRui Zhou. "GF-1 Satellite Observations of Suspended Sediment Injection of Yellow River Estuary, China." Remote Sensing 12, no. 19 (2020): 3126. http://dx.doi.org/10.3390/rs12193126.

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We analyzed the distribution of suspended sediments concentration (SSC) in the Yellow River Estuary based on data from GaoFen-1 (GF-1), which is a high-resolution satellite carrying a wide field-of-view (WFV) sensor and panchromatic and a multispectral (PMS) sensor on it. A new SSC retrieval model for the wide field-of-view sensor (M-WFV) was established based on the relationship between in-situ SSC and the reflectance in blue and near infrared bands. SSC obtained from 16 WFV1 images were analyzed in the Yellow River Estuary. The results show that (1) SSC in the study area is mainly 100–3500 m

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Ramos, S., C. B. Paris, and M. M. Angélico. "Larval fish dispersal along an estuarine–ocean gradient." Canadian Journal of Fisheries and Aquatic Sciences 74, no. 9 (2017): 1462–73. http://dx.doi.org/10.1139/cjfas-2016-0325.

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The present study investigated the larval fish dispersal along an estuarine–ocean gradient to explore connectivity between ocean and estuaries. During spring 2009, a combined ocean–estuarine survey was conducted along the Lima estuarine salinity gradient and in two transects off the adjacent coast (northwestern Iberian Peninsula), until the 100 m isobaths. Salinity, total particulate matter, particulate organic matter, total dissolved carbon, and dissolved organic carbon reached higher values at the ocean, and chlorophyll a and nutrients increased at the estuary. From the total 56 taxa identif

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Huang, Ju, Rui Yuan, and Jianrong Zhu. "Numerical Simulation and Analysis of Water and Suspended Sediment Transport in Hangzhou Bay, China." Journal of Marine Science and Engineering 10, no. 9 (2022): 1248. http://dx.doi.org/10.3390/jmse10091248.

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Hangzhou Bay is a large, high-turbidity shallow bay located on the southern side of the Changjiang Estuary, China. The process and dynamic mechanisms of water and sediment transport in the bay are not yet clear. An improved three-dimensional sediment numerical model that combined various dynamic factors was established to simulate and analyze these mechanisms. The residual current cannot properly represent the net water and sediment transport, and the residual unit width water flux (RUWF) and residual unit width sediment flux (RUSF) were used to explain the water and sediment transport. The re

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Miyata, Ryuhei, Reiko Akiyama, Takehito Horie, Yasuhito Noshi, and Kei Iguchi. "THE CASE OF SEDIMENT OUTFLOW FROM MOUNTAIN TO THE COAST DUE TO SMALL AND MEDIUM-SIZE FLOODS." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 64. http://dx.doi.org/10.9753/icce.v37.sediment.64.

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Smaller rivers in Japan can be characterized as having short distances from the mountainous areas of the source of sediment production to the estuary and steep slopes. Therefore, sediment produced from the mountains and river channels at the time of flooding immediately contributes significantly to the sediment dynamics at the estuary and coast in a short period of time. On the other hand, there have been few observations or studies that have measured the volume of landslides and riverbed fluctuations in the mountains in the entire basin before and after the occurrence of flooding, and quantit

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Montagna, Paul. "How a Simple Question About Freshwater Inflow to Estuaries Shaped a Career." Gulf and Caribbean Research 32 (2021): ii—xiv. http://dx.doi.org/10.18785/gcr.3201.04.

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Chance and good luck led to a career studying how freshwater inflow drives estuary processes. In 1986, someone asked me: How much fresh water has to flow to a bay for it to be healthy? The question shaped my career. There is probably no better place on Earth to compare effects caused by inflow differences than the Texas coast, because the major estuarine systems lie in a climatic gradient where runoff decreases 56—fold from the Louisiana border in the northeast to the Mexico border in the southwest. This estuary—comparison experiment was used to study inflow effects. The science evolved from t

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de Carvalho, Fabrício Lopes, and Erminda da Conceição Guerreiro Couto. "Environmental variables influencing the Callinectes (Crustacea: Brachyura: Portunidae) species distribution in a tropical estuary—Cachoeira River (Bahia, Brazil)." Journal of the Marine Biological Association of the United Kingdom 91, no. 4 (2010): 793–800. http://dx.doi.org/10.1017/s0025315410001700.

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The genus Callinectes comprises seven species of blue crab found on the Brazilian coast, almost all are recorded in Cachoeira River estuary. The objective of this study is to analyse distribution of Callinectes species in the estuary of Cachoeira River (Ilhéus, Bahia). Monthly collections were conducted in the low tide of neap tide for a year and in five stations distributed according to the estuary salinity gradient. Six traps were assembled and submerged at each station for two hours. Sediment samples were collected for granulometric characterization and measuring of organic matter content.

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Moura, Victor Lacerda, and Luiz Drude de Lacerda. "Mercury Sources, Emissions, Distribution and Bioavailability along an Estuarine Gradient under Semiarid Conditions in Northeast Brazil." International Journal of Environmental Research and Public Health 19, no. 24 (2022): 17092. http://dx.doi.org/10.3390/ijerph192417092.

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In the semiarid coast of northeast Brazil, climate change and changes in land use in drainage basins affect river hydrodynamics and hydrochemistry, modifying the estuarine environment and its biogeochemistry and increasing the mobilization of mercury (Hg). This is particularly relevant to the largest semiarid-encroached basin of the region, the Jaguaribe River. Major Hg sources to the Jaguaribe estuary are solid waste disposal, sewage and shrimp farming, the latter emitting effluents directly into the estuary. Total annual emission reaches 300 kg. In that estuary, the distribution of Hg in sed

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Cavalcante, Geórgenes H., David A. Feary, and Björn Kjerfve. "Effects of Tidal Range Variability and Local Morphology on Hydrodynamic Behavior and Salinity Structure in the Caeté River Estuary, North Brazil." International Journal of Oceanography 2013 (September 8, 2013): 1–10. http://dx.doi.org/10.1155/2013/315328.

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Tidal influence and local morphology on circulation and salt transport are investigated in the Caeté river estuary, a well-mixed estuary along the north coast of Brazil. Velocity, temperature, and salinity data were collected in three different locations along the estuary’s main channel, over three single, 13 h tidal cycles. The aim of this study was to investigate the relationship between tidal distortion and salinity by using classical methods of comparison of three cross-channel circulation characteristics, as well as computation of salt flux and vertical mixing. Findings indicate a flood-e

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9

Van de Broek, Marijn, Stijn Temmerman, Roel Merckx, and Gerard Govers. "Controls on soil organic carbon stocks in tidal marshes along an estuarine salinity gradient." Biogeosciences 13, no. 24 (2016): 6611–24. http://dx.doi.org/10.5194/bg-13-6611-2016.

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Abstract. Tidal marshes are sedimentary environments and are among the most productive ecosystems on Earth. As a consequence they have the potential to reduce atmospheric greenhouse gas concentrations by sequestering organic carbon (OC). In the past decades, most research on soil organic carbon (SOC) storage in marsh environments has focused on salt marshes, leaving carbon dynamics in brackish and freshwater marshes largely understudied and neglecting the diversity among tidal marshes. We therefore conducted an extensive sampling campaign to quantify and characterize SOC stock in marshes along

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Nyakeya, Kobingi, James Onchieku, Frank Masese, Zipporah Gichana, Albert Getabu, and Jane Nyamora. "Trends in Water Quality in a Tropical Kenyan River-estuary System: Responses to Anthropogenic Activities." Asian Journal of Biology 20, no. 6 (2024): 34–51. http://dx.doi.org/10.9734/ajob/2024/v20i6413.

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Aims: To determine the spatial variation in physico-chemical water quality attributes in estuarine ecosystems of South Coast Kenya to inform its management. Study Design: We employed diagnostic research design where such factors as anthropogenic activities, hydrology, and accessibility were considered in choosing 12 sampling stations. A mixed sampling design (probability and non-probability) was used to sample. Place and Duration of Study: Four discharging rivers into estuarine system with a reference point were identified. 12 sampling points were earmarked and sampled for 12 months. Methodolo

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Niveditha, S. Krishna, C. K. Haridevi, Revati Hardikar, and Anirudh Ram. "Phytoplankton assemblage and chlorophyll a along the salinity gradient in a hypoxic eutrophic tropical estuary-Ulhas Estuary, West Coast of India." Marine Pollution Bulletin 180 (July 2022): 113719. http://dx.doi.org/10.1016/j.marpolbul.2022.113719.

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12

Lopes, Rubens M. "Hydrography and zooplankton community structure: a comparative study among estuaries of the Jureia-Itatins Ecological Station (southeastern Brazil)." Revista Nerítica 10, no. 1-2 (2022): 27–40. http://dx.doi.org/10.5380/rn.v10i1-2.85101.

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The spatial distribution of zooplankton and hydrographical variables was investigated in the larger river estuaries of the Jureia-Itatins Ecological Station and compared through multivariate analysis. The distribution of most abiotic and biotic descriptors paralleled the salinity gradient, which explained a high percentage of the observed variance. The low-salinity stretches of clearwater rivers presented low phosphorus and nitrogen but comparatively high silicate concentrations, the opposite occurring in equivalent areas of blackwater rivers. Distinct zooplanktonic associations occurred in ea

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13

Harrison, S. J. "Climatic conditions over the estuary and Firth of Forth, Scotland." Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 93, no. 3-4 (1987): 245–58. http://dx.doi.org/10.1017/s0269727000006710.

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SynopsisThe pattern of climatic variation over estuaries and their environs is, to a considerable extent, controlled by aspect, slope and elevation in addition to orientation of the major relief features with respect to the movement of principal weather systems. Data from the few climatological stations within the immediate vicinity of the estuary and Firth of Forth demonstrate the essentially maritime nature of climate, and indicate also that there is a dominantly west–east gradient of change in most climatological variables. Below the high water mark the movement of water in tidal ebb and fl

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Cordovil, Gleydson, and Mauricio Camargo. "ANÁLISE POPULACIONAL DO PEIXE–ESPADA, Trichirus lepturus (PERCIFORMES;TRICHIURIDAE), NO ESTUÁRIO DO RIO CAETÉ, COSTA NORTE DO BRASIL." Scientific Magazine UAKARI 3, no. 1 (2008): 104–8. http://dx.doi.org/10.31420/uakari.v3i1.24.

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This study describes frequency distribution of the total length and estimates the weight-length relation of Trichiurus lepturus in the estuary of the Caeté River, northeastern Brazil. These population parameters were compared among four areas along the latitudinal gradient of the South American coast. Samples were gathered in the estuarine area of the Caeté River from October 1996 to August 1997. The total length of T. lepturus at the River varied between 27-81 cm, with a mode at 57 cm. No significant differences were detected among the four stocks. Different stock responses to environmental f

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15

Malamud-Roam, Frances, та B. Lynn Ingram. "Late Holocene δ13C and pollen records of paleosalinity from tidal marshes in the San Francisco Bay estuary, California". Quaternary Research 62, № 2 (2004): 134–45. http://dx.doi.org/10.1016/j.yqres.2004.02.011.

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Records of stable carbon isotopes (δ13C) are presented from cores collected from four San Francisco Bay marshes and used as a proxy for changes in estuary salinity. The δ13C value of organic marsh sediments are a reflection of the relative proportion of C3 vs. C4 plants occupying the surface, and can thus be used as a proxy for vegetation change on the marsh surface. The four marshes included in this study are located along a natural salinity gradient that exists in the San Francisco Bay, and records of vegetation change at all four sites can be used to infer changes in overall estuary paleosa

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16

Tuchkovenko, Yu S., D. V. Kushnir, A. V. Torgonskyi, and V. M. Komorin. "The impact of the destruction of the Kakhovka reservoir dam on the oceanographic conditions in the north-western part of the Black Sea according to the results of modeling." Ukrainian hydrometeorological journal, no. 33 (September 15, 2024): 66–80. http://dx.doi.org/10.31481/uhmj.33.2024.05.

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Based on the results of numerical modelling, characteristic features of distribution of transformed and polluted waters of the Dnieper River in the water area of the north-western part of the Black Sea (NWBS) are determined and analyzed. This pollution of the marine environment resulted from the extremely large man-made flood caused by the destruction of the Kakhovka Reservoir dam by the Russian occupation forces in June 2023. Various types of pollutants, which contained in the Kakhovka Reservoir, in the lower Dnieper River and in the bottom sediments, were carried out into the sea by the floo

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17

Goñi-Urriza, MS, D. Point, D. Amouroux, et al. "Bacterial community structure along the Adour estuary (French Atlantic coast): influence of salinity gradient versus metal contamination." Aquatic Microbial Ecology 49 (October 16, 2007): 47–56. http://dx.doi.org/10.3354/ame01128.

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18

Valério-Berardo, M. T., M. N. Flynn, L. M. R. Rodrígues, and F. S. Attollini. "SEASONAL COMPOSITION AND SPATIAL DISTRIBUTION OF MACROBENTHIC ASSOCIATIONS ALONG AN ESTUARINE GRADIENT IN ITANHAÉM, SÃO PAULO, BRAZIL." CICIMAR Oceánides 21, no. 1-2 (2006): 1. http://dx.doi.org/10.37543/oceanides.v21i1-2.24.

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Macrobenthos distribution along the salinity gradient and the pattern of species temporal changes were investigated in the Itanhaém River Estuary. Environmental variables such as grain size, sediment organic content, water salinity, water temperature and dissolved oxygen were examined as factors likely to influence the distribution of species. A total of 2130 individuals, distributed in 16 taxa (species/genera) were collected from the 12 samples obtained. The most abundant species were Cyprideis salebrosa, Heteromastus similis, Scololepsis squamata, Nephtys squamosa, Diplodonta sp. and Tellina

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Valério-Berardo, M. T., M. N. Flynn, L. M. R. Rodrígues, and F. S. Attollini. "SEASONAL COMPOSITION AND SPATIAL DISTRIBUTION OF MACROBENTHIC ASSOCIATIONS ALONG AN ESTUARINE GRADIENT IN ITANHAÉM, SÃO PAULO, BRAZIL." CICIMAR Oceánides 21, no. 1-2 (2006): 1. http://dx.doi.org/10.37543/oceanides.v21i1-2.24.

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Macrobenthos distribution along the salinity gradient and the pattern of species temporal changes were investigated in the Itanhaém River Estuary. Environmental variables such as grain size, sediment organic content, water salinity, water temperature and dissolved oxygen were examined as factors likely to influence the distribution of species. A total of 2130 individuals, distributed in 16 taxa (species/genera) were collected from the 12 samples obtained. The most abundant species were Cyprideis salebrosa, Heteromastus similis, Scololepsis squamata, Nephtys squamosa, Diplodonta sp. and Tellina

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Naik, Richita, Jesly Araujo, Anil Pratihary, Siby Kurian, and S. W. A. Naqvi. "Sedimentary sulphate reduction and organic matter mineralization across salinity gradient of the Mandovi Estuary, West coast of India." Estuarine, Coastal and Shelf Science 221 (May 2019): 21–29. http://dx.doi.org/10.1016/j.ecss.2019.03.005.

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21

Amisi, Joel, Cosmas Munga, Nina Wambiji, and Edward Kimani. "Assessment of vertical and horizontal distribution of meiobenthos along a salinity gradient in the Tana and Sabaki Estuaries, north coast Kenya." Western Indian Ocean Journal of Marine Science 21, no. 1 (2022): 77–89. http://dx.doi.org/10.4314/wiojms.v21i1.6.

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Meiobenthos respond to variability in salinity gradients in estuarine habitats and are thus suitable organisms for ecological studies. The vertical and horizontal distribution of the meiofauna community structure of two major estuaries (Sabaki and Tana) on the north coast of Kenya were compared. The aim was to draw a meiofaunal dataset inventory of the two estuaries and to examine how salinity gradient, seasonality and sediment characteristics influence their structure. Replicate samples were collected from three sampling stations along the salinity gradient of each river estuary. A total of 3

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Milano, Stefania, Bernd R. Schöne, and Igor Gutiérrez-Zugasti. "Oxygen and carbon stable isotopes of Mytilus galloprovincialis Lamarck, 1819 shells as environmental and provenance proxies." Holocene 30, no. 1 (2019): 65–76. http://dx.doi.org/10.1177/0959683619865595.

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Mollusc shell stable isotopes are commonly used to reconstruct past environmental conditions. However, despite being abundant components of natural and anthropogenic fossil accumulations, the geochemical composition of mussel shells ( Mytilus spp.) has rarely received attention in palaeoenvironmental studies. This study tests the suitability of oxygen isotopes (δ18Os) of Mytilus galloprovincialis as palaeothermometer. For 1 year, mussels and water samples were collected twice a month from Berria Beach, in Northern Spain. The geochemical data of the shells indicate that water temperatures can b

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Daverat, F., J. Tomas, M. Lahaye, M. Palmer, and P. Elie. "Tracking continental habitat shifts of eels using otolith Sr/Ca ratios: validation and application to the coastal, estuarine and riverine eels of the Gironde - Garonne - Dordogne watershed." Marine and Freshwater Research 56, no. 5 (2005): 619. http://dx.doi.org/10.1071/mf04175.

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To enable a relevant interpretation of otolith strontium : calcium (Sr/Ca) variations in terms of habitat shifts of eels, the Sr/Ca-salinity relationship in eel otoliths was validated. Downstream and upstream migrations of young eels were reproduced in the laboratory by transferring groups of fish every 2 months between aquaria filled with water coming from the Dordogne river (salinity = 0), the upper Gironde estuary (salinity = 5), the lower Gironde estuary (salinity = 25) and the coast (salinity = 30), which represented the salinity gradient observed in the Gironde–Garonne–Dordogne watershed

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Colombano, DD, AD Manfree, TA O’Rear, JR Durand, and PB Moyle. "Estuarine-terrestrial habitat gradients enhance nursery function for resident and transient fishes in the San Francisco Estuary." Marine Ecology Progress Series 637 (March 5, 2020): 141–57. http://dx.doi.org/10.3354/meps13238.

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Nursery functions of US West Coast drowned river valley estuaries are not well understood. Using long-term fish-monitoring data (1995-2017) in Suisun Marsh, San Francisco Estuary, California, USA, we examined spatial and temporal trends in abundance and apparent growth of fishes with diverse life-history types. Focal species were Sacramento splittail Pogonichthys macrolepidotus, striped bass Morone saxatilis, tule perch Hysterocarpus traski, and starry flounder Platichthys stellatus, which collectively represented 55% of total catch (n = 140092). We identified keystone habitat patches that fun

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Rana, Gita, Angsuman Chanda, and Sanjat Kumar Sahu. "The Salinity-related Spatial Distribution of Penaeid and Palaemonid Prawns in Subarnarekha Estuary, East Coast of India." UTTAR PRADESH JOURNAL OF ZOOLOGY 46, no. 11 (2025): 319–34. https://doi.org/10.56557/upjoz/2025/v46i115033.

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Subarnarekha estuary is important for edible faunal diversity (fish, crab and prawn) in East Coast of India. Prawns are collected throughout the year from January 2023 to December 2024 at two sites Kumbhirgari/Kirtania (S-I) and Dogra (S-II) of the river. Variant environment provides different prawn community resources. Commercially important adult penaeid prawns are found at S-II and both juvenile and adult penaeid as well as palaemonid prawns are found at S-I. These two different salinity gradient environments are formed mainly due to tidal activity as a result of lunar cycle. Salinity range

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Laruelle, Goulven Gildas, Nicolas Goossens, Sandra Arndt, Wei-Jun Cai, and Pierre Regnier. "Air–water CO<sub>2</sub> evasion from US East Coast estuaries." Biogeosciences 14, no. 9 (2017): 2441–68. http://dx.doi.org/10.5194/bg-14-2441-2017.

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Abstract. This study presents the first regional-scale assessment of estuarine CO2 evasion along the US East Coast (25–45° N). The focus is on 42 tidal estuaries, which together drain a catchment of 697 000 km2 or 76 % of the total area within this latitudinal band. The approach is based on the Carbon–Generic Estuary Model (C-GEM) that allows the simulation of hydrodynamics, transport, and biogeochemistry for a wide range of estuarine systems using readily available geometric parameters and global databases of seasonal climatic, hydraulic, and riverine biogeochemical information. Our simulatio

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Cheng, Jiao, Nan Zhang, and Zhongli Sha. "Nuclear microsatellites reveal population genetic structuring and fine-scale pattern of hybridization in the Japanese mantis shrimp Oratosquilla oratoria." PeerJ 8 (November 5, 2020): e10270. http://dx.doi.org/10.7717/peerj.10270.

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The interplay between historical and contemporary processes can produce complex patterns of genetic differentiation in the marine realm. Recent mitochondrial and nuclear sequence analyses revealed cryptic speciation in the Japanese mantis shrimp Oratosquilla oratoria. Herein, we applied nuclear microsatellite markers to examine patterns and causes of genetic differentiation in this morphotaxon. Population structure analyses revealed two genetically divergent and geographically structured clades in O. oratoria, one dominating the temperate zone of the Northwestern (NW) Pacific and the other occ

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Chen, Hui, Qiyan Ji, Qiong Wu, Tengteng Peng, Yuting Wang, and Ziyin Meng. "Seasonal Variability and Underlying Dynamical Processes of Sea Surface Temperature Fronts in Zhoushan and Its Adjacent Seas." Journal of Marine Science and Engineering 12, no. 12 (2024): 2335. https://doi.org/10.3390/jmse12122335.

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The oceanic fronts play an important role in marine ecosystems and fisheries. This study investigates the seasonal variability of sea surface temperature (SST) fronts in Zhoushan and its adjacent seas for the period 1982–2021. The influences of various underlying dynamic processes on the fronts are also discussed. The horizontal gradient of SST is calculated as frontal intensity, and a threshold value of 0.03 °C/km is set to count the frontal frequency. The fronts in Zhoushan and its adjacent seas show significant seasonal variability, with high (0.1 °C/km and 60–90%) and low (0.03 °C/km and 3

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Gaspar, Felipe Lima, Barbara Ramos Pinheiro, Carlos Esteban Delgado Noriega, Moacyr Araujo, Nathalie Lefèvre, and Manuel de Jesus Flores Montes. "Alkalinity, inorganic carbon and CO2 flux variability during extreme rainfall years (2010-2011) in two polluted tropical estuaries NE Brazil." Brazilian Journal of Oceanography 66, no. 1 (2018): 115–30. http://dx.doi.org/10.1590/s1679-87592018149406601.

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Abstract The susceptibility of coastal environments to shifts in the biogeochemical cycles of carbon and nutrients driven by anthropogenic pressure and climate change is a real challenge for the scientific community. This paper evaluated the effects of an extreme rainfall event over the nutrients and carbonate parameters in two polluted tropical estuaries. Surface water samples were taken seasonally along a salinity gradient in the Capibaribe and Barra de Jangadas estuaries in order to investigate the spatial and seasonal variability of dissolved nutrients, chlorophyll-a, dissolved oxygen, tot

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Vikrant, Deshmukh. "Study on Phytoplankton community in Thane Creek along Maharashtra Coast, India." Int. Res. Journal of Science & Engineering, 2024 12, no. 6 (2024): 301–14. https://doi.org/10.5281/zenodo.14472294.

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The current study classified the study regions as ecologically distinct based on hydrobiology and necessity of monitoring, owing to the occurrence of blooms and eutrophication. The ecological well-being of estuarine systems holds importance in light of their socioeconomic significance and susceptibility to heightened anthropogenic pressures. This study, conducted between January 2023 and April 2023, assessed Phytoplankton dynamics along Thane creek, west coast of India. The Thane Creek system possesses characteristics of a macrotidal estuary which experienced high nutrient levels. The tidal ac

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de Sieyes, Nicholas R., Todd L. Russell, Kendra I. Brown, Sanjay K. Mohanty, and Alexandria B. Boehm. "Transport of enterococci and F+ coliphage through the saturated zone of the beach aquifer." Journal of Water and Health 14, no. 1 (2015): 26–38. http://dx.doi.org/10.2166/wh.2015.290.

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Coastal groundwater has been implicated as a source of microbial pollution to recreational beaches. However, there is little work investigating the transport of fecal microbes through beach aquifers where waters of variable salinity are present. In this study, the potential for fecal indicator organisms enterococci (ENT) and F+ coliphage to be transported through marine beach aquifers was investigated. Native sediment and groundwaters were collected from the fresh and saline sections of the subterranean estuary at three beaches along the California coast where coastal communities utilize septi

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Fatela, Francisco, João Moreno, and M. Cristina Cabral. "Salinity and water temperature assessment of the tidal marshes from the W Portuguese coast, as an ecological tool to palaeoenvironmental reconstructions based on Foraminifera and Ostracoda assemblages." Estudos do Quaternário / Quaternary Studies, no. 14 (June 22, 2016): 73–81. http://dx.doi.org/10.30893/eq.v0i14.124.

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A seasonal study of temperature and salinity of estuarine and sediment interstitial water of tidal marshes was undertaken along three estuaries of W Portuguese coast (Minho, Tejo and Mira).The climatic N-S transition from wet Atlantic to Mediterranean features appear clearly imprinted in the distribution of tidal marsh assemblages, like foraminifera and ostracoda, mainly reflecting the water salinity gradient control.The Minho low estuary tidal marsh tends to be flooded by estuarine water ranging from 0.5‰ to 32‰ in each tide cycle, even during dry seasons. However, the marsh hydrological bala

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Fouet, Marie P. A., David Singer, Alexandra Coynel, et al. "Foraminiferal Distribution in Two Estuarine Intertidal Mudflats of the French Atlantic Coast: Testing the Marine Influence Index." Water 14, no. 4 (2022): 645. http://dx.doi.org/10.3390/w14040645.

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This study focuses on the foraminiferal distribution on intertidal mudflats of two contrasted estuaries (Auray and Vie) along the French Atlantic coast. In both estuaries, the foraminiferal communities are dominated by Haynesina germanica and the Ammonia tepida group. Stations located near the outlets show a high diversity and abundance of species of the genus Elphidium. Stations in the inner estuary show a higher proportion of agglutinated species (Ammotium salsum, Ammobaculites agglutinans). Multivariate statistical analysis suggests that the distance to the sea and the percentage of fine se

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Zhang, Yunfeng, Zhenke Zhang, Wayne Stephenson, and Yingying Chen. "Geochemical Behavior of Rare Earth Elements in Tidal Flat Sediments from Qidong Cape, Yangtze River Estuary: Implications for the Study of Sedimentary Environmental Change." Land 13, no. 9 (2024): 1425. http://dx.doi.org/10.3390/land13091425.

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Sediment transport to the sea by rivers is crucial for the stability of estuaries and coasts. The Yangtze River, the largest river in China, like many large rivers worldwide, is experiencing a decrease in sediment load reaching the coast. However, the tidal flat around Qidong Cape, located at the entrance of the North Branch of the Yangtze Estuary, is undergoing extensive siltation. The source of this sediment is unclear. In this study, a sediment core was collected and the geochemical characteristics of rare earth elements (REE) were analyzed using inductively coupled plasma mass spectrometry

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Andrade, Jean Carlo, Santiago Mafla, Kelly Riofrío, José Hernández, Ibon Tobes, and Cristian Lara-Basantes. "Hydrocarbon tolerance evaluation of the microbiota associated with the Roystonea oleracea palm from Santay Island (Ecuador)." IOP Conference Series: Earth and Environmental Science 1434, no. 1 (2024): 012005. https://doi.org/10.1088/1755-1315/1434/1/012005.

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Abstract Soil contamination from hydrocarbon spills has resulted in significant environmental repercussions on a global scale. Bioremediation, which involves the use of living organisms such as microbes to remove contaminants from polluted ecosystems, offers a promising solution. In this study, tolerance tests on hydrocarbons present in Jet Fuel A1 were carried out, utilizing microorganisms isolated from four soil samples (M1, M2, M3, and M4) collected at varying distances from the rhizosphere of Roystonea oleracea on Santay Island, a RAMSAR wetland located in the Guayas River estuary on the P

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Kruglov, G. G., N. N. Linkevich, and O. V. Nemerovets. "Filtration Bypassing Retaining Hydraulic Structures." Science & Technique 19, no. 3 (2020): 252–57. http://dx.doi.org/10.21122/2227-1031-2020-19-3-252-257.

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Concrete dams that are part of river waterworks are integrated with earthworks or with banks using coastal abutments. If the soil of cost or earthen dam is permeable, then in the zone of contiguity water filtration occurs around the coastal abutment. Calculation of filtration bypassing the coastal abutment at specified water levels in the upper and lower pools is performed with the aim of constructing an encircling curve of depression and determining a gradient of filtration flow that controls the filtration strength of the soil beyond the abutment. This problem has no theoretical solutions –

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Daviray, Maxime, Emmanuelle Geslin, Nils Risgaard-Petersen, Vincent V. Scholz, Marie Fouet, and Edouard Metzger. "Potential impacts of cable bacteria activity on hard-shelled benthic foraminifera: implications for their interpretation as bioindicators or paleoproxies." Biogeosciences 21, no. 4 (2024): 911–28. http://dx.doi.org/10.5194/bg-21-911-2024.

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Abstract. Hard-shelled foraminifera are protists able to build a calcareous or agglutinated shell (called a “test”). Here we study the impact of sediment acidification on calcareous test preservation. For this study, sediment cores were sampled in the macrotidal Auray estuary located on the French Atlantic coast. Living and dead foraminifera were quantified until 5 cm depth and discriminated using the Cell-Tracker™ Green vital marker. The pH and oxygen profiles combined with quantitative polymerase chain reaction (qPCR) suggested that cable bacteria were most likely to cause the acidifying pro

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Zhao, Chenyu, Nan Wang, Yang Ding, et al. "Numerical Study on the Formation Mechanism of Plume Bulge in the Pearl River Estuary under the Influence of River Discharge." Water 16, no. 9 (2024): 1296. http://dx.doi.org/10.3390/w16091296.

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Previous studies have investigated the characteristics and influencing factors of plume bulge in the Pearl River Estuary (PRE) using observations and numerical simulations. However, the understanding of how river discharge affects plume bulge is not consistent, and the response mechanism of plume bulge to changes in river discharge has not been revealed in detail. In this study, a three-dimensional hydrodynamic Finite-Volume Coastal Ocean Model (FVCOM) is constructed, and five experiments were set to characterize the horizontal and vertical distribution of the plume bulge outside the PRE under

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Mukherjee, S., E. A. Mohammad, and R. H. Worden. "Satellite data interpretation of causes and controls on groundwater-seawater flow directions, Merseyside, UK: implications for assessing saline intrusions." Hydrology and Earth System Sciences Discussions 2, no. 3 (2005): 887–916. http://dx.doi.org/10.5194/hessd-2-887-2005.

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Abstract. Groundwater in the Triassic Sherwood Sandstone aquifer, Liverpool, UK, has locally elevated chloride concentrations (~4000 mg/l) in parts of the coastal region although there is freshwater right up to the coast line in other areas. The aquifer is cut my numerous faults with vertical displacements of as much 300 m. SPOT satellite data have been used for the Merseyside area of Liverpool. The satellite data revealed and confirmed the location of some of the main faults since the fault zones of the aquifer have low permeability (due to grain crushing, cataclasis, and clay smearing). Wher

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Amorim, Felipe de Luca Lopes de, Areti Balkoni, Vera Sidorenko, and Karen Helen Wiltshire. "Analyses of sea surface chlorophyll a trends and variability from 1998 to 2020 in the German Bight (North Sea)." Ocean Science 20, no. 5 (2024): 1247–65. http://dx.doi.org/10.5194/os-20-1247-2024.

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Abstract. Satellite remote sensing of ocean colour properties allows observation of the ocean with high temporal and spatial coverage, facilitating the better assessment of changes in marine primary production. Ocean productivity is often assessed using satellite-derived chlorophyll a concentrations, a commonly used proxy for phytoplankton concentration. We used the Copernicus GlobColour remote sensing chlorophyll a surface concentration to investigate seasonal and non-seasonal variability, temporal trends, and changes in spring bloom chlorophyll a magnitude. Complementary, we analysed the chl

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Krask, Julie L., Tracy L. Buck, Robert P. Dunn, and Erik M. Smith. "Increasing tidal inundation corresponds to rising porewater nutrient concentrations in a southeastern U.S. salt marsh." PLOS ONE 17, no. 11 (2022): e0278215. http://dx.doi.org/10.1371/journal.pone.0278215.

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Salt marshes are ecologically and economically important features of coastal environments that are vulnerable to sea level rise, the rate of which has accelerated in recent decades along the southeastern US Atlantic coast. Increased flooding frequency and duration across the marsh platform is predicted to impact vegetation community structure and overall marsh persistence, but the effect of changing inundation patterns on biogeochemical processes in marsh sediments remains largely unexplored. As part of a long-term monitoring effort to assess how marshes are responding to sea level rise in Nor

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Grodsky, Semyon A., Nicolas Reul, and Douglas Vandemark. "Summer Chukchi Sea Near-Surface Salinity Variability in Satellite Observations and Ocean Models." Remote Sensing 16, no. 18 (2024): 3397. http://dx.doi.org/10.3390/rs16183397.

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The Chukchi Sea is an open estuary in the southwestern Arctic. Its near-surface salinities are higher than those of the surrounding open Arctic waters due to the key inflow of saltier and warmer Pacific waters through the Bering Strait. This salinity distribution may suggest that interannual changes in the Bering Strait mass transport are the sole and dominant factor shaping the salinity distribution in the downstream Chukchi Sea. Using satellite sea surface salinity (SSS) retrievals and altimetry-based estimates of the Bering Strait transport, the relationship between the Strait transport and

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Alves, Ana Sofia, Helena Adão, Joana Patrício, João Magalhães Neto, Maria José Costa, and João Carlos Marques. "Spatial distribution of subtidal meiobenthos along estuarine gradients in two southern European estuaries (Portugal)." Journal of the Marine Biological Association of the United Kingdom 89, no. 8 (2009): 1529–40. http://dx.doi.org/10.1017/s0025315409000691.

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The spatial variation in abundance and composition of subtidal meiobenthos communities was studied in two Portuguese estuaries under distinct degrees of anthropogenic pressure. Samples were collected from 20 sampling stations along both estuarine gradients from freshwater (<0.5) to euhaline areas (>30). Of these stations 11 were located in the Mondego estuary, a system exposed to high anthropogenic stress, and 9 in the Mira estuary, a naturally stressed system located inside the Natural Park ‘Costa Vicentina’ (south-western coast of Portugal).Total meiobenthos density was higher in the M

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Ellis, Kathryn K., Timothy Callahan, Dianne I. Greenfield, Denise Sanger, Joshua Robinson, and Martin Jones. "Measuring and Modeling Flow Rates in Tidal Creeks: A Case Study from the Central Coast of South Carolina." Journal of South Carolina Water Resources, no. 4 (June 1, 2017): 21–39. http://dx.doi.org/10.34068/jscwr.04.03.

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The purpose of this study was to collect site- and condition-specific hydrology data to better understand the water flow dynamics of tidal creeks and terrestrial runoff from surrounding watersheds. In this paper, we developed mathematical models of tidal creek flow (discharge) in relation to time during a tidal cycle and also estimated terrestrial runoff volume from design storms to compare to tidal creek volumes. Currently, limited data are available about how discharge in tidal creeks behaves as a function of stage or the time of tide (i.e., rising or falling tide) for estuaries in the south

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Zhang, Junjue, and Fenzhen Su. "Spatial Pattern of Construction Land Distribution in Bays along the Coast of Vietnam." ISPRS International Journal of Geo-Information 9, no. 12 (2020): 707. http://dx.doi.org/10.3390/ijgi9120707.

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Current studies of urban spatial morphology have rarely focused on the particularity of coastal cities, such as sea–land gradient features and bay types. In this paper, we provide a method to analyze the spatial and vertical distribution of construction land in the bay area and discuss the influence of bay type on the distribution characteristics. Landscape indexes and a clustering algorithm were used to identify the spatial pattern of construction land distribution. Strip division was used to analyze the landscape features of construction land in the sea–land direction. We established eight l

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Tuchkovenko, Yu S., D. V. Kushnir, V. A. Ovcharuk, A. V. Sokolov, and V. N. Komorin. "Characteristics of Black Sea dispersion of freshened and polluted transitional waters from the Dnipro-Bug estuary after destruction of the Kakhovka Reservoir dam." Ukrainian hydrometeorological journal, no. 32 (December 27, 2023): 95–114. http://dx.doi.org/10.31481/uhmj.32.2023.07.

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This study examines the characteristics of distribution of large volumes of freshened and polluted transitional waters from the Dnipro-Bug estuary across the northwestern part of the Black Sea (NWBS) that was caused by destruction of the Kakhovka HPP dam in June 2023. From June 6, 2023 to June 12, 2023 14.4 km³ of water were discharged from the Kakhovka Reservoir into the Dnipro-Bug estuary and subsequently into the sea. This volume constitutes 27% of the total annual average natural runoff of the Dnipro River (53.5 km³). During the initial days following the dam destruction water flow through

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Torruella, Alfredo J. "HYDRODYNAMICS OF THE CONDADO LAGOON." Coastal Engineering Proceedings 1, no. 33 (2012): 36. http://dx.doi.org/10.9753/icce.v33.posters.36.

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The San Juan Bay Estuary Program and the Corporation for the Conservation of the San Juan Bay  Estuary, intends to develop a cost-effective and environmentally acceptable plan for water quality  improvement and seagrass restoration in the Condado Lagoon. One of the principal challenges associated with this Project is evaluating options for dredge material sources (borrow sites), transport, and placement in the Condado Lagoon to achieve the ecological restoration goal. A potential borrow site has been identified in the northwestern side of San Juan Bay near La Esperanza Peninsula. T

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Gao, Menghan, Bihong Liu, Jianming Li, et al. "Diversity and Distribution of Fungi in the Marine Sediments of Zhanjiang Bay, China." Journal of Fungi 10, no. 12 (2024): 867. https://doi.org/10.3390/jof10120867.

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Fungi are one of the major components of the eukaryotic microbial community in marine ecosystems, playing a significant role in organic matter cycling and food web dynamics. However, the diversity and roles of fungi in marine sediments remain poorly documented. To elucidate the diversity and spatial distribution of fungal communities in the marine sediments of an estuary–coast continuum across three distinct salinity regions in Zhanjiang Bay, China, the variations in fungal diversity, abundance, community structure, and distribution in the sediments were investigated through the application of

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Khrustaleva, Anastasia M. "SNP Polymorphisms Are Associated with Environmental Factors in Sockeye Salmon Populations Across the Northwest Pacific: Insights from Redundancy Analysis." Genes 15, no. 11 (2024): 1485. http://dx.doi.org/10.3390/genes15111485.

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The SNP variation in sockeye salmon across the Asian part of its range was studied in 23 samples from 16 lake–river systems of the West Pacific Coast to improve understanding of genetic adaptation in response to spawning watersheds conditions. Identification of candidate SNPs and environmental factors that can contribute to local adaptations in sockeye salmon populations was carried out using redundancy analysis (RDA), a powerful tool for landscape genetics proven to be effective in genotype–environment association studies. Climatic and hydrographic indices (7 indices in total), reflecting abi

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da Silva, Leiliane Souza, Danielle Viveiros Cavalcante-Braga, Caio Brito Lourenço, Ralf Schwamborn, and Jussara Moretto Martinelli-Lemos. "Factors affecting the seasonal variability of planktonic shrimps (Dendrobranchiata) along an estuary–ocean gradient on the Amazon continental shelf." Journal of the Marine Biological Association of the United Kingdom 101, no. 2 (2021): 331–42. http://dx.doi.org/10.1017/s0025315421000308.

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AbstractDendrobranchiata shrimp taxonomic composition and spatial and temporal distribution on the Amazon continental shelf (ACS) were investigated along a transect between the sources of the Amazon and Pará Rivers, encompassing an extension of ~250 km towards the continental slope. Plankton was collected with oblique trawls (200 μm mesh size), and nine taxa were found; 59.4% were larvae (mysis or decapodid stages) and 40.6% were juveniles or adults. Acetes was negatively related to chlorophyll-a and temperature, and Luciferidae were positively correlated with months. This study provides novel

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