Gotowe bibliografie tematyczne / Estuarine sediments

Gotowa bibliografia na temat „Estuarine sediments”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 30 lipca 2024

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Artykuły w czasopismach na temat "Estuarine sediments"

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Spencer, K. L., i C. L. MacLeod. "Distribution and partitioning of heavy metals in estuarine sediment cores and implications for the use of sediment quality standards". Hydrology and Earth System Sciences 6, nr 6 (31.12.2002): 989–98. http://dx.doi.org/10.5194/hess-6-989-2002.

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Abstract. Total metal concentrations in surface sediments and historically contaminated sediments were determined in sediment cores collected from three estuaries (Thames, Medway and Blackwater) in south-east England. The partitioning behaviour of metals in these sediments was also determined using a sequential extraction scheme. These data were then compared with sediment quality values (SQVs) to determine the potential ecotoxicological risk to sediment dwelling organisms. When total metal concentrations in surface sediments are examined, no risk to biota in any of the estuaries is indicated. However, when historically contaminated sediments at depth are also considered, risks to biota are apparent and are greatest for the Thames, followed by the Medway and then the Blackwater. This suggests that regulatory authorities should examine vertical metal profiles, particularly in estuaries that are experiencing low sediment accumulation rates where historically contaminated sediments are in the shallow sub-surface zone and where erosion or dredging activities may take place. When metal partitioning characteristics are also considered, the risk to biota is comparable for the Medway and the Blackwater with the potentially bioavailable fraction presenting no ecotoxicological risk. Conversely, over 70% of metals are labile in the Thames Estuary sediments and toxic effects are probable. This suggests that the application of SQVs using total sediment metal concentrations may over- or under-estimate the risk to biota in geochemically dissimilar estuarine sediments. Keywords: sediment quality values, estuarine sediments, metal contamination, partitioning, sequential extraction
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Siddiqee, Mahbubul, Rebekah Henry, Rebecca Coulthard, Christelle Schang, Richard Williamson, Rhys Coleman, Graham Rooney, Ana Deletic i David McCarthy. "Salmonella enterica Serovar Typhimurium and Escherichia coli Survival in Estuarine Bank Sediments". International Journal of Environmental Research and Public Health 15, nr 11 (21.11.2018): 2597. http://dx.doi.org/10.3390/ijerph15112597.

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Estuarine bank sediments have the potential to support the survival and growth of fecal indicator organisms, including Escherichia coli. However, survival of fecal pathogens in estuarine sediments is not well researched and therefore remains a significant knowledge gap regarding public health risks in estuaries. In this study, simultaneous survival of Escherichia coli and a fecal pathogen, Salmonella enterica serovar Typhimurium, was studied for 21 days in estuarine bank sediment microcosms. Observed growth patterns for both organisms were comparable under four simulated scenarios; for continuous-desiccation, extended-desiccation, periodic-inundation, and continuous-inundation systems, logarithmic decay coefficients were 1.54/day, 1.51/day, 0.14/day, and 0.20/day, respectively, for E. coli, and 1.72/day, 1.64/day, 0.21/day, and 0.24/day for S. Typhimurium. Re-wetting of continuous-desiccated systems resulted in potential re-growth, suggesting survival under moisture-limited conditions. Key findings from this study include: (i) Bank sediments can potentially support human pathogens (S. Typhimurium), (ii) inundation levels influence the survival of fecal bacteria in estuarine bank sediments, and (iii) comparable survival rates of S. Typhimurium and E. coli implies the latter could be a reliable fecal indicator in urban estuaries. The results from this study will help select suitable monitoring and management strategies for safer recreational activities in urban estuaries.
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Wyness, Adam J., David M. Paterson, James E. V. Rimmer, Emma C. Defew, Marc I. Stutter i Lisa M. Avery. "Assessing Risk of E. coli Resuspension from Intertidal Estuarine Sediments: Implications for Water Quality". International Journal of Environmental Research and Public Health 16, nr 18 (5.09.2019): 3255. http://dx.doi.org/10.3390/ijerph16183255.

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Estuarine sediments are a reservoir for faecal bacteria, such as E. coli, where they reside at greater concentrations and for longer periods than in the overlying water. Faecal bacteria in sediments do not usually pose significant risk to human health until resuspended into the water column, where transmission routes to humans are facilitated. The erosion resistance and corresponding E. coli loading of intertidal estuarine sediments was monitored in two Scottish estuaries to identify sediments that posed a risk of resuspending large amounts of E. coli. In addition, models were constructed in an attempt to identify sediment characteristics leading to higher erosion resistance. Sediments that exhibited low erosion resistance and a high E. coli loading occurred in the upper- and mid-reaches of the estuaries where sediments had higher organic content and smaller particle sizes, and arose predominantly during winter and autumn, with some incidences during summer. Models using sediment characteristics explained 57.2% and 35.7% of sediment shear strength and surface stability variance respectively, with organic matter content and season being important factors for both. However large proportions of the variance remained unexplained. Sediments that posed a risk of resuspending high amounts of faecal bacteria could be characterised by season and sediment type, and this should be considered in the future modelling of bathing water quality.
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Nayak, Ganapati Narayan. "Changing Tropical Estuarine Sedimentary Environments with Time and Metals Contamination, Cest Coast of India". Journal of The Indian Association of Sedimentologists 38, nr 2 (31.12.2021): 63–78. http://dx.doi.org/10.51710/jias.v38i2.141.

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Estuaries are one of the major sub-environments of the coastal zone wherein freshwaters interact and mix with saline waters, and facilitate deposition of finer sediments, organic matter, and metals. Intertidal mudflat and mangrove sediment cores collected from estuaries along the central west coast of India were investigated for various sedimentological and geochemical parameters to understand the changes in the sedimentary depositional environments and various factors influencing the processes. Additionally, estuarine biota was examined to understand the bioaccumulation of metals with respect to bioavailability. The results indicated considerable changes in the depositional environments with time owing to sea-level changes; geomorphology of the estuaries; rainfall and river runoff; anthropogenic activities including construction of dams and bridges. The sediments in the estuaries are considerably polluted by metals and pose toxicity risks to the estuarine biota due to high metal bioavailability. Marine gastropods and mangrove plants act as prospective bio-indicators, and the bioremediation potential of mangroves for contaminated sediments was identified. Metal bioaccumulation in edible benthic biota can be harmful to the human health.
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Da Silva Santos, Isaac, i Marjorie Nolasco. "Modelagem de Fundo do Estuário do Serinhaém – Ba: Morfologia e Granulometria / Modeling of the bottom of Serinhaém’s estuary, BA: Morphology and Granulometry." Caderno de Geografia 27, nr 49 (2.05.2017): 247. http://dx.doi.org/10.5752/p.2318-2962.2017v27n49p247.

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<p>O presente estudo teve como objetivo elaborar um modelo de distribuição granulométrica e morfologia de fundo do Estuário do Serinhaém em Ituberá-BA. Os procedimentos metodológicos envolveram <em>à priori</em> coleta de sedimentos e dados de profundidade ao longo do estuário. As amostras de sedimentos foram tratadas para análise granulométrica segundo metodologia proposta por Suguio (1973), e posteriormente os dados de sedimento foram tabulados e modulados espacialmente, seguindo o mesmo procedimento que os dados de morfologia de fundo. Observou-se que o estuário do Serinhaém faz parte de um sistema estuarino maior que conflui à Baía de Camamu, cuja morfologia de fundo se destaca pela presença de “degraus”, onde a profundidade aumenta gradualmente em direção a sua foz, mantendo as maiores profundidades entre o centro e a margem norte do estuário. Sua granulometria é predominantemente arenosa com frações de sedimento cascalhosos na sua calha, e ao longo de todo ambiente é caracterizado por áreas de baixios, devido a acumulação de sedimentos.</p><p>O levantamento dessas informações é básico para subsidiar estudos ambientais e auxiliar o planejamento territorial e o manejo dessa área estuarina.</p><p><strong>Palavras–chave:</strong> Sedimentos; Ambientes Costeiros; Estuários; Morfologia de Fundo.</p><p><strong>Abstract </strong></p><p>The aim of this study was to build a model for particle size distribution and bottom morphology in Serinhaém´s estuary from Ituberá, BA. Methodological proceedings implicated a priori to collect sediments and depth data according to the methodology developed by Suguio (1973); after that, sediments data were tabulated and spatially modeled according to the same procedure taken for the data obtained for bottom morphology. It was observed that Serinhaém´s estuary is a part from largest estuarine system which converges in Camamu´s Bay, in whose bottom morphology are noted the presence of “steps”, gradually increasing the depth in direction to the river mouth and keeping the higher depths between the middle and north shore of the estuary. Particle size is basically sandy with gravel sediments in its riverbed and was observed, throughout the entire environment, the presence of shoals due to accumulation of sediments. These results are basic to support environmental studies and to help the territorial planning and management of this estuarine area.</p><p><strong>Keywords</strong>: garbage collectors, recycling, working conditions, Association.</p><p> </p>
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Newton, Gina M., i Brad D. Mitchell. "Egg dormancy in the Australian estuarine-endemic copepods Gippslandia estuarina and Sulcanus conflictus, with reference to dormancy of other estuarine fauna". Marine and Freshwater Research 50, nr 5 (1999): 441. http://dx.doi.org/10.1071/mf98161.

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The presence of dormant life history stages was investigated for the zooplankton of an annually flooding salt-wedge estuary. Such stages are seen as a potential mechanism for population persistence following environmental adversity. Laboratory incubation experiments were conducted on estuarine sediments. As a result, dormant eggs in Australian estuarine-endemic copepods are reported for the first time. Nauplii of the dominant estuarine-endemic calanoids Gippslandia estuarina and Sulcanus conflictus commonly hatched from the sediments. Manipulation of the salinity and temperature of experimental media indicated that temperature was the more important hatching trigger for S. conflictus, and that both high salinity and high temperature were important for G. estuarina. Results of the incubation experiments, including those of ‘conversion’ experiments (i.e. from freshwater to saline conditions or low temperature to high temperature), help to elucidate the type of dormancy characteristic of each species; it appears that S. conflictus may have diapause eggs and G. estuarina may have quiescent eggs, although this is yet to be confirmed. Other estuarine fauna developed from the mud during the incubation experiments, most notably the harpacticoids Onychocamptus chathamensis, an ectinosomatid and Schizopera sp., and the medusa Australomedusa baylii. Ecological and evolutionary consequences of dormancy in these estuarine-endemic zooplankton are briefly discussed.
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Dowson, P. H., J. M. Bubb, T. P. Williams i J. N. Lester. "Degradation of Tributyltin in Freshwater and Estuarine Marina Sediments". Water Science and Technology 28, nr 8-9 (1.10.1993): 133–37. http://dx.doi.org/10.2166/wst.1993.0611.

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The degradation of tributyltin (TBT) in contaminated freshwater and estuarine sediments was investigated for a 330 day period under controlled laboratory conditions. Rates of TBT degradation at different depths were established using regression modelling and revealed TBT half lives ranging from 360-775 d in surficial sediments. There appeared to be little difference in degradation rates between freshwater and estuarine sediments, although a notable increase in TBT half life was evident in TBT spiked sediments. Degradation values suggest that TBT either debutylates to DBT and MBT in aerobic sediments or degrades to DBT which is subsequently desorbed to the overlying water. In anaerobic sediment the half life of TBT was not discernible and appeared to be in the order of tens of years. Biotic processes would seem to be the most important mechanisms for the decomposition of TBT in freshwater and estuarine sediments.
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De Oliveira, Allan De Oliveira. "CARACTERIZAÇÃO SEDIMENTAR E APLICAÇÃO DO DIAGRAMA DE PEJRUP PARA INTERPRETAÇÃO DA DINÂMICA EM UMA ENSEADA ESTUARINA NA LAGOA DOS PATOS/BRASIL / Sedimentary Characterization and Application of Pejrup Diagram to Interpret the Dinamics in a Small Cove of The Lagoa dos Patos/Brazil". Geographia Meridionalis 1, nr 2 (18.12.2015): 363. http://dx.doi.org/10.15210/gm.v1i2.6232.

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A partir da análise dos parâmetros estatísticos dos sedimentos de fundo de uma enseada estuarina e da aplicação do diagrama de Pejrup, foi possível caracterizar os processos dinâmicos e sedimentares que ocorrem em uma pequena enseada da Lagoa dos Patos. Os sedimentos que recobrem o fundo da área estudada são formados por areias finas a muito finas, com presença de material lamoso, preferencialmente silte, em direção à região central e margens da enseada. A hidrodinâmica da área é dominada pela circulação estuarina e correntes fluviais, bem como pela ação dos ventos que influenciam estas correntes. Esses fatores são responsáveis pelo transporte, redistribuição e deposição dos sedimentos na área de estudo.ABSTRACTFrom statistical parameters of the bottom morphology and of the application of the diagram of Pejrup it was possible to characterize the dynamic and sedimentary processes that occur in a small cove of the Lagoa dos Patos. The sediments that recover the bottom of the studied area are formed by fine to very fine sands, with the presence of muddy (silt) in the central region and marginal area. The hydrodynamic of the area is dominated by the estuarine circulation and fluvial currents as well, partly due the action of winds which influence these currents. These factors are responsible for the transport, redistribution and deposition of the sediments in the study area.Keywords: sedimentary characterization; hydrodinamics; estuarine cove.
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Simone, Michelle N., Kai G. Schulz, Joanne M. Oakes i Bradley D. Eyre. "Warming and ocean acidification may decrease estuarine dissolved organic carbon export to the ocean". Biogeosciences 18, nr 5 (16.03.2021): 1823–38. http://dx.doi.org/10.5194/bg-18-1823-2021.

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Abstract. Relative to their surface area, estuaries make a disproportionately large contribution of dissolved organic carbon (DOC) to the global carbon cycle, but it is unknown how this will change under a future climate. As such, the response of DOC fluxes from microbially dominated unvegetated sediments to individual and combined future climate stressors of temperature change (from Δ−3 to Δ+5 ∘C compared to ambient mean temperatures) and ocean acidification (OA, ∼ 2× current CO2 partial pressure, pCO2) was investigated ex situ. Warming alone increased sediment heterotrophy, resulting in a proportional increase in sediment DOC uptake; sediments became net sinks of DOC (3.5 to 8.8 mmol C m−2 d−1) at warmer temperatures (Δ+3 and Δ+5 ∘C, respectively). This temperature response changed under OA conditions, with sediments becoming more autotrophic and a greater sink of DOC (up to 4× greater than under current pCO2 conditions). This response was attributed to the stimulation of heterotrophic bacteria with the autochthonous production of labile organic matter by microphytobenthos. Extrapolating these results to the global area of unvegetated subtidal estuarine sediments, we find that the future climate of warming (Δ+3 ∘C) and OA may decrease estuarine export of DOC by ∼ 80 % (∼ 150 Tg C yr−1) and have a disproportionately large impact on the global DOC budget.
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Charry, Maria P., Vaughan Keesing, Mark Costello i Louis A. Tremblay. "Assessment of the ecotoxicity of urban estuarine sediment using benthic and pelagic copepod bioassays". PeerJ 6 (30.05.2018): e4936. http://dx.doi.org/10.7717/peerj.4936.

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Urban estuarine sediments are sinks to a range of contaminants of anthropogenic origin, and a key challenge is to characterize the risk of these compounds to receiving environments. In this study, the toxicity of urban estuarine sediments was tested using acute and chronic bioassays in the benthic harpacticoid Quinquelaophonte sp., and in the planktonic calanoid Gladioferens pectinatus, two New Zealand copepod species. The sediment samples from the estuary tributary sites significantly impacted reproduction in Quinquelaophonte sp. However, results from one of the estuary sites were not significantly different to those from the tributaries sites, suggesting that chemicals other than trace metals, polycyclic aromatic hydrocarbons and ammonia may be the causative stressors. Sediment elutriate samples had significant effects on reproductive endpoints in G. pectinatus, and on the induction of DNA damage in cells, as shown by the comet assay. The results indicate that sediment contamination at the Ahuriri Estuary has the potential to impact biological processes of benthic and pelagic organisms. The approach used provides a standardized methodology to assess the toxicity of estuarine sediments.
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Rozprawy doktorskie na temat "Estuarine sediments"

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Kleinot, Jacqueline. "Interactions of radionuclides with estuarine sediments". Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/8485.

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Lee, Chang-Hee. "Resuspension behavior of natural estuarine sediments". W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539616734.

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The resuspension behavior of natural estuarine sediments was studied using the VIMS Sea Carousel, a benthic annular flume. The bed shear stresses produced by the flume were measured by a hot-film sensor mounted flush on the bottom of a laboratory version of the Carousel under a clear-water and flat-bottom condition. Measurements showed a reasonably uniform bed shear stress across the channel and agreed with the relationship &\tau\sb{lcub}\rm b{rcub}=0.011\Omega\sp{lcub}1.69{rcub},& where &\Omega& = ring speed (rpm) and &\tau\sb{lcub}\rm b{rcub}& = spatially-averaged bed shear stress (N/m&\sp2&), predicted from a previous numerical study. Thus, the &\tau\sb{lcub}\rm b{rcub}& was used as a bed shear stress parameter for this study. Field resuspension experiments were conducted during each season for a full year at two sites in the lower Chesapeake Bay. All the field measurements indicated the existence of surficial fluff on top of the relatively well consolidated sediment beds. These sediment beds behaved like cohesive beds despite the sand dominance, and showed an exponentially decreasing resuspension rate with time for a constant &\tau\sb{lcub}\rm b{rcub}.& These characteristics reflect that the natural sediment beds at the study sites developed a depth-increasing erosion resistance profile. Measured critical bed shear stress, &\tau\sb{lcub}\rm cr{rcub},& was slightly larger at the Wolftrap site than at the Cherrystone site (0.13 &\sim& 0.15 vs. 0.1 &\sim& 0.12 N/m&\sp2&) because of the spatial variation of physical energy condition and biological activity. The temporal variation of sediment erodibility was observed at Cherrystone, but it was not apparent at Wolftrap. From all of the field measurements, a relationship (n = 32, r&\sp2& = 0.89) was found between initial resuspension rate (E&\sb{lcub}\rm o{rcub},& in kg/m&\sp2&/sec) and approximate excess bed shear stress (&\rm\tau\sb{lcub}b{rcub}&-&\rm\tau\sb{lcub}cr{rcub},& in N/m&\sp2&), E&\sb{lcub}\rm o{rcub}& = M(&\tau\sb{lcub}\rm b{rcub}&-&\tau\sb{lcub}\rm cr{rcub})\sp\eta,& where the constants M and &\eta& are 0.018 and 1.88, respectively. Laboratory resuspension tests using the bottom sediments collected at the field sites showed a noncohesive nature of sediment bed (e.g. ripple formation) and much smaller E&\sb{lcub}o{rcub}& (&1\sim2& orders of magnitude) than those measured in the field. These differences reflect the complex nature of sediment properties and constant biophysical reworking processes in the natural environments. The differences also indicate that the direct application of the laboratory results to predict the erodibility of natural sediment is not warranted.
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Said, Gisele Witt 1988. "Ecotoxicidade associada à contaminação por metais em sedimento no Rio Morrão, sistema estuarino de Santos-Cubatão, SP". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/286627.

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Orientadores: Wanilson Luiz Silva, Denis Moledo de Souza Abessa
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências
Made available in DSpace on 2018-08-25T01:32:41Z (GMT). No. of bitstreams: 1 Said_GiseleWitt_M.pdf: 1373537 bytes, checksum: 73f24c5e72f7e683293e5a8cbd0920ca (MD5) Previous issue date: 2014
Resumo: O sedimento representa um importante compartimento na avaliação do nível de contaminação dos ecossistemas aquáticos, pois nele é possível observar o acúmulo e a integração de muitos contaminantes presentes. O sistema estuarino de Santos-Cubatão (SP) tem sido apontado como um ambiente sedimentar seriamente poluído, devido à emissão descontrolada de efluentes urbanos e industriais. Neste sistema, o rio Morrão (foco deste estudo) tem sofrido, em particular, o impacto de atividades nos últimos 60 anos de indústria de fertilizantes e siderurgia. Com o objetivo de avaliar a qualidade dos sedimentos deste ambiente, estudos da toxicidade e biodisponibilidade de alguns contaminantes e caracterização físico-química foram realizados durante a estação seca, em amostras coletadas ao longo da borda do manguezal. Na avaliação, vários parâmetros ambientais foram levantados, incluindo: determinação de monossulfetos volatilizáveis por acidificação (AVS) e metais simultaneamente extraídos (SEM); granulometria (caracterização da textura) e matéria orgânica (MO) dos sedimentos; análise da concentração total dos elementos químicos; e aplicação de testes ecotoxicológicos agudo (utilizando-se Tiburonella viscana) e crônico (copépodes Nitocra sp). Os resultados obtidos apresentaram sedimentos com a fração silte dominante (>60% do volume das amostras) e a MO mostrou valores entre 9,15% e 22,3%. O AVS apresentou concentrações entre 0,43 e 41,38 µmol g?1 nos pontos amostrados e SEM entre 0,48 a 7,02 µmol g?1, sugerindo que efeitos adversos nos organismos expostos não seriam potencialmente esperados na área de estudo. Contudo, testes com os organismos vivos revelaram toxicidade aguda em alguns pontos, enquanto a toxicidade crônica foi evidente em todos os pontos amostrados. O método SEM/AVS indicou que pelo menos três pontos da área de estudo poderiam ser tóxicos. Em geral, a toxicidade crônica identificada nos testes biológicos não foi corroborada pela relação SEM/AVS, cuja concentração molar de metais potencialmente tóxicos (extração com HCl 6 M) foi inferior à concentração molar de monossulfetos que normalmente funcionam como ligantes destes metais nos sedimentos. Porém para a toxicidade aguda, a relação SEM/AVS mostrou concordância em 5 das 8 amostras testadas, o que sugere um poder razoável do método SEM/AVS para prever este tipo de toxicidade. Isso indica que quanto maior a disponibilidade de sítios de sulfetos para aprisionamento dos metais lábeis, menor a toxicidade aguda observada. Por outro lado, a comparação das concentrações de metais totais (e.g. Cd, Cr, Cu, Hg, Ni, Pb e Zn) com o nível de referência de contaminação (Nível 1) proposto por CONAMA 454 sugere que 7 dos 8 sedimentos são potencialmente tóxicos. Este aspecto mostrou alta concordância com a toxicidade crônica identificada. Comportamento assim revela que os efeitos crônicos possivelmente possuem relação com o fato de que os copépodos usados no estudo podem se expor e sofrer os efeitos adversos dos metais possivelmente mais solúveis na água intersticial dos sedimentos testados. Adicionalmente, a ingestão do próprio sedimento por estes organismos é outro aspecto a ser considerado. Os resultados deste estudo revelam que o método SEM/AVS prevê razoavelmente a toxicidade aguda, enquanto a excedência de Nível 1 segundo CONAMA 454 (2012) prevê muito bem toxicidade crônica dos sedimentos
Abstract: Sediments represent an important compartment to assess contamination levels of aquatic ecosystems, because it is possible to observe the accumulation and the integration of a variety of contaminants in them. The Santos-Cubatão Estuarine System (São Paulo Estate ¿ Brazil) has been pointed out as a severely polluted sedimentary environment due to the uncontrolled emission of urban and industrial effluents. Particularly in this system, the Morrão River (object of this study) has undergone the impact of activities related to fertilizers and iron industries in the last 60 years. Aiming at evaluating the quality of the sediments in this environment, a study of the toxicity and bioavailability of some contaminants and a physical-chemical characterization were carried out during the dry season, by means of sampling along mangrove margins. Several environmental parameters were assessed, including: concentrations of acid volatile monosulfides (AVS) and simultaneously extracted metals (SEM); grain size (texture characterization) and organic matter content (MO); analysis of the total chemical element concentration; and the application of acute (using Tiburonella viscana) and chronic (copepod Nitocra sp) ecotoxicity tests. The results revealed that the silt fraction is dominant in the sediments (>60% sample volume) and that MO contents range from 9.15% and 22.3%. The AVS showed concentrations between 0.43 and 41.38 µmol g?1 in the sampled points and SEM between 0.48 and 7.02 µmol g?1, suggesting that adverse effects would not be potentially expected in exposed organisms in the study area. However, tests with living organisms revealed acute toxicity in some points, whereas chronic toxicity was evident in all sampled points. The SEM/AVS method indicated that at least three points of the study area could be toxic. In general, chronic toxicity identified in the biological tests was not corroborated by the SEM/AVS ratio, once the molar concentration of potentially toxic metals (HCl 6 M extraction) was lower than the molar concentration of monosulfides that usually act as bonding agents. For the acute toxicity, the SEM/AVS ratio was concordant in 5 out of the 8 tested samples, which suggests a reasonable efficiency of the SEM/AVS method to predict this type of toxicity. The higher the availability of sulfide sites is for trapping of labile metals, the lower the acute toxicity observed. On the other hand, the comparison of the total metal concentrations (e.g. Cd, Cr, Cu, Hg, Ni, Pb and Zn) with the contamination level reference (Level 1) proposed by CONAMA 454 indicates that 7 out of the 8 sediment samples are potentially toxic. This aspect is highly concordant with the chronic toxicity identified in the study area. Such behavior reveals that the chronic effects are possibly related to the fact that the copepods used in the study can expose themselves and undergo the adverse effects of the metals that are possibly more soluble in the sediment interstitial water. Additionally, the ingestion of the sediment itself by these organisms is another aspect to be considered. The results of this study reveal that the SEM/AVS method reasonably predicts acute toxicity, whereas chronic toxicity is well assessed by contents exceeding Level 1 values
Mestrado
Geologia e Recursos Naturais
Mestra em Geociências
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Ramachandran, Shahunthala Devi. "Toxicity associated with sediments from Malaysian estuarine environment". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23170.pdf.

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Reay, William Glendon. "Estuarine sediment nutrient exchange : the importance of physical transport mechanisms and benthic micro-communities /". Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07122007-103937/.

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Raymundo, Cristina Coelho. "Linear alklbenzenes in marine and estuarine sediments". Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317231.

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Yeh, Chen-Ying. "The biogeochemistry of dimethylsulphoniopropionate in estuarine sediments". Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327256.

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Prastka, Katherine. "Phosphorus cycling in intertidal sediments". Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320776.

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Berno, Ludimila 1980. "Sazonalidade geoquímica multi-elementar em diferentes frações granulométricas de sedimentos do sistema estuariano de Santos - Cubatão/SP". [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287640.

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Orientadores: Wanilson Luiz Silva
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências
Made available in DSpace on 2018-08-17T18:33:01Z (GMT). No. of bitstreams: 1 Berno_Ludimila_M.pdf: 1326386 bytes, checksum: bdc4fd9ab44fe6c8795d63ccb8fb7e12 (MD5) Previous issue date: 2010
Resumo: O sistema estuarino de Santos-Cubatão (SP) está localizado em uma das áreas mais industrializadas da América Latina. Os estuários são ambientes de grande complexidade, onde ocorrem interrelações entre componentes geológicos, físicos, biológicos e químicos. O histórico de contaminação desse ambiente estuarino, decorrente de diferentes atividades antrópicas, pode resultar em altos níveis de contaminação, e os sedimentos podem representar uma fonte latente de elementos-traço para o ambiente aquático. Com o objetivo de investigar a variabilidade geoquímica sazonal de elementos-traço, os sedimentos de superfície dos principais rios deste sistema estuarino (Casqueiro, Cubatão, Cascalho, Morrão e Capivari) foram amostrados no inverno e no verão. Concentrações químicas multi-elementares em diferentes granulometrias (<63 mm, <177 mm e total), obtidas por ICP-MS, e os níveis de matéria orgânica foram relacionados. As texturas dos sedimentos estudados apresentaram característica silto-argilosa (64 a 87%). Os maiores níveis de matéria orgânica foram encontrados nos sedimentos do rio Morrão (10,92 a 12,05%), porém não foi observada relação com a granulometria. Em geral, os metais e metalóides foram mais concentrados na textura silto-argilosa, mas isso não foi sistemático para todo o ambiente. Considerando fatores de enriquecimento, anomalias geoquímicas foram encontradas para os elementos Be, Bi, Ca, Co, Cu, Cd, Cr, Fe, Hf, Hg, Mn, Ni, Nb, P, Pb, Sb, Sr, Ta, Th, U, Y, Zn e Zr especialmente no rio Morrão. Com exceção do rio Capivari, o Hg e o P foram os únicos elementos que se apresentaram anômalos nos demais rios investigados. Elementos como Al, As, Cs, K, Li, Mg, Na, Rb, S, Ti e V apresentaram comportamento geogênico ao longo de todo o ambiente deste estudo. A sazonalidade geoquímica foi notificada claramente nos sedimentos do rio Morrão e parece não ocorrer para a maioria dos elementos tratados nos demais rios investigados. Em geral, foi observado um maior enriquecimento dos elementos contaminantes durante o verão, provocando uma diminuição relativa dos elementos geogênicos nesta estação. O contrário ocorreu durante o inverno. Este trabalho mostrou que o incremento nos níveis de contaminação favorece a flutuação sazonal das concentrações de elementos nos sedimentos. Possivelmente, a sazonalidade associada aos elementos contaminantes pode estar ligada ao fato de estes elementos ocuparem posições mais instáveis em fases minerais e não-minerais do ambiente sedimentar. Isso possibilita uma maior mobilização da carga de elementos contaminantes em função das variações das condições físicas e/ou químicas do meio (pH, Eh, salinidade), se comparada aos elementos geogênicos mais estáveis no ambiente.
Abstract: The Santos-Cubatão estuarine system (SP) is located in one of the most industrial areas in Latin America. Estuaries are environments of great complexity where there is an interrelation among geological, physical, biological, and chemical compounds. The contamination history at this environment is a result of different anthropic activities which can be high, and the sediments can represent a significant source of trace elements to aquatic environment. By investigating the seasonal geochemical range of trace elements, the surface sediments of the main rivers from this estuarine system (Casqueiro, Cubatão, Cascalho, Morrão, and Capivari) were sampled in the winter and summer. Multi-elemental chemical concentrations in different grain-size (<63 mm, <177 mm and total), gotten by ICP-MS, and the organic matter level were related. The texture of the studied sediments presented silt-clay characteristics (64 to 87%). The highest levels of organic matter were found in the sediments of Morrão River (10.92 to 12.05%), however, no direct relation with the grain-size. In general, the metals and metalloids were more concentrated in the siltclay texture, but it was not systematic to the entire estuary. Regarding enrichment factors, geochemical anomalies were found to the following elements Be, Bi, Ca, Co, Cu, Cd, Cr, Fe, Hf, Hg, Mn, Ni, Nb, P, Pb, Sb, Sr, Ta, Th, U, Y, Zn, and Zr, mainly in Morrão River. The only elements that were presented anomalous in every river studied, except in Capivari River, were Hg and P. Elements as Al, As, Cs, K, Li, Mg, Na, Rb, S, Ti, and V presented geogenic behavior all along the environment of this study. The geochemical seasonality was clearly seen in the sediments of Morrão River, but not conclusive to most elements in the other rivers. In general, it was observed a higher enrichment of contaminant elements during the summer, causing a relatively decrease of geogenic elements in that season. However, the opposite happened during the winter. This work shows that the increment in the contamination level contributes to the seasonal fluctuation of the element concentrations in the sediments (e.g. Morrão River). The seasonality associated to the contaminant elements can be regarded to the fact that these elements occupy more unstable positions in mineral and non-mineral phases of the sedimentary environment, leading to a great mobilization of contaminant elements load caused by the physical and/or chemical range of conditions of the environment (mainly, pH, Eh and salinity), when compared to the more stable geogenic elements in the environment.
Mestrado
Geologia e Recursos Naturais
Mestre em Geociências
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Stoddard, Daniel Mark. "Evaluation of sediment trap efficiency in an estuarine environment". Thesis, Springfield, Va. : Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA403559.

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Książki na temat "Estuarine sediments"

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Workshop, on Cohesive Sediment Dynamics with Special Reference to Physical Processes in Estuaries (1984 Tampa Fla ). Estuarine cohesive sediment dynamics: Proceedings of a workshop on cohesive sediment dynamics with special reference to physical processes in estuaries, Tampa, Florida, November 12-14, 1984. Berlin: Springer-Verlag, 1986.

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Hobbs, C. H. York Estuary sediments. Gloucester Point, Va: School of Marine Science, Virginia Institute of Marine Science, 1994.

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Fry, Virginia A. Tidal velocity asymmetries and bedload transport in shallow embayments. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1987.

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Radtke, Dean B. Sediment sources and transport in Kings Bay and vicinity, Georgia and Florida, July 8-16, 1982. Washington: U.S. G.P.O., 1985.

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Duursma, E. K. Are tropical estuaries environmental sinks or sources? Rio de Janeiro, RJ, Brasil: MCT, CNPq, CETEM, 1995.

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Duursma, E. K. Are tropical estuaries environmental sinks or sources? Rio de Janeiro, RJ, Brasil: MCT, CNPq, CETEM, 1995.

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Willem T. B. van der Lee. The settling of mud flocs in the Dollard estuary, the Netherlands. Utrecht: Koninklijk Nederlands Aardrijkskundig Genootschap, Faculteit Ruimtelijke Wetenschappen Universiteit Utrecht, 2000.

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E, Myers Tommy, i U.S. Army Engineer Waterways Experiment Station., red. Leachate testing and evaluation for estuarine sediments. Vicksburg, Miss: US Army Corps of Engineers, Waterways Experiment Station, 1996.

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1946-, Hobbs C. H., red. A 100-year sediment budget for Chesapeake Bay. Gloucester Point, Va: College of William and Mary, School of Marine Science, Virginia Institute of Marine Science, 1990.

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Wells, John T. A scoping study of the distribution, composition, and dynamics of water-column and bottom sediments, Albemarle-Pamlico estuarine system. Morehead City, N.C: Institute of Marine Sciences, University of North Carolina at Chapel Hill, 1989.

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Części książek na temat "Estuarine sediments"

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Crompton, Thomas R. "Estuarine Sediments". W Analysis of Solids in Natural Waters, 111–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-85223-7_5.

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d'Anglejan, Bruno. "Recent sediments and sediment transport processes in the St. Lawrence Estuary". W Coastal and Estuarine Studies, 109–29. Washington, D. C.: American Geophysical Union, 1990. http://dx.doi.org/10.1029/ce039p0109.

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Das, Gautam Kumar. "Granulometry of Mangrove Sediments". W Estuarine Morphodynamics of the Sunderbans, 103–17. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11343-2_6.

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Yamamoto, A. "Bottom sediments and paleo-hydrological processes". W Coastal and Estuarine Studies, 153–67. Washington, D. C.: American Geophysical Union, 1995. http://dx.doi.org/10.1029/ce048p0153.

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Montague, Clay L. "Influence of Biota on Erodibility of Sediments". W Estuarine Cohesive Sediment Dynamics, 251–69. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4936-8_13.

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Montague, Clay L. "Influence of Biota on Erodibility of Sediments". W Estuarine Cohesive Sediment Dynamics, 251–69. New York Inc.: Springer-Verlag, 2013. http://dx.doi.org/10.1029/ln014p0251.

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Suhayda, Joseph N. "Interaction Between Surface Waves and Muddy Bottom Sediments". W Estuarine Cohesive Sediment Dynamics, 401–28. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4936-8_18.

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Suhayda, Joseph N. "Interaction Between Surface Waves and Muddy Bottom Sediments". W Estuarine Cohesive Sediment Dynamics, 401–28. New York Inc.: Springer-Verlag, 2013. http://dx.doi.org/10.1029/ln014p0401.

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Wells, John T., i G. Paul Kemp. "Interaction of Surface Waves and Cohesive Sediments: Field Observations and Geologic Significance". W Estuarine Cohesive Sediment Dynamics, 43–65. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4936-8_3.

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Wells, John T., i G. Paul Kemp. "Interaction of Surface Waves and Cohesive Sediments: Field Observations and Geologic Significance". W Estuarine Cohesive Sediment Dynamics, 43–65. New York Inc.: Springer-Verlag, 2013. http://dx.doi.org/10.1029/ln014p0043.

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Streszczenia konferencji na temat "Estuarine sediments"

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BROADFOOT, M. S. S., A. C. BURKE, M. A. HEMER, K. L. MCINNES, T. P. MURRAY i H. E. POWER. "CHANGE DETECTION OF SHALLOW WATER ESTUARINE INLET MORPHOLOGY USING REMOTE SENSING TECHNOLOGIES". W Coastal Sediments 2023. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811275135_0141.

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VANDENHOVE, MARINE, BRUNO CASTELLE, ALEXANDRE NICOLAE LERMA, VINCENT MARIEU, CYRIL MALLET i VINCENT MAZEIRAUD. "MULTIDECADAL SHORELINE VARIABILITY LINKED WITH ESTUARINE SANDBANK WELDING: THE NORTH MEDOC COAST, SOUTHWEST FRANCE". W Coastal Sediments 2023. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811275135_0134.

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MCPHERSON, RONALD, PHILIP BLACKMAR i DANIEL HEILMAN. "RESTORING ESTUARINE HABITAT IN GALVESTON WEST BAY THROUGH PLACEMENT OF DREDGED SEDIMENTS: MONITORING AND LESSONS LEARNED". W Coastal Sediments 2015. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814689977_0090.

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DE SANTANA OLIVEIRA, THAÍS, ROBERTO LIMA BARCELLOS, CARLOS AUGUSTO FRANÇA SCHETTINI i PLÍNIO BARBOSA DE CAMARGO. "THE DISTRIBUTION OF ORGANIC MATTER AND MODERN SEDIMENTARY PROCESSES IN AN URBAN TROPICAL ESTUARINE SYSTEM, BRAZIL". W Coastal Sediments 2015. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814689977_0154.

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Agbogun, Henry, Hendratta Ali, Eliot Atekwana, Isaac Konfor Njilah i Jennifer Latimer. "INVESTIGATION OF WATER - SEDIMENTS INTERACTION IN ESTUARINE RIVERS". W Joint 118th Annual Cordilleran/72nd Annual Rocky Mountain Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022cd-374345.

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Zhang, Wei, Mingyuan Yang, Xiaolin Zhang i Peipei Dong. "Study on the Characteristics of Temporal and Spatial Variation of Suspended Sediment in the Pearl River Estuary". W ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79033.

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The Lingding Estuary is one of the main parts of the whole Pearl River Delta, which lies in the South Sea, China. It is about 60 km wide from Hong Kong in the east to Macao in the west and the water areas are approximately 2110 km2. The process of suspended sediment movement is influenced by many factors, such as the estuarine geometry, tidal range and ravine flows etc.. In this paper, large scale hydrological observations in the Lingding Estuary have been respectively carried out in July, 2003. Based on these data, characteristics of temporal and spatial variation of suspended sediment concentration (SSC) in the Lingding Estuary are studied. The research result shows that SSC changes with the variation of tide current and runoff, the sediment re-suspension is often occurred 1–2 hour following the flood or ebb tide. The maximum turbidity appears near the gauging station V3. In the flood dominant stage, the sediments move towards the mainland, while during the ebb sediments move down.
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Benjamin C. Doerge. "Foundation Design for Manure Tanks on Soft Estuarine Sediments". W 2006 Portland, Oregon, July 9-12, 2006. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2006. http://dx.doi.org/10.13031/2013.21127.

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AUGUSTIN, LAUREN N., DANIEL J. HEILMAN i DENNIS D. ROCHA. "RESTORING ESTUARINE HABITAT IN GALVESTON WEST BAY THROUGH BENEFICIAL USE OF DREDGED SEDIMENTS". W The Proceedings of the Coastal Sediments 2011. World Scientific Publishing Company, 2011. http://dx.doi.org/10.1142/9789814355537_0192.

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Cartwright, G. M., C. T. Friedrichs i L. P. Sanford. "IN SITU CHARACTERIZATION OF ESTUARINE SUSPENDED SEDIMENT IN THE PRESENCE OF MUDDY FLOCS AND PELLETS". W The Proceedings of the Coastal Sediments 2011. World Scientific Publishing Company, 2011. http://dx.doi.org/10.1142/9789814355537_0049.

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SANTOS, L. D., T. T. VEIGA, P. B. CAMARGO i R. L. BARCELLOS. "INFLUENCE OF THE INDUSTRIAL PORT COMPLEX OF SUAPE ON IPOJUCA ESTUARINE SURFACE SEDIMENTS SPATIAL DISTRIBUTION, SEASONALITY AND CHARACTERISTICS OF ORGANIC MATTER". W International Conference on Coastal Sediments 2019. WORLD SCIENTIFIC, 2019. http://dx.doi.org/10.1142/9789811204487_0155.

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Raporty organizacyjne na temat "Estuarine sediments"

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Huettel, Markus. Transport of Gas and Solutes in Permeable Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2013. http://dx.doi.org/10.21236/ada605196.

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Huettel, Markus. Transport of Gas and Solutes in Permeable Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2009. http://dx.doi.org/10.21236/ada531009.

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Huettel, Markus. Transport of Gas and Solutes in Permeable Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2010. http://dx.doi.org/10.21236/ada541799.

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Huettel, Markus. Transport of Gas and Solutes in Permeable Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2011. http://dx.doi.org/10.21236/ada639807.

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Huettel, Markus. Transport of Gas and Solutes in Permeable Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2012. http://dx.doi.org/10.21236/ada572766.

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Sowers, Kevin R., i Harold D. May. Collaborative Research: Microbal Reductive Dechlorination of Polychlorinated Biphenyls (PCBs) in Estuarine and Marine Coastal Sediments. Fort Belvoir, VA: Defense Technical Information Center, marzec 2002. http://dx.doi.org/10.21236/ada400300.

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Li, Honghai, Carter Rucker, Lihwa Lin i Kevin Conner. Use of sediment tracers to evaluate sediment plume at Beaufort Inlet and Adjacent Beaches, North Carolina. Engineer Research and Development Center (U.S.), kwiecień 2024. http://dx.doi.org/10.21079/11681/48379.

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This report documents a numerical modeling investigation on the transport of sediment material placed on designated disposal sites adjacent to Beaufort Inlet, North Carolina. Historical and newly collected wave and hydrodynamic data around the inlet are assembled and analyzed. The data sets are used to calibrate and validate a coastal wave, hydrodynamic and sediment transport model, the Coastal Modeling System. Model alternatives are developed corresponding to different material placement sites. Sediment transport and sediment plume distribution are evaluated within and around the immediate vicinity of the Beaufort Inlet estuarine system for a representative summer and winter month. Results of model simulations show that high flows occur along navigation channels and low flows occur outside the inlet in open ocean area. Sand materials placed in nearshore sites tend to be trapped in and move along navigation channels entering the inlet. In offshore placement sites the sediment plume shows slow spreading and no significant sand migration from its release locations. Simulations for the summer and winter month present similar distribution patterns of sediments originating from placement sites.
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Li, Honghai, Carter Rucker, Lihwa Lin i Kevin Conner. Use of sediment tracers to evaluate sediment plume at Cape Fear River Inlet and Adjacent Beaches, North Carolina. Engineer Research and Development Center (U.S.), kwiecień 2024. http://dx.doi.org/10.21079/11681/48380.

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This report documents a numerical modeling investigation on the transport of sediment material placed on designated disposal sites adjacent to Cape Fear River Inlet, North Carolina. Historical and newly collected wave and hydrodynamic data around the inlet are assembled and analyzed. The data sets are used to calibrate and validate a coastal wave, hydrodynamic, and sediment transport model, the Coastal Modeling System. Model alternatives are developed corresponding to different material placement sites. Sediment transport and sediment plume distribution are evaluated within and around the immediate vicinity of Cape Fear River Inlet estuarine system for a representative summer and a winter month. Results of model simulations show that high flows occur along navigation channels and low flows occur outside the inlet in open ocean area. Sand materials placed in disposal sites tend to be trapped in and move along navigation channel and in these offshore placement sites sediment plume shows slow spreading and no significant sand migration from its release locations. Simulations for the summer and winter month present similar distribution patterns of sediments originating from placement sites.
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Canuel, Elizabeth A., Rebecca M. Dickhut i Steven A. Kuehl. The Role of Seabed Dynamics In Controlling the Distribution and Preservation of Polycyclic Aromatic Hydrocarbons (PAHs) in Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2000. http://dx.doi.org/10.21236/ada610015.

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Canuel, Elizabeth A., Rebecca M. Dickhut i Steven A. Kuehl. The Role of Seabed Dynamics in Controlling the Distribution and Preservation of Polycyclic Aromatic Hydrocarbons (PAHs) in Estuarine Sediments. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 2001. http://dx.doi.org/10.21236/ada626035.

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