Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Coastal sediments"”.
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Mechanisms of metal release from contaminated coastal sediments
The fate of trace metals in contaminated coastal sediments is poorly understood, yet critical for effective coastal management. The aim of this thesis is to investigate and quantify the mechanisms leading to the release of silver, lead and copper across the sediment-water interface. Two contrasting …
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Mechanisms of metal release from contaminated coastal sediments
The fate of trace metals in contaminated coastal sediments is poorly understood, yet critical for effective coastal management. The aim of this thesis is to investigate and quantify the mechanisms leading to the release of silver, lead and copper across the sediment-water interface. Two contrasting …
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Muddy affairs: Microbial methane cycling in anoxic coastal sediments
Contains fulltext : 326268.pdf (Publisher’s version ) (Closed access)
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Organic matter remineralization in coastal sediments in and around Kane‘ohe Bay, Hawaiʻi
… environments can be profoundly influenced by sediments, via the burial or release of nutrients through organic matter (OM) remineralization during diagenesis. The decomposition and burial of OM in sediments are key processes influencing biogeochemical cycles of nutrients (nitrogen, phosphorus) …
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Methane processes in the coastal sediments and water column of the Baltic Sea
… warming. In aquatic systems, microbes in anoxic sediments are the main methane producers. However, due to effective oxidative filters in the sediments and the water column, most of the methane produced does not end up in the atmosphere. This study explores methane dynamics in the Baltic Sea from …
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A Framework for Assessing Lower-Bound Bearing Capacity of Sandy Coastal Sediments from Remotely Sensed Imagery
… are particularly attractive for characterizing coastal sites, where both the strength properties and moisture content can change rapidly in response to tidal stages, wave runup, and storm events. To date, there have been limited investigations into the use of satellite-based data for …
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Selenium Distribution and Cycling in the Eastern Equatorial Pacific Ocean
… in situ or can be laterally advected from anoxic coastal sediments. However, using a combination of advection/diffusion modeling, particulate Se(0) data, and <sup>234</sup>Th-derived flux rates, the dissimilatory reduction of selenium was shown to mainly occur in situ, rather than via …
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High-Resolution Seismic Characterization of Shallow Sedimentary Structure for Freshwater Resources and Karstic Voids
… high-resolution characterization of near-surface coastal sediments, and the development of novel methodologies for subsurface void detection. The research integrates various geophysical measurements and numerical modeling to address these multifaceted objectives. First, the field performance of …
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Phosphate-mineral interactions and potential consequences for nutrient cycling
… key component in the overall production rate of coastal ecosystems. Mineral phases in the near-shore sediments play a significant role in the return of phosphate remineralized in the upper sediments to the water column. Sequential Extraction (SEDEX) of the solid-phase associated PO4-3 yielded …
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Phosphate-mineral interactions and potential consequences for nutrient cycling
… key component in the overall production rate of coastal ecosystems. Mineral phases in the near-shore sediments play a significant role in the return of phosphate remineralized in the upper sediments to the water column. Sequential Extraction (SEDEX) of the solid-phase associated P04-3 yielded …
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Carbon nanotube synthesis and detection : limiting the environmental impact of novel technologies
… methods were developed to quantify CNTs in coastal sediments down to 10 ug per sample, which is sufficient to for CNTs in laboratory air, but not sufficient to measure contemporary levels of CNTs in the environment (which were estimated to be present at pg g-1 sediment levels using a dynamic …
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Carbon nanotube synthesis and detection : limiting the environmental impact of novel technologies
… methods were developed to quantify CNTs in coastal sediments down to 10 ug per sample, which is sufficient to for CNTs in laboratory air, but not sufficient to measure contemporary levels of CNTs in the environment (which were estimated to be present at pg g' sediment levels using a dynamic …
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Microbial carbon sources on the shelf and slope of the northwestern Gulf of Mexico
… has been applied across diverse estuarine and coastal sediments, including lower Laguna Madre, TX, an oligotrophic, coastal lagoon dominated by a single OM source, seagrasses; shelf stations, a eutrophic coastal region receiving multiple sources of OM, hypoxic regions that occur seasonally and …
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The role of colloidal organic matter in the marine geochemistry of PCB’s
… which affect the speciation and fate of HOC in coastal environments. The focus of this study is on the sorption of PCBs with colloidal organic matter in seawater, and the influence of this process on the distribution of PCBs in coastal sediments. Laboratory and field experiments were used to …
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Dispersal and remineralisation of biodeposits: Ecosystem impacts of mussel aquaculture
… mineralisation was studied by incubating coastal sediments with added biodeposits and measuring oxygen and nutrient fluxes as well as sediment characteristics over an 11 d period. Sediment oxygen consumption and ammonium release increased immediately after biodeposit addition and remained …
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Distribution and behavior of trace metals in the subterranean estuary of an Arctic coastal lagoon
… and Ba) in the STE, lagoon surface waters, and coastal sediments of Simpson Lagoon along the Beaufort Shelf of Alaska. This location is unique among studies as the STE consists of organic-rich sediments. Samples were collected over two years and throughout seasonal water conditions, including …
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Distribution and behavior of trace metals in the subterranean estuary of an Arctic coastal lagoon
… and Ba) in the STE, lagoon surface waters, and coastal sediments of Simpson Lagoon along the Beaufort Shelf of Alaska. This location is unique among studies as the STE consists of organic-rich sediments. Samples were collected over two years and throughout seasonal water conditions, including …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
… Olleya and Tenacibaculum, were cultured from coastal sediments and found to be predatory on other bacteria on surfaces. Two published species of the genus Tenacibaculum were also observed to grow by lysis of prey bacteria, raising the possibility that predation may be a widespread lifestyle …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
… Olleya and Tenacibaculum, were cultured from coastal sediments and found to be predatory on other bacteria on surfaces. Two published species of the genus Tenacibaculum were also observed to grow by lysis of prey bacteria, raising the possibility that predation may be a widespread lifestyle …
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Late-quaternary environmental change at Eastbourne, East Sussex
… drilling rig, revealed extensive unconsolidated sediments down to a maximum depth of 33m. which consist of gravels, sand, silt and clay with restricted peat development. The history of the vegetation has been traced back to the Lateglacial when, it is argued, an unusually thermophilous community …
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