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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 61 for “"Sediment-water Interface"”.
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Turbulence In Low Energy Lacustrine Environments At The Sediment-Water Interface
The sediment-water interface is an important region where biological, chemical, and physical processes occur. Fluid flow determines the ability of organisms to utilize the bottom sediments for food, shelter, and reproduction, the amount and rate of mass transfer between the sediment and bulk fluid, …
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Metal fluxes across the sediment water interface in a drinking water reservoir
… of iron (Fe) and manganese (Mn) in drinking water degrade water quality by affecting taste, odor, and color. Under oxic conditions (dissolved oxygen (DO) >2 mg/L), Fe and Mn are rarely present in soluble form in natural waters, as they occur as insoluble, oxidized minerals in sediments. …
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Dynamic forcing of oxygen, iron, and manganese fluxes at the sediment-water interface in lakes and reservoirs
… a more interdisciplinary approach to drinking water research to address the critical issue of global drinking water supplies. Hypolimnetic oxygenation systems (HOₓ) are being increasingly used to improve water quality in stratified reservoirs by increasing dissolved oxygen (O₂) concentrations …
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Development of sediment oxygen demand predictive model by characterization of oxygen mass transfer at sediment-water interface
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Influence of light and algae on nutrient transformations at the sediment-water interface of an agricultural stream
The sediment-water interface is an active biogeochemical zone within streams, where solutes come in contact with mineral surfaces, biota, and reducing conditions. Here, we sought to examine the influence of light, the sediment water interface, and algae on dissolved organic carbon (DOC), nitrogen, …
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Investigations on the Phenomena of Accumulation and Mobilization of Heavy Metals and Arsenic at the Sediment-Water Interface by Electrochemically Initiated Processes
… and municipal effluents are discharged. Aquatic sediments/environments are often polluted by heavy metals due to the temporal variations in anthropogenic input of contaminants via atmospheric deposition, catchment runoff, effluent inflow and dumping from industrial transportation, mining, …
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An Investigation into the Effects of an External Electron Acceptor on Nutrient Cycling at the Sediment-Water Interface of the Occoquan Reservoir
Water supply reservoirs are often subject to accelerated nutrient enrichment from urban sources. Cultural eutrophication due to such enrichment requires the development of efficient management and remediation strategies to protect drinking water sources. This study investigates the effects of using …
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A finite element model of submarine ground water discharge to tidal estuarine waters
In the research presented here, a new ground water model, FEMCoast, was developed to simulate ground water discharge to the intertidal zone of estuarine systems. This research may be the first attempt to model the ground water discharge process in a tidal estaurine system. The development of FEM …
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A mathematical model of the nitrogen cycle in a constructed wetland
… utilizes nitrogen concentrations of influent water as system inputs. The model is three-dimensional, one dimensional in time, and two dimensional in space. The physical domain of the model incorporates a flat emergent marsh and deep pool and includes the water body and underlying sediment. …
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Phytoplankton community structure response to groundwater-borne nutrients in the Inland Bays, DE
… experiments to determine the impacts of groundwater-borne nutrients on biomass and response in community structure of phytoplankton. To assess the impacts of groundwater-borne nutrients, we measured chlorophyll a concentrations as a proxy for overall biomass and used genetic sequencing …
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Enhancement of fine particle deposition to permeable sediments
… roughness, but no direct tests involving flat sediment beds. Understanding the mechanisms at work for flat sediment beds would provide the basis for exploring more complicated bed conditions and the incorporation of other transport processes, such as bioturbation and bedload transport. …
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Carbon and nitrogen cycling in vegetated coastal ecosystems
… (e.g., shallow depths, organic matter rich sediments, etc.). My dissertation addresses the role of vegetated coastal ecosystems in greenhouse gas budgets and biogeochemical cycling. In Chapter 1, I conducted a meta-analysis to quantify the global emissions of CH4 from mangrove, salt marsh, …
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Benthic oxygen exchange across soft and hard bottoms using the new Eddy Correlation technique: Case studies from the tropics to the Arctic
Marine sediments play an important role in the global carbon cycle, where they are ultimately important for recycling of carbon. At the sediment-water interface carbon is in constant movement both into and out of the sediment. However some environments are more important for the natural storage of …
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Environmental Stressors: Pathways Of Exposure And Aquatic Invertebrate Response
<p>The need to monitor freshwater and detect impairments prior to observable impacts is crucial to maintain species diversity and ecosystem function. Therefore, understanding the contribution of various matrices (i.e., sediment and water) to chemical exposure is critical for remediation of impacted …
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Radium isotopes and radon-222 as tracers of sediment-water interaction in Arctic coastal and lacustrine environments
… These changes are especially important at the interface between sediments and surface waters because they are hotspots for biogeochemical transformations such as redox reactions, nutrient consumption and regeneration, organic matter leaching and degradation, and mineral weathering. Radium …
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Stable isotope geochemistry of nitrogen in marine particulates
… organic matter (POM) during its residence in the water column and after deposition on the seafloor. The processes focused on were water-column transformations and sedimentary diagenesis. Sampling sites were chosen to provide POM subject to different specific mineralization processes …
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The biogeochemistry of 210Pb and 210Po in fresh waters and sediments
… cycling of 210Pb in lakes, including the water column, sediments, and their interactions with each other. A special goal was to elucidate processes that might influence the distribution and fluxes of the radionuclide in ways that could effect 210Pb sediment dating. A mass balance for the …
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Análisis Ecotoxicológico Integrado de la Contaminación Marina en los Sedimentos de la Costa De Murcia: El Caso de Portmán, Sudeste - España
… the most seriously heavy metal contaminated sediments of the Mediterranean Sea. From 1958 to 1991, approximately 50 million tons of mine tailings were dumped into the bay, completely filling up the bay and dispersing over an extensive area of the continental platform and continental slope. …
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An introduction to the study of phosphorus dynamics in Rondevlei
… nuisance plants, which have negative impacts on waterbodies. Urban runoff and sediment fall under various sources of phosphorus. Sediments act as sources as well as phosphorus storage tanks. Processes of adsorption and desorption which occur -at the sediment water interface make phosphorus …
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Aspects of the biogeochemistry of carbohydrates in aquatic environments
… studied: what is the carbohydrate composition of sediment in different environments (e.g., deep-sea oxic; shallow-sea oxic; deep-sea anoxic; fresh-water anoxic; brackish-water anoxic, etc.)? How does the environment at the sediment-water interface affect the composition of the carbohydrate input? …
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