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 47 for “"Sediment traps"”.
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Marine Snow Settling Velocities at an Oil Spill Site and a Control Site in the Northern Gulf of Mexico
… redistribution of particles near the seafloor, sediment traps, marine snow cameras, and acoustic Doppler current profilers (ADCPs) were deployed at two sites below the continental shelf break. One site was underneath the oiling footprint near the location of the Deepwater Horizon wellhead and …
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Tracking Changes In Silicon Isotopic Composition During Diatom Descent and Dissolution In the Cariaco Basin.
… The Cariaco Basin time series consists of four sediment traps at progressively greater depths on a single mooring and monthly hydrographic and dissolved nutrient measurements within the water column. Monthly measurements of diatom δ<super>30</super>Si from sediment traps between 225-m and 1200-m …
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The influence of differential production and dissolution on the stable isotope composition of planktonic foraminifera
Planktonic foraminifera from plankton tows, sediment traps and sediments from the central North Atlantic were studied in order to understand how they acquire their oxygen and carbon isotope compositions. Shallow dwelling planktonic foraminifera (mostly spinose species), collected in plankton tows …
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Spatial Distribution of Fine Sediment and Juvenile Freshwater Mussel Settling in the Gravel Bedded Dan River, North Carolina
Fine sediment plays an important role in the benthic habitat and water quality of gravel bed rivers. Fine particles, such as sand and silt, are often suspended in the channel but can settle into the bed during low flows. The deposition of these particles is dependent on the bathymetry of the river …
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Chlorophyll diagenesis in the water column and sediments of the Black Sea
… of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, and at two locations in surface sediments. Individual chlorophyll degradation products are also identified. This data is used …
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Improved dynamics modelling for drainage sediment prediction and management
… in this thesis aims to further knowledge of sediment behaviour and provides engineers with appropriate tools and methods to facilitate proactive sediment management. The techniques developed during this investigation are therefore able to predict the locations and quantities of sediment …
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Variations in the particulate flux of ²³⁰Th and ²³¹Pa and paleoceanograhpic applications of the ²³¹Pa/²³¹Th ratio
… of sinking particulate matter collected with sediment traps and in deep-sea sediment cores. New analytical methods for uranium, thorium, and protactinium isotopes by Inductively-Coupled Plasma Spectrometry (ICP-MS) with a conventional Meinhard concentric glass nebulizer were developed. …
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Advances in measurements of particle cycling and fluxes in the ocean
… Next, neutrally buoyant and surface-tethered sediment traps were compared during a three-year time series in the subtropical Atlantic. This study suggested that previously observed imbalances between carbon stocks and fluxes in this region are not due to undersampling by traps. To assess …
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Advances in measurements of particle cycling and fluxes in the ocean
… Next, neutrally buoyant and surface-tethered sediment traps were compared during a three-year time series in the subtropical Atlantic. This study suggested that previously observed imbalances between carbon stocks and fluxes in this region are not due to undersampling by traps. To assess …
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Characterization, Treatment, and Improvement of Aquacultural Effluents
… that the solids removal efficiency of farm sediment traps were very low, and after a certain period of time, they reached capacity due to particle scouring. A pilot plant was constructed in the water and sludge treatability phase to prove a baffled settling scheme was sufficient to treat …
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Particle export and flux through the Mesopelagic in the high-latitude north and South Atlantic
… spring diatom bloom was tracked using Lagrangian sediment traps and thorium-234 disequilibria. A large pulse of diatom detritus was exported suddenly at the end of the bloom, probably upon impending Si-limitation. The particles were rich in transparent exopolymer particles (TEP, sticky …
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Microbial diversity and groundwater chemistry in a pristine aquifer
… cells suspended in groundwater and trapping sediment-bound populations on sterile samplers incubated in the wells themselves. After extracting DNA directly from these samples, we characterized both the suspended and attached communities with terminal restriction fragment length polymorphism …
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Spatial and temporal variability in floodplain sedimentation during individual hydrologic events on a lowland, meandering river: Allerton Park, Monticello, Illinois
Floodplains are major sinks and sources for sediment within the fluvial system and are constructed through two main processes: lateral and vertical accretion. In fine grained systems, vertical accretion dominates. Overbank flooding and floodplain inundation are dependent on bank height and local …
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Composition and characteristics of particles in the ocean : evidence for present day resuspension
… in the water column and the underlying surface sediments verifies the occurrence of local, present-day resuspension in the deep sea. The location of the major portion of this work was the South Iceland Rise, a region influenced by the flow of Norwegian Sea Overflow Water. Measured current …
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The marine geochemistry of thorium and protactinium
Suspended particulate matter was collected by sediment traps deployed in the Sargasso Sea (Site S2), the north equatorial Atlantic (Site E), the north equatorial Pacific (Site P), and the Panama Basin (STIE Site). Additional samples of suspended particles were obtained by in situ filtration at Site …
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The Influence of The Burrowing Mammal Tamias Striatus on The Soil Creep Process
… t-bars and Young pits respectively. Surface sediment transport was monitored with the use of sediment traps. Data on soil moisture, soil temperature, and precipitation were also collected. Mean soil creep rates for the 0.0 to 10.0 centimeter depth interval were calculated at 0.0 mm/yr (+OR-) …
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Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle
… Pacific-Pi and Panama Basin-PB) using PARLUX sediment traps in moored arrays at several depths. The taxonomic diversities of the radiolarian assemblages in the sediment traps were very high. A total of 420 taxa, including 23 newly identified taxa, were found at the three stations; of these, …
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Vertical flux, ecology and dissolution of radiolaria in tropical oceans : implications for the silica cycle
… Pacific-P1 and Panama Basin-PB) using PARFLUX sediment traps in moored arrays at several depths. The taxonomic diversities of the radiolarian assemblages in the sediment traps were very high. A total of 420 taxa, including 23 newly identified taxa, were found at the three stations; of these, …
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Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen
… consistent with independent measurements from sediment traps and isotopic data. Net nutrient sources or sinks are found in several regions, suggesting either transport of dissolved organic matter or a seasonal alias. Oxygen indicates large exchanges with the atmosphere, with intake at high …
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Anomalous carbonate preservation in the abyssal North Pacific, ODP sites 882 and 1179: planktonic foraminiferal analysis, climate change and palaeogeomagnetism /
… although similar to those collected in nearby sediment traps, have a slightly lower diversity, and are enriched in thick walled, non-spinose taxa. Abundance peaks of foraminifera throughout the cores agree well with the timing of brief suppression of the calcite compensation depth. These …
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