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 73 for “"accumulation rates"”.
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Establishing geochemical constraints on mass accumulation rates across the Cretaceous-Paleogene boundary with extraterrestrial Helium-3
… boundary because of fluctuating sedimentation rates and the short duration of the event. In this study, we have used extraterrestrial helium-3 as a constant flux proxy for instantaneous mass accumulation rates in four marine sections: Caravaca, Spain; El Kef, Tunisia; and Hojerup and …
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A Reconstruction of Post-Glacial Hydroclimatic Change and Mass Accumulation Rates from a Small Watershed of the Lower North American Great Lakes Region
… evidence over the last ~14,700 cal years illustrates numerous fluctuations over a range of 3.5 m that reflect changing hydroclimatic conditions. Four lowstands of at least 1.5 m below the modern lake level are recorded, which were caused by some combination of reduced warm-season precipitation, …
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Carbon Accumulation Rates Over the Holocene in Flow Country Peatlands and the Direct Comparison of Open and Afforested Peatland Carbon Stocks Using Tephrochronology
… the accuracy of our paleoecological carbon accumulation estimates. The ubiquitous nature of some of these tephra suggest this study could be replicated across the north of Scotland. Along with the chronology, carbon content and bulk density data were then used to compare stocks between …
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Quantifying Sedimentation Patterns of Small Watersheds in the Central Oregon Coast Range Using Landslide-Dammed Lakes
… should increase linear and mass sediment accumulation rates and be discernible spatially and temporally in the sediment record with use of <sup>137</sup>Cs, high resolution charcoal stratigraphy, and aerial photography. Klickitat Lake and Wasson Lake are landslide-dammed lakes in small …
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Seasonal and long-term change in the abundance, accumulation and distribution of beach litter within Table Bay, Cape Town, South Africa
… by marine debris and plastics. The daily accumulation rates of stranded beach litter were measured at two sites within Table Bay, repeating similar studies from 1994/95 and 2012. Milnerton is a popular recreational beach near the city, while Koeberg is a seldom visited beach in a nature …
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Sedimentation on a mixed siliciclastic/carbonate continental margin over decadal to millennial timescales: Gulf of Papua
… to estimate particle flux and sediment mass accumulation rates on multiple timescales. Patterns of sediment mass accumulation and inventory-derived 210Pb fluxes display regional variations, decreasing seaward, and along isobaths seaward from the northeastern shelf edge. The amount of …
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An Analysis of Beach Debris Accumulation in Table Bay, Cape Town, South Africa
… is closed to public access. Daily and weekly accumulation rates were measured for both sites. A total of 40 041 items were collected, of which 81.7 % was plastic. Half of this was styrofoam. The majority of the debris was related to floating recreational litter, packaging material and …
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Spatial and temporal dynamics of fire and vegetation change in Thunder Creek watershed, North Cascades National Park, Washington
… of steep environmental gradients, slow rates of forest succession, frequent fire, and other disturbances maintain a diversity of species assemblages and structures. The second study reconstructed a Holocene fire and vegetation history at a montane site from lake sediment charcoal, …
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Assessing changes in pollen assemblage and charcoal accumulation during known changes in climate from c. 5,400 to 3,300 Years Before Present at the forest-prairie ecotone in Alberta, Canada
… both the percent relative abundance and influx rates of pollen taxa found in a sediment core from Chauvin Lake. Variation in sediment charcoal accumulation rates for both total charcoal and morphotypes, as well as the percent relative abundance of charcoal morphotypes, were used to infer changes …
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Stream aufwuchs accumulation
I investigated the Aufwuchs accumulation process on glass slides (chlorophyll, adenosine triphosphate, and diatoms) in experimental streams near Glen Lyn VA (Phase I) and in Stroubles Creek near Blacksburg VA (Phase II). Depopulation experiments carried out during Phase I supported my hypothesis …
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The abundance, distribution and accumulation of plastic debris in Table Bay, Cape Town, South Africa
… and is 27 km farther from the city. Daily accumulation rates of manufactured items (>1 cm diameter) were measured at both beaches for ten days in October, November and December 2012. Of the 124,646 items collected, 93% were made of plastic, but these items comprised only 59 % of the total …
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The tropical peatland carbon sink: climatic drivers and modelling of peat accumulation at the pan-tropical scale
… the climatic and environmental drivers of carbon accumulation and about the future of the carbon sink with climate change. There are also relatively few modelling studies focusing on the tropical peatland carbon sink because of limited available data for parameterisation and validation, and …
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Geomorphic Analysis of A Rural Fluvial System During Pre-Dam Removal Conditions: A Case Study In Eastern Virginia
… supply (CRS) model. Estimated average sediment accumulation rates for Core 1 are 0.1665 (SR) and 0.1882 g cm-2yr-1 (CRS), and for Core 2 are 0.1335 (SR) and 0.1725 g cm-2yr-1 (CRS). Linear regression of excess 210Pb and cumulative mass depth using SR data and change in CRS and SR-derived …
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Distribution of post-Last Glacial Maximum Sedimentary Deposits in the Amundsen Sea, Antarctica, from Subbottom Seismic Profiles
… sediment deposits to determine sediment accumulation patterns across the Amundsen Sea. A concentration of high average sediment deposit thickness is seen in areas lacking streamlined geomorphology, specifically proximal to the Eastern Ice Shelf. Geomorphic basin extent and sediment …
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The oceanography, the biogeochemistry and the fluxes of carbon dioxide in the Benguela Upwelling System
… primary production and sediment organic carbon accumulation rates, an important CO₂ sink. ■ The carbon export flux and the magnitude of the CO₂ sink in the Benguela System can be predicted from the C:N stoichiometry provided by the Redfield Ratio. ■ The inorganic carbon pump through …
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Carbon dynamics in restiad peatlands across different timescales
… CO₂ fluxes and down-core measurements of carbon accumulation to study the drivers of peatland carbon exchange across a wide range of timescales. First of all, we compare contemporary CO₂ fluxes at two raised bogs, one of which is extremely dry in an international context (Moanatuatua), with the …
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Examining Coastal Marsh Sedimentation In Northeastern North Carolina
… short-term deposition relative to decadal-scale accumulation and assess whether two marshes in northeastern North Carolina were maintaining their systems relative to sea-level rise. It was determined that deposition is highly influenced by marsh geomorphology, with higher deposition rates along …
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Combined Anaerobic/Aerobic Treatment for Municipal Wastewater
… this research is to quantify the SS removal and accumulation rates in the AFBR, and determine the degree of stabilization of solids in the unit. All this to demonstrate the feasibility of avoiding separate sludge stabilization units.
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A multiplex platform based on cellular barcoding for measuring single cell drug susceptibility
… have been used to measure single-cell mass accumulation rates over ~20 minute intervals to assess drug susceptibility. Here, we present a multiplexing platform that allows evaluation of multiple drug response conditions in a single experiment by utilizing fluorescent barcodes based on cell …
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Alluvial Sedimentation Associated with Logging in Low Gradient Watersheds in DeSoto National Forest, Mississippi
… hillslope stability, and increase sedimentation rates in local streams and rivers. The aim of this research is to determine if forestry removal causes an increase of soil erosion and how it affects floodplain sedimentation in the low gradient watershed Whiskey Creek, located in DeSoto National …
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