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 165 for “"total phosphorus"”.
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Suspended sediment and total phosphorus loadings from small agricultural watersheds in western Illinois
… continuous records of suspended sediment and total phosphorus concentrations at five watersheds in western Illinois. Due to the small drainage areas of the studied streams, all regression models were developed and applied using a 15-minute time-step. Four methods of constructing continuous …
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Using satellite hyperspectral imagery to map soil organic matter, total nitrogen and total phosphorus
… data for mapping soil organic matter (SOM), total nitrogen (N) and total phosphorus (P). Soil samples collected from Eagle Creek Watershed, Cicero Creek Watershed, and Fall Creek Watershed were analyzed for organic matter content, total N and total P; their corresponding spectral reflectance …
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Assessment of total phosphorus concentration as a predictor and determinant of fishery productivity in southern Appalachian reservoirs: application to Smith Mountain Lake, Virginia
Phosphorus is often the limiting nutrient of primary productivity in southern Appalachian reservoirs, but its impact on higher trophic levels has not been assessed. Regression analysis was used to examine the relationship between total phosphorus concentrations and estimates of fish standing stock …
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Šiaulių miesto paviršinių vandens telkinių ekologinės būklės įvertinimas /
… and Prudelis pond water quality tests, measured total phosphorus (Pb), total nitrogen (Nb) and chlorophyll „a“ concentration, water transparency. In research period the total phosphorus ranges from 0,031 mg/l to 0,084 mg/l. The biggest concentration of total phosphorus was found in Ginkunai lake, …
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Improving Estuarine Water Quality in South Florida: A Quantitative Evaluation of The Efficacy of a Local Nutrient Ordinance
… County Florida as a reference location. A total of twenty estuarine canal sampling locations were identified in both Lee and Broward Counties. The analysis used data spanning three years prior to (2007-2009) and post (2011-2013) the enactment of the ordinance. This study examined (1) the …
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Testing the use of the BASINS PLOAD model to simulate the quality of stormwater runoff from the Kuils River catchment, Cape Town
… affecting the quality of freshwater resources. Total phosphorus and total suspended solids represent two forms of pollutants that are commonly found in non point source discharge...This study evaluated water quality modelling as an alternative monitoring technique. The study was aimed at …
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Stormwater Treatment by Two Retrofit Infiltration Practices
… each BMP and analyzed for suspended sediment, total nitrogen, total phosphorus, fecal coliform bacteria and E-coli bacteria. The inflow and outflow concentrations and loads, as well as total inflow and outflow volumes and peak flow rates, were then compared to evaluate how well each BMP reduces …
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Long-term spatiotemporal water quality and phytoplankton dynamics in Severn Sound, Ontario: a delisted great lakes area of concern
… stations in water quality parameters such as total phosphorus, total nitrogen, Secchi disk visibility, and water temperature. Overall decreases in total phosphorus and chlorophyll a and increases in Secchi disk visibility illustrate the influences of nutrient reduction strategies, and …
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Production, characterization, and applications of biochar from olive processing byproducts
… including chemical oxygen demand (COD), total organic carbon (TOC), and total phosphorus. The lead adsorption efficiency of these biochar products was also assessed in lead nitrate solution, with kinetic models revealing adsorption mechanisms. Additionally, soil amendment trials were …
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Sediment Phosphorus Cycling in a Managed System Irondequoit Bay, N.Y.
The current status of internal phosphorus loading was evaluated in Irondequoit Bay, NY, an embayment of Lake Ontario. Sediment core incubation experiments and phosphorus water column profiles were used to quantify the release rate of phosphorus from the deepwater sediments of Irondequoit Bay during …
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Evaluation of Constructed Wetlands for the Waste Management of a Large Scale Swine Production Unit
… following: ammonia nitrogen, nitrate nitrogen, total phosphorus, total suspended solids, dissolved solids, dissolved oxygen, biological oxygen demand, and Fecal Coliform Bacteria. The wetland was divided into nine connected cells that covered approximately 3.8 hectares. Material was loaded from …
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An Examination of Trophic State Indices For Some Missouri Reservoirs
… abundance. A trophic state indicator based upon total phosphorus concentration is also discussed.
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Phosphorus biogeochemistry and models in estuaries: case study of the Southampton Water system
… and the major features of nutrients (nitrogen, phosphorus and silicon) and suspended particulate matter (SPM) thus obtained. Additionally phosphorus in pore waters, and the solid phase in sediments were measured. The forms of phosphorus in the solid phase of sediment (deposited and suspended) …
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Relating Land Use Factors to Phosphorus Runoff Concentrations within the Northrup Creek Watershed using GIS
… the correlation between land use variables and total phosphorus concentrations in storm events, (2) the ability of land use variables in predicting storm event runoff phosphorus concentrations, and (3) identifies specific high and low risk areas of phosphorus contribution throughout Northrup …
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Control of agricultural nonpoint source pollution in Kranji Catchment, Singapore
… conditions were analyzed for nitrogen, phosphorus, and bacterial species, as well as total suspended solids. High nutrient and bacterial concentrations were observed at sampling locations in the upstream region of the subcatchment, with total nitrogen as high as 19.8 mg/L, total …
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Ecorestoration of riparian forests for nonpoint source pollution control: Policy and ecological considerations in Illinois agroecosystem watersheds
… showed that concentrations of nitrate, dissolved phosphorus, and total phosphorus were not reduced in thirteen watersheds between 1986 and 1992 despite implementation of the CRP program. Average stream nitrate concentration between 1977 and 1992 (7.2 mg/L) was well above levels expected for …
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Assessment of sediment and water quality in Sembrong Reservoir, Johor
… testing for sediment samples consist of Total Nitrogen (TN), Total Phosphorus (TP) and sieve analysis for particle size distribution. For water samples, in-situ testing was conducted to test for the dissolve oxygen (DO), temperature and pH. Water transparency was tested by using Secchi …
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Load reduction and invasive mussel effects on eutrophication dynamics in Saginaw Bay, Lake Huron
<p>Phosphorus load reduction and dreissenid invasion are the two most important factors that influence europhication dynamics in the Great Lakes. The 1978 amendments to the Great Lakes Water Quality Agreement (GLWQA) between the United States and Canada established target phosphorus loads for the …
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