Дисертації з теми "Water Victoria Phosphorus content"
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Abou, Nahra Joumana. "Modeling phosphorus transport in soil and water." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102946.
Повний текст джерелаThe ability of the NICA model to describe phosphate (PO4) adsorption to soil particles was tested using soils collected from agricultural fields in southern Quebec. The surface charge and PO4 adsorption capacity of these soils were measured. Results were used to estimate the NICA model parameters using a non-linear fitting function. The NICA model accurately described the surface charge of these soils and the PO4 adsorption processes.
The HYDRUS-1D model was applied to simulate water flow and PO4 transport in re-constructed soil column experiments. The HYDRUS-1D model was calibrated based on physical and chemical parameters that were estimated from different experiments. Overall, the HYDRUS-1D model successfully simulated the water flow in the columns; however, it overestimated the final adsorbed PO4 concentrations in the soil. The discrepancies in the results suggested that the HYDRUS-1D model could not account for the differences in the soil structure found in the columns, or that the Freundlich isotherm could not adequately describe PO4 adsorption.
The HYDRUS-NICA model was calibrated and validated with results from re-packed column experiments. The simulated results were then compared with results obtained by the HYDRUS-1D model. The overall goodness-of-fit for the HYDRUS-1D model simulations was classified as poor. The HYDRUS-NICA model improved significantly the prediction of PO4 transport, with the coefficient of modeling efficiency values being close to unity, and the coefficient of residual mass values being close to zero. The HYDRUS-NICA model can be used as a tool to improve the prediction of PO4 transport at the field scale.
Simm, Robert. "Enhanced biological phosphorus removal using a sequencing batch RBC." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28517.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Coolidge, Kyle Marvin. "Phosphorus Cycling in Maine Lakes: A Sedimentary Analysis." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/CoolidgeKM2004.pdf.
Повний текст джерелаD'Angelo, Donna Jean. "Mechanisms governing phosphorus retention in streams." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39241.
Повний текст джерелаA, Heskett Richard. "Determining soil phosphorus concentrations using cattail indicators." Virtual Press, 1997. http://liblink.bsu.edu/uhtbin/catkey/1048396.
Повний текст джерелаDepartment of Biology
Yurk, Jeffrey J. "Assessment of total phosphorus concentration as a predictor and determinant of fishery productivity in southern Appalachian reservoirs: application to Smith Mountain Lake, Virginia." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/50103.
Повний текст джерелаMaster of Science
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Stämpfli, Nicolas. "The effect of water table management on the migration of phosphorus and on grain corn yields." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19763.
Повний текст джерелаShetterly, Benjamin James. "Soil Phosphorus Characterization and Vulnerability to Release in Urban Stormwater Bioretention Facilities." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4354.
Повний текст джерелаJamieson, Andrew 1976. "Evaluating phosphorus losses in surface and subsurface runoff from two agricultural fields in Quebec." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33784.
Повний текст джерелаTwo agricultural fields (the Marchand and Gagnon sites) located on the Pike River watershed, in southeastern Quebec were selected and equipped with instrumentation to measure and evaluate the partitioning of phosphorus between surface runoff and subsurface drainage, on a year round basis. The snowmelt event was the dominant surface and subsurface event for the 2000/2001 hydrological year. On the Marchand site surface flow data was incomplete as a result of a failure of the surface runoff flume. On both sites the IF 200 subsurface flow meters failed, which resulted in missing subsurface flow data during certain runoff events. Therefore, the majority of the comparisons made relate to the Gagnon site.
The 2000/2001 hydrological year was unusually dry, which resulted in a limited number of surface and subsurface runoff events. The annual depth of surface runoff for the Gagnon site was 87.5 mm/ha, of which only 0.2mm occurred outside the snowmelt event. The estimated depth of subsurface runoff of the snowmelt event at the Gagnon site based upon a water balance equation was 93.7 mm/ha, or 51.7% of the total volume that occurred on the Gagnon field during the snowmelt event.
The total phosphorus load in surface runoff for the spring snowmelt at the Gagnon site was 166.4 g/ha, whereas the estimated total phosphorus load in subsurface drainage was 98.2 g/ha, or 37.1% of the total load. Subsurface drains can therefore be a significant pathway for phosphorus losses.
Rooney, Neil. "Scale of analysis and the influence of submerged macrophytes on lake processes." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37665.
Повний текст джерелаStewart, Scott R. "Phosphorus loading in Baker Creek, Oregon." Thesis, 1992. http://hdl.handle.net/1957/36578.
Повний текст джерелаMayakaduwage, Sonia Samanthi. "Influence of pH, phosphorus addition and soil water content on phosphorus pools in acid sulfate soils." Thesis, 2020. http://hdl.handle.net/2440/128818.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food and Wine, 2020
Norris, Matthew. "Phosphorus sorption behaviour of some South African water treatment residues." Thesis, 2009. http://hdl.handle.net/10413/673.
Повний текст джерелаBlair, Michael Stuart. "Oregon coastal lake study : phosphorus loading and water quality implications." Thesis, 1993. http://hdl.handle.net/1957/36085.
Повний текст джерелаGraduation date: 1994
Erinle, Kehinde Olajide. "Effect of crop residue quality on phosphorus pools in the detritusphere and P uptake by wheat." Thesis, 2019. http://hdl.handle.net/2440/123091.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Agriculture, Food & Wine, 2019
Nowlin, Weston Hugh. "Phosphorus dynamics in coastal and inland lakes and reservoirs in British Columbia with special reference to water level fluctuation and climate variability." 2003. http://hdl.handle.net/1828/346.
Повний текст джерелаPeterson, Heidi Marliese. "Hybrid cattail (Typha x glauca) growth and nutrient content along a water depth gradient in two prairie marshes." 2015. http://hdl.handle.net/1993/30838.
Повний текст джерелаOctober 2015
Johnstone, Joseph A. "Nitrogen, Phosphorus and Carbon Dynamics during Storms in a Glaciated Third-Order Watershed in the US Midwest." Thesis, 2013. http://hdl.handle.net/1805/3460.
Повний текст джерелаThe characterization of the nutrients nitrogen, phosphorus and carbon (NPC) export to streams during storms is an integral part of understanding processes affecting water quality. Despite the fact that excessive levels of these nutrients in the Mississippi River basin adversely affects water quality in the Gulf of Mexico, little research has been conducted on NPC dynamics during storms on larger (>20 km2) agriculturally dominated Midwestern watersheds. This project examined the storm export of nitrate, ammonium, total phosphorus, and dissolved organic carbon (DOC) in the upper Eagle Creek Watershed (UECW) (274 km2) in Central Indiana, USA. Water samples were collected during five winter and spring storms in 2007 and 2008 on the rising and falling limb of the hydrograph, in order to characterize NPC dynamics during storm events. Stream discharge and precipitation was monitored continuously, and major cations were used to examine changes in source water over the duration of the storm and assist in the determination of potential flowpaths. DOC, total P, and TKN (Total Kjeldahl Nitrogen) tended to peak with discharge, while nitrate usually exhibited a slight lag and peaked on the receding limb. Total phosphorus, NH3-, TKN, and DOC appear to be delivered to the stream primarily by overland flow. NO3--N appear to be delivered by a combination of tile drain and macropore flow. Overall UECW displayed smoother nutrient export patterns than smaller previously studied watersheds in the area suggesting that scale may influence nutrient export dynamics. Further research is underway on a 3000 km2 watershed in the area to further examine the role scale may play in nutrient export patterns.
Adams, Geoffrey. "Development of a simple hydrological modelling methodology for estimating phosphorus generation from rural land." Phd thesis, 2010. http://hdl.handle.net/1885/150832.
Повний текст джерелаGopinath, Raju. "Modeling the impact of buffer strips on phosphorus concentration in Buck Creek Watershed, Indiana : a GIS approach." 2010. http://liblink.bsu.edu/uhtbin/catkey/1629786.
Повний текст джерелаDepartment of Geography
Liu, Qianhe. "Rhizosphere processes influencing soil and fertilizer phosphorus availability to Pinus radiata : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Soil Science at Massey University, Palmerston North, New Zealand." 2005. http://hdl.handle.net/10179/1669.
Повний текст джерелаLiu, Xiaoqiang. "Coupled biogeochemical cycles in riparian zones with contrasting hydrogeomorphic characteristics in the US Midwest." Thesis, 2013. http://hdl.handle.net/1805/3756.
Повний текст джерелаNumerous studies have investigated the fate of pollutants in riparian buffers, but few studies have focused on the control of multiple contaminants simultaneously in riparian zones. To better understand what drives the biogeochemical cycles of multiple contaminants in riparian zones, a 19-month study was conducted in riparian buffers across a range of hydrogeomorphic (HGM) settings in the White River watershed in Indiana. Three research sites [Leary Webber Ditch (LWD), Scott Starling (SS) and White River (WR)] with contrasting hydro-geomorphology were selected. We monitored groundwater table depth, oxidation reduction potential (ORP), dissolved oxygen (DO), dissolved organic carbon (DOC), NO3-, NH4+, soluble reactive phosphorus (SRP), SO42- , total Hg and methylmercury (MeHg). Our results revealed that differences in HGM conditions translated into distinctive site hydrology, but significant differences in site hydrology did not lead to different biogeochemical conditions. Nitrate reduction and sulfate re-oxidation were likely associated with major hydrological events, while sulfate reduction, ammonia and methylmercury production were likely associated with seasonal changes in biogeochemical conditions. Results also suggest that the LWD site was a small sink for nitrate but a source for sulfate and MeHg, the SS site was a small sink for MeHg but had little effect on NO3-, SO42- and SRP, and the WR was an intermediate to a large sink for nitrate, an intermediate sink for SRP, and a small source for MeHg. Land use and point source appears to have played an important role in regulating solute concentrations (NO3-, SRP and THg). Thermodynamic theories probably oversimplify the complex patterns of solute dynamics which, at the sites monitored in the present study, were more strongly impacted by HGM settings, land use, and proximity to a point source.