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 77 for “"Dry periods"”.
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Emissions From Concentrated Animal Feeding Operations During Wet and Dry Periods in the Southeastern United States
… from these sources would differ between wet and dry periods over the CAFO locations. In this thesis, point emissions from locations representing CAFOs in western Kentucky and the transit of SO<sub>2</sub>throughout the southeastern U.S. were simulated in multiple sensitivity experiments using the …
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Expected impacts of climate change on water and wastewater treatment in the Eastern Ontario region
… based on the existing CAPDET software. Dry periods, heavy rain events, heavy spring runoff and increased temperatures are the critical climate change phenomena that are expected to have the greatest impact on the water infrastructure of the study area. It was found that WTPs on the …
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Determining Sources of Fecal Pollution in Water for a Rural Virginia Community
… were positive appeared primarily during very dry periods. Restricting livestock access to streams can dramatically lower fecal coliform counts during the unusually hot and dry periods. Reducing FC counts to below recreational water standards for Virginia (1000 per 100ml for any one sample) may …
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Evaluation of Nutrients and Suspended Solids Removal by Stormwater Control Measures Using High Flow Media
… and nitrification of dissolved N species during dry periods led to nitrate export. HFM grain size and organic content did not significantly impact TSS or P removal, but higher organic content was associated with higher N removal. FF was present in TSS (strongest), TN, and TP (weakest). Optimal …
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Drought tolerance and implications for vegetation-climate interactions in the Amazon forest
… of tropical forest to withstand warming and drying leads to replacement of forest by savanna by 2050. The main questions of this research are: What factors affect forest drought tolerance, and what are the implications of drought tolerance mechanisms for climate? Forest adaptations to …
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Sausrų ir sausų laikotarpių Lietuvoje analizė /
… aim of the study – the analysis of droughts and dry periods and their dynamics according to various drought indices. In this thesis SPI, HTC and SRI drought indexes were used. In Lithuania and the Baltic Sea region, the total number of the droughts identified using the SPI is decreasing, but the …
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Multi-sensor large scale land surface data assimilation using ensemble approaches
… soil and vegetation variability after prolonged drydown. This is confirmed by SVD of the replicate matrix produced in an ensemble forecasting experiment. Local EnKF's are suitable for problems during dry periods but give less accurate results after rainfall.
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A geohydrological assessment of the behaviour and response of the Zululand coastal plain to both environmental influences and human activity
… 1973 to 1990. During this period both wet and dry climatic conditions were experienced, and in 1981 a plantation covering 1100 ha was established. In order to clarify the magnitude and variability of hydrological parameters under natural and under altered conditions, comparisons were made …
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Process Modeling of Trihalomethanes During Aquifer Storage and Recovery
… injecting treated water underground during wet periods and recovering water during dry periods. Trihalomethanes are the most common disinfection by-products found in chlorinated water, a result of chlorine reacting with dissolved organic matter, and are linked to adverse human health effects. …
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Low-level feeding of ronnel in a mineral salt mixture for area control of the face fly, Musca autumnalis deg. (Diptera: Muscidae)
… control was above 95 percent. (3) During hot, dry periods animals reduced their salt consumption and this resulted in decreased larval control. (4) When salt boxes were placed in areas where cattle were seldom seen to frequent, salt consumption was lowered, as was larval control.
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Stormwater-borne pollutant export from turfgrass established on soils amended with composted domestic wastewater sludges
… and crop, sustain plant growth during excessive dry periods, improve the quality of the crop, reduce runoff, and reduce soil erosion. The export of all pollutants was reduced by the use of compost. The use of fertilizer in combination with the compost did not provide any observable benefit. …
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Quantification of Airborne Fungal Spores Comparing Molecular Tracers via Ion Chromatography and UV-LIF Methods
… fungal tracers increased 3 fold during rainy periods in comparison to dry periods consistent with the increase of atmospheric fungal spores during times of increased relative humidity. Application of a thresholding scheme suggested by Savage et al. (2017) eliminated lowly fluorescent particles …
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Evaluation of a Water Budget Model for Use in Wetland Design
… not accurately predict drawdown occurring during dry periods. Results showed that the Wetbud advanced module produced more accurate and detailed results when compared to the basic module: Nash-Sutcliffe model efficiency ratings for the advanced module ranged from to 0.44 to 0.63. Potential …
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Phosphate stabilisation of partly oxidised, polyminerallic mine wastes
… efflorescences which have built up during dry periods, resulting in ‘first flush’ acid (pH 2.6–3.8) waters with elevated sulphate, Fe, Cu and Zn contents. Less soluble efflorescences, such as anglesite and plumbojarosite, retain Pb in the waste dump. Metal-rich (Al, Cd, Co, Cu, Fe, Mn, Ni, …
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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
… area that has been subject to periods of enhanced aridity occurring at multi-decadal to centennial-scale cycles throughout much of the last 6000 years. To assess the ecotonal response to changes in effective moisture, as inferred by diatom-inferred salinity, temporal variations …
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A multi-city analysis of the natural and human drivers of the urban heat island
… the magnitude of the heat island during hot or dry periods of 1.0 °C or more during the daytime and 2.0 °C at night relative to cool or humid periods. The heat wave results are of particular note due to the added stress on urban residents during periods when the population is already at …
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Effects of climate and forest management on the water and nitrogen status of European beech regeneration and understorey vegetation
… is expected. Extreme events, such as hot and dry periods, would increase in frequency and duration in near future. Due to the low adaptive capacity of forest ecosystems to rapid climate changes, high priority is given to the assessment of their responses. Particularly, studies on forests …
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Revisiting the links between the Southern Annular Mode and rainfall over the Western Cape region of South Africa
… variability and prevalence to prolonged dry periods. Although not completely understood, a wide range of factors have been highlighted to contribute to this interannual variability. The relatively poor understanding of rainfall variability in this region is of concern considering the low …
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Quantifying glacier melt enhancement due to dust deposition during the 2022 melt season. Tungnaárjökull glacier, South Iceland
… controlled by high velocity winds and prolonged dry periods. Additionally, Icelandic mineral dust contains high amount of iron and iron oxides which makes it extremely light absorbing. An extensive dust event occurred over the southwest outlets of Vatnajökull ice cap during early July of 2022 …
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