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 43 for “"Runoff Generation"”.
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Modelling runoff generation and connectivity for semi-arid hillslopes and small catchments
The processes relating to runoff generation in a semi-arid environment at the hillslope scale are poorly understood. This research considers the amount and origin of water reaching the channel during a storm event using a combination of field experiments and computer simulation techniques. From the …
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The influence of urbanization on runoff generation and stream chemistry in Massachusetts watersheds
… flow paths during rainfall events in stormflow generation in a small urban catchment. The percentage of residential land explains 52% of the variability in mean annual nitrate (NO3) concentrations in headwater catchments of the Ipswich River watershed, but is not correlated with mean annual …
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Old and subsurface water contributions to storm runoff generation in flat, fractured, clayey terrain.
… old and subsurface water contributions to storm runoff generation in flat, fractured, clayey terrain with integrated tracer studies and field measurements. This study was conducted at Agriculture Canada's Whelan Experimental Farm near Woodslee, Ontario between June 1992 and August 1993. The study …
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Patterns of water table dynamics and runoff generation in a watershed with preferential flow networks
… velocity, discharge, water table dynamics, and runoff response. In this thesis, three chapters explore some of these patterns for a hillslope and small watershed in coastal British Columbia. In the first chapter, tracers were applied under natural and steady state conditions to determine the …
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Hydrological processes in volcanic ash soils : measuring, modelling and understanding runoff generation in an undisturbed catchment
… in mountainous environments are controlled by runoff generation processes in the basin upstream. Runoff generation processes are thus a major control of the terrestrial part of the water cycle, influencing both, water quality and water quantity as well as their dynamics. The understanding of …
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Conceptual, algorithmic, and statistical exploration of relations between runoff generation, stream geomorphology, and watershed topography in West Texas
… analyses. 3. The Effect of Terrain Ruggedness on Runoff Generation and Flood Magnitude This chapter constitutes a study of the influence of both terrain ruggedness and areal proximity on flood magnitude. Discussion and conceptualization of the influence on the runoff process of parts of a …
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A Hydropedological Approach to Describing Runoff Generation, Lateral Podzolization, and Spatial and Temporal Patterns of DOC in a Headwater Catchment
… these findings will be useful to better explain runoff generation, soil formation, and DOC export from headwater catchments. Headwater streams source water to larger bodies of water that are valuable natural resources. Therefore, explaining these processes is critical to predicting and responding …
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Modelling the hydrological response of an urban watershed Diachronic analysis of the effects of land use changes on storm runoff generation in the Upper Bukit Timah basin, Singapore
… work consisted in the modelling of the rainfall-runoff relationships in the Upper Bukit Timah catchment in Singapore, in order to highlight the impacts of urbanisation on hydrology. The SWMM model, a one-dimensional physically based model especially developed for urban areas, was mainly used. The …
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Meteorological Impacts on Streamflow: Analyzing Anthropogenic Climate Change's Effect on Runoff and Streamflow Magnitudes in Virginia's Chesapeake Bay Watershed
… Program (CBP). Trends are compared with surface runoff generation patterns for a variety of land uses to investigate climate's effect on runoff generation. Scenarios representing pairings of the tenth, fiftieth, and ninetieth percentiles of precipitation and temperature in the CBP 31-model …
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Quantification of wildfire-induced perturbations to soil-water retention curves and their impact on rainfall runoff
… wildfires can cause elevated post-fire rainfall-runoff and debris-flow hazards in and around steeplands. Improved prediction of the severity and spatial extent of post-fire increases to these hazards requires understanding which soil properties are most strongly affected by wildfire and what role …
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Quantifying the impacts of climate and land use changes on the hydrological response of a monsoonal catchment
… effect of climate change and land use change on runoff generation and flooding has received great attention in many hydrological modelling studies. However, currently many hydrologists are still uncertain how much these two factors contribute to runoff generation, particularly in monsoon …
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Evaluation of the effectiveness of BMP's for urban stormwater management: single-event simulation
… response to a rainfall event in terms of runoff generation and to estimate nonpoint source pollutant loadings associated with the storm event. The algorithms utilize the SCS TR - 55 method for calculating runoff hydrographs for a single storm event. A methodology has been adapted to …
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Improved Understanding Of Subsurface Hydrology In Variable Source Areas And Its Implications For Water Quality
… are hot spots of hydrological (saturation-excess runoff) and biogeochemical processes (e.g. nitrogen, phosphorus, organic carbon cycling) in the landscapes of the northeastern U.S. Despite the substantial research conducted in the past 50 years, there is still process understanding to be gained on …
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Measurement and Simulation of Preferential Flow in Frozen Soils
… reduced soil infiltrability and enhanced runoff generation over subsequent events. Preferential flow allowed meltwater to bypass portions of the frozen soil and facilitated the lateral transport of meltwater between high and low topographic positions and groundwater recharge through frozen …
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Interactions between hydrology and biogeochemistry within riparian wetlands
… dynamics within the riparian areas. Here, runoff generation processes are strongly influenced by the spatial structure of the wetland-typical micro-topography (hummocks and hollows). Surface flow is episodically generated by a highly dynamical, threshold-controlled process where extended …
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AN INVESTIGATION OF SOIL WATER MOVEMENT ON DRAINED AND UNDRAINED CLAY GRASSLAND IN SOUTH WEST ENGLAND
… to characterise discharge regimes, elucidate runoff generation mechanisms and to consider implications for solute movement under natural and drained conditions. Research was conducted on a heavy clay grassland soil in an area of high rainfall (1053 mm a ˉ¹) in South West England. A combined …
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Simulação do fenômeno de infiltração em modelos chuva-vazão
… hydrological process simulation in rainfall-runoff models, emphasizing its influence on runoff generation. Based on physical principles of water flow through porous media, an extension of Green & Ampt's equation (Morel-Seytoux e Khanji,1974; Morel-Seytoux, 1978) was been used to estimate …
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Soil moisture dynamics and soil moisture controlled runoff processes at different spatial scales : from observation to modelling
… moisture is a key state variable that controls runoff formation, infiltration and partitioning of radiation into latent and sensible heat. However, the experimental characterisation of near surface soil moisture patterns and their controls on runoff formation remains a challenge. This subject …
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