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 25 for “"Stormflow"”.
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Impact of Isotopic Heterogeneity in Shallow Systems on Modeling of Stormflow Generation
… in hydrologic and geochemical modeling of stormflow generation in watersheds has been quantification of the contributions of water and solutes from different sources and hydrologic pathways to streamwater. Isotopic techniques have recently gained widespread acceptance as useful tools in the …
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NATURALLY ACIDIC OR ANTHROPOGENICALLY ACIDIFIED? UNCOVERING THE DRIVERS OF STREAM ACIDITY DURING STORMFLOW IN THE NEE SOON CATCHMENT, SINGAPORE
Episodic acidification occurs as periods of high flow temporarily reduce the streams’ acid neutralizing capacity (ANC). In Singapore, the acidification of streams in the Nee Soon Swamp Forest (NSSF) is thought to have deleterious impacts on aquatic ecosystems. This research aims to understand …
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Applications of GIS in hydrologic modeling
… systems (GIS) to hydrologic modeling, stormflow generation in steep watersheds of humid regions, and automated configurations of watersheds was reviewed. A hydrologic model in conjunction with GIS technology was constructed to simulate stormflow hydrographs from a watershed. The model …
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Stormwater Monitoring: Evaluation of Uncertainty due to Inadequate Temporal Sampling and Applications for Engineering Education
… understand the physical processes that produce stormflow and the effects that these stressors have on stormwater runoff and water quality. This dissertation addresses these challenges through methodologies that can improve the way we measure stormflow and educate future hydrology professionals. …
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Effects of forest harvesting best management practices on surface water quality in the Virginia coastal plain
… in no statistically significant change in stormflow volume. BMP implementation was found to be effective in minimizing harvesting impacts on stormflow total suspended solids (TSS), ammonia, total Kjeldahl nitrogen (TKN), total nitrogen (TN), sediment-bound nitrogen and total phosphorous …
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Thermal Pollution in Urban Streams of the North Carolina Piedmont
… Groffman et al. 2002, 2003). These baseflow and stormflow changes lead to the loss of sensitive taxa and increase in tolerant biota, as well as changes in ecosystem function, including carbon and nitrogen processing (Paul and Meyer 2001, Meyer et al. 2005, Imberger et al. 2008, Cuffney et al. …
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Investigating Subsurface Flow Delivery to a Small High Arctic River
… dominant controls on the delivery of baseflow, stormflow and solutes to channels in temperate systems. Arctic systems are increasingly being shown to possess similar delivery mechanisms, however the topic is understudied, acutely so in the High Arctic. This work assesses the nature of delivery …
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The influence of urbanization on runoff generation and stream chemistry in Massachusetts watersheds
… subsurface 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 …
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Sediment and Organic Carbon Variability in a Tropical Urban Catchment.
… DOC and POC concentrations were higher under stormflow conditions. Spatial analysis found the ratio of DOC/POC decreasing downstream, while a positive correlation was noted between POC and SS. Finally, some understandings of OC loads were reached.
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An assessment of streamflow production mechanisms for dam safety applications in the Colorado Front Range
… Saturation-excess runoff and subsurface stormflow mechanisms are known to be important for common events in forested regions, but few studies have analyzed their role for extreme events. The objectives of this study are to determine the active streamflow mechanisms for large historical …
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Exploring Phosphorus Dynamics in Mid-Atlantic Soils: A Multi-Scale Analysis Integrating Soil Fertility and Land Management for Environmental Sustainability
… P concentrations exceeding 0.10 mg L-1, with stormflow conditions showing significantly higher total P concentrations and loadings compared to baseflow. Landscape-scale turbidity strongly correlated with elevated total P levels, emphasizing the role of particulate P transport. Baseflow samples …
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Post-fire Response of Little Creek Watershed: Evaluation of Change in Sediment Production and Suspended Sediment Transport
… effect of the fire did not produce increases in stormflow volumes and event sediment load, likely due to the fact near-stream sediment contribution was minimal and the majority of hillslope-derived sediment sources were not hydrologically connected. This study provides valuable information for …
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Nutrient dynamics in the Lake Manassas (Virginia) watershed
… under baseflow conditions. On an annual basis, stormflow runoff contributed as much as twelve times the tributary baseflow loading of phosphorus.
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Phosphorus Cycling in the Ellison Park Wetland at the Mouth of Irondequoit Creek, Rochester, NY: A Case Study Evaluating the Movement of Phosphorus as it Transits a Coastal Wetland of Lake Ontario
… µg L-1 for SRP and 22.73 to 88.67 µg L-1 for TP. Stormflow event water samples are typically at higher concentrations ranging from 6.24 to 9.300 µg L-1 for SRP and 46.65 to 428.33 µg L-1 for TP. The SRP and TP values give evidence that hydrologic event type plays a significant role in the quantity …
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Hydrologic Response of Alternative Valley Fill Reclamation Designs
… that current MTM reclamation techniques increase stormflow response of the affected watersheds when compared to the original, undisturbed conditions. One method that has shown success in reclaiming surface mine sites in semi-arid regions of the western U.S. is geomorphic landform design. …
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Occurrence of Pharmaceuticals and Personal Care Products (PPCP) & Artificial Sweeteners (AS) in Surface Waters of Maryland's Chesapeake Bay Western Shore
… in one headwater stream during storm events. Stormflow discharge was shown to impact the water quality of the receiving waters. The combination of discharge data, OWTS distribution data, an extensive suite of PPCP and AS and varied catchment types used in this thesis contributes to the …
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Spatial and temporal water quality in the River Esk in relation to freshwater pearl mussels
… of the water quality at both baseflow and stormflow. Anion and cation analysis were conducted on all samples and field-based characterisation furthered by use of a YSI multi-parameter probe. Results revealed a number of concentration hotspots with values of nitrate that are thought …
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MONITORING STORMWATER INFILTRATION IN A VACANT LOT COMPARING TIME-LAPSE ELECTROMAGNETIC INDUCTION AND ELECTRICAL RESISTIVITY TOMOGRAPHY
… cover to increase infiltration and reduce stormflow is poorly understood. The goal of this study was to develop faster methods for monitoring stormwater infiltration to improve characterization of heterogeneous urban systems. Geophysical techniques are capable of mapping and characterizing …
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Pollutant swapping in constructed agricultural wetlands
… that disturbance of bottom sediments by stormflow may elicit heightened GHG and nutrient releases. Therefore the net impact of wetland construction in catchments may need reconsiderations, with respect to the potentially detrimental effects on water and the atmosphere. However upscaling …
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Algal nutrients: sources and patterns of flow in the Occoquan Watershed
… high nitrate loadings only during periods of stormflow. At baseflow, Occoquan Creek nutrient loadings were found to be insignificant. A decrease in nutrient content of the Occoquan Creek tributary was observed during summer due to the influence of a small recreational lake in Occoquan Creek …
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