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.
Results
Showing 1 to 20 of 44 for “"urban watersheds"”.
-
Pluvial Flood Risk Estimation Procedure for Small Urban Watersheds
… a general procedure that can be used to model urban pluvial flood scenarios, estimate damages, and quantify pluvial flood risk for microwatersheds (watersheds of a few square miles or less). The model development was accomplished using EPA's SWMM in combination with GIS datasets and analyses. …
-
Modeling event-based coupled hydrologic and mass transport in small urban watersheds
… events data were collected at two similar urban watersheds for model calibration and verification. A mathematically and physically-based criterion was proposed to differentiate rainfall-runoff events between either mass-limited or flow-limited. Statistical techniques of Logistic Regression …
-
A distributed modeling approach for evaluating hydrological effects of rain gardens in urban watersheds
… practices used to mitigate the effects of urbanization such as excess runoff and water quality issues. Implementation of BMPs and LID have been limited and sometimes restricted because of the lack of recognized methodologies to estimate their hydrologic effects in urban watersheds under a …
-
Modeling Climate Change Impacts on the Effectiveness of Stormwater Control Measures in Urban Watersheds
… recent advances, the assessment of CC impacts in urban watersheds remains an area of active research, in part due to the small temporal and spatial scales needed to adequately characterize urban systems. Urban watersheds have been the focus of considerable efforts to restore hydrology and water …
-
Spatial scale data requirements using NEXRAD (WSR-88D) for accurate hydrologic prediction in urban watersheds
… input on the hydrologic prediction at two urban watersheds during two recent severe storms and compared the results the hydrologic prediction using rain gages and to the observed hydrograph. Small deviations were observed with the different grid scales, but these differences were considered …
-
Assessment of integrated green infrastructure-based stormwater controls in small to large scale developed urban watersheds
… control practices at small to large scales in urban watersheds. The hypothesis of this research is: "Retrofitting integrated green infrastructure controls in large areas served by separate or combined sewers can result in significant runoff volume reductions." Three case studies which were …
-
A method to assess the ecological integrity of urban watersheds that integrates chemical, physical and biological data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
-
An assessment of models and methodologies used in the design of detention facilities for small urban watersheds
… its natural rural condition to a more impervious urban condition. The purpose of this research was to develop an improved methodology for the sizing of detention facilities for small urban watersheds. This research evaluated the tools used to determine the quantity of stormwater runoff from such …
-
Methods of determining stream setback corridors in urban watersheds from remotely sensed data in the Dallas metropolitan area, Texas.
Bank stability in urbanized streams is worsening in response to increased runoff, causing unprecedented stream erosion. Eroding banks pose a serious threat to existing structures prompting cities to create buffer zone ordinances to prevent the loss of future structures. Unfortunately, most …
-
The Role of Carbonaceous Materials in Pavement Dust, Soils, and Lake Sediments on the Fate of Organic Pollutants in Small Urban Watersheds
Field samples were fractionated into light (LFr), heavy (HFr), and condensed CMs (CCMs) fractions with sequential physical and chemical treatment. These fractions and bulk samples were characterized with elemental analysis, Fourier transform infrared spectroscopy, specific surface area measurement, …
-
Precipitation Estimation Methods in Continuous, Distributed Urban Hydrologic Modeling
… in hydrological modeling, particularly in small, urban watersheds which respond rapidly to precipitation and can experience significant spatial variability in rainfall fields. Few studies have compared QPE methods in small, urban watersheds, and studies which have examined this topic only compared …
-
Changes in Stormwater Thermal Loads Due to Bioretention Cells
… susceptible to changes in stream temperatures. Urban development and the increase in impervious surfaces alter the hydrologic cycle in urban watersheds, limiting infiltration and increasing surface runoff. Impervious surfaces absorb and store solar radiation, resulting in higher surfaces …
-
Sensitivity of Stormwater Management Solutions to Spatial Scale
<p>Urbanization has considerably altered natural hydrology of urban watersheds by increasing runoff volume, producing higher and faster peak flows, and reducing water quality. Efforts to minimize or avoid these impacts, for example by implementing low impact development (LID) practices, are gaining …
-
Trends in stream power and erosion at a suburban stream in Western New York
… that impacts water quality, flow, and ecology. Urban watersheds are particularly sensitive due to a greater proportion of directly connected impervious land cover resulting in increased runoff into streams. Climate change has exacerbated the problem in the Northeast United States, as …
-
Impacts of legacy mining on stream structural and functional processes in an urban stream
… to improve the understanding of mine drainage in urban watersheds, specifically how neutral mine drainage (NMD) influences urban streams. Past research on both urban streams and mine impacted streams has largely focused on characterizing streams using structural approaches although there has been …
-
Urban Erosion Potential Risk Mapping with GIS
… concern as it originates during both rural and urban activities, and often carries other pollutants (metals, nutrients, etc.) with it. Existing erosion models focus primarily on estimating erosion from agricultural watersheds. Methods are needed to predict areas with high erosive potential (EP) …
-
Measuring and modeling stream and air temperature relationships in a multiland use watershed of the central United States
… watershed study design approach was used in an urban watershed of the central U.S. to investigate stream water temperature (Tw) variability during water year's 2011, 2012, and 2013. Drought conditions were observed during water year 2012 when total annual precipitation was approximately 340 mm …
-
A Method for the Determination of Design Discharges for Urban Stream Restoration Projects in Northern Virginia
It is well documented that urbanization changes the hydrology of watersheds (Hammer 1972; Booth 1991; Rose and Peters 2001). Increases in runoff volume and velocity from urbanization result in stream channel degradation (Hammer 1972; Henshaw and Booth 2000; Walsh et al. 2005; Leopold et al. 2005a; …
-
The effects of rainfall runoff from urban and rural watersheds on trihalomethane precursors in streams
… and THM-precursor loadings in runoff from the watersheds. Fall runoff from Broad Run contributed the highest mass loading. Impoundment was seen to increase the amount of THM precursors downstream of Lake Manassas on Broad Run with the largest difference observed during the fall event. The …
-
Evaluation of cost effective approaches for nutrient removal in urban stormwater and wastewater: City of Fort Collins case study
… effluent nitrogen and phosphorus standards from urban watersheds, this study compares existing nutrient discharges from wastewater and stormwater sources in Fort Collins, Colorado and evaluates the benefits and costs of nutrient removal strategies identified in both sectors as a guide to urban …
Page 1 of 3