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 33 for “"water yield"”.
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Relationships between Forest Productivity and Water Yield Across Virginia's Forests
… can result in a decline in downstream water resources, highlighting the need for a better understanding of such tradeoffs to inform incentive programs aimed at influencing land management decisions. In this study, we use remotely sensed products to quantify forest productivity and water …
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Impact of Subsurface Drainage on Water Yield for Typical Soil and Weather in Eastern South Dakota
… drainage in agricultural land changes the field water balance by providing an alternate pathway for subsurface water. Determining the effects of subsurface drainage on downstream hydrology requires quantifying the components of the water balance. A number of studies have looked at the …
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Probabilistic approach to modeling under changing scenarios
… the impacts of land management practices at watershed scale. A two-step probabilistic approach to model calibration and parametrization was implemented using global uncertainty and sensitivity analysis. The Agricultural Policy/Environmental eXtender (APEX) model was developed for the Lake …
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A sensitivity study on modeling hydrologic effects due to urbanization
During recent years the Standford Watershed Model has become a popular means of predicting the hydrologic response of land use changes. A special trial and adjustment model of the Kentucky version is available for determining best-fit values for the input parameters to the Watershed Model. This …
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Numerical study of a hybrid photovoltaic thermal desalination system
… to climate change. In addition, fresh water supplies are becoming scarcer amidst instabilities in weather patterns and unsustainable water consumption levels. As such, photovoltaic (PV) systems have emerged as a potential off-grid alternative to traditional fossil fuel energy …
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Optimization Techniques for Instream Flow Allocations
… as part of the project planning process of water resources development. A mathematical programming methodology is developed which provides an analysis technique for multipurpose reservoirs for both biological instream flow needs (IFN) and more traditional water project objectives such as …
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Calibration of a conceptual rainfall-runoff model using simulated annealing
… of a mathematical model that predicts the water yield from a catchment. The calibration problem involves finding the global minimum of a multivariate function that has many extraneous local minima, a situation in which conventional optimisation methods are ineffective. The objective …
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Water resource decision making in the Western Cape system analysis
Water resource decision making in Greater Cape Town is characterised by numerous, often conflicting goals. Among these are ensuring engineering feasibility and flexibility of supply, maximising water yield, minimising costs and minimising negative environmental and social impacts. Furthermore, in …
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Modeling the Effects of Forest Road Density on Streamflow in the Blue Ridge Mountains
Forested watersheds have often been managed for flood mitigation. Studies have shown that forests have the potential to minimize peak flows during storm events, yet the relationship between forests and flooding is inexact. Forest roads, usually found in managed systems, can potentially magnify the …
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Surface hydrologic modeling and GIS: a case study of the Kaimai Hydropower project catchment, New Zealand
… allow users to define parameters for each sub-watershed or river section depending on the availability of the data. A study was conducted at the Kaimai Hydropower catchment, Tauranga, to identify the potential advantages and disadvantages of spatial hydrologic modeling for use in surface runoff …
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Observed and Predicted Climate Change Impact on Water Resources of the Upper Indus Basin: English
Climate change has implications for water resources across the World by increasing temperature, shifting precipitation patterns and altering the timing of snowfall/snowmelt, that can lead to seasonal variations in river flows. The water resources of the Upper Indus Basin (UIB) are highly dependent …
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Mist interception by three species of mountain fynbos
… salignum). The portioning of intercepted water into plant-drip and stem-flow was largely influenced by the shape of the plant. The mean rate of water yield per plant observed during five periods of rainfree, misty conditions, was 71 ml hr-1 . Rainfall is, therefore, not the sole source of …
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Catalytic Pyrolysis of Cellulose, Hemicellulose and Lignin Model Compounds
… and Sud-Chemie HZSM-5 catalysts increased the yields of the organic liquid fraction, total liquid and char while decreasing the gas yields. However the catalyst decreased the organic and char yields while increasing the water yields but there was no change in gas yields. The NaOH treatment …
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A comparison of Scs runoff prediction methods for two large watersheds in Sri Lanka
… St. Augustine gauging stations; The Gin Ganga Watershed yielded approximately 73% runoff compared to the 25% yield in the adjoining Nilwala Ganga Watershed. The primary reason for the large difference in water yield could be attributed to the fact that the rainfall gauging stations are …
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Responses of the false limpet, Siphonaria pectinata (Gastropoda, Pulmonata) to osmotic stress
… of the body fluids are largely due tp water movements. Evidence is further presented that fluotuations In the osmotio concentration,of the hemolymph may be effeotively reduced during stress for periods of up to 48 hours. This is done by physical exertion on the part of the animal, …
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A GIS-Based Watershed Impact Management Model
… of sustainable land management practices and water resources. Understanding how land management practices influence hydrological components is essential for the prediction of hydrological consequences of changes in land use. Given the plethora of hydrological models, digital data sources, and …
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Quantifying climate change impacts on future water resources and salinity transport in a high semi-arid watershed using the APEX-MODFLOW-Salt model
… landscape poses threat to impairment of soil and water resources worldwide. Semi-arid regions in the world are expected to experience rising temperatures and lower precipitation, which will impact water supply and likely spatio-temporal patterns of salinity loads affecting downstream water …
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Economic assessment of water management in agriculture: managing salinity and waterlogging in the Arkansas River basin and environmental water shortages in the Platte River basin
… becomes increasingly threatened by both water scarcity and degradation of land and water, the importance of appropriate water management becomes apparent. This dissertation consists of one essay examining the effects of water transfers from agriculture for improving threatened species …
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Evaluating biomass water storage and sap flux in three semi-arid tree species in central Texas
… decision-making concerning climate change, water use, and land use with respect to juniper tree clearing. We used sap flux observations as a proxy for transpiration and capacitance-style FDR sensors installed directly into trees as a means to assess wood water storage. We also recorded …
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Integrated Modeling of Long-Term Vegetation and Hydrologic Dynamics in Rocky Mountain Watersheds
… can have negative and long lasting impacts on water resources. To facilitate integrated management of forest and water resources, a System for Long-Term Integrated Management Modeling (SLIMM) was developed.<p> By combining two spatially explicit, continuous time models, vegetation patterns can …
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