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 44 for “"potential evapotranspiration"”.
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Estimating potential evapotranspiration
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1960.
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Insolation, Precipitation, and Moisture Maps for a Virginia Geographic Information System
… solar radiation, temperature, precipitation, and potential evapotranspiration. Map layers for combined temperature and precipitation, and a moisture index were also created. Accuracy of the estimates for temperature and precipitation for each 300 m x 300 m pixel were quantitatively assessed. The …
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Evaluation of a Water Budget Model for Use in Wetland Design
… the Thornthwaite and the FAO-56 Penman-Monteith potential evapotranspiration estimation methods for the design of created wetlands. The Wetbud model was tested using data from two existing mitigation wetlands. Both modules produced reasonable results; however, the basic module did not accurately …
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Analysis and management of low flows in small catchments of Brandenburg, Germany
… vulnerability. This thesis mutually evaluates potential adaption measures to sustain minimum runoff in small catchments of Brandenburg, Germany, and similarities of these catchments regarding low flows. The following guiding questions are addressed: (i) Which first-order controls on low flows …
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Historical Hydroclimatic Change At Theodore Roosevelt National Park: 1895 - 2011
… a significant increase in the mean annual potential evapotranspiration, and annual moisture deficit, and a statistically significant decrease in annual actual evapotranspiration, annual snow storage and the annual ratio of actual to potential evapotranspiration. The study site's increasing …
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Near Real-time Seasonal Drought Forecasting and Retrospective Drought Analysis using Simulated Multi- layer Soil Moisture from Hydrological Models at Sub- Watershed Scales
… components including soil moisture (SM), actual evapotranspiration (ET), potential evapotranspiration ET (PET), and runoff (SURQ) for near-real time drought severity assessment, and drought forecasting for a lead of 9-months. A combination of the surface and total rooting depth soil moisture …
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Stable light isotopes in fauna as environmental proxies in the Southern African winter and year-round rainfall zones
… annual soil moisture stress (MASMS), mean annual potential evapotranspiration (MAPE), relative humidity (RH), summer aridity index (SAI), winter concentration of rainfall (WCR), moisture index (MI) and water deficit (WD).
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Evaluating a Process-Based Mitigation Wetland Water Budget Model
… method was applied utilizing two different evapotranspiration estimation methods: Thornthwaite (IPM) and FAO-56 Penman-Monteith (IPM-FAO). A second process-based model, utilizing MODFLOW-2005, was constructed to better predict water levels in mitigation wetlands. Modeled processes included …
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Soil-Specific, Late-Season Nitrogen and Potassium Applications to Increase Corn Yields in the Mid-Atlantic Coastal Plain
… and enabled the proposal of a method to predict potential for corn to utilize late-season N applications based on soil moisture. In an experiment to evaluate late-season fertilizer application rates, N and K were applied in a complete factorial of five N and K rates ranging from 0 to 112 kg ha-1. …
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Investigation of Biotic and Abiotic Factors Affecting Double-Cropped Corn (Zea mays L.) Production in Virginia
… strategy (Brann and Pitman, 1997). To assess the potential constraints on late planted corn imposed by insects and diseases, double-cropped corn was evaluated in field experiments in Montgomery County, Virginia from 1998 to 2000. Factors included two near-isoline hybrids (NK4640 and NK4640Bt), …
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Simulation of hydrologic processes for surface mined lands
… from annual series of precipitation and potential evapotranspiration event sequences.
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An analysis of vegetation pattern and its relationship to NDVI data in the Namaqualand area, South Africa
… significantly correlated to precipitation and potential evapotranspiration (PET) (r = 0.60, -0.63 respectively). A multiple regression model explained 52% of the variance when Mean Annual NDVI was related to climatic variables. Mean NDVI in August (the month of maximum NDVI in most of …
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Drought in Southern Africa: structure, characteristics and impacts
… are determined using a Precipitation minus Evapotranspiration anomaly index which is related to the self-calibrating Palmer Drought Severity Index. It is found that sensible heat flux is strongly correlated with potential evapotranspiration and may be a useful drought indicator. Seven …
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European droughts under climate change: projections and uncertainties
… of changes in drought characteristics under potential future climates is vital for managing drought risks and impacts, yet projections are very uncertain. This thesis examines the effects of climate change on European drought characteristics through a multi-scenario and multimodel approach. …
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Understanding the pattern, shifts and environmental impacts of dynamic plant communities in the Himalayan alpine zone (>4100 m.a.s.l.) under climate change
… on the HAZ are prohibiting understanding of the potential environmental implications of future climate shifts, which have been shown in modelling studies and in a few limited remote sensing investigations to lead to a greener mountain system at higher altitude. This PhD uses remotely sensed data …
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Assessment of the effect of climate change in anticipated water resources availability in arid climate zones
… the following: (1) Highlight the impact of potential evapotranspiration (PET) methods, elevation, and climatic conditions on the reconnaissance drought index (RDI) results, applying three of the most widespread PET estimates, which are Thornthwaite, Hargreaves, and Blaney-Criddle in addition …
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The Effect of Evapotranspiration on the Groundwater Dome and Past Drought Conditions at Cape Henry, Virginia
… park.</p> <p>Using the White Method, the actual evapotranspiration (AET) rates were calculated for the two major vegetation groups, namely ponded wetlands and upland dunes, located on Cape Henry. A higher evapotranspiration (ET) rate was calculated for the wetland setting. A finite difference …
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An Analysis of Changes in the Long Term Characteristics of River Flows in the Munster Blackwater Catchment
… was used to synthesise historical values of potential evapotranspiration before making it fit for purpose for hydrological modelling. This historical data was then used as inputs to the HYSIM and IHACRES lumped conceptual rainfall-runoff models and used to reconstruct flows (hindcast) at the …
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Evaluation of climate change impacts on the hydrologic response of a sparsely-monitored basin in Sardinia, Italy, through distributed hydrologic simulations and hydrometeorological downscaling
… tools for downscaling precipitation and potential evapotranspiration data to create the hourly, high-resolution forcing for the hydrologic model from daily records. Despite the presence of several sources of uncertainty in the observations and model parameterization, the use of the …
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Modeling Fate and Transport of Nitrogen and Phosphorus in Crop Fields Under Tropical Conditions
… Changes to the model included calculation of potential evapotranspiration (ET); changes in initial and default values of N and P pools, C:N ratio of soil organic matter, and soil P sorption; changes in simulation of transformations between N and P pools, along with the effect of temperature; …
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