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University of Nevada Reno (2020)

Assessing Groundwater Pumping and Landsat Satellite Crop Evapotranspiration Estimates in Diamond Valley, Nevada for Improved Water Resources Management

Ott, Thomas Joseph

Titre : Assessing Groundwater Pumping and Landsat Satellite Crop Evapotranspiration Estimates in Diamond Valley, Nevada for Improved Water Resources Management

Auteur : Ott, Thomas Joseph

Université de soutenance : University of Nevada Reno

Grade : Master of Science in Hydrogeology 2020

Résumé partiel
Groundwater pumping for irrigation has resulted in overdraft for many aquifers across the western United States. As a result, regulators and producers are developing and implementing groundwater management plans to monitor and reduce groundwater pumping in many areas. Groundwater management plans often require quarterly and annual reporting of pumped groundwater which can be difficult for water managers to quality assure and quality control (QAQC). In this study, it is hypothesized that satellite-based evapotranspiration (ET) estimates will be useful to QAQC and ultimately estimate groundwater pumping at field and basin scales. To test this hypothesis, the objectives of this study were as follows : first, to pair an ensemble of satellite-based ET model estimates of Net ET (ET less precipitation) with metered pumping data from Diamond Valley, Nevada, second, to develop a regression model to QAQC metered pumping data, and third, to ultimately predict pumping and assesses uncertainty using nonparametric bootstrapping. Predictions of pumping volume were summarized at field and basin scales and compared with pumping volumes reported by the Nevada Division of Water Resources (NDWR). While previous studies have used satellite-based ET to estimate groundwater pumping volumes, those studies have had little to no metered pumping data to validate their estimates. In this study, Landsat satellite-based ET estimates of daily and monthly ET and fraction of reference ET (ETf) were derived from METRIC, SSEBop, and SIMS ET models.

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Page publiée le 23 novembre 2020