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Mapping mean annual groundwater recharge in the Nebraska Sand Hills, USA |
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| Authors: | Jozsef Szilagyi Vitaly A Zlotnik John B Gates Janos Jozsa |
| Institution: | 1. Department of Hydraulic and Water Resources Engineering, Budapest University of Technology and Economics, Muegyetem Rakpart. 3?C9, 1111, Budapest, Hungary 2. School of Natural Resources, University of Nebraska-Lincoln, 3310 Holdrege Street HH625, Lincoln, NE, 68583, USA 3. Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, 214 Bessey Hall, Lincoln, NE, 68588-0340, USA |
| Abstract: | Mean annual recharge in the Sand Hills of Nebraska (USA) over the 2000?C2009 period was estimated at a 1-km spatial resolution as the difference of mean annual precipitation (P) and evapotranspiration (ET). Monthly P values came from the PRISM dataset, while monthly ET values were derived from linear transformations of the MODIS daytime land-surface temperature values into pixel ET rates with the help of ancillary atmospheric data (air temperature, humidity, and global radiation). The study area receives about 73?mm of recharge (with an error bound of ±73?mm) annually, which is about 14?±?14% of the regional mean annual P value of 533?mm. The largest recharge rates (about 200?±?85?mm or 30?±?12% of P) occur in the south-eastern part of the Sand Hills due to smoother terrain and more abundant precipitation (around 700?mm), while recharge is the smallest (about 40?±?59?mm or 10?±?14% of P) in the western part, where annual precipitation is only about 420?mm. Typically, lakes, wetlands, wet inter-dunal valleys, rivers, irrigated crops (except in the south-eastern region) and certain parts of afforested areas in the south-central portion of the study area act as discharge areas for groundwater. |
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