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首页> 美国政府科技报告 >Simulation of Groundwater Flow and Effects of Groundwater Irrigation on Stream Base Flow in the Elkhorn and Loup River Basins, 1895-2055--Phase Two
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Simulation of Groundwater Flow and Effects of Groundwater Irrigation on Stream Base Flow in the Elkhorn and Loup River Basins, 1895-2055--Phase Two

机译：1895 - 2055年Elkhorn和Loup河流域地下水流动模拟及地下水灌溉对河流基流的影响 - 第二阶段

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This report presents the phase-two groundwater-flow simulations and predicted effects of groundwater irrigation on stream base flow in the Elkhorn and Loup River Basins of central Nebraska. This report describes the construction and calibration of the simulations and the methods used to predict changes to stream base flow that result from changes to groundwater irrigation. Effects of groundwater irrigation were evaluated using three distinct approaches: (1) a base-flow depletion analysis, derived from results of the model simulation, mapped the spatial distribution of the percentage of pumped water that causes base-flow depletion at the end of a 50-year period; (2) groundwater-flow simulations were used to predict changes to stream base flow that resulted from changes to the amount of irrigated area during a 25-year period; and (3) a simulation-optimization model determined the minimum reduction of groundwater pumpage that would be necessary in the Elkhorn River Basin to maintain various hypothetical levels of base flow in the Elkhorn River.

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