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首页> 外文期刊>Journal of the American Water Resources Association >Evaluating Baseflow Simulation in the National Water Model: A Case Study in the Northern High Plains Region, USA
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Evaluating Baseflow Simulation in the National Water Model: A Case Study in the Northern High Plains Region, USA

机译：评估国家水模型的基础仿真 - 以美国北高平原地区为例

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摘要

The National Water Model (NWM) is a high-resolution hydrological model capable of providing streamflow forecast at 2.7 million reaches across the conterminous United States (U.S.). It utilizes a conceptual (not physically explicit) module for estimating groundwater discharge (baseflow) to streams, and the baseflow module only allows for one-way flux from the aquifer to the streams, with no interflow between surficial or groundwater catchments. This study evaluated the ability of the NWM to simulate baseflow in different geologic conditions with a case study in the Northern High Plains region. The study also evaluated two alternative formulations for the baseflow module in the NWM with the goal of improving simulated baseflow accuracy. The NWM simulated baseflow more accurately in a clayey catchment than in a sandy catchment. The model, however, over simulated baseflow during storm runoff events and under simulated during low flow events in both catchments. Analysis of groundwater recharge simulation showed that the NWM over simulated groundwater recharge for both catchment types, and reducing groundwater recharge using U.S. Geological Survey Baseflow Indexes improved the model performance for baseflow simulation, especially in the sandy catchment. Evaluation of the alteranative formulations showed that a modified Rorabaugh-Rutledge formulation was able to improve the baseflow simulation with RMSE of 7.98 m(3)/s and R-2 of 0.41 and also improved the timing of peak flows.
机译：国家水模型（NWM）是一种高分辨率水文模型，能够在孔雀石美国（美国）的270万左右的流出预报。它利用概念性（非物理显式）模块用于估计地下水放电（基流）到流，并且基础流模块仅允许从含水层到流的单向通量，但是地面或地下水集液之间没有交流。该研究评估了NWM在不同地质条件下模拟了碱流出的能力，其中北高平原区的案例研究。该研究还评估了NWM中的基础流模块的两种替代配方，其目的是提高模拟的基流精度。 NWM在Clayey集水区比在砂内集水区内更准确地模拟底流。然而，该模型在风暴径流事件期间和在两个集水区中的低流动事件期间模拟的模拟基础上。地下水充电仿真分析表明，使用美国的集水区模拟地下水补给水模拟地下水再充电。地质调查基础流指数改善了基础仿真的模型性能，尤其是在沙滩上的模型性能。反相制剂的评价表明，改性的Rorabaugh-Rutledge配方能够改善RMSE为7.98m（3）/ s和0.41的R-2的基础模拟，并且还改善了峰流的时序。

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