Modeling the surface water and groundwater budgets of the US using MODFLOW-OWHM
Modeling the surface water and groundwater budgets of the US using MODFLOW-OWHM
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DOI：
10.1016/j.advwatres.2020.103682
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发表时间：
2020-09-01
影响因子：
4.7
通讯作者：
Boyce, Scott E.
中科院分区：
文献类型：
--
作者：
Alattar, Mustafa H.;Troy, Tara J.;Boyce, Scott E.
在大规模的地下水和地表水预算评估中，如美国本土，通常分别分析连接地表和地下水资源类别的复杂动态。这些动态包括补给和地下水对径流的贡献。由于过程和数据可用性的复杂性，在大的空间和时间尺度上对这些复杂的水文动态进行时变模拟仍然是一个科学挑战。在这项研究中，地下水通量和地表水文过程模拟整个美国连续1950-2010年。模拟估计每月的水预算组成部分，如地下水补给，地表径流，蒸散量;在主要河流的径流路由，同时考虑地下水交换。人类的影响包括抽取地下水的影响，气候变化也包括在内，包括降水、温度和潜在蒸散量的变化。模拟的地下水位和河流流量与美国地质调查局的观测威尔斯井和流量计有很强的相关性，R-2值分别为0.992和0.946。模拟蒸散量与其他三种已发表的估计方法进行了比较，表明它是能够捕捉的大小和季节性的蒸散量在密西西比河流域。因此，该模型能够合理地模拟美国的地表水和地下水预算，允许在未来探索气候和人类影响的相对重要性的问题。
Assessments of groundwater and surface water budgets at a large scale, such as the contiguous United States, often separately analyze the complex dynamics linking the surface and subsurface categories of water resources. These dynamics include recharge and groundwater contributions to streamflow. The time-varying simulation of these complex hydrologic dynamics, across large spatial and temporal scales, remains a scientific challenge due to the complexity of the processes and data availability. In this study, groundwater fluxes and surface hydrologic processes are simulated across the contiguous US for 1950-2010. The simulation estimates the monthly water budget components, such as groundwater recharge, surface runoff, and evapotranspiration; streamflow in major rivers is routed while accounting for groundwater exchange. Human impacts are included through groundwater pumping, and climate variability is included, including variability in precipitation, temperature and potential evapotranspiration. The simulated groundwater level and river discharge have strong correlation with USGS observation wells and streamflow gages, with R-2 values of 0.992 and 0.946, respectively. The simulated evapotranspiration is compared with three other published estimation methods, showing that it is able to capture the magnitude and seasonality of evapotranspiration over the Mississippi River basin. As such, the model is able to reasonably simulate the surface and groundwater budgets over the US, allowing for questions of the relative importance of climate and human impacts to be explored in the future.