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An Explicit Scheme to Represent the Bidirectional Hydrologic Exchanges Between the Vadose Zone, Phreatic Aquifer, and River
Water Resources Research ( IF 5.4 ) Pub Date : 2020-09-01 , DOI: 10.1029/2020wr027571
M. Hong 1 , B. P. Mohanty 1 , Z. Sheng 2
Affiliation  

Understanding groundwater storage variations as a result of effects from both the vadose zone and the river is of critical importance in the hydraulically connected surface‐subsurface system. In this study, we present a novel Bidirectional Exchange Scheme in Surface and Subsurface (BE3S) that represents bidirectional exchanges between the vadose zone, phreatic aquifer, and river. The approach enables explicit representations of each flow regime while conserving mass, and successfully yields solutions of the coupled system for multiple temporal resolutions. We test the scheme by comparing the BE3S‐derived outputs against other models and corresponding observational data. We apply the scheme to simulate hydrologic states in a reach of the Brazos River in Southeast Texas, such as soil moisture content, groundwater level, and river stage as well as net subsurface discharge fluxes. Good agreements between the simulated and observed data for all the components show the suitability of the proposed scheme in modeling the bidirectional flows and exchanges. We also assess how the bidirectional hydrologic exchanges are affected by adjacent flow domains. We find that vertical percolation is significantly affected by unsaturated soil thickness, resulting in the spatial variability of vertical percolation across sloping topography. Hilltop‐to‐valley convergent groundwater flow is also found to impede vertical percolation in river valleys due to shallow water table while facilitating percolation in the hilltops. The capability of the presented scheme that accounts for the topographically driven lateral groundwater flow and drainage dynamics provides the potential to enhance the representation of the surface‐subsurface system in Earth System Models (ESMs).

中文翻译:

代表渗流区,潜水层和河流之间双向水文交换的显式方案

在水力连通的地表—地下系统中,了解由渗流带和河流共同作用造成的地下水储量变化至关重要。在这项研究中,我们提出了一种新颖的地表和地下双向交换方案(BE3S),该方案代表了渗流带,潜水含水层和河流之间的双向交换。该方法在保持质量的同时,可以显式表示每个流态,并成功地为多个时间分辨率提供了耦合系统的解。我们通过将BE3S的输出与其他模型和相应的观测数据进行比较来测试该方案。我们应用该方案模拟德克萨斯州东南部布拉索斯河河段的水文状态,例如土壤含水量,地下水位,河流级以及地下净流量。所有组件的仿真数据和观察数据之间的良好一致性表明,该方案适用于对双向流和交换进行建模。我们还评估了双向水文交换如何受到相邻流域的影响。我们发现垂直渗滤受非饱和土壤厚度的显着影响,导致垂直渗滤在倾斜地形上的空间变异性。人们还发现,由于地下水位浅,山顶到山谷的汇聚地下水流阻碍了河谷的垂直渗滤,同时也促进了山顶的渗滤。
更新日期:2020-09-20
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