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The Exact Groundwater Divide on Water Table between Two Rivers: A Fundamental Model Investigation

Ministry of Education Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
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Water 2019, 11(4), 685; https://doi.org/10.3390/w11040685
Received: 13 March 2019 / Revised: 29 March 2019 / Accepted: 1 April 2019 / Published: 2 April 2019
(This article belongs to the Section Hydrology)
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Abstract

The groundwater divide within a plane has long been delineated as a water table ridge composed of the local top points of a water table. This definition has not been examined well for river basins. We developed a fundamental model of a two-dimensional unsaturated–saturated flow in a profile between two rivers. The exact groundwater divide can be identified from the boundary between two local flow systems and compared with the top of a water table. It is closer to the river of a higher water level than the top of a water table. The catchment area would be overestimated (up to ~50%) for a high river and underestimated (up to ~15%) for a low river by using the top of the water table. Furthermore, a pass-through flow from one river to another would be developed below two local flow systems when the groundwater divide is significantly close to a high river. View Full-Text
Keywords: groundwater divide; water table; unsaturated–saturated flow; catchment area; pass-through flow groundwater divide; water table; unsaturated–saturated flow; catchment area; pass-through flow
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Han, P.-F.; Wang, X.-S.; Wan, L.; Jiang, X.-W.; Hu, F.-S. The Exact Groundwater Divide on Water Table between Two Rivers: A Fundamental Model Investigation. Water 2019, 11, 685.

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