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000859504 1001_ $$0P:(DE-HGF)0$$aRahman, M.$$b0$$eCorresponding author
000859504 245__ $$aTowards a computationally efficient free-surface groundwater flow boundary condition for large-scale hydrological modelling
000859504 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2019
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000859504 520__ $$aShallow groundwater is a critical component of the terrestrial water cycle. It sustains baseflow in rivers, supplies root zones with soil moisture during dry periods, and directly influences the land-atmosphere exchange processes. Nonetheless, the integration of groundwater into large-scale hydrological models remains challenging. The most detailed way of representing groundwater dynamics is to incorporate three-dimensional, variably saturated flow processes in the subsurface representation of hydrological models. However, such detailed modelling is still a challenge for global hydrological applications, mainly due to its high computational demand. In this study, a free-surface boundary condition called the Groundwater Flow Boundary (GFB) is developed to represent groundwater dynamics in a more computationally-efficient manner than the full three-dimensional models do. We evaluate GFB using two synthetic test cases, namely an infiltration experiment and a tilted-v catchment, which focus on groundwater recharge and discharge processes, respectively. The simulation results from GFB are compared with a three-dimensional groundwater flow model and with an over-simplified approach using a free-drainage lower boundary condition to assess the impact of our assumptions on model results. We demonstrate that GFB is computationally more efficient compared to the three-dimensional model with limited loss in model performance when simulating infiltration and runoff dynamics.
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000859504 7001_ $$0P:(DE-HGF)0$$aRosolem, R.$$b1
000859504 7001_ $$0P:(DE-Juel1)151405$$aKollet, Stefan$$b2
000859504 7001_ $$00000-0003-3881-5849$$aWagener, T.$$b3
000859504 773__ $$0PERI:(DE-600)2023320-6$$a10.1016/j.advwatres.2018.11.015$$gVol. 123, p. 225 - 233$$p225 - 233$$tAdvances in water resources$$v123$$x0309-1708$$y2019
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000859504 8564_ $$uhttps://juser.fz-juelich.de/record/859504/files/rahman_etal_2018_update.pdf$$yPublished on 2018-12-04. Available in OpenAccess from 2020-12-04.
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