Conjunctive surface-subsurface modeling of overland flow |
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| Institution: | 1. Dept. of Engrg., Parthenope Univ. of Naples, Centro Direzionale di Napoli, Is. C4, 80143 Napoli, Italy;2. Dept. of Civil, Architectural and Environmental Engrg., Federico II Univ. of Naples, via Claudio 21, 80125 Napoli, Italy;1. School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China;2. Hubei Key Laboratory of Computational Science, Wuhan University, Wuhan 430072, China;1. Chair of Water Resources Management and Modeling of Hydrosystems, Technische Universität Berlin, Germany;2. Energy Geosciences Division, Lawrence Berkeley National Laboratory, USA;3. Department of Engineering, University of Cambridge, Cambridge, UK;4. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China |
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| Abstract: | In this paper, details of a conjunctive surface-subsurface numerical model for the simulation of overland flow are presented. In this model, the complete one-dimensional Saint-Venant equations for the surface flow are solved by a simple, explicit, essentially non-oscillating (ENO) scheme. The two-dimensional Richards equation in the mixed form for the subsurface flow is solved using an efficient strongly implicit finite-difference scheme. The explicit scheme for the surface flow component results in a simple method for connecting the surface and subsurface components. The model is verified using the experimental data and previous numerical results available in the literature. The proposed model is used to study the two-dimensionality effects due to non-homogeneous subsurface characteristics. Applicability of the model to handle complex subsurface conditions is demonstrated. |
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