Darcy multi-domain approach for integrated ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

Darcy multi-domain approach for integrated surface/subsurface hydrologic models
Author:Sylvain WEILL <sylvain.weill@cea.fr> (CEA)
Emmanuel MOUCHE <emmanuel.mouche@cea.fr> (CEA)
Presenter:Sylvain WEILL <sylvain.weill@cea.fr> (CEA)
Date: 2006-06-18     Track: General Sessions     Session: General

A Darcy multi-domain approach for modeling surface and subsurface hydrologic processes is presented. The diffusive wave approximation is used to model runoff. The resulting equation is formulated as a Darcy nonlinear one. Therefore, the water dynamics in the three physical domains, ground surface, vadose zone and saturated zone, is described through a single Darcy nonlinear equation with domain-dependent parameters. This multi-domain Darcy equation is solved with Mixed Hybrid Finite Element formulation. The time discretisation is implicit and the nonlinear equations are solved within a sequential iterative Picard scheme. This model can describe Hortonian runoff, runoff due to rainfall on saturated areas and seepage. In order to evaluate this new modeling approach, different test cases are simulated: uniform rainfall on non-convergent hillslope topography with constant slope and a 3D open book geometry, representing two hillslope sides with a stream in between. Simulation results show that our model is able to model saturated area spreading and different runoff generation processes.