Modeling of Hydrological Processes Using Unstructured and Irregular Grids: 2D Groundwater Application
Publication: Journal of Hydrologic Engineering
Volume 16, Issue 2
Abstract
To better handle landscape heterogeneities in distributed hydrological modeling, an earlier work proposed a discretization based on nested levels, which leads to fully unstructured modeling meshes. Upon such a discretization, traditional numerical solutions must be adapted, especially to describe lateral flow between the unstructured mesh elements. In this paper, we illustrated the feasibility of the numeric solution of the diffusion equation, representing groundwater flow, using unstructured meshes. Thus, a two-dimensional (2D) groundwater model (BOUSS2D), adapted to convex unstructured and irregular meshes was developed. It is based on the approximation of the 2D Boussinesq equation using numeric techniques suitable for nonorthogonal grids. The handling of vertical and horizontal aquifer heterogeneities is also addressed. The fluxes through the interfaces among joined mesh elements are estimated by the finite volume method and the gradient approximation method. Comparisons between the BOUSS2D predictions and analytical solutions or predictions from existing codes suggest the acceptable performance of the BOUSS2D model. These results therefore encourage the further development of hydrological models using unstructured meshes that are capable of better representing the landscape heterogeneities.
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Acknowledgments
Special thanks go to the International Service of CEMAGREF for funding the stay of the second writer at CEMAGREF-Lyon.
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Published In
Journal of Hydrologic Engineering
Volume 16 • Issue 2 • February 2011
Pages: 108 - 125
Copyright
© 2011 ASCE.
History
Received: Mar 18, 2009
Accepted: Jul 13, 2010
Published online: Jul 19, 2010
Published in print: Feb 2011
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