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Central-Upwind Schemes for the Saint-Venant System

Published online by Cambridge University Press:  15 August 2002

Alexander Kurganov
Affiliation:
Department of Mathematics, University of Michigan, Ann Arbor, MI 48109-1109 and Mathematics Department, Tulane University, New Orleans, LA 70118, USA. kurganov@math.tulane.edu.
Doron Levy
Affiliation:
Department of Mathematics, Stanford University, Stanford, CA 94305-2125, USA. dlevy@math.stanford.edu.
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Abstract

We present one- and two-dimensional central-upwind schemesfor approximating solutions of the Saint-Venant system with source terms due to bottom topography. The Saint-Venant system has steady-state solutionsin which nonzero flux gradients are exactly balanced by the source terms. It is a challenging problem to preservethis delicate balance with numerical schemes.Small perturbations of these states are also very difficultto compute. Our approach is based on extending semi-discrete central schemes forsystems of hyperbolic conservation laws to balance laws.Special attention is paid to the discretization of the sourceterm such as to preserve stationary steady-statesolutions. We also prove that the second-order version of our schemes preserves the nonnegativity of the height of the water.This important feature allows one to compute solutions for problemsthat include dry areas.

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Type
Research Article
Copyright
© EDP Sciences, SMAI, 2002

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