A new analytical solution for testing debris avalanche numerical models

Sudi Mungkasi, Stephen Gwyn Roberts

Abstract


An analytical solution to a debris avalanche problem in the one dimensional topography-linked coordinate system was found by Mangeney, Heinrich, and Roche [Pure Appl. Geophys., 157:1081--1096, 2000]. We derive an analytical solution to a debris avalanche problem in the standard Cartesian coordinate system. Characteristics and a transformation technique obtain the analytical solution. This analytical solution is used to test finite volume methods with reconstruction of the conserved quantities based on: either stage, height, and velocity; or stage, height, and momentum. Numerical tests show that the finite volume method with reconstruction based on stage, height, and momentum is slightly more accurate in solving the debris avalanche problem.

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Keywords


debris avalanche; dam break; Saint-Venant approach; finite volume method

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DOI: http://dx.doi.org/10.21914/anziamj.v52i0.3785



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