Dam Break Flow Modelling and Geographical Distribution of the Roughness Coefficient

摘要

Dam break flow modelling is a major field of research. In order to enable riskanalysis in the downstream valleys of dams, 2D numerical simulations are of primeinterest. These are based on the conservative set of shallow water equations. Beyondtheir numerical implementation, the challenge of the computation relies on the abilityto handle very huge sets of high-precision data, in order to get the highest possibleaccuracy, whereas the computational time must remain realistic for simulationscarried out on real valleys topography.In this paper, a simulation on about 2 500 000 cells is presented. Particularly, theresults are compared and discussed regarding especially the exploitation of landusedata for the roughness. Beyond the examples of validation, the relevance of thedeveloped methodology appears to be essential in the framework of risk analysis.