Simulating malpasset (France) dam break case study by a two dimensional shallow flow model

The paper is dedicated to researching a numerical model for dam-break simulation, which is verified through a comparison between calculated results and observed data of two reference tests. The numerical model is applied to simulate the flooding wave for the Malpasset dam-break event, which occurred in southern France in 1959. | BÀI BÁO KHOA HỌC SIMULATING MALPASSET (FRANCE) DAM-BREAK CASE STUDY BY A TWO-DIMENSIONAL SHALLOW FLOW MODEL Le Thi Thu Hien1, Ho Viet Hung1 Abstract: The paper is dedicated to researching a numerical model for dam-break simulation, which is verified through a comparison between calculated results and observed data of two reference tests. The numerical model is applied to simulate the flooding wave for the Malpasset dam-break event, which occurred in southern France in 1959. This event is a unique opportunity for code validation due to the availability of extensive field data on the flooding wave. In this research, Finite Volume Method (FVM) is applied to solve Two-Dimensional Shallow Water Equations (2D SWE) on structured mesh. Also, flux difference splitting method is utilized to construct numerical solvers of SWE. Keywords: Finite Volume Method; Flux difference Splitting Method; Malpasset (France). 1. INTRODUCTION1 Finite Volume Method is considered as the most applied numerical strategy to simulate most complicated shallow water flow phenomena, for instant: transcritical and supercritical flows, discontinuous type flow or moving wet/dry front, etc. Besides, the numerical simulation of natural case study is characterized by several problems, such as: complex geometry, high roughness coefficient. Dam-break problem over real geometrical irregularities and rough bottom is always a big challenge in simulating flood wave on downstream. Thus, a stable algorithm, can work with 2D meshes and provided with shock-capturing ability is needed (Valiani et al, 2002). The effectiveness and robustness demonstrated by comparing numerical results with observed ones of the reference test cases, indicating good application aspects is an important goal of this project. A well-known test case Malpasset (France) which has experiment data is applied to obtain hydraulic characters: water hydrographs, maximum water level or arrival time at survey points and inundation maps at certain .

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