UNSTEADY FLOW WETTING DRYING CONDITION LEADING TO ZERO MASS ERROR. APPLICATION TO THE MALPASSET DAM FAILURE

摘要

In 1959 the Malpasset arc dam 12Km upstream Frejus on the French Riviera broke almost instantaneously releasing an amount of about 48 million m~3 of water [Vogel 1998]. The flood wave caused severe damages: 433 people lost their lives. Extensive investigations analyzing the catastrophe were undertaken. The police collected detailed observations of the flood wave propagation and its maximum elevations. In 1964 a 1/400 physical model was constructed at EDF-LNH (Chatou) in order to get a better understanding of the flooding process [Goutal 1999]. Nowadays, computational methods are able to simulate this flood wave. Calculations show that the wave arrival times and water elevations can be predicted with sufficient accuracy. Numerical results are obtained with a 2D explicit finite volume upwind technique. A new wetting-drying condition for unsteady flows is presented in this work.