Simulasi Numerik Perambatan Banjir Akibat Keruntuhan Bendungan Dengan Metode Volume Hingga-Cell Center

Abstract

. This paper describes a numerical model to simulate the phenomenon of flooding due to dam collapse. This phenomenon needs to be studied because of catastrophic dam collapse could inflict damage and cause casualties. Numerical model developed is based on cell-centered finite volume method with explicit time step that works on an irregular grid system. The method used by this volume, which was first developed to solve the Euler equations Compressible which is further modified to solve the equation St. Vennant two-dimensional hydrodynamic equations derived from the shallow waters equations. In this numerical model, the discretization space is solved using the method of volume to cell centered scheme (cell-centered finite volume method) and the integration time is solved using the Runge-Kutta method stratified. To dampen numerical oscillations that may arise due to lack of diffusion terms was overcome using artificial numerical dissipation. For wall boundary conditions, no flow through the wall condition was implemented, and for flow boundary conditions, the method of flow characteristics was implemented. Comparative study of the results of the model application were done for case-flow due to the collapse of the dam and surface runoff. Comparison of the results with the results of experiments and other numerical model results shows a good results agreement. This paper also discusses the results of application of the model to predict the propagation of the flow due to the hypothetical case of a dam collapse disaster Lawe-lawe dam. A case study is required for mitigation in the event of collapse of Lawe-Lawe dam