CHARACTERISTICS OF STATIC AND DYNAMIC RESISTANCE OF ONE-DIMENSIONAL DEBRIS FLOW AND ITS NUMERICAL SIMULATION

Debris flow is one of the common mountain hazards and seriously threatens human lives and belongings and affects society development. Therefore,it is necessary to study more about its happening and development. The approach of combining the dynamic model equations with the use of the numerical methods can lead to in-depth understanding of the development of debris flow. This is an effective approach to study and forecast the debris flow disasters. However,a majority of the present dynamic model equations focus on the dynamic process,and ignore the combination of the static and dynamic process. In fact,this neglect may result in some mis-leading results under some condition. In this paper,the characteristics of static and dynamic resistance of one-dimensional debris flow are studied. By modifying the friction resistance term of the kinetic equation,the model equation is obtained for the uniform characteristic of static and dynamic. Based on the approximate Riemann solver of Roe scheme,the numerical solution with higher precision and resolution is achieved by use of MUSCL linear reconstruction.The numerical validation of an actual example proves the rationality of the modification of friction resistance term and the stability and effectivity of the developed numerical calculation.