Sensitivity Analysis of Avalanche Simulation Parameters Based on RAMMS-AVALANCHE Model
A three-dimensional digital terrain model was built to simulate the avalanche movement process in the avalanche danger zone of the Gongnaisi continental climate as the research background.To study the influencing factors of the numerical simulation results of RAMMS avalanches,and to analyze the influence and sensitivity of the three-parameter values of computational grid resolution,snow fracture depth,and friction coefficient on the simulation results.The influence degree of the three parameters was obtained by comparing the simulation results under different parameters through the single factor analysis method,and the sensitivity of the parameters to the simulation results was analyzed by the grey correlation method.The results show that choosing an appropriate computational grid resolution improves the accuracy of the simulation results;the rate of change of flow height is in the range of 5％to 7％for every 10％reduction in the depth of snow fracture.The rate of change of flow velocity is in the range of 1％to 2％.The rate of change of impact force is in the range of 2％to 3％,and the magnitude of friction coefficient mainly has a large impact on the eigenvalues of the accumulation zone and the avalanche stopping time,and has a smaller impact on the eigenvalues of the kinematic process.On this basis,sensitivity calculations were carried out,based on the calculations'results to determine the parameters'primary and secondary relationships at the time of the maximum influence of each eigenvalue.The research results clarify the sensitivity of the input parameters of avalanche simulation,which can effectively improve the rationality of the selection of parameters and the accuracy of the calculation results of avalanche numerical simulation,and provide a basis for the analysis of avalanche disaster risk level.
万方数据
维普
