GAME THEORY AND K-MEANS ALGORITHM BASED COMPREHENSIVE SUSCEPTIBILITY ANALYSIS OF CATCHMENTS FOR DEBRIS FLOWS IN MOUNTAINOUS AREA OF BEIJING

Susceptibility analysis is an effective method to obtain characteristics of developments of catchment. There is a concomitant or alternate pattern of flash flood and debris flow in the mountainous area of Beijing. Consideration of hazard of debris flow alone cannot match the requirement of disaster prevention and control in the mountainous area of Beijing if causing factors of flash flood are neglected. In this research, we adopt the evaluation factors of flash flood in the susceptibility analysis of debris flow. Ten catchments in Beijing mountainous area are investigated. Analytic hierarchy process and entropy method are used for subjective and objective weighting. Combination weighting is calculated by game theory. The susceptibility of catchments is divided into slight, moderate and severe scale by K-means algorithm. Field investigation is used to check the results of scaling. The result shows that susceptibility analysis considering factors of flash flow fits the characteristics of disasters in the mountainous area of Beijing.