Study on danger evaluation of debris flow using extension method

This paper introduced the extension method and established a danger evaluation matter-element model based on debris flow surveying data of Miyun county. The research indicates that it is reasonable and feasible for using extension method in danger division of valley debris flow. It can reflect each factor´s influence on danger of valley debris flow. This paper used simple correlation function to determine the weight, which can avoid the effect of subjective factor in practice.