Risk Grade Evaluation of Debris Flow Based on GIS: Take Qu Shui County as an Example

Debris flow is one of the most common geological disasters in China. Because of its complex mechanism, rapid disaster formation and great destruction, once it breaks out, it will seriously threaten people's production, life and property safety. One of the responsibilities and missions of the armed police force is rescue and disaster relief. How to minimize the harm of debris flow to people's lives and property safety is one of the key problems to be solved by the armed police force. In this paper, catastrophe progression and information model are used to determine the evaluation index system of debris flow risk grade, and the two index systems are used to complete the risk equivalent evaluation of debris flow disaster in Qushui county. The comparative analysis method is used to find out the risk evaluation index system suitable for the geographical environment characteristics of Qushui County.