Hazards Assessment of Regional Debris Flows Based on Geographic Information Science

摘要

Supported by the spatial analysis feature of geographic information science and assessment model of regional debris flows,hazards degrees of the debris flows in the Upper Yangtze River Watershed(UYRW) are divided into five grades based on grid cell. The area of no danger,light danger,medium danger,severe danger and extreme severe danger regions respectively are 278 000,288 000,217 000,127 000,15 000 km2. Furthermore,the counties in the UYRW are classified into four classes based on the hazards degrees in each county. The number of severe danger,medium danger,light danger and no danger counties respectively are 49,82,77 and 105. The assessment results will be provided for the haz-ards forecasting and mitigation in the UYRW and ongoing region-alization of Main Function Regions in China as data and technique framework.