Urban Debris Flow Risk Assessment Mode in Wenchuan Seismic Zone

Aimed at the lack of quantize risk assessment, and based on the lately research progress in risk assessment, this article put forward the method of semi-quantized value and calculation of debris flow risk. Then, this article taking Wenchuan urban which is one of the serious damage area in "5.12'Wenchuan' earthquake as an example, and adding the high resolution remote sensing image and GIS technology, applying the method put forward in this article in Nangu debris flow which located in the rear mountain of Wenchuan urban. This research can be useful for risk assessment theory and method, and can provide useful guide to debris flow risk control and management in Wenchuan seismic zone.