County-Level Flood Risk Level Assessment in China Using Geographic Information System

Flood disaster is the most one of the seven serious natural disasters in China. In order to provide technical support and reduce the losses caused by flood disaster, the paper made a study of risk level assessment in China. The study proposed a model assessmenting flood disaster risk level which could be used to evaluate the risk level of flood disaster in each county of China. Analytic Hierarchy Process (AHP) was used to determine the indicators of the model and their weights. This study calculates flood disaster risk level of each county in China and displays on the map based on Geographic Information System (GIS). The experiment indicates the flood disaster risk level in China increases from west to east, from north to south. The highest risk level is in Yuanjiang County, Jinxian County and Guangzhou area, which respectively in Hunan province, Jiangxi province and Guangdong province. In summary, the model assessmenting flood disaster risk level used in this study is a meaningful and could be used to explore flood disaster risk level not only in large scope but also in small scale.