关键词: 洪涝灾害;风险评估;GIS;信息熵;AHP;组合权重;赣州市;

Abstract: To conduct scientific and effective risk analysis on flood disasters and to reduce flood losses, taking Ganzhou City in Jiangxi Province as an example, based on disaster risk theory, we built a flood risk assessment system by selecting multi-source environmental flood regulation factors and socio-economic parameters in terms of risk, sensitivity and vulnerability.With the help of geographical processing and spatial analysis functions of GIS,a weight distribution map was drawn by combining information entropy and AHP method.A distribution map of flood disaster risk grade in Ganzhou City was given, and the flood disaster risk was assessed.The results show that the flood risk in Ganzhou City is distributed in a stretch shape, and the high risk area and the second high risk area account for 9.7% and 21.8% of the total area respectively, of which the high risk area is mainly distributed in Ningdu, Shicheng and Ruijin in the northeast of Ganzhou City, Zhanggong District in the center of Ganzhou City and Quannan, Longnan and Xunwu in the southern Ganzhou City.The evaluation results are basically consistent with historical disaster data.This study can provide theoretical support for urban flood control governance and risk management.

Key words: flood disaster; risk assessment; GIS; information entropy; AHP; combined weights;