关键词: GIS, 层次分析法, 洪涝灾害, 风险评估

Abstract:

The assessment of the flood disaster risk using the GIS technology can make up for the lack of spatial display by traditional assessment methods. According to the occurrence characteristics of flood disasters in Zhejiang province, considering the aspects of danger and vulnerability, several factors influencing flood disasters, including rainfall, topography, river network density, population density and percentage of cultivated land, et al were selected. The factors were spatialized using the GIS spatial analysis technology, and the weight of each factor was determined using the analytic hierarchy process (AHP), after which the flood risk assessment map was obtained and a flood disaster risk assessment system of Zhejiang was built based on the Supermap iObjects platform. The results show that the flooding risk in Zhejiang province is generally high, with the highest risk areas located in the coastal areas in the north and the southeast, the higher-risk areas located in the east and the north, the middle of the south Zhejiang and the Jinqu basin, the medium-risk areas located in the west, north, and western Zhejiang province. The analysis results can provide reference for the prevention and management of flood disasters in Zhejiang province.

Key words: GIS, analytic hierarchy process, flood disaster, risk assessment