中国洪水灾害危险程度空间分布研究

在前期中国洪水灾害危险程度区划的基础上，叠加全国GDP密度分布图重新聚类制作出中国洪水危险程度区划图，并将区划由原来的八级改成五级，通过前后两种结果的比较，说明区划时考虑GDP更合理．对区划结果按流域进行了洪水灾害危险程度的空间分布分析，结果表明：中国洪水灾害危险最大的地区主要集中在七大流域，尤其是这些流域的中下游平原区．根据中国水灾年表和前人的分析结果两种方法对结果进行了检验，证明本区划结果基本合理．

Spatial distribution of flood hazards in China

Based on the regionalization of flood hazard risk in China done in former research, the map for regionalization of flood hazards in China was reproduced by overlaying of the GDP distribution, and the flood regionalization, originally classified into 8 grades, was converted into that of 5 grades according to the opinion of specialists. The comparison of the two zoning results shows that it is more reasonable to take GDP into account. The spatial distribution of flood hazards was analyzed according to the result of flood regionalization for different river basins. It is concluded that the most dangerous flood disasters mainly concentrate in seven large river basins, especially in the plain regions on the middle and lower reaches of these river basins. By comparison with the former research and the chronological table for flood hazards in China, the rationality of the flood regionalization presented in this paper is verified.