湖北省山洪灾害风险区的划分研究

Study on the Division of Mountain Flood Disaster Risk Zone in Hubei Province

摘要: 本文选取影响山洪灾害发生的降雨量、平均坡度、河网密度、相对高差等因子进行权重叠加，得到湖北省山洪灾害危险性程度图。以人口密度和人口经济暴露性为指标进行易损性分析，将危险性程度图与易损性图进行叠加，得到湖北省山洪灾害风险区划图。在传统的研究办法的基础上，采用遥感图像结合山洪灾害普查信息，较充分的考虑了影响行洪过程的土地使用类型、植被情况、土壤利用率等信息，使得区划结果更加合理、可靠。对比历史山洪灾害资料发现，此次山洪灾害风险区划具有一定的精度。据此结果可对山洪灾害危险区进行规划，从而减轻山洪灾害的影响，同时也为当地居民提供了灾害的风险信息。

Abstract: In this paper, the factors influencing the occurrence of mountain torrent disasters, such as rainfall, average slope, river network density and relative height difference, are selected and weighted to get the map of mountain torrent disaster risk degree in Hubei Province. The vulnerability analysis was carried out with population density and economic exposure as indicators. The hazard degree map and vulnerability map were superimposed to obtain the risk zoning map of mountain torrents in Hubei Province. On the basis of traditional research methods, remote sensing images combined with mountain torrent disaster census information are used to take full account of land use types, vegetation conditions, soil utilization and other information affecting flood discharge process, which makes the zoning results more reasonable and reliable. Comparing the data of historical torrential flood, it is found that the risk zoning of mountain flood has certain accuracy. Based on these results, the risk areas of mountain torrents can be planned, so as to mitigate the impact of mountain torrents, and provide disaster risk information for local residents.