【摘要】 在求取漳河流域雨洪曲线,分析流域历史暴雨洪涝风险个例基础上,确定流域致灾临界面雨量和洪涝风险水位段。采用耿贝尔极值I型分布法求取流域不同重现期面雨量,基于GIS的暴雨洪涝淹没模型,利用D8及曼宁公式计算不同重现期面雨量淹没范围和水深;运用灾害风险原理,制作漳河流域暴雨洪涝风险区划。同时,对湖北省钟祥市行政区域制作了风险区划图,并与实际灾情进行了比较,暴雨洪涝灾害频发区与高风险区对应较好。结果表明,该方法能够直观表达暴雨洪涝灾害的形成,也反映了流域及研究区域内的暴雨洪涝灾害风险,有较清楚的物理意义。更多还原

【Abstract】 Based on acquiring rainflood curve of Zhanghe River Basin and analyzing cases of historical rainstorm flood disaster risk,the disaster critical area rainfall and flood risk water levels of the river basin are obtained:The Gumbel I extreme distribution is used to calculate the area rainfall of different return period, and D8 and Manning’s formulas are also used to calculate the submerged area and depth of areal precipitation from different recurrence interval by GIS rainstorm flood inundation model.According to disaster risk theory,the rainstorm flood disaster risk regionalization of Zhanghe River Basin is done.Meantime, a plot of rainstorm flood disaster risk zoning of Zhongxiang City in Hubei Province is performed,and compared with the actual disaster situation,the flood disaster areas and high risk areas are correspondent. The results show that the method can express flood disasters intuitively,and also reflect the flood disaster risk of the basin and the study areas.It has a clear physical significance.更多还原