资料匮乏地区小流域洪水汇流参数移用分析

Diverting Use Analysis of Flood Confluence Parameters in Small Watersheds Lacking Hydrologic Data

以下垫面条件相似的小区域为分析单元,分析了区域内各单站洪水汇流参数,既考虑变雨强对洪水汇流参数的影响,同时又考虑了汇流参数的外延。在此基础上,建立了洪水汇流参数与流域地理特征量之间的关系,并以此作为推求资料匮乏地区小流域洪水汇流参数的依据。分析结果表明,选用的流域特征具有汇流成因的概念,拟合的数学表达式符合径流形成原理,求得的参数具有明确的物理意义。检验结果亦表明,估计的汇流参数具有一定精度,估算的设计洪水满足设计要求,可供类似地区涉水工程洪水分析计算参考。

Small areas in the kindred land surface were used as the analytical unit, and the flood confluence parameters from every station were also analyzed. The influence of the flood confluence parameters from changing rainfall intensity and their extension were considered. And then, the connection of flood confluence parameters and geographic characteristic of watersheds was established, furthermore, it was used as basis to inquire the flood confluence parameters in small watersheds lacking hydrologic data. The analysis shows that, the chosen watersheds have concepts of confluence cause formation, and the fitting mathematical expression conforms to the principle of runoff forming, moreover, the obtained parameters have the unambiguous physical significance. The check results also indicated that the estimated flood confluence parameters have certain precision and the estimated design flood satisfies the design requirements. Therefore, it may be used as computation reference to flood analysis about water-related project in the similar areas.