汾河兰村至义棠河段的洪水特性分析

The flood characteristic analysis in the section of the River from Lan Village to Yi Tang

为更详细了解汾河流域洪水灾害发生的情况,本文选取汾河兰村至义棠河段的洪水进行特性分析。结果表明:研究区段洪水主要集中于7—8月,占到了77.4%;上游站点的洪峰流量大于下游站点的洪峰流量且成正相关,其中二坝洪水受兰村或芦家庄洪水及其他区间暴雨洪水的共同影响,义棠洪水主要来源于上游二坝;研究区域上游洪峰与传播时间相关性较好,上游洪峰越小,传播时间越长,对于中上部,兰村—汾河二坝和芦家庄—汾河二坝的洪水规律有一定的差异。

In order to obtain the more detailed information of the flood disaster situation in the fen-he river, the flood features of fen-he river from Lan Village to YiTang is selected to analyze. The results show that the flood of the study area is mainly appeared in July and August, accounted for 77.4%. In light of peak flow, the peak flow in the upstream site is greater than that in the downstream site and they are positively related. The floods of the Lan Village and Yi Tang and other interval storm floods have a combined effect on the flood in the second dam of the fen-he The flood of YiTang mainly comes from the upstream site. There is a good correlation between the upstream flood peak and the transmission time ,the smaller the upstream flood peak ,the longer transmission time. For the upper part of the river, there are certain differences between Lan Village to the second dam of the fen-he and Lu Jiazhuang to the second dam of the fen-he in flood law.