“92.8”高含沙洪水在黄河下游演进特性分析

“92.8”洪水位异常高的主要原因:一是前期连续几年枯水,造成河床严重淤积;二是本场洪水边滩淤积,河道过水面积减小。花园口站洪峰流量大于上站的主要原因是:主槽强烈冲刷,水位大幅度下降,漫滩水迅速回归主槽。

Analysis on the Characteristics of "August 92" Hyper-Sediment Concentration Flood Routing in the Lower Yellow River

There are two main reasons for extremely high water level of "August 92" flood:one is continuouslydry for years in the earlier stage,causing severe sedimentation on the river bed;another is that the flood-plains on the both sides are silted by the flood,reducing flow area of the channel.The main reasons of peakdischarge at Huayuankou Station greater than that of the upper station are that the main channel is scouredseriously,water level dropped greatly and the overbank water back to the main channel rapidly.