黄河下游宽河段河床边界条件变化特征分析

Analysis of Boundary Condition Development Characteristics in the Lower Yellow River of Wide Channel

受水沙条件及人类活动的共同影响 ,黄河下游河床边界近年来发生了很大变化。通过对不同时期下游卫星照片、地形资料及河道横断面变化的分析 ,阐明了河道不同部位边界条件的变化特征 :与 5 0年代相比 ,近年来中水河槽尤其是主槽过洪宽度和过水面积明显减小 ,原本开敞通畅的滩区受生产堤及拦滩道路、渠堤的影响变得封闭不畅 ,滩唇高仰。

There have been great changes of boundary conditions in the Lower Yellow River in recent years owing to the influence of water and sediment development and human activities. Based on the analysis of satellite images of various periods, landform data and river channel transverse section evolution in the lower Yellow River, the characteristics of the river channel boundary condition changes at different location are clarified as middle flood channel flood transport width and area are evidently decreased especially for the main channel with comparison to 1950s; beach area that is unimpeded before become blocked because of road, irrigation channel constructed on it, and consequently intensify high edge of beach and lowering dyke and river.