水沙条件对黄河下游游荡型河道的影响

Influence of Silt-Discharge Condition to Braided Channel of the Lower Yellow River

分析了水沙条件对黄河下游游荡型河道的影响,认为水流能量减少是泥沙沉积、岸坡冲刷的根本原因。同时指出:利用三门峡、小浪底等水库可以大大提高下泄水流的能量,形成更好的河相关系;对河岸地质条件较差,尤其岸坡土体抗剪能力差的地段,应修建水工建筑物,人为提高这些河岸的抗冲刷能力;对某些弯曲型河道进行截弯取直,减小水流对河岸的冲刷。

The paper analyzes the influence of silt-discharge condition to the braided channel in the lower Yellow River and deems that the reduction of stream energy is the basic reason of sedimentation and dyke erosion.It also points out that it can greatly increase the energy of water discharge and form a better river facies relation;build hydraulic structures on the section where geological condition is poor especially the poor of shearing resistance of the soil mass of slopes,artificially increasing the capability of resistance to erosion and;straighten the channel where is curved reach for reducing scour to banks.