水库及河道整治对黄河下游游荡性河道河势演变的影响

Effects of reservoir and training on river regime evolution of the braided reach in the lower Yellow River

研究了修建水库及河道整治对黄河下游白鹤镇至高村游荡性河道河势演变的影响,探讨了游荡性河道向弯曲性河道转化的可能性。认为经过水库调节后,进入下游的来沙量减少,洪峰削平及中水持续时间加长,有利于游荡性河道游荡程度的降低及向弯曲方向的发展;河道整治工程对于减小河道的摆动强度,稳定流路,促使河道由游荡向弯曲方向发展的作用是显著的。在小浪底水库下泄有利水沙条件下,若能利用现有的河道整治工程,并补充必要的河道整治措施,黄河下游游荡性河道有可能逐步转化为象高村至陶城铺河段那样的限制性弯曲河道。

The effects of reservoir and training on river regime evolution of the braided reach in the lower Yellow River from Baihezhen to Gaochun is studied based on theoretical analysis and experimental data. The possibility of the river regime changing from braided to meandering is discussed. It is concluded that the existence of reservoir may result in the reduction of flood peak magnitude and decrease of sediment supplied to the downstream, which is in favor of forming a sinuous river. Whereas, river training works will reduce the intensity of channel sifting and promote the formation of a more stable main channel, thereby, accelerate the change of river regime from braided to sinuous. In view of the fact the Xiaolangdi Reservoir is put into operation, it is entirely possible for the lower Yellow River changing from braided into sinuous if necessary training works are added.