黄河小北干流河道冲淤演变规律研究

Study of evolution of erosion and deposition in Xiaobeiganliu reach of Yellow River

通过分析实测资料,探讨了黄河小北干流近几十年来的水文系列特点及河道冲淤演变规律,指出小北干流河段汛期淤积,非汛期冲刷,呈累计淤积状态。研究了河道冲淤量对来水来沙的响应关系,汛期冲淤量主要与汛期水量和沙量有关,非汛期冲刷量主要与非汛期水量正比。本文还建立了预测汛期冲淤量的BP网络算法,给出了小北干流河道不同来沙量时的合理输沙水量。

Based on analysis of field data,the characteristics of water and sediment transport and evolution of erosion and deposition in the Xiaobeiganliu reach of the Yellow River are discussed in the paper.It is found that the river channel experienced silting in flood periods and scouring in non-flood periods.The erosion and deposition had close relationship with the incoming runoff and sediment load.Besides,a model based on BP neural networks has been developed to calculate the scouring-silting quantity and gives the most economical water volume for sediment transport.