黄河口水沙变异及尾闾河道的萎缩响应

Variation of flow and sediment and atrophy response of tail channels in the Yellow River Estuary

1986年以来,进入黄河口的水沙过程发生了变异,尾闾河道逐渐萎缩,河道泄洪能力降低,对黄河防洪安全构成了极大的威胁。本文依据清水沟流路实测资料,采用对比分析、理论探讨等方法,揭示了黄河口水沙过程的变异特征,分析了尾闾河道萎缩的演变过程,概化了尾闾河道的萎缩模式,探求了尾闾河道的萎缩机理,引入了尾闾河道萎缩的判别指标。

The variation of flow and sediment condition in the Yellow River estuary since 1986 resulted in the atrophy of tail channels, the decrease of ability to convey flow, and more austere of flood prevention. Based on the measured data in Qingshuigou waterway, the variation characteristics of flow and sediment are investigated by using contrast analyses and theoretical study, including the atrophy processes of tail channels, the generalized atrophy modes, the atrophy mechanism, and the criterion index to judge the atrophy of tail channels.