黄河下游河道萎缩过程中输沙能力的调整

Adjustment of sediment transport capacity during channel shrinkage for lower Yellow River

依据河床演变学原理,根据定位观测资料分析,结合河工动床模型试验,探讨了黄河下游河道萎缩过程中的输沙能力调整关系。研究表明:黄河下游河道主河槽的输沙能力调整趋势取决于河道的萎缩模式;主河槽水流挟沙力与河槽形态的关系仍然符合一般意义下的河床过程规律;河道萎缩后,河道的排沙比减小,但排沙比与河道萎缩模式无关;河道萎缩是可以逆转的。

According to the principle of riverbed evolution, with the observed data at certain stations, the method of movable bed model test was used to analyze the adjustment of water transport capacity during the channel shrinkage. The result shows that the adjustment of sediment transport capacity in the main river channel of the lower Yellow River mainly depends on the pattern of channel shrinkage, that the relationship between the sediment carrying capacity of flows and morphology of main river channel still accords with the law of riverbed evolution in general, and that the rate of sediment discharge decreases after channel shrinkage, however, there is not a certain relationship between the rate of sediment discharge and the pattern of channel shrinkage. Finally, it is concluded that channel shrinkage is reversible.