入汇角60°时入汇口泥沙淤积试验研究

Experimental Study of Sediment Deposition for Open Channel Confluence at Junction Angle 60°

通过水槽试验研究了山区大比降河流入汇口淤积情况,探讨了入汇角为60°时泥沙淤积的形态及泥沙淤积与水流、输沙率的关系。试验结果表明,泥沙的淤积位置与淤积体高点随汇流比的变化而变化,泥沙淤积抬高入汇口上游的水位且随汇流比增大抬升越明显,亦增加了河道推移质输沙率。

The sediment deposition of large gradient of open channel confluence at junction angle 60° with different discharge ratios are studied in the channel model test. The test results show that the location of sediment deposition and the high-point of deposition changes with different discharge ratios;the sediment deposition raises the upstream water lev- ell as the discharge ratio increases, the lifting height is more obvious; at the same time, the lifting water level will impact on the transport sediment rate of the bed-load.