明渠交汇区水位变化特性试验研究

Experimental Study on Water-level Fluctuation Characteristics at Open Channel Confluence Zone

基于物理模型试验,探讨了天然河流交汇区水位变化特性,分析不同干支流来水条件下水位沿程变化、交汇区典型断面水位流量关系、交汇区泥沙起动流速变化等特性。结果表明,交汇区水位变化的强弱与干支流流量等密切相关,交汇区泥沙起动流速沿程变化与单一河道有明显差异。

The effects of discharge ratio between main channel and branch channel on the flow characteristics including the water-level fluctuation along the river,stage-discharge relation and incipient velocity at confluence zone were studied based on the physical model tests.The results indicated that the strength of water-level fluctuation at confluence zone was closely related to the discharge ratio between main channel and branch channel and river pattern,and incipient velocity variation along the river at confluence zone was obviously different from the one in single channel.