库区交汇河段水动力特性试验

Experimental study of hydrodynamic characteristics at confluence reach in reservoir area

以辽宁大凌河白石水库库区交汇河段为研究对象,通过模型试验,研究不同因素影响下其水动力特性的变化。结果表明:库区交汇流河段水深沿程增加,过流面积沿程加大,交汇口以上干支流流速沿程增加,而交汇口以下流速呈现沿程减小的显著特征;在入汇口下游的支流同侧必然存在回流区,随着汇流比的增加,回流区范围增大;坝前水位升高时,交汇区内流速绝对值减小,沿程变化率减小,主流线弯曲程度加大,回流区范围增大。

This study investigated the change hydrodynamic characteristics at the confluence reach in Bai Shi Reservoir area in the Daling River with different factors,based on model testing. The results show that the water depth and flow area increase along the channel,and the flow velocity in the mainstream and tributaries upstream of the confluence zone increases along the channel as well,while the flow velocity downstream of the confluence zone decreases significantly along the channel. The backflow region occurs in the tributaries downstream of the confluence zone,and its range increases with the confluence ratio. When the water level upstream of the dam increases,the absolute value of the velocity and its change rate along the channel decrease in the confluence zone,while the degree of curvature of the main stream line and the backflow region range increase.