双弧形导沙坎相对高度对取水口冲沙效果的影响

取水口前易发生泥沙淤积,泥沙进入输供水系统后可能会造成机组及管路损坏,常需设置拦排沙措施以避免泥沙进入。针对取水口的拦排沙问题,进行了新型双弧形导沙坎在较低水位运行条件下导沙坎体型参数、水动力条件对取水口前淤积泥沙冲刷效果的影响试验。结果表明,高度适宜的双弧形导沙坎有利于冲沙廊道内螺旋流的形成与发展,能有效减少泥沙淤积;冲沙效果与导沙坎相对高度、来流弗劳德数、螺旋流强度呈正相关关系。

Influence of the Relative Height of Double-arced Current Deflecting Wall on the Sand Flushing Effect in Front of Water Intake

Sedimentation is easy to occur in front of the water intake.When the sediment enters the water supply system,it may cause damage to the unit or pipeline.So,prevention/drainage measures are taken to avoid the entry of sediment.This paper proposes a new type of double-arced current deflecting wall for the problem of sand prevention/drainage at water intake,and has carried out physical model experiments about the effect of the geometric parameters of the current deflecting wall and the hydrodynamic condition on scouring sediment.Results indicate that the double-arced current deflecting wall with a suitable height is beneficial to the formation and development of spiral flow in the sand-scouring corridor,and effectively reduces sedimentation;The effect of sand scouring is positively correlated to the relative height of the double-arced current deflecting wall,Froude number,and spiral flow intensity.