明渠水沙条件对渗渠产水量影响分析

Influence of water and sand condition on water yield of open channel

针对渗渠取水过程中明渠水沙条件对渗渠产水量的影响,结合模型试验,运用泥沙运动力学理论研究分析了同种来水量、不同水深条件下明渠水流泥沙运动变化,以及由此引起渗渠产水量变化的情况。试验结果表明:水流能保持一定的流速,满足明渠水流含沙颗粒推移运动并实现泥沙颗粒向下游输送的条件,就可以避免渗渠反滤层结构的改变以及渗透系数的减小,从根本上防止反滤层淤塞,避免反滤层翻修,实现渗渠工程的长期安全正常运行。

The variation of water yield of a seepage channel caused by changes of open channel flow and sediment movement at different depths under unifoma discharge was analyzed based on the sediment movement theory and model test. The results show that holding the flow velocity at a certain value, which satisfies the transport condition for sediment moving towards lower reaches, can effectively reduce or even preclude the variation of the structure of the inverted filter and the decrease of the permeability coefficient. Thus, it can prevent the inverted filter from silting-up or overhauling and the seepage channel can realize long-tema safety operation.