论文部分内容阅读
横跨河床的砂防坝，势必存在限制鱼类活动的弊端。缝隙坝常因阻塞而失去作用。为此提出侧向溢流堰控制泥沙的设计方案。重点研究其分流作用、拦截泥沙作用。共设３个因素（堰长Ｌ、堰高Ｄ、堰宽Ｂ），１０个处理。研究结果表明：分流比Ｑ２／Ｑ０。与高深比Ｄ／ｈ没有相关关系。但在Ｄ／ｈ相同条件下，随Ｌ的增加，Ｑ２／Ｑ０。有增加的趋势。而Ｑ２／Ｑ０与Ｌ／Ｂ回归方程为Ｑ２／Ｑ０＝０．０５５Ｌ／Ｂ。排沙比Ｖ１／Ｖ０与Ｑ１／Ｑ０相关分析结果与Ｄ无关。从主槽排向侧槽的沙量取决于Ｌ。河床纵断变化为Ｌ越长，堰上跨越易冲刷，下游越易出现沉积。横断变化当Ｄ＝０时，堰区及侧槽有泥沙沉积；当Ｄ＝２ｃｍ时，在堰附近产生沉积。利用侧向溢流堰的分流作用，可以起到在主槽内控制泥沙作用。但在侧槽也存在泥沙沉积现象。因此，如何对堰长、堰高、及主、侧槽宽度进行设计，使泥沙只在主槽内沉积将是今后研究的课题。
Sand and dam across the riverbed, there are bound to limit the drawbacks of fish activities. Slit dams often lose their effect due to blockage. Therefore, the design scheme of sediment control by lateral weir is proposed. Focus on the diversion of its role in intercepting sediment. A total of three factors (weir length L, weir height D, weir width B), 10 treatment. The results show that: split ratio Q2 / Q0. And higher than D / h is not related. However, under the same conditions of D / h, with the increase of L, Q2 / Q0. There is an increasing trend. The Q2 / Q0 and L / B regression equation Q2 / Q0 = 0.055L / B. Sediment ratio V1 / V0 and Q1 / Q0 correlation analysis has nothing to do with D. The amount of sand discharged from the main tank to the side tank depends on L. Longitudinal changes in the river bed for the L longer, easy to wash across the weir, the more prone to sediment downstream. Transect change When D = 0, weir and side trenches have sediment deposition; When D = 2cm, deposition occurs near the weir. The use of lateral overflow weir diversion effect, can play the role of sediment control in the main tank. However, there are also sediment deposition in the side tank. Therefore, how to design the weir length, weir height, and the width of the main and side grooves so that the sediment will only deposit in the main groove will be the subject of future research.