U形渠道斜坎量水堰水力性能试验研究

发布时间：2018-03-16 19:09

本文选题：U形渠道　切入点：量水堰　出处：《中国农村水利水电》2017年10期 　论文类型：期刊论文

【摘要】：针对底坡大于1/200的U形渠道的量水设施匮乏,设计了一种斜坎量水堰,通过在U形渠道上对9种不同体型斜坎量水堰在8种流量下的72组过堰水力性能原型试验,分析了水面线变化趋势、堰高及量水堰坡度对上游壅水高度的影响,研究了各断面水深与流量的关系。结果表明:量水堰上游坡度和堰高对水面线、上游壅水高度影响较大,且堰高的影响大于量水堰坡度对其的影响;建立的斜坎量水堰测流公式精度较高,在量水堰堰高大于5 cm时误差基本分布在±8%以内。量水堰建议堰高P小于10 cm,堰长L为堰高P的10~12倍。
[Abstract]:In view of the shortage of water measuring facilities in U-shaped channel with bottom slope greater than 1/200, a slanting sill Weir was designed, and 72 groups of overweirs with 9 different types of slanting sill Weir under 8 different flow rates were tested on U-shaped channel. The variation trend of water surface line and the influence of Weir height and Weir gradient on backwater height are analyzed. The relationship between water depth and discharge of each section is studied. The results show that the upstream slope and Weir height have a great influence on the water surface line and the backwater height upstream. The influence of Weir height is greater than that of Weir slope, and the accuracy of the formula established for measuring the flow of slanting sill Weir is higher than that of the measured Weir. When the Weir height is more than 5 cm, the error distribution is within 卤8%. The recommended Weir height P is less than 10 cm, and the Weir length L is 10 ~ 12 times of Weir height P.
【作者单位】：西北农林科技大学旱区农业水土工程教育部重点实验室;
【基金】：公益性行业(农业)科研专项(201503125) “十三五”国家重点研发计划(2016YFC0400200)
【分类号】：TV135

【相似文献】