Experiment on Free Overfall Measuring Flume in Rectangle Canal

chenxiaopan; 刘超; Lilongguo

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Experiment on Free Overfall Measuring Flume in Rectangle Canal

更新时间：2023-11-14

- Experiment on Free Overfall Measuring Flume in Rectangle Canal
- Advanced Engineering Sciences Vol. 47, Issue Z1, Pages: 1-6(2015)
- 作者机构：
  
  四川大学水利水电学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2015，
  
  Published Online：30 November 2014，
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陈小攀,李乃稳,刘超,李龙国.矩形明渠跌水量水试验研究（研究生论坛稿件）[J].工程科学与技术,2015,47(Z1):1-6.

chenxiaopan, 刘超, Lilongguo. Experiment on Free Overfall Measuring Flume in Rectangle Canal. [J]. Advanced Engineering Sciences 47(Z1):1-6(2015)
陈小攀,李乃稳,刘超,李龙国.矩形明渠跌水量水试验研究（研究生论坛稿件）[J].工程科学与技术,2015,47(Z1):1-6. DOI：

chenxiaopan, 刘超, Lilongguo. Experiment on Free Overfall Measuring Flume in Rectangle Canal. [J]. Advanced Engineering Sciences 47(Z1):1-6(2015) DOI：

摘要

中文摘要: 明渠设置跌坎后形成自由跌落水流，其跌坎水深与明渠临界水深之比近似为一定值，即EDR(end-depth/critical-depth)，利用这一关系可实现明渠流量的计量。EDR值与明渠的底坡和糙率系数有关。本文结合工程实际，利用模型试验对渠道底坡和糙率对EDR的影响进行了研究，并同国外的研究成果进行了比较。试验结果表明：随着坡度的增加，EDR逐渐减小；随着糙率的增加，EDR逐渐增大；试验数据资料表现出极好的相关性，相关系数为0.9830；根据本试验结果并结合国外试验结果，提出了矩形明渠测流的经验公式，流量计算平均相对误差小于1.35%。

Abstract

Abstract:In open channels

free overfall is a situation where the flow separates from the rigid bed to form a free nappe due to a sudden drop in the channel bed

the relationship of the end-depth to the critical depth is constant

it could be used as a simple flow measuring device. EDR is dependent of roughness and slope. This paper study the effect of roughness and slope on EDR

associating with practical condition. The experiment results show that EDR decreased with the increase of slope degree; EDR increased with the increase of roughness and experimental data are closely correlated with the correlation .The discharge formula established according to the experimental result in this paper and the experimental result abroad，and the mean error of discharge calculating results is less than 1.35%

关键词

矩形明渠、流量测量、自由跌水、试验

Keywords

rectangular open canaldischarge measurementfree overfallexperiment

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