U形渠道中复合型量水堰结构设计与特性研究

Research on Composite Weir Structure Design and Characteristics of the U-Shaped Channel

灌渠测流仪器的合理应用是实现灌区节水灌溉的重要工程措施。基于薄壁堰流原理,提出了一种新型的复合型量水堰测流技术,以U50型渠道为例,采用理论分析和模型试验的方法,对不同流量工况下复合堰上游特征断面水力特性进行分析,并进一步率定校核了复合堰的测流经验公式。结果表明:该复合型量水堰测流精度较高,相对误差在4%以内,误差均值不超过2.3%;安装堰板时上游水深呈现逐渐增大的趋势,且在堰板处水深达到最大值。

The channel flow measurement by effective means is an important engineering measure to implement water-saving irrigation. Based on the principle of thin-walled weir,a novel compound weir flow measurement technology was put forward. Taking U50-type channel as an example,through theoretical analysis and model test method,this paper discussed the different flows of composite weir upstream hydraulic characteristics and acquired the empirical formula of composite weir. The results show that the composite weir flow precision is fairly accurate. Its relative error is less than 4% and the mean error is less than 2.3%. When the weir is placed in the channel,the upstream water depth will increase gradually and reach to the maximum at the weir.