桥墩阻水比对弯道河流流速分布的影响  

Influence of Piers Water Resistance Ratio on Velocity Distribution in Curved River

作　　者：黄靖轩 陶涛 孙小双 路明 汪海伦 HUANG Jing-xuan;TAO Tao;SUN Xiao-shuang;LU Ming;WANG Hai-lun(School of Water Conservancy and Hydroelectric Power,Hebei University of Engineering,Handan 056001,China;Zhanghe Upstream Administration Bureau of Haihe River Water Conservance Commission,Handan 056001,China;Beijing Green Land High-Tech Co.,Ltd.,Beijing 100089,China)

机构地区：[1]河北工程大学水利水电学院,邯郸056001 [2]海河水利委员会漳河上游管理局,邯郸056001 [3]北京国土丹青工程技术有限公司,北京100089

出　　处：《科学技术与工程》2022年第22期9781-9789,共9页Science Technology and Engineering

基　　金：河北省自然科学基金(E2019402102)。

摘　　要：桥墩阻水比是确定涉河桥梁工程方案主要考量指标之一。为研究桥墩阻水比对弯道河流流速分布的影响,建立有机玻璃弯道水槽模型,针对不同阻水比桥墩对弯道河流流速分布影响开展试验研究。使用声学多普勒流速仪(acoustic doppler velocimeter, ADV)采集弯道试验段内的纵向和横向流速并进行分析,结果表明:随阻水比的增大,桥墩附近上下游主流位置趋于集中在水槽中间。在弗劳德数Fr=0.21和Fr=0.28两组工况下,墩前断面纵向流速方差均减小,其流速分布更加均匀;墩后断面纵向流速方差均增大,其流速分布更加紊乱;横向流速在墩前与墩后分布均更加紊乱。桥墩阻水比对纵向流速和横向流速分布的影响均随Fr增大而减小。The piers water resistance ratio is one of the main consideration indexes for determining the engineering scheme of river related bridge. In order to study the influence of piers water resistance ratio on velocity distribution in curved river, a plexiglass curved flume model was established. An experimental study was carried out to study the influence of piers with different water resistance ratio on the velocity distribution in curved river. Acoustic doppler velocimeter(ADV) was used to collect and analyze the longitudinal and transverse velocity within the curved test section. The results show that with the increase of water resistance ratio, the upstream and downstream mainstream positions near piers tends to be concentrated in the middle of the flume. Under the conditions of Fr=0.21 and Fr=0.28, the variance of longitudinal velocity in front of piers decreased, and the velocity distribution becomes more uniform. The variance of the longitudinal velocity behind piers increases, and the velocity distribution becomes more disordered. The distribution of transverse velocity in front of piers and behind pier is more disordered. The influence of piers water resistance ratio on longitudinal and transverse velocity distribution decreases with the increase of Fr.

关 键 词：弯道水流 桥墩阻水比 主流 纵向流速 横向流速 

分 类 号：TV131.655[水利工程—水力学及河流动力学]