摘要
河流交汇区作为河流系统的关键组成部分,展现了复杂的水动力学特征和床面形态的三维变化。本研究通过室内水槽试验探讨了不同低含沙量条件的河流交汇区水流特性的分布特征。设置了四种含沙量工况,利用声学多普勒点式测速仪(ADV)对流速进行精准测量,并对数据进行降噪处理。试验结果表明,随着含沙量的增加,交汇区流速分区特征发生显著变化,流速梯度和最大流速区域的范围均有所扩大,流体动力学特性及流体间的相互作用增强。此外,当含沙量在4.2~7.4 kg/m^(3)时,泥沙对湍流的抑制效应并不明显。这些研究结果为深入理解河流交汇区的水动力过程与泥沙运动提供了重要的理论依据。
The confluence area of rivers,as a key component of river systems,features complicated hydrodynamics and three-dimensional changes in bed morphology.This study conducts a laboratory water tank experiment of a river confluence and examines the distribution characteristics of its water flow under the condition of low sediment concentration.Four concentration conditions are tested,flow velocity is measured using an Acoustic Doppler Velocimeter(ADV),and the data is denoised.Results show that with an increasing concentration,velocity zoning characteristics in the confluence vary significantly,and the ranges of the flow velocity gradient and the maximum-velocity-covered area are both expanded.This means the dynamic behaviors of fluid and the interactions between fluid layers are enhanced.We also found that in the concentration range of 4.2 to 7.4 kg/m^(3),the inhibitory effect of sediment on turbulence is insignificant.The results lay an important basis for a deeper understanding of the hydrodynamic process and sediment transport in a river confluence.
作者
吴亨
王添
程圣东
李占斌
柯刚刚
甄贇哲
WU Heng;WANG Tian;CHENG Shengdong;LI Zhanbin;KE Ganggang;ZHEN Yunzhe(State Key Laboratory of Water Engineering Ecology and Environment in Arid Area,Xi'an University of Technology,Xi'an 710048,China)
出处
《水力发电学报》
北大核心
2025年第11期57-65,共9页
Journal of Hydroelectric Engineering
基金
国家重点研发计划(2022YFF1300801)
西安理工大学博士创新基金项目(104-252072304)。
关键词
明渠交汇
含沙量
水流特性
ADV
水槽试验
confluence of open channels
sediment concentration
water flow characteristics
ADV
flume
