半覆盖人工生态浮岛对明渠流水动力特性的影响  

Influence of Partially-covered Artificial Ecological Floating Island on Hydrodynamic Characteristics of Open Channel Flow

作　　者：杨帆[1] 李仟 曾玉红[1] Yang Fan;Li Qian;Zeng Yuhong(State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]武汉大学水资源工程与调度全国重点实验室,武汉430072 [2]黄河勘测规划设计研究院有限公司,郑州450003

出　　处：《水动力学研究与进展（A辑）》2024年第4期540-548,共9页Chinese Journal of Hydrodynamics

摘　　要：为了研究半覆盖人工生态浮岛对于明渠水流水动力特性的影响,该文采用水槽试验方法,开展了半覆盖人工生态浮岛作用下的水流试验。试验采用泡沫板模拟浮体结构,采用圆木棒模拟浮岛植物的水下根区,同时采用ADV测量水流紊动特性。建立了半覆盖浮岛水流的深度平均流速的横向分布模型,得到了深度平均流速的解析解,针对无因次涡流黏度、二次流系数和流速参数讨论了模型参数的敏感性,探究了不同横向位置处纵向流速垂向分布规律和深度平均紊动强度的横向分布规律。研究结果表明:该理论模型具有很好的可靠性和真实性;在浮岛区域交界面,纵向流速沿垂向先增大后减小,呈现出介于明渠流和浮岛水流的过渡流态,且紊动强度值最大。To investigate the influence of partially-covered artificial ecological floating island on hydrodynamic characteristics of open channel flows,flume experiments with partially-covered floating islands are conducted.Foam boards and wooden sticks are used to mimic the floating structure and vegetation roots respectively,ADV is used to measure the turbulent characteristics of flows.In this study,the transverse distribution model for depth-averaged velocities in flows with partially-covered floating islands is established,and thus the analytical solution for depth-averaged velocities is derived.Non-dimensional eddy viscosity,secondary flow coefficient,and velocity parameter are discussed for the sensitivity of model parameters.In addition,the vertical distribution law for longitudinal velocities at different transverse locations is investigated,as well as the transverse distribution law for depth-averaged turbulent intensities.Results show that the theoretical model presents good reliability and authenticity.At the interface of floating island zones,longitudinal velocities increase first and then decrease in the vertical direction.Present transitional flow states between open channel flows and floating island flows,and turbulent intensities reach the maximum value.

关 键 词：半覆盖人工生态浮岛 深度平均流速 横向分布模型 紊动强度 明渠流 

分 类 号：TV133[水利工程—水力学及河流动力学]