全覆盖人工生态浮岛对明渠流水动力特性的影响  

Influence of Fully-covered Artificial Ecological Floating Islands on Hydrodynamic Characteristics of Open Channel Flow

作　　者：杨帆[1] 李仟 吴珈莹 曾玉红[1] Yang Fan;Li Qian;Wu Jiaying;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5期746-755,共10页Chinese Journal of Hydrodynamics

摘　　要：为了研究全覆盖人工生态浮岛对于明渠水流水动力特性的影响,该文采用水槽试验的方法,开展了全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。将全覆盖生态浮岛作用下的水流在垂向上分为靠近水槽底部的间隙层和上方的浮岛层,建立了纵向流速和雷诺应力分布的双层模型,得到了纵向、横向和垂向紊动强度的垂向分布规律,三项紊动强度均在浮岛底部达到最大值,并应用混合层的概念得出了适用于不同浮岛淹没度的入侵深度公式。此外,基于实测数据的频谱分析得出双层交界处存在明显的剪切涡,而浮岛层则主要受到茎干尺度涡的影响,基于象限分析得出了间隙层的内向交互大于外向交互作用,而浮岛层的外向交互大于内向交互作用。To investigate the influence of fully-covered artificial ecological floating islands on hydrodynamic characteristics of open channel flows,flume experiments with fully-covered floating islands are conducted in this study.Foam boards and wooden sticks are used to mimic the floating structure and vegetation roots respectively,with ADV used to measure the turbulent characteristics of flows.In this study,flows with full-covered ecological floating islands are vertically divided into the gap layer close to the flume bottom and the floating island layer above.Thus,the two-layer models for the vertical distribution of longitudinal velocities and Reynolds stress are established.The vertical distribution laws for the longitudinal,transverse and vertical turbulent intensities are obtained,which reveal that the three turbulent intensities achieve the maximum value at the bottom of the floating island layer.By adopting the concept of mixing layers,the formula for invasion depth which is suitable for different submergence is obtained.In addition,based on the measured flow fields,the spectrum analysis finds that shear vortices form at the interface of the two layers,and the floating island layer is mainly affected by the stem-scale vortices;the quadrant analysis finds that in the gap layer,the introverted interaction effects are stronger than the extroverted interaction effects,and vice versa in the floating island layer.

关 键 词：全覆盖浮岛 流速分布 雷诺应力 紊动强度 明渠流 

分 类 号：TV133[水利工程—水力学及河流动力学]