植物条件下明渠紊流KH涡相关问题研究进展  

Advances in related issues on KH vortex in vegetated open channel flows

作　　者：闫静[1] 刘杰夫 陈红[1] 王晓丽 YAN Jing;LIU Jiefu;CHEN Hong;WANG Xiaoli(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电科技进展》2020年第2期90-94,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51979084,51579079,51109066)。

摘　　要：植物是生态功能完备的河流的重要特征,淹没植物条件下产生的特殊紊流拟序结构——KH涡,对水-沙-污染物运动具有直接影响。从KH涡的发现、形成条件、特征参数(形态特征参数和运动周期)三方面,回顾了国内外植物条件下明渠紊流KH涡相关问题的研究进展,总结了植物密度和淹没度对KH涡的影响规律,提出结合紊流不稳定性理论、紊流拟序结构分析方法、流动显示、图像技术来研究KH涡的形成条件(临界密度或临界淹没度)、沿程发展过程、影响因素(如植物密度、刚度、几何形态、淹没度、水流强度)的具体影响,是下一步需要探索的关键。Vegetation is an important feature of a fully functioning river ecosystem.The KH vortex,a special coherent structure generated in submerged vegetated flows,has direct influence on the flow-sediment-contaminant transport.Advances in related issues on KH vortex in vegetated turbulent flows were reviewed from the aspects of the discovery,the formation conditions,the parameter characteristics of the geometrical form and the period of KH vortices.The main effects of vegetation density and submergence on KH vortices were summarized.It is suggested that the key issues to be further explored should be focused on the critical conditions for the KH vortex formation such as the critical density or the submergence,the development progress along the streamwise direction and the specific influence of the factors(such as density,rigidity and geometry of vegetation,submergence and flow intensity)by coupling the turbulence instability theory,spectrum analysis,flow visualization and image technique.

关 键 词：植物 明渠紊流 KH涡 研究进展 

分 类 号：TV143[水利工程—水力学及河流动力学]