基于掺长理论的淹没柔性植被水流流速分布研究

槐文信; 韩杰; 曾玉红; 安翔; 钱忠东

基于掺长理论的淹没柔性植被水流流速分布研究

水资源与水电工程科学国家重点实验室,武汉大学,武汉 430072

基金项目: 国家自然科学基金资助项目(506790615070902550749031)

详细信息

作者简介:
槐文信(1963- ),男,陕西乾县人,教授,博士生导师(联系人.Tel:+86-27-68772211;E-mail:wxhuai@whu.edu.cn).

中图分类号: TV133.1
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- 文章访问数: 4220
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出版历程
- 收稿日期: 2008-09-03
- 修回日期: 2008-11-21
- 刊出日期: 2009-03-15

Study on Velocity Distribution of Flow With Submerged Flexible Vegetations Based on Mixing-Length Approach

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, P. R. China

摘要

摘要: 采用PVC薄片对柔性植被进行了模拟，并用三维Micro ADV对淹没柔性植被恒定水流进行了实验测量，获得了水流纵向流速和Reynolds切应力的分布．实验结果表明，淹没柔性植被水流植被层和非植被层的水力特性有显著不同．在非植被层，Reynolds应力为直线分布，而时均流速则符合经典的对数律分布．基于新“河床”的概念，首次提出用河道压缩参数来表示植被对水流的影响，并合理假设了一个新的混合长度公式，由此得到的时均流速公式相比前人的成果有所需参数少、计算简单及实用性强等优点．
- 柔性植被 /
- PVC薄片 /
- Micro ADV（多普勒超声测速仪） /
- 混合长度 /
- 主流流速分布 /
- Reynolds应力 /
- 河道压缩参数
Abstract: Choosing PVC slice to simulate the flexible vegetation, the laboratory experiments were carried out in an open channel with submerged flexible vegetation, and 3D acoustic Doppler velocimeter (Micro ADV) was introduced to measure the local flow velocities and Reynolds stress. The result showed that the hydraulic characteristics in the non-vegetation layer and the vegetation layer are totally different. In the region above the vegetation, Reynolds stress's distribution is linear; meanwhile, measured velocity's profile is a classical logarithmic one. Based on the concept of nwe/riverbed0, the river compress parameter which represented the impact of vegetation on river was given for the first time and a new mixing length expression was assumed with reason. The formula of time-averaged velocity deduced from the mixing length expression had advantages of less parameters needed, simple calculation and useful application.
- flexible vegetation /
- PVC slice /
- Micro ADV /
- mixing-length approach /
- stream-wise velocity distribution /
- Reynolds stress /
- river compressed parameter

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参考文献(25)

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基于掺长理论的淹没柔性植被水流流速分布研究

作者简介:
槐文信(1963- ),男,陕西乾县人,教授,博士生导师(联系人.Tel:+86-27-68772211;E-mail:wxhuai@whu.edu.cn).

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Study on Velocity Distribution of Flow With Submerged Flexible Vegetations Based on Mixing-Length Approach

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留言板

基于掺长理论的淹没柔性植被水流流速分布研究

作者简介: 槐文信(1963- ),男,陕西乾县人,教授,博士生导师(联系人.Tel:+86-27-68772211;E-mail:wxhuai@whu.edu.cn).

计量

出版历程

Study on Velocity Distribution of Flow With Submerged Flexible Vegetations Based on Mixing-Length Approach

计量

出版历程

目录

作者简介:
槐文信(1963- ),男,陕西乾县人,教授,博士生导师(联系人.Tel:+86-27-68772211;E-mail:wxhuai@whu.edu.cn).