| 灌木植被水流的流速垂向分布 |
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| 引用本文： | 刘昭伟,陈永灿,朱德军,惠二青,江春波.灌木植被水流的流速垂向分布[J].水力发电学报,2011,30(6). |
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| 作者姓名： | 刘昭伟 陈永灿 朱德军 惠二青 江春波 |
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| 作者单位： | 1. 清华大学水沙科学及水利水电工程国家重点实验室,北京,100084
2. 长江三峡集团公司科技环保部,宜昌,443002 |
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| 基金项目： | 国家自然科学基金(51039002,50823005,50809034); 水沙科学与水利水电工程国家重点实验室资助项目(2009-TC-2) |
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| 摘 要： | 速度分布是植被水流动力学研究的基础问题之一。与明槽水流的对数流速分布不同,植被水流在垂直方向差别较大,一般分为植间水流和植上水流两部分,垂向分布较为复杂。本文在考虑水流动量平衡的基础上,借助于混合长度紊流模型,并考虑植被形态的垂向差异,建立了表征流速垂向分布的微分方程;以灌木植被的形状为原型,在假定灌木直径垂向分布的前提下,得到了更为普适的流速垂向分布公式。将所得到的解析公式和室内试验数据及Baptist公式进行对比分析,发现本文公式与试验数据吻合得更好,能准确地反映植间流速的垂向变化。
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| 关 键 词： | 环境水力学 植被水流 流速 垂向分布 灌木 |
Vertical profile of horizontal velocity of flow through shrubs |
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| LIU Zhaowei,CHEN Yongcan,ZHU Dejun,HUI Erqing,JIANG Chunbo.Vertical profile of horizontal velocity of flow through shrubs[J].Journal of Hydroelectric Engineering,2011,30(6). |
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| Authors: | LIU Zhaowei CHEN Yongcan ZHU Dejun HUI Erqing JIANG Chunbo |
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| Affiliation: | LIU Zhaowei1,CHEN Yongcan1,ZHU Dejun1,HUI Erqing2,JIANG Chunbo1(1.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,2.Department of Science&technoloty and Environment Protection,China Three Gorges Corporation,Yichang Hubei 443002) |
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| Abstract: | This paper presents an analytical solution of vertical profile of horizontal velocity for vegetated open channel flow.Owing to vegetation effects,the vertical profile is often complicated and difficult to express analytically.To simplify the analysis,the flow is divided vertically into two layers,a vegetable-occupied bottom layer and a layer over it.Then a differential equation for horizontal velocity can be established by using the momentum theorem and mixing-length turbulence model and considering the dif... |
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| Keywords: | eviromental hydraulics vegetated channel flow velocity vertical profile shrubs |
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