基于掺长模型非淹没刚性植被水流流速垂向分布的数值解
Numerical Solution for Vertical Profile of Velocity in Flow Through Emergent Rigid Vegetation Based on Mixing Length Model
作者：槐文信(武汉大学 水资源与水电工程科学国家重点实验室，湖北 武汉，430072)；赵磊(武汉大学 水资源与水电工程科学国家重点实验室，湖北 武汉，430072)；杨中华(武汉大学 水资源与水电工程科学国家重点实验室，湖北 武汉，430072)
Author：(State Key Lab. of Water Resources and Hydropower Eng. Sci., Wuhan Univ., Wuhan 430072, China)；(State Key Lab. of Water Resources and Hydropower Eng. Sci., Wuhan Univ., Wuhan 430072, China)；(State Key Lab. of Water Resources and Hydropower Eng. Sci., Wuhan Univ., Wuhan 430072, China)
收稿日期：2007-10-26 年卷（期）页码：2009,41(2):12-17
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：流速垂向分布;非淹没植被;混掺长度;摩阻流速
Key words：vertical velocity distributions;emergent vegetation;the mixing length;friction velocity
基金项目：国家自然科学基金资助项目(50679061)
中文摘要
对非淹没刚性植被的水流流速垂向分布进行了研究，基于恒定均匀流假定，通过单元体的受力分析得到考虑刚性、非淹没植被作用后水体单元流动的控制方程，充分考虑了植被群对混掺长度、植被拖曳力系数、达西—魏斯巴哈摩擦系数的影响，得到了基于混合长度概念的求解非淹没刚性植被水流流速垂向分布的新模型。该模型物理概念清晰，形式简单，可直接计算出摩阻流速。结合本文和Rowinski 等的室内水槽实验资料，采用该模型对非淹没刚性植被流速垂向分布进行了数值模拟，结果表明本文给出新的掺长模型是合理有效的。
英文摘要
This paper is the study on velocities of the flow in straight channel with emergent, rigid vegetation. The flow is assumed to be steady and uniform. The vertical profiles of stream wise velocities are simulated using a new model which is based on the mixing length concept, given by analyzing the relevant forces acting on the volumetric element surrounding the considered vegetation elements. This model fully takes into account the vegetation group’s influences on the mixing length，drag coefficient and Darcy Weisbach friction factor. Great advantage of the model are that the physical concept is clear，the form is simple, and the friction velocity can be evaluated directly. The numerical simulations have been tested against the data obtained experimentally by this paper and Rowinski respectively with emergent，rigid vegetation. The results indicate the new mixing length model in this paper is effective and reasonable.
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