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[1] 赵磊[1] 杨中华[1] 李丹[1] 

机构地区：[1]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

出　　处：《四川大学学报（工程科学版）》2009年第2期12-17,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50679061)

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。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-Weisb...

关 键 词：流速垂向分布 非淹没植被 混掺长度 摩阻流速 

分 类 号：TV133[水利工程—水力学及河流动力学]