Two dimensional analytical solution for a partially vegetated compound channel flow
Two dimensional analytical solution for a partially vegetated compound channel flow
复制标题
部分植被复合河道流的二维解析解
DOI：
10.1007/s10483-008-0811-y
复制
发表时间：
2008-08-01
影响因子：
4.4
通讯作者：
Zeng Yu-hong
中科院分区：
文献类型：
--
作者：
Huai Wen-xin;Xu Zhi-gang;Zeng Yu-hong
应用涡流黏度模型理论，对部分植被覆盖的复合通道内的流动进行了研究。控制方程是通过分析作用在单位体积上的纵向力而建立的，其中植被对水流的影响作为阻力项考虑。在横向上将复合通道划分为3个子区域，同时求解每个区域的微分方程系数。从而得到了部分植被复合通道内均匀流动深度平均流速横向分布的解析解。研究结果可用于预测河床剪应力的横向分布，剪应力对沉积物的输运有重要影响。通过分析结果与实测数据的比较，表明本文的解析解具有足够的精度，可以预测工程设计中大部分的水力特征。
The theory of an eddy viscosity model is applied to the study of the flow in a compound channel which is partially vegetated. The governing equation is constituted by analyzing the longitudinal forces acting on the unit volume where the effect of the vegetation on the flow is considered as a drag force item. The compound channel is divided into 3 sub-regions in the transverse direction, and the coefficients in every region’s differential equations were solved simultaneously. Thus, the analytical solution of the transverse distribution of the depth-averaged velocity for uniform flow in a partially vegetated compound channel was obtained. The results can be used to predict the transverse distribution of bed shear stress, which has an important effect on the transportation of sediment. By comparing the analytical results with the measured data, the analytical solution in this paper is shown to be sufficiently accurate to predict most hydraulic features for engineering design purposes.