Analytical model for predicting the longitudinal profiles of velocities in a channel with a model vegetation patch
Analytical model for predicting the longitudinal profiles of velocities in a channel with a model vegetation patch
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用于预测具有模型植被斑块的通道中速度纵向剖面的分析模型
DOI：
10.1016/j.jhydrol.2019.06.076
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发表时间：
2019
影响因子：
6.4
通讯作者：
Shan Yuqi
中科院分区：
文献类型：
--
作者：
Liu Chao;Shan Yuqi
本文提出了一个分析模型，用于预测具有刚性圆柱涌现阵列的通道中的深度平均流向速度的纵向分布。从动量方程和流动连续性方程出发，推导了分析模型的控制方程。基于上游和下游两种调流尺度，将带植被片的水槽纵向断面划分为4个区域，并给出了4个区域的解析解。实验室实验表明，阵列长度不会影响阵列上游边缘附近的流量调整，因此该模型可以预测短阵列或长阵列的流向速度纵向剖面。利用20组不同来源的流速数据对模型进行了验证。预测的速度与实测速度一致，表明该模型能够预测的纵向剖面的速度上游和内部的模型补丁。预测的速度分布可以进一步用于估计模型斑块内细沉积物或有机物沉积增强或减少的区域。
This paper proposes an analytical model for predicting the longitudinal profile of depth-averaged streamwise velocities in a channel with an emergent array of rigid cylinders. The governing equation of the analytical model was derived from the momentum equation and flow continuity equation. The longitudinal transect through a flume with a vegetation patch was divided into four regions based on two length scales of flow adjustment upstream of and inside the array, and analytical solutions were proposed for the four regions. Laboratory experiments demonstrated that the array length does not influence flow adjustments near the upstream edge of the array, so the model can predict the longitudinal profile of streamwise velocity for either short or long arrays. Twenty groups of velocity data from different sources were used to verify the proposed model. The predicted velocities agreed well with the measured velocities, indicating that the model is capable of predicting the longitudinal profiles of the velocity upstream of and inside a model patch. The predicted velocity profile can be further employed to estimate regions of enhanced or diminished deposition of fine sediment or organic matter inside model patches.