On deducing the drag coefficient formula of cylindrical vegetation in non-uniform channel flow

IF 2.4 3区环境科学与生态学 Q2 ENGINEERING, CIVIL

Journal of Hydro-environment Research Pub Date : 2023-09-01 DOI:10.1016/j.jher.2023.07.003

Ji-Kun Han , Wei-Jie Wang , Fei Dong , Jin-Yong Zhao , Wen-Qi Peng , Zhou-Bing Zhu , Fang Zhao , Biao Liu

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引用次数: 0

Abstract

Research on water flow resistance characteristics in a vegetation environment is a hotspot in environmental fluid research, which is primarily concentrated on the calculation of the vegetation drag coefficient C_d. At present, relatively few studies exist on the resistance characteristics of vegetation under non-uniform flow conditions, resulting in few general expressions for the research of C_d for this type of condition. In response to these scientific problems, this study selects shrub vegetation as the research object and generalised it as cylinders for the simulation study. This study adopts quadratic and Gaussian functions to change the coordinate expression of cylindrical vegetation C_d and then proposes the drag formulas of cylindrical vegetation in non-uniform flow for non-rainfall and heavy rainfall conditions based on regression analysis. Finally, this study substitutes the proposed C_d formula into the Saint-Venant equation to calculate the depth of channel flow. The newly proposed equations are verified by comparing the measured flow depth data with the calculation results. This study provides technical support for refined hydrodynamic simulations of vegetated flow regions.

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非均匀通道流中圆柱形植被阻力系数公式的推导

植被环境中的水流阻力特性研究是环境流体研究的热点，主要集中在植被阻力系数Cd的计算上。目前，关于非均匀流动条件下植被的阻力特性的研究相对较少，导致对于这种类型的条件，很少有研究Cd的一般表达式。针对这些科学问题，本研究选择灌木植被作为研究对象，并将其概括为圆柱体进行模拟研究。本研究采用二次函数和高斯函数来改变圆柱形植被Cd的坐标表达式，然后基于回归分析提出了非降雨和强降雨条件下圆柱形植被在非均匀流中的阻力公式。最后，本研究将所提出的Cd公式代入Saint-Venant方程来计算河道水流深度。通过将实测流深数据与计算结果进行比较，验证了新提出的方程组。这项研究为植被流动区域的精细水动力学模拟提供了技术支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES

CiteScore

5.80

自引率

0.00%

发文量

审稿时长

98 days

期刊介绍： The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.