Drag coefficients and water surface profiles in channels with arrays of linear rigid emergent vegetation

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2024-10-02 DOI:10.1016/j.jher.2024.10.001
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Abstract

Although vegetation in watercourses has an important ecological function, from a hydraulic point of view, it increases flow resistance, determinates higher water levels and generates a greater risk of flooding. In engineering practice, to determine water levels, the drag coefficient must be known, whose experimental values, in literature, are provided for uniform or quasi-uniform flow. In this paper, the expression of a drag coefficient, previously proposed by the authors for the case of emergent rigid vegetation arranged in a linear manner, was used to simulate experimental water surface profiles, employing the effective width for the first time. The formula was validated by simulating 26 experimental profiles observed at the University of Calabria, over 1100 points in total, plus 8 published in literature. In some of these applications, the vegetation density was much higher than that for which the drag coefficient expression was derived. For this reason, it is possible to consider a new, wider field of validity for it. The proposed equation is independent of the Reynolds stem number, so that it can be used in natural streams and rivers, provided that viscosity effects can be considered negligible. Finally, some comments are offered on the application of a new formula proposed in literature regarding the computation of the profile when downstream depth is taken as a boundary condition.
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带有线性刚性挺水植被阵列的渠道中的阻力系数和水面剖面
虽然河道中的植被具有重要的生态功能,但从水力角度来看,植被会增加水流阻力,决定水位的高低,造成更大的洪水风险。在工程实践中,要确定水位,必须知道阻力系数,文献中提供了均匀或准均匀流的实验值。在本文中,作者之前针对以线性方式排列的新兴刚性植被提出的阻力系数表达式被用于模拟实验水面剖面,并首次采用了有效宽度。通过模拟卡拉布里亚大学观测到的 26 个实验剖面(共 1100 多个点)以及文献中发表的 8 个点,对该公式进行了验证。在其中一些应用中,植被密度远高于得出阻力系数表达式的植被密度。因此,有可能为其考虑一个新的、更广泛的有效领域。所提出的方程与雷诺干系数无关,因此可用于天然溪流和河流,前提是粘度效应可以忽略不计。最后,本文还对文献中提出的一个新公式的应用提出了一些意见,该公式适用于将下游深度作为边界条件时的剖面计算。
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
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
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.
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