The relationship between flow depth and hydraulic parameters for high surface roughness of vegetation stem cover under laboratory simulation

IF 3.7 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

International Journal of Sediment Research Pub Date : 2025-10-01 DOI:10.1016/j.ijsrc.2025.06.004

Hongli Mu , Yifan Zhuo , Yanjuan Wu , Suhua Fu , Kai Zhang , Sangar Khan , Naicheng Wu

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引用次数: 0

Abstract

Grass, shrubs and tree stems can increase flow depth and resistance and prevent soil erosion, and it is necessary to quantify the relationship between flow depth and hydraulic parameters for high surface roughness of vegetation stem. Therefore, the experimental design included flow depth, velocity and transport capacity, which were measured for different stem covers (bare flume to cover 30%), diameters (2, 10, and 36 mm), and arrangements (bead, tessellation, stagger, random, and stripe) to clarify the relationship between flow depth and the hydraulic radius, Reynolds number Re, Manning coefficient n_m, Darcy-Weisbach resistance f and transport capacity Tc. The result shows that flow depth could be effectively predicted by stem cover and stem diameter; the greater the surface roughness was, the more the difference between flow depth and hydraulic radius; and flow depth could not be used as the hydraulic radius to calculate hydraulic parameters for high surface roughness. Re, n_m, and f were significantly impacted by flow depth. The linear relationship between flow depth and Re, n_m, and f became stronger as stem cover decreased and stem diameter increased, and they were more affected by stem cover than by diameter. The relationship between flow depth and f was less impacted by high surface roughness of vegetation stem. Tc was not significantly impacted by flow depth; the Manning coefficient and Darcy-Weisbach resistance were not appropriate for predicting transport capacity; and the Reynolds number could illustrate the mechanism of sediment transport capacity affected by vegetation stem cover from the perspective of flow resistance.

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室内模拟植被茎盖高表面粗糙度流深与水力参数的关系

草、灌木、乔木茎可以增加水流深度和阻力，防止土壤侵蚀，植被茎表面粗糙度高，有必要量化水流深度与水力参数的关系。因此，实验设计包括流深、流速和输运能力，分别对不同的干盖（裸水槽覆盖30%）、直径（2、10和36 mm）和布置（头形、嵌格、交错、随机和条形）进行测量，以阐明流深与水力半径、雷诺数Re、曼宁系数nm、达西-韦斯巴赫阻力f和输运能力Tc的关系。结果表明：阀盖和阀杆直径可以有效地预测流深；表面粗糙度越大，流动深度与水力半径之差越大；在高表面粗糙度条件下，不能用流深作为水力半径计算水力参数。Re、nm和f受流动深度影响显著。随着阀盖的减小和阀径的增大，流深与Re、nm、f之间的线性关系越强，且阀盖对它们的影响大于阀径。流深与f的关系受植被茎秆表面粗糙度的影响较小。流动深度对Tc的影响不显著；Manning系数和Darcy-Weisbach阻力不适合预测运输能力；雷诺数可以从流阻的角度说明植被覆盖对输沙能力的影响机制。

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

International Journal of Sediment Research 环境科学-环境科学

CiteScore

6.90

自引率

5.60%

发文量

审稿时长

74 days

期刊介绍： International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.