Overland flow resistance: A review

IF 10.8 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Earth-Science Reviews Pub Date : 2024-10-03 DOI:10.1016/j.earscirev.2024.104949

Alessio Nicosia , Francesco Giuseppe Carollo , Costanza Di Stefano , Vincenzo Palmeri , Vincenzo Pampalone , Vito Ferro

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Abstract

Shallow water flows over rough natural hillslopes contribute to interrill erosion and floods. The friction factor, that describes the hydraulic resistance, is particularly important for modeling soil erosion and transport processes. The present review focuses on the Darcy-Weisbach friction factor f for both large and small-scale roughness conditions and addresses the effects of rainfall intensity, vegetation cover, and sediment transport on overland flow resistance. All the studies on rainfall effect agree regarding the increase of the friction factor with rainfall intensity for the laminar flow regime and their independence for flows characterized by Reynolds number higher than a threshold varying between 800 and 2000. The analysis of the literature allows for concluding that f always increases with vegetation cover. Moreover, f (or its component due to sediment transport) increases with sediment concentration, slope, and Reynolds number, while it decreases with increasing values of Froude number and dimensionless sediment diameter. Finally, the focus areas for future research are highlighted.

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陆上流动阻力：综述

浅水流经粗糙的自然山坡会造成山间侵蚀和洪水。描述水力阻力的摩擦因数对于土壤侵蚀和迁移过程的建模尤为重要。本综述侧重于大尺度和小尺度粗糙度条件下的达西-韦斯巴赫摩擦因数 f，并探讨了降雨强度、植被覆盖和泥沙输移对陆上流动阻力的影响。所有关于降雨影响的研究都一致认为，在层流状态下，摩擦因数随降雨强度的增加而增加，而在雷诺数大于 800 到 2000 之间的临界值时，摩擦因数则独立存在。通过对文献的分析可以得出结论，摩擦因数总是随植被覆盖度的增加而增加。此外，f（或其因沉积物迁移而产生的部分）随沉积物浓度、坡度和雷诺数的增加而增大，而随弗劳德数和无量纲沉积物直径值的增加而减小。最后，强调了未来研究的重点领域。

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

Earth-Science Reviews 地学-地球科学综合

CiteScore

21.70

自引率

5.80%

发文量

294

审稿时长

15.1 weeks

期刊介绍： Covering a much wider field than the usual specialist journals, Earth Science Reviews publishes review articles dealing with all aspects of Earth Sciences, and is an important vehicle for allowing readers to see their particular interest related to the Earth Sciences as a whole.