Effect of the gravel-vegetation combination on shear-stress partitioning and sand transport rate

IF 3.1 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research Pub Date : 2025-03-24 DOI:10.1016/j.aeolia.2025.100973

Liqiang Kang, Xiaomei Wang, Xueyong Zou, Zhicheng Yang

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Abstract

The existing research mainly focuses on the influence of a single type of roughness element on shear-stress partitioning and sediment transport. However, when the two types of roughness elements (such as gravel and vegetation) coexist, the laws of shear-stress partitioning and sediment transport are still unclear. Two different types of roughness elements are selected (one is the cylindrical gravel model, and the other is the flexible plant model). The distribution of surface shear stress, total shear stress and sand transport rate on different gravel-vegetation surfaces were measured in a wind tunnel. The results show that the shear-stress partitioning on gravel-vegetation surfaces is expressed as a function of the gravel lateral cover and the plant lateral cover, and the model parameters can be approximately characterized by the model parameters of gravel-only surface and vegetation-only surface. The sand transport rate on gravel-vegetation surface is related to the probability density function of surface shear stress which is expressed as a normal distribution function. For gravel lateral cover greater than 0.025, the parameter C in the model of sand transport rate decreases linearly with increasing gravel lateral cover and increases linearly with increasing plant frontal area, but is not influenced by plant lateral cover. The non-dimensional sand transport rate of gravel-vegetation surface decays exponentially with total lateral cover, and its decay rate is smaller than that of gravel-only surface, but larger than that of vegetation-only surface. The present research is helpful to improve wind erosion model in the future.

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砾石-植被组合对剪切应力分配和输沙速率的影响

现有的研究主要集中在单一类型的粗糙度元素对剪切应力分配和输沙的影响。然而，当两种粗糙度元素（如砾石和植被）共存时，剪切应力分配和输沙规律尚不清楚。选择了两种不同类型的粗糙度单元（一种是圆柱形砾石模型，另一种是柔性植物模型）。在风洞中测量了不同砾石-植被表面剪应力、总剪应力和输沙率的分布。结果表明：砾石-植被表面的剪应力分区是砾石侧盖层和植物侧盖层的函数，模型参数可以近似表征为纯砾石面和纯植被面的模型参数。砾石-植被表面输沙率与地表剪应力的概率密度函数有关，剪应力的概率密度函数表示为正态分布函数。当砾石侧盖度大于0.025时，输沙率模型中的参数C随砾石侧盖度的增加而线性减小，随植物前缘面积的增加而线性增大，但不受植物侧盖度的影响。砾石-植被地表的无因次输沙率随总侧盖度呈指数衰减，其衰减率小于纯砾石地表，但大于纯植被地表。本文的研究有助于今后风蚀模型的完善。

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来源期刊

Aeolian Research GEOGRAPHY, PHYSICAL-

CiteScore

7.10

自引率

6.10%

发文量

审稿时长

>12 weeks

期刊介绍： The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.