Numerical simulation of wind sand movement in straw checkerboard barriers

Huang, Ning; Xia, Xianpan; Tong, Ding

doi:10.1140/epje/i2013-13099-6

Cited by 34 publications

(21 citation statements)

References 19 publications

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“…Bo et al () numerically simulated the spatial change in mean wind velocity in the direction of the wind stream above the SCBs without considering particle motion. Huang et al () simulated 2‐D sand movement and analyzed the characteristics of 2‐D wind field, sand mass flux, and sand velocity. All these researches achieved reasonable results.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Turbulent Aeolian Sand Movement Over Straw Checkerboard Barriers and Formation Mechanisms of Their Internal Erosion Form

Zhang

Huang

et al. 2018

JGR Atmospheres

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Straw checkerboard barrier (SCB) array is one of the most effective and widely used measures for antidesertification projects. The efficiency and durability of SCB are greatly influenced by the features of wind field and sand particle motion. Unfortunately, very few studies have explored the characteristics of turbulent flow and the internal erosional form inside the barrier cell, because of the complexity of turbulent flow and the sand particle motion around the surface of SCBs. In this paper, we simulated the wind-sand flow around SCBs using 3-D hybrid Reynolds-averaged Navier-Stokes/large eddy simulation method and Lagrangian particle tracing method to analyze the characteristics of turbulent flow, particle motion, and internal erosional form of SCBs. The results show that the vast majority of particles fall into SCB cells from their middle and posterior parts when wind-sand flow passes SCBs, due to the impact of gravity and subsidence flow. It indicates that SCBs could effectively prevent sand flow-induced hazards. The turbulent flow in SCBs has great instantaneous pulse velocity, resulting in retransfer of sand particles in SCBs. Analysis of the mean flow field in SCB found one huge streamwise vortex that filled the SCB cells and two spanwise vortexes in the back of SCB cells. These vortexes will drive particles inside SCBs to move toward the front and side walls, making the erosional form of SCB cells low in the middle and high near all the sides.Plain Language Summary Straw checkerboard barrier (SCB) is the most representative anti-desertification measure and plays a significant role in anti-desertification projects. We studied the wind-sand flow around SCBs using computational method and analyzed the characteristics of turbulent flow, particle motion and internal erosional form of SCBs. Based on the simulation results, the weakness of current SCBs can be identified. Therefore, this research is of significance in improving artificial sand control measures designed to help combat desertification control.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Turbulent Aeolian Sand Movement Over Straw Checkerboard Barriers and Formation Mechanisms of Their Internal Erosion Form

Zhang

Huang

et al. 2018

JGR Atmospheres

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“…Mechanical measures refer to the method of building sand barriers on the sand surface to achieve the effect of wind and sand fixation. The current studies have mainly evaluated the effectiveness and comprehensive benefits of sand barriers in terms of materials, deployment specifications, and deployment time [59][60][61][62]76] In terms of material types, since sand barriers have a long history of development, there are many types of materials used to make them [77]. According to their sources, they can be divided into natural materials, such as wheat grass, sand willow, and clay, and new artificial materials, such as polylactic acid (PLA) and high-density polyethylene (HDPE).…”

Section: Mechanical Sand Fixation Measuresmentioning

confidence: 99%

Occurrence Regularity of Silt–Clay Minerals in Wind Eroded Deserts of Northwest China

Liu

Sun

et al. 2021

Sustainability

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Wind erosion desertification is the most serious type of land degradation in Northwest China, so it is an important task for ecological management in the region. As the core of ecological management, soil quality is mainly affected by the presence of silt–clay content. Therefore, the grasp of its occurrence regularity is the key to controlling wind erosion desertification. At present, research on silt–clay contents is mainly independent in each local area and lacks integrity, which makes it difficult to meet the overall evaluation and planning requirements. To this end, this paper reviewed the related studies on the occurrence and control of wind erosion desertification in recent years and collected nearly 300 relevant silt–clay content data points. We studied the occurrence regularity of silt–clay content during the occurrence and treatment of wind erosion desertification and revealed the mechanism of silt–clay content in different processes. On this basis, the degree of wind erosion desertification in the major areas of Northwest China in the last five years was evaluated by calculations based on soil typing theory, and the fractal dimension interval (2.41–2.53) for the critical discrimination of desertification in these areas was obtained. The results showed that there were obvious distribution intervals of silt–clay content for different degrees of wind erosion desertification. Qualitative changes in soil quality during degradation ranged from light to moderate wind erosion desertification. The occurrence and control of wind erosion desertification were largely affected by the processes of silt–clay particles loss and aggregation. Among the three main treatment measures, biological measures enhanced silt–clay content most significantly. In this study, the occurrence regularity of silt–clay minerals in wind erosion desertification in Northwest China was revealed as a whole. This study provided a preliminary overall judgement of the dynamic evolution of wind erosion desertification, which provided a reference for the overall evaluation and global governance planning of wind erosion desertification in Northwest China.

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“…Along this highway, a comprehensive sand-control system of straw checkerboard barriers and fences was installed, which can decrease the wind velocity and sand deposition, so as to protect the highway from being buried by the wind-blown sand (Cheng et al, 2015). Huang et al (2013) and Xu et al (2018) also simulated the turbulent flow and the motion of the sand particles over the surface of straw checkerboard barriers. Wind fences, which are used to protect areas from high wind action and sand damage, have been studied to determine the distance of optimum protection, the wind reduction efficiency, and the optimum porosity (Dong et al, 2006(Dong et al, , 2007Li and Douglas, 2015;Zhan et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions

Wang

Lei

et al. 2020

J. Arid Land

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Many desert expressways are affected by the deposition of the wind-blown sand, which might block the movement of vehicles or cause accidents. W-beam central guardrails, which are used to improve the safety of desert expressways, are thought to influence the deposition of the wind-blown sand, but this has yet not to be studied adequately. To address this issue, we conducted a wind tunnel test to simulate and explore how the W-beam central guardrails affect the airflow, the wind-blown sand flux and the deposition of the wind-blown sand on desert expressways in sandy regions. The subgrade model is 3.5 cm high and 80.0 cm wide, with a bank slope ratio of 1:3. The W-beam central guardrails model is 3.7 cm high, which included a 1.4-cm-high W-beam and a 2.3-cm-high stand column. The wind velocity was measured by using pitot-static tubes placed at nine different heights (1, 2, 3, 5, 7, 10, 15, 30 and 50 cm) above the floor of the chamber. The vertical distribution of the wind-blown sand flux in the wind tunnel was measured by using the sand sampler, which was sectioned into 20 intervals. In addition, we measured the wind-blown sand flux in the field at K50 of the Bachu-Shache desert expressway in the Taklimakan Desert on 11 May 2016, by using a customized 78-cm-high gradient sand sampler for the sand flux structure test. Obstruction by the subgrade leads to the formation of two weak wind zones located at the foot of the windward slope and at the leeward slope of the subgrade, and the wind velocity on the leeward side weakens significantly. The W-beam central guardrails decrease the leeward wind velocity, whereas the velocity increases through the bottom gaps and over the top of the W-beam central guardrails. The vertical distribution of the wind-blown sand flux measured by wind tunnel follows neither a power-law nor an exponential function when affected by either the subgrade or the W-beam central guardrails. At 0.0H and 0.5H (where H=3.5 cm, which is the height of the subgrade), the sand transport is less at the 3 cm height from the subgrade surface than at the 1 and 5 cm heights as a result of obstruction by the W-beam central guardrails, and the maximum sand transportation occurs at the 5 cm height affected by the subgrade surface. The average saltation height in the presence of the W-beam central guardrails is greater than the subgrade height. The field test shows that the sand deposits on the overtaking lane leeward of the W-beam central guardrails and that the thickness of the deposited sand is determined by the difference in the sand mass transported between the inlet and outlet points, which is consistent with the position of the minimum wind velocity in the wind tunnel test. The results of this study could help us to understand the hazards of the wind-blown sand onto subgrade with the W-beam central guardrails.

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Numerical simulation of wind sand movement in straw checkerboard barriers

Cited by 34 publications

References 19 publications

Characteristics of Turbulent Aeolian Sand Movement Over Straw Checkerboard Barriers and Formation Mechanisms of Their Internal Erosion Form

Characteristics of Turbulent Aeolian Sand Movement Over Straw Checkerboard Barriers and Formation Mechanisms of Their Internal Erosion Form

Occurrence Regularity of Silt–Clay Minerals in Wind Eroded Deserts of Northwest China

Effect of the W-beam central guardrails on wind-blown sand deposition on desert expressways in sandy regions

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