Numerical study on the effect of semi-buried straw checkerboard sand barriers belt on the wind speed

Bo, Tang; Ma, Peng; Zheng, Xiaojing

doi:10.1016/j.aeolia.2014.10.002

Cited by 34 publications

(25 citation statements)

References 22 publications

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“…Zhu et al () proposed an arc sand model based on the assumption that the tangent‐chord angle of the arc at the highest point is equal to the angle of repose of a dry sand dune and obtained the approximate functional relationship between the side length of the SCB cells and the maximum depth of wind erosion in it. 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.…”

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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“…The resultant reduction in transport helps stabilize surfaces. A stable concave sand surface typically forms in gaps between wheat straw grid lines demonstrating air flow over the surface without deposition or major erosion (Zhang et al 2011;Bo et al 2015). In summary, these barriers effectively limit wind erosion and aeolian deposition.…”

Section: Protective Effects Of Oasis Protective Systemmentioning

confidence: 99%

Effects of an oasis protective system on aeolian sediment deposition: a case study from Gelintan oasis, southeastern edge of the Tengger Desert, China

Ding¹,

Xie

et al. 2020

J. Mt. Sci.

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Desert-oasis ecotones are boundary areas between oases and desert ecosystems. Large efforts to control sediment and stabilize these boundaries depend on understanding sedimentary processes, especially aeolian transport and deposition. Previous studies on aeolian sediment deposition have focused primarily on a single land surface type or a single engineering approach. Few studies have considered deposition in a multi-layer oasis protective system. A complete oasis protective system consists of an outer bare sand area, a sand barrier zone, a shrub and herbaceous plant zone, and a farmland shelter zone. This study used sedimentary analysis to quantify grain-size characteristics in samples from the four land surfaces under different types of weather conditions in the Gelintan oasis of the Tengger Desert, the fourth largest desert in China. The results showed that aeolian sediment deposition decreased from the outer bare sand area through the oasis protective system and into the interior. The four land surface types showed significant differences in deposition volume (P < 0.05). Deposited sediment showed gradual decrease in dominant grain-size from sand to

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“…Since the FVC and LAI respectively parameterize the horizontal and vertical density of vegetation [31], and NPP is the rate of net accumulation of organic matter in plants [76], with the growth of vegetation, they increase simultaneously in general. Vegetation generally reduces runoff and soil water erosion and thus enhances soil retention by intercepting rainfall, increasing water infiltration, increasing soil shear strength, reducing raindrop energy and 'splash' effects, and trapping sediment where rainfall is abundant [77][78][79], and halts near-surface sand flow, hence improving sand fixation by stabilizing soil, increasing underlying surface roughness, reducing near-surface wind speed, and weakening sand transportation intensity in arid and semi-arid regions [80][81][82].…”

Section: Trade-offs and Synergies Of Ecological Indicators In Ggp Areamentioning

confidence: 99%

Did Ecological Restoration Hit Its Mark? Monitoring and Assessing Ecological Changes in the Grain for Green Program Region Using Multi-source Satellite Images

et al. 2019

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Ecological restoration programs are expected to control environmental deterioration and enhance ecosystem functions under a scenario of increasing human disturbance. The largest ecological restoration program ever implemented in China, the first round of the countrywide Grain for Green Program (GGP), finished in 2010. However, it is not known whether the ecological changes that resulted from the GGP met the restoration goal across the whole implementation region. In this study, we monitored and assessed the ecological changes in the whole GGP region in China over the lifetime of the first round of implementation (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010), by establishing a comprehensive assessment indicator system composed of ecosystem pattern, ecosystem quality (EQ), and key ecosystem services (ESs). Remote sensing interpretation, ecological model simulations based on multi-source images, and trend analysis were used to generate land use and land cover (LULC) datasets and estimate ES and ESs indicators. Results showed that while forest increased by 0.77%, artificial land increased more intensely by 22.38%, and cropland and grassland decreased by 1.81% and 0.68%, respectively. The interconversion of cropland and forest played a primary role in ecosystem pattern change. The increase in ecosystem quality measures, including fractional vegetation cover (0.1459% yr −1 ), leaf area index (0.0121 yr −1 ), and net primary productivity (2.6958 gC m −2 yr −1 ), and the mitigation of ecosystem services deterioration in soil water loss (−0.0841 t ha yr −1 ) and soil wind loss (−1.0071 t ha yr −1 ) in the GGP region, indicated the positive ecological change in the GGP region to some extent, while southern GGP subregions improved more than the those in the north on the whole. The GGP implementation other than climate change impacted ecological change, with contributions of 14.23%, 9.94%, 8.23%, 30.45%, and 18.05% in the ecological outputs mentioned above, respectively. However, the water regulation did not improve (−2283 t km −2 yr −1 ), revealing trade-offs between ecosystem services and inappropriate afforestation in ecological restoration programs. Future GGP implementation should change the practice of large-scale afforestation, and focus more on the restoration of existing forest and cultivation of young plantings, formulating rational and specific plans and designs for afforestation areas through the establishment of near-natural vegetation communities, instead of single-species plantations, guided by regional climate and geographical characteristics.

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Numerical study on the effect of semi-buried straw checkerboard sand barriers belt on the wind speed

Cited by 34 publications

References 22 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

Effects of an oasis protective system on aeolian sediment deposition: a case study from Gelintan oasis, southeastern edge of the Tengger Desert, China

Did Ecological Restoration Hit Its Mark? Monitoring and Assessing Ecological Changes in the Grain for Green Program Region Using Multi-source Satellite Images

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