回字形固沙体系固沙效应的风洞模拟试验

doi:10.13866/j.azr.2025.09.09

Abstract

Abstract:

This study proposes an innovative sand-checkerboard barrier system based on optimized, stead-state dimensions (height-to-length ratio=0.1-0.2), constructed using locally sourced sand to create barriers with a height and length of 20 cm and 100 cm, respectively. Although these sand checkerboards are efficient and cost-effective to construct, they are susceptible to aeolian erosion. To overcome this limitation, we developed a nested-square protection system that integrates sand checkerboards with peripheral barriers made of fiber netting or brush straw checkerboards. Through wind tunnel simulations, we systematically evaluated three configurations: standalone sand checkerboards, fiber-net+sand-checkerboard combinations, and brush-straw-checkerboard+sand-checkerboard composites. The quantitative analyses included sediment flux density profiles, surface erosion/deposition patterns, and functional modeling of height-dependent sand transport. The main findings of this study are summarized as follows. (1) Standalone sand checkerboards effectively reduce sediment flux density within 0-10 cm height but increase transport at higher levels. (2) Front flexible barriers significantly attenuate aeolian kinetic energy, with brush straw checkerboards outperforming fiber nets in transport reduction (84.6%>80.6%). (3) Front barriers effectively maintain barrier integrity at 10 m·s^-1, whereas brush straw checkerboard demonstrates superior protection under extreme winds than the fiber net counterpart (The height of sand-checkerboard decreased by 2-8 cm vs. 3-9 cm). (4) Synergistic interactions in the composite systems enhance overall sediment retention and extend service life compared to the standalone configurations. The superior performance of the brush straw checkerboard barriers is attributed to their three-dimensional structure, which creates turbulent microzones for enhanced energy dissipation and their lower comprehensive cost. Moreover, this study offers a scientifically grounded framework for optimizing the barrier design, promoting “local-material utilization” and “sand-combatting-sand” strategies in the desertification control. The proposed nested-square system offers a scalable solution that balances ecological sustainability with engineering effectiveness for arid land management.

Key words: nested-square sand-fixing system, sand-checkerboard barrier, fiber net barrier, brush straw checkerboard barrier, wind tunnel simulation test

QU Jianjun, ZHU Zhihao, SHEN Baoshou, GAO Yongping, LI Hong. Wind tunnel simulation test on sand-fixing effect of the nested-square sand-fixing system[J].Arid Zone Research, 2025, 42(9): 1650-1659.

Figures/Tables 11

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References 32

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沙障类型	风速/（m·s^-1）	a	b	c	R²	P
无沙障	10	0.002	2.156	2.512	0.990	<0.001
	14	0.064	14.941	2.979	0.992	<0.001
	18	0.077	26.582	5.085	0.991	<0.001
沙方格沙障	10	0.006	0.407	7.359	0.960	<0.001
	14	-0.065	2.059	16.503	0.983	<0.001
	18	-1.156	6.723	29.010	0.959	<0.001
纤维网沙障+沙方格沙障	10	0.002	0.078	5.762	0.924	<0.001
	14	0.007	0.758	9.357	0.957	<0.001
	18	-0.184	2.782	18.425	0.983	<0.001
刷状草方格沙障+沙方格沙障	10	0.000	0.056	9.291	0.952	<0.001
	14	-0.009	0.369	15.561	0.976	<0.001
	18	-0.168	1.921	22.872	0.983	<0.001

沙障类型	风速/（m·s^-1）			平均
沙障类型	10	14	18	平均
沙方格沙障	29.6%	31.7%	22.7%	28.0%
纤维网沙障+沙方格沙障	88.2%	82.7%	70.9%	80.6%
刷状草方格沙障+沙方格沙障	89.2%	88.1%	76.5%	84.6%

沙障类型	风速/（m·s^-1）
沙障类型	10	14	18
沙方格沙障	18~19 cm	15~16 cm	10~12 cm
纤维网沙障+沙方格沙障	20 cm	15~17 cm	11~15 cm
刷状草方格沙障+沙方格沙障	20 cm	15~18 cm	12~15 cm

Wind tunnel simulation test on sand-fixing effect of the nested-square sand-fixing system

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