Wind tunnel test on windbreak and sand-fixing effect of double-layer net shield sand barrier

doi:10.7522/j.issn.1000-694X.2025.00114

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (3): 141-151.DOI: 10.7522/j.issn.1000-694X.2025.00114

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Wind tunnel test on windbreak and sand-fixing effect of double-layer net shield sand barrier

Jianjun Qu¹^,²(), Zhihao Zhu¹^,²(), Qihang Li¹, Yongping Gao³, Ting Lin¹^,⁴

^1.Guangdong Provincial Laboratory of Southern Marine Science and Engineering，Guangzhou 511458，China
^2.College of Urban and Environmental Sciences，Northwest University，Xi'an 710127，China
^3.Shapotou Desert Research and Experiment Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^4.School of Geography and Remote Sensing，Guangzhou University，Guangzhou 510006，China

Received:2025-02-18 Revised:2025-05-09 Online:2025-05-20 Published:2025-06-30
Contact: Zhihao Zhu

Abstract

Abstract:

The double-layer net shield sand barrier had high sand-blocking and sand-fixing benefits. Wind tunnel simulation tests were carried out on single-layer and double-layer net shield sand barriers with different apertures to compare their flow field characteristics， wind-sand flow structure and state of erosion and deposition. The results showed that：（1） A significant deceleration zone （0~44 cm） was formed inside the net shield sand barrier， and a stronger deceleration zone （44~130 cm） was generated at the rear end. Among them， the double-layer sand barrier with an aperture of 2 mm had the most significant deceleration effect. Compared with the single-layer sand barrier， it can form a larger deceleration area， and showed good adaptability under different wind velocity conditions. （2） The distribution of sediment discharge in the net shield sand barrier generally followed the exponential decay law. The double-layer sand barrier had more advantages than the single-layer sand barrier in the sand resistance effect， and the average sand resistance rate of the 2 mm aperture was the largest. （3） The height of sediment accumulation inside the net shield sand barrier increased with the increase of distance， and reached the maximum at the back end. The height of sediment accumulation behind the sand barrier gradually decreased until it was equal to the sand bed. The sediment accumulation of 2 mm aperture double-layer sand barrier was more concentrated， and the height and area of sediment accumulation also increased with the increase of wind velocity. （4） The double-layer net shield sand barrier with an aperture of 2 mm had the advantages of both airflow deceleration and sediment accumulation concentration. It adapted to different wind velocities and had the best windbreak and sand-fixing benefit. It provided theoretical basis and technical support for the sand control project of sandy islands and turtle spawning grounds in the South China Sea.

Key words: net shield sand barrier, aperture, single or double layer, windbreak and sand-fixing benefit

CLC Number:

S775

Jianjun Qu, Zhihao Zhu, Qihang Li, Yongping Gao, Ting Lin. Wind tunnel test on windbreak and sand-fixing effect of double-layer net shield sand barrier[J]. Journal of Desert Research, 2025, 45(3): 141-151.

Figures/Tables 15

Fig.1 Net shield sand barrier in the field

Fig.2 Single-layer （A） and double-layer （B） of the net shield sand barrier

Fig.3 Wind velocity measuring point （A）， sand sampler （B） and insertion position （C）

Fig.4 Inflow profile without sand barrier

Fig.5 Flow field around different types of the net shield sand barrier

Fig.6 Flow field around the net shield sand barrier under different free-stream wind velocities

Fig.7 The distribution of sediment discharge without sand barrier

Table 1 Fitting results of sediment discharge without sand barrier

风速/(m·s^-1)	c	d	f	R²	P
10	0.002	2.156	2.512	0.990	<0.001
14	0.064	14.941	2.979	0.992	<0.001
18	-0.089	23.085	6.216	0.903	<0.001

Fig.8 Distribution of sediment discharge in different types of net shield sand barrier

Table 2 Fitting results of sediment discharge in different types of net shield sand barrier

孔径 /mm	风速 /(m·s^-1)	单层					双层
孔径 /mm	风速 /(m·s^-1)	c	d	f	R²	P	c	d	f	R²	P
2	10	0.001	0.277	2.786	0.989	<0.001	-0.001	0.161	5.157	0.645	<0.001
	14	0.042	2.147	3.476	0.976	<0.001	0.034	2.238	2.964	0.984	<0.001
	18	0.287	13.571	3.338	0.979	<0.001	0.235	9.369	3.332	0.980	<0.001
3	10	0.003	0.442	2.652	0.991	<0.001	0.002	0.275	2.924	0.985	<0.001
	14	0.055	2.356	3.871	0.966	<0.001	0.077	1.548	4.693	0.928	<0.001
	18	0.324	10.958	4.811	0.962	<0.001	0.264	6.180	6.337	0.962	<0.001
4	10	0.003	0.487	2.652	0.989	<0.001	0.002	0.336	2.950	0.987	<0.001
	14	0.034	1.449	5.892	0.967	<0.001	0.062	2.029	3.605	0.966	<0.001
	18	0.238	7.212	4.351	0.960	<0.001	0.297	7.907	4.768	0.973	<0.001
8	10	0.002	0.401	2.440	0.991	<0.001	0.001	0.265	2.899	0.993	<0.001
	14	0.052	2.301	3.541	0.959	<0.001	0.033	1.371	4.429	0.973	<0.001
	18	0.271	8.769	4.426	0.956	<0.001	0.197	6.187	5.375	0.965	<0.001

Table 3 Reduction percentage of total sediment discharge in different types of net shield sand barrier （%）

孔径 /mm	层数	风速/(m·s^-1)			平均
孔径 /mm	层数	10	14	18	平均
2	单层	83.8	78.4	55.8	72.7
2	双层	84.8	81.6	67.8	78.1
3	单层	74.7	72.6	47.3	64.9
3	双层	82.3	73.1	59.1	71.5
4	单层	71.8	75.8	66.8	71.5
4	双层	78.2	75.6	59.3	71.0
8	单层	80.0	75.3	60.0	71.8
8	双层	84.0	82.0	66.9	77.7

Fig.9 The status of sediment accumulation inside and behind the net shield sand barrier

Fig.10 Status of erosion and deposition behind different types of the net shield sand barrier

Fig.11 Status of erosion and deposition behind the net shield sand barrier under different wind velocities

Fig.12 Status of erosion and deposition inside different types of the net shield sand barrier

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Wind tunnel test on windbreak and sand-fixing effect of double-layer net shield sand barrier

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