Wind tunnel simulations on windbreak efficiency of sand barriers made of plant fiber nets

doi:10.7522/j.issn.1000-694X.2024.00168

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (1): 242-248.DOI: 10.7522/j.issn.1000-694X.2024.00168

Wind tunnel simulations on windbreak efficiency of sand barriers made of plant fiber nets

Yawen Deng¹^,²(), Ruiping Zu¹(), Yumei Zong³, Junzhan Wang¹, Yi Li¹

^1.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China
^3.Shaanxi Xuelin Education Science and Technology Research Institute，Xi'an 710000，China

Received:2024-11-13 Revised:2024-12-05 Online:2025-01-20 Published:2025-01-13
Contact: Ruiping Zu

Abstract

Abstract:

Checkboard sand barriers are currently the most widely used measure for wind and sand protection， and the specifications of the sand barriers directly determine their protective effectiveness. Through systematic wind tunnel experiments， this study obtained wind speed data for plant fiber net sand barriers with different specifications at various heights and positions， and analyzed their flow field structure， wind speed profiles， and windbreak efficiency. The results indicate：（1） Sand barriers with different specifications exhibit similar flow field structures， and could be functionally divided into four parts： a pre-barrier deceleration zone， an obstacle-encountered lift zone， a flow concentration and acceleration zone， and an internal vortex deceleration zone within the sand barriers. （2） For the same specification of sand barriers， wind speed profiles vary at different positions. Far upstream from the sand barriers， the wind speed profiles exhibit logarithmic changes. As approaching the sand barriers， the wind speed profiles begin to deviate from logarithmic distribution， particularly between two sand barriers， the wind speed profiles show irregular changes. （3） As the height of the sand barriers increases， the windbreak efficiency also shows a certain increasing trend. Sand barriers with height-to-spacing ratios of 0.25 and 0.1 exhibit relatively high windbreak efficiency， while those with a height-to-spacing ratio of 0.05 have less ideal windbreak efficiency. The above research findings can provide a reference for the scientific configuration of sand barriers in windbreak and sand-fixation practices.

Key words: wind tunnel simulation, sand barrier flow field, wind speed profile, windbreak efficiency

CLC Number:

P931.3

Yawen Deng, Ruiping Zu, Yumei Zong, Junzhan Wang, Yi Li. Wind tunnel simulations on windbreak efficiency of sand barriers made of plant fiber nets[J]. Journal of Desert Research, 2025, 45(1): 242-248.

Figures/Tables 6

References 29

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沙障高度（H）/ 沙障间距（L）	沙障高度 /cm	防风效能/%
沙障高度（H）/ 沙障间距（L）	沙障高度 /cm	第一道沙障后	第一道沙障后1H	沙障中心	第二道沙障前
0.3	2	26.61	50.33	61.70	44.30
	4	65.13	70.73	71.29	47.11
	6	47.68	66.96	71.12	48.35
	8	49.59	66.50	69.89	63.33
0.25	2	45.99	59.30	55.75	39.69
	4	63.22	66.09	68.81	58.48
	6	60.40	66.27	70.33	71.68
	8	74.37	76.97	80.18	58.68
0.2	2	31.38	35.75	41.54	23.77
	4	54.02	70.54	66.55	55.69
	6	52.09	59.69	66.17	44.79
	8	65.43	80.93	78.85	68.41
0.15	2	42.62	51.06	59.43	45.87
	4	55.82	55.83	59.41	44.32
	6	53.67	56.54	63.95	59.69
	8	51.23	73.10	74.94	53.24
0.1	2	17.99	51.30	58.32	36.22
	4	52.16	59.80	67.54	50.55
	6	54.50	74.67	65.75	51.57
	8	61.31	80.88	85.03	72.21
0.05	2	38.59	48.80	55.03	33.26
	4	57.26	61.17	72.58	35.58
	6	53.60	66.83	74.80	28.99
	8	55.61	74.55	75.97	58.98

沙障高度（H）/ 沙障间距（L）	沙障高度 /cm	防风效能/%
沙障高度（H）/ 沙障间距（L）	沙障高度 /cm	第一道沙障后	第一道沙障后1H	沙障中心	第二道沙障前
0.3	2	26.61	50.33	61.70	44.30
	4	65.13	70.73	71.29	47.11
	6	47.68	66.96	71.12	48.35
	8	49.59	66.50	69.89	63.33
0.25	2	45.99	59.30	55.75	39.69
	4	63.22	66.09	68.81	58.48
	6	60.40	66.27	70.33	71.68
	8	74.37	76.97	80.18	58.68
0.2	2	31.38	35.75	41.54	23.77
	4	54.02	70.54	66.55	55.69
	6	52.09	59.69	66.17	44.79
	8	65.43	80.93	78.85	68.41
0.15	2	42.62	51.06	59.43	45.87
	4	55.82	55.83	59.41	44.32
	6	53.67	56.54	63.95	59.69
	8	51.23	73.10	74.94	53.24
0.1	2	17.99	51.30	58.32	36.22
	4	52.16	59.80	67.54	50.55
	6	54.50	74.67	65.75	51.57
	8	61.31	80.88	85.03	72.21
0.05	2	38.59	48.80	55.03	33.26
	4	57.26	61.17	72.58	35.58
	6	53.60	66.83	74.80	28.99
	8	55.61	74.55	75.97	58.98

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Wind tunnel simulations on windbreak efficiency of sand barriers made of plant fiber nets

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Figures/Tables 6

References 29

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沙障高度（H）/cm	沙障高度（H）/沙障间距（L）
沙障高度（H）/cm	0.05	0.1	0.15	0.2	0.25	0.3
2	40	20	13	10	8	7
4	80	40	27	20	16	13
6	120	60	40	30	24	20
8	160	80	53	40	32	27