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Journal of Desert Research ›› 2026, Vol. 46 ›› Issue (3): 304-317.DOI: 10.7522/j.issn.1000-694X.2025.00247

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Numerical simulation of the effect of sand-fixing plant Haloxylon ammodendron on the wind-sand flow field

Guanglu Hu1,2(), Nana He1, Yeye Zhang1, Kun Chen1, Taoyang Jin1, Jiaqi Wang1, Kaifu Tian1   

  1. 1.School of Environmental and Municipal Engineering /, Lanzhou Jiaotong University,Lanzhou 730070,China
    2.MOE Engineering Research Center for Comprehensive Utilization of Water Resources in Cold and Arid Regions, Lanzhou Jiaotong University,Lanzhou 730070,China
  • Received:2025-07-12 Revised:2025-10-21 Online:2026-05-20 Published:2026-06-11

Abstract:

Plant sand fixation is one of the important measures to prevent and control sandstorms in arid and semi-arid areas. As a typical drought-resistant, saline-alkalinity-resistant and wind-erosion-resistant desert plant in arid zones, Haloxylon modendron, with its remarkable effect of wind and sand fixation, has been widely planted in the middle reaches of the Heihe River in the transition zone of deserts-oasis. In this paper, we numerically simulate the wind and sand flow field near H. modendron by Fluent computing platform, analyze the wind speed characteristics and sand accumulation characteristics around H. modendron, and use the field test data for verification. The results show that: (1)Under the conditions of different wind speeds, the wind-sand flow field around H. modendron can form four partitions, but there are significant differences in the structural scale and disturbance intensity of the flow field in each area. When the inlet wind speed was 6 m·s-1, there were three vortex zones on the leeward side of H. modendron, and the range of the static wind zone could be extended to 3H (H is the height of the plant), and the kinetic energy of the airflow recovered slowly; while at 12 m·s-1, there were only two weak vortex zones on the leeward side, and the range of the static wind zone was narrowed down to 1.2H, and the kinetic energy recovered more quickly. (2)The windproof effect of H. modendron is positively correlated with its crown width, the wider the crown width, the better the windproof effect. The overall performance of windproof efficiency at different locations of H. modendron is that the leeward face>windward face>side wind face, and the reduction of wind speed on the leeward face can reach 50%-90%; the reduction of wind speed on the windward face is 30%-60%; and the reduction of wind speed on the side is only 10%-30%.(3)The sand-blocking ability of H. modendron was significantly different under different wind speed conditions. When the inlet wind speed was 6 m·s-1, the sand particles were deposited at -0.75H-1H; while when the wind speed increased to 12 m·s-1, the sand particles were deposited at 0-1H. (4)Increasing the number of rows and optimizing the row spacing can improve the sand blocking ability of H. modendron, of which the overall sand blocking effect is optimal when the pike rows are spaced 5m apart.

Key words: Haloxylon ammodendron, windbreak and sand fixation, numerical simulation, sandstorm field, volume fraction

CLC Number: