Objective Wind tunnel simulation tests of high-density polyethylene(HDPE) board fences with the same hole diameter but different opening directions were conducted in order to provide a theoretical basis for the better application and better effect of HDPE board sand-blocking fences. Methods Wind tunnel simulations compared wind speed profiles, aerodynamic parameters, flow field characteristics and windbreak efficiency between fences featuring holes oriented horizontally versus vertically. The analysis focused on the impact of hole orientation (horizontal vs. vertical) on windproof performance. Results Both fence types exhibited logarithmic wind speed distributions at -1 H (H = fence height of 23 cm) upwind and 9 H downwind (p<0.05). The vertical hole configuration demonstrated superior profile stability, with higher aerodynamic roughness and greater friction speed than its horizontal counterpart. Flow field analysis revealed that the horizontal fence exhibited notable near-surface acceleration zones (from -1 H to 2 H), and its deceleration zone split into two parts (1—5 H and 8—15 H) in response to increased wind speed. However, the vertical fence effectively regulated sand transport through controlled speed gradient attenuation, and its deceleration zone changed little with the increase in wind speed. In particular, the vertical fence’s deceleration zone maintained stable aerodynamic characteristics across the wind speed regimes. Windbreak efficiency progression showed three phases: a moderate improvement of 5.1%—8.4% (from -7 H to -1 H), abrupt decline of 43.3%~55.6% (from -1 H to 1 H), and a gradual increase in stability (43.3%—55.6%) post -1 H. At higher wind speeds, the windbreak efficiency of the vertical fence was 50.4% higher than that of the horizontal fence (p<0.05). Notably, the efficiency of the horizontal fence decreased by 45.6% with increasing wind speed (p<0.05), whereas the vertical fence maintained consistent performance (p>0.05). Conclusion HDPE fence with vertically oriented holes demonstrated superior comprehensive wind speed reduction capacity, remarkable flow field stability, and maintained performance across variable wind conditions, indicating significant potential for large-scale application in sand control and desertification prevention engineering.
文献参数: 尚小伟, 王云正, 刘建国, 等.横孔与竖孔HDPE板栅栏防风效益对比的风洞模拟[J].水土保持通报,2025,45(4):134-142. Citation:Shang Xiaowei, Wang Yunzheng, Liu Jianguo, et al. Wind tunnel simulation comparing windproof performance of high-density polyethylene board fences with horizontal versus vertical holes [J]. Bulletin of Soil and Water Conservation,2025,45(4):134-142.
高密度聚乙烯(high density polyethylene,简称HDPE)材料阻沙栅栏具有化学稳定性、耐热性和耐冻融性,且抗紫外线性能强,耐老化,施工过程方便[1-3],在光伏电站、铁路、公路、居民点的风沙防治中得到广泛应用[4-5]。王逸敏等[6]对比HDPE栅栏和草方格沙障对植被的影响,得出HDPE栅栏中植被的物种数大于同期草方格沙障中的物种数。祁帅等[7]对比不同类型沙障对沉积物的影响,得出土壤颗粒组成优化表现为:HDPE栅栏>沙柳沙障>PLA沙障。李敏岚等[8]研究HDPE栅栏与草方格沙障对土壤水分的影响,发现HDPE栅栏蓄水保水效果高于草方格沙障。
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