长宽比对长方体周边风致积雪分布影响

THE INFLUENCE OF ASPECT RATIO ON SNOW DISTRIBUTION AROUND A CUBOID MODEL

  • 摘要: 建筑物周边风致积雪是冬季多雪大风地区最常见的自然灾害之一。由于风吹雪的机理复杂,虽然数值模拟方法近几年取得了丰硕的成果,但方程及参数设置仍存在不足,实测数据库中又仅有在风雪流中单个立方体模型周边积雪的实测对比数据,模拟方法得不到广泛验证,缺乏模型的多样性限制了预测方法的进一步提升和推广。为了揭示不同长宽比对建筑物周边积雪分布的影响,对不同工况下长方体周边积雪分布进行了现场实测,同时用数值模拟方法模拟了不同工况下长方体周边风场,讨论了风场与其积雪分布的关系。结果表明:该模拟方法利用模型周边风速分布能较好地推测出积雪侵蚀堆积范围,对于不同长宽比的建筑,迎风侧积雪分布只与建筑高度有关,长宽比对其影响不大,横风向侵蚀影响范围与建筑长度成正比,且背风侧侵蚀范围受建筑长度影响较大,建筑宽度对其周边积雪分布影响较小。

     

    Abstract: Snow accumulation around buildings is one of the most common natural disasters in snowy and windy areas in winter. Although numerical simulation has achieved fruitful results in recent years, the parameter setting is still insufficient due to the limited measurement data of the snow around a single cube model in the wind and snow flow. Therefore, the simulation method has not been widely verified due to the lack of field measurements, which limits the further improvement and promotion of the prediction method. To reveal the influence of aspect ratio on the snow distribution around buildings, the snow distribution around cuboid models at various conditions was measured on-site. Meanwhile, the numerical method was used to simulate the wind field around the models. The wind field and snow distribution around the model were compared to show the correlation. The results show that the wind speed around the model can well predict the snow erosion and accumulation range. For buildings with different aspect ratios, the snow distribution on the windward side is only related to the height of the building. The aspect ratio has slight influence on it. The cross-wind erosion range is proportional to the length of the building, and the leeward side erosion range is greatly affected by the length of the building. The width of the building insignificantly influences the distribution of surrounding snow.

     

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