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Mechanism and effects of snow accumulations and controls by lightweight snow fences

Journal of Modern Transportation 2016年第4期24卷 261-269页

作者： Duote Liu Yongle Li Bin Wang Peng Hu Jingyu Zhang Department of Bridge Engineering Southwest Jiaotong University Department of Bridge Engineering Changsha University of Science and Technology

This paper investigates the snowdrift. caused by lightweight fences along the lines on the flatland through the computational fluid dynamics method. The characteristic ambient flows around the solid fences and the porous fences with varied heights and bottom wind gaps are simulated in the numerical model, and the working mechanism of ＂interception＂ and ＂scouring＂ of the lightweight fences are analyzed. Based on the friction velocities near the ground, two sets of criteria are proposed to evaluate the deposition and erosion effects of different fences. According to flow separation and reattachment, the simplified relationships between the most likely positions for snow accumulations and fence parameters are devel- oped. The study indicates that the capabilities for snow interception by the solid fence without wind gap and the distance from which to the second snow coverage center both increase with the fence height. Furthermore, it is found that the scouring range for snow surface increases significantly with the size of wind gap, and the snow accumulation rate on the leeward side decreases with the increasing fence porosity.

关键词： Lightweight fence snowdrift. cfd Mechanism of snow accumulation Fence type Fenceparameter

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