| 风雪流临界起动风速的研究 |
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| 引用本文： | 马高生,黄宁.风雪流临界起动风速的研究[J].兰州大学学报(自然科学版),2006,42(6):130-134. |
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| 作者姓名： | 马高生 黄宁 |
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| 作者单位： | 1. 兰州大学,土木工程与力学学院,甘肃,兰州,730000
2. 兰州大学,西部灾害与环境力学教育部重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金，高等学校博士学科点专项科研项目，中国科学院"西部之光"人才培养计划 |
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| 摘 要： | 雪粒的起动以及临界起动风速是研究风雪流的形成过程中需要关注的首要问题.通过对雪粒的受力机制及其起动条件进行分析,建立了雪粒在平稳风场下的起动模型;研究了雪粒的临界起动风速以及临界起动风速与雪粒粒径、积雪时间和雪表温度的关系.结果表明,临界起动摩阻风速随着雪粒粒径的增大而增大;对于稳定的雪表温度,雪粒的起动摩阻风速在1000 s内是随时间而增加的,最终达到一个稳定值.起动摩阻风速随雪表温度的增大而增大,当雪表温度大于263 K时,其对临界起动摩阻风速影响很大;当雪表温度小于263 K时,其对临界起动摩阻风速影响相对较小.
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| 关 键 词： | 粘聚力 临界摩阻风速 积雪时间 雪表温度 |
| 文章编号： | 0455-2059（2006）06-0130-05 |
| 收稿时间： | 01 2 2006 12:00AM |
| 修稿时间： | 2006-01-02 |
Threshold wind-speed of snow drifting |
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| MA Gao-sheng,HUANG Ning.Threshold wind-speed of snow drifting[J].Journal of Lanzhou University(Natural Science),2006,42(6):130-134. |
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| Authors: | MA Gao-sheng HUANG Ning |
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| Institution: | 1. Department of Mechanics and Engineering Science, Lanzhou University, Lanzhou 730000, China; 2.Key Laboratory of Mechanics on Western Disasters and Environment, Ministry of Education of China Lanzhou University, Lanzhou 730000, China |
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| Abstract: | The initiation and threshold wind speed of snow particles are basic to the research of snow drifting. Through analysis of the forces on particles, this paper establishes a model of initiation of snow particles under stable wind speed. Then the relationships among the threshold wind speed and particle size, duration time of snow particle and surface temperature of particles are analyzed. The results show that the threshold wind speed increases with the particle size. For the constant surface temperature the threshold wind speed increases as the duration time of snow particle increases when the duration time is shorter than 1 000 second and finally it will attains a stable value. The results also show that the threshold wind speed increases as the surface temperature increases and the effects of the surface temperature on the threshold wind speed are great when the surface temperature is higher than 263 K and its effects are relatively smaller when the surface temperature is below 263 K. |
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| Keywords: | coherent force threshold wind speed duration time of snow particle surface temperature of particle |
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