| 风沙起动的随机性及其判别 |
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| 引用本文： | 董治宝.风沙起动的随机性及其判别[J].甘肃气象,2006,24(3):1-4. |
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| 作者姓名： | 董治宝 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室 甘肃兰州730000 |
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| 摘 要： | 风沙颗粒起动的判别标准的不一致,是造成目前关于颗粒起动风速研究成果不一致的重要因素之一。由于颗粒起动过程中,气流瞬时速度或瞬时切应力、颗粒在床面上的相对位置以及非均匀沙在特定的某个点的粒径是随机变量,所以风沙颗粒的起动具有随机性。这种随机性导致在实验观察中,风沙起动判别标准的不一致。借鉴泥沙起动研究的理论与成果,将风沙颗粒起动可分为个别起动、少量起动和大量起动,并给出泥沙研究中的判别标准,供风沙研究者参考。
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| 关 键 词： | 风沙起动 随机性 判别标准 |
| 文章编号： | 1006-7639（2006）-03-0001-04 |
| 收稿时间： | 2006-05-26 |
| 修稿时间： | 2006-05-28 |
The Stochastic Nature and Definition of Particle Entrainment by Wind |
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| DONG Zhi-bao.The Stochastic Nature and Definition of Particle Entrainment by Wind[J].Gansu Meteorology,2006,24(3):1-4. |
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| Authors: | DONG Zhi-bao |
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| Institution: | Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Differences in the criteria for discriminating the initiation of particle movement is one of the factors leading to disparities in the results of threshold wind velocity.The particle entrainment process in response to wind action is stochastic due to the turbulent nature of wind,the stochastic positions of the particles and particle size.The stochastic nature of particle entrainment process results in differences in the criteria for discriminating the initiation of particle movement.Using the theories and conclusions in fluvial sedimentation studies, the initiation of particles by wind can be classified into individual initiation,small amount initiation and large amount initiation.The corresponding discrimination criteria are provided as references for aeolian researchers. |
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| Keywords: | wind initiation of particles stochastic nature discrimination criteria |
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