| Pulsatory characteristics of wind velocity in sand flow over typical underlying surfaces |
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| 作者姓名： | ZHANG KeCun QU JianJun ZU RuiPing & FANG HaiYan Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China |
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| 作者单位： | ZHANG KeCun，QU JianJun，ZU RuiPing & FANG HaiYan 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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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | Pulsatory characteristics of wind velocity in sand flow over Gobi and mobile sand surface have been investigated experimentally in the wind tunnel. The primary goal of this paper is to reveal the relation- ship between pulsatory characteristics of instantaneous wind speed in sand flow and the motion state of sand grains. For a given underlying surface, pulsation of wind velocities in sand flow on different heights has a good correlation. As the space distance among different heights increases, fluctuation of instantaneous wind speed presents a decreasing trend and its amplitude is closely related to the mo- tion state of sand grains and their transport. Pulsatory intensity increases with the indicated wind speed, but its relative value does not depend on it, only agrees with height.
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| 收稿时间： | 7 September 2005 |
| 修稿时间： | 10 February 2006 |
Pulsatory characteristics of wind velocity in sand flow over typical underlying surfaces |
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| ZHANG KeCun,QU JianJun,ZU RuiPing & FANG HaiYan Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou ,China.Pulsatory characteristics of wind velocity in sand flow over typical underlying surfaces[J].Science in China(Earth Sciences),2007,50(2):247-253. |
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| Authors: | Zhang KeCun Qu JianJun Zu RuiPing Fang HaiYan |
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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: | Pulsatory characteristics of wind velocity in sand flow over Gobi and mobile sand surface have been investigated experimentally in the wind tunnel. The primary goal of this paper is to reveal the relation- ship between pulsatory characteristics of instantaneous wind speed in sand flow and the motion state of sand grains. For a given underlying surface, pulsation of wind velocities in sand flow on different heights has a good correlation. As the space distance among different heights increases, fluctuation of instantaneous wind speed presents a decreasing trend and its amplitude is closely related to the mo- tion state of sand grains and their transport. Pulsatory intensity increases with the indicated wind speed, but its relative value does not depend on it, only agrees with height. |
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| Keywords: | underlying surface sand flow pulsation of wind speed |
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