| 耕作土壤表面的空气动力学粗糙度及其对土壤风蚀的影响 |
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| 引用本文： | 张春来,邹学勇,董光荣,刘玉璋.耕作土壤表面的空气动力学粗糙度及其对土壤风蚀的影响[J].中国沙漠,2002,22(5):473-475. |
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| 作者姓名： | 张春来 邹学勇 董光荣 刘玉璋 |
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| 作者单位： | 1. 北京师范大学 中国沙漠研究中心, 教育部自然灾害与资源环境重点实验室, 资源科学研究所, 北京 100875;2. 中国科学院 寒区旱区环境与工程研究所, 北京 100875 |
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| 基金项目： | 中国科学院寒区旱区环境与工程研究所知识创新项目(CACX210026);国家自然科学基金项目(4017011)资助 |
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| 摘 要： | 土壤表面粗糙度是影响耕作土壤抗风蚀能力的一个重要因素。根据风速廓线计算得到的空气动力学粗糙度,可以简捷而有效地刻画土壤表面的空气动力学性质。风洞模拟实验表明,耕作土壤表面的空气动力学粗糙度主要取决于暴露地表的土块直径,在土块大致均匀分布的条件下,直径愈大,空气动力学粗糙度愈大。土壤风蚀速率则随空气动力学粗糙度的增大而迅速减小,二者具有良好的相关性。
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| 关 键 词： | 空气动力学粗糙度 耕作土壤 土壤风蚀 风洞实验 |
| 文章编号： | 1000-694X(2002)05-0473-03 |
| 收稿时间： | 2002-07-01 |
| 修稿时间： | 2002年7月1日 |
Aerodynamic Roughness of Cultivated Soil and Its Influence on Soil Erosion by Wind in a Wind Tunnel |
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| ZHANG Chun-lai,ZOU Xue-yong,DONG Guang-rong,LIU Yu-zhang.Aerodynamic Roughness of Cultivated Soil and Its Influence on Soil Erosion by Wind in a Wind Tunnel[J].Journal of Desert Research,2002,22(5):473-475. |
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| Authors: | ZHANG Chun-lai ZOU Xue-yong DONG Guang-rong LIU Yu-zhang |
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| Institution: | 1. China Center of Desert Research at Beijing Normal University; Key Laboratory of Environmental Change and Natural Disaster of the Ministry of Education of China; Institute of Resources Science, Beijing Normal University, Beijing 100875, China;2. Cold and Arid Regions Envirom=nmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Surface roughness is an important feature that affects wind erosion. Aerodynamic roughness calculated by wind profile can be employed to depict aerodynamic properties of cultivated soil effectively. Wind tunnel tests show that aerodynamic roughness length is mainly determined by the diameter of the largest soil clods exposed and uniformly distributed on the soil surface. Wind erosion rates decrease with aerodynamic roughness length. There are good relationships between soil wind erosion rates and aerodynamic roughness length. |
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| Keywords: | Aerodynamic roughness cultivated soil soil wind erosion wind tunnel test |
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