| Study of Aerodynamic Parameters on Different Underling Surfaces |
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| 作者姓名： | MAO Yuhao LIU Shuhu ZHANG Chenyi LIU Lichao LI Jing |
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| 作者单位： | Department of Atmospheric Sciences School of Physics Peking University，Department of Atmospheric Sciences，School of Physics Peking University，Laboratory of Climate Research，National Climatic Center China Meteorological Administration，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Department of Atmospheric Sciences，School of Physics Peking University，Beijing 100871 Laboratory of Climate Research National Climatic Center China Meteorological Administration Beijing 100081，Beijing 100871 Laboratory of Climate Research National Climatic Center China Meteorological Administration Beijing 100081，Beijing 100081，Lanzhou 730000，Beijing 100871 Laboratory of Climate Research National Climatic Center China Meteorological Administration Beijing 100081 |
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| 基金项目： | 高等学校博士学科点专项科研项目;国家自然科学基金 |
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| 摘 要： | Aerodynamic parameters including the zero-plane displacement (d), roughness length (20), and friction velocity (u*) on the different underlying surfaces of heavy-grazing site, medium-grazing site, light-grazing site, no-grazing site, dune, inter-dune, grassland, rice paddy site, wheat site, soybean site, and maize site have been computed based on the Monin-Obukhov similarity theory by utilizing the micrometeorologically observed data of dune and vegetation in the semi-arid area at Naiman, Inner Mongolia of China, conducted jointly by the Institute of Desert Research, Chinese Academy of Sciences and the National Institute of Agro-Environmental Sciences of Japan in 1990-1994. And their relationships between wind speed and Richardson number are analyzed. The aerodynamic characteristics of different man-made disturbed grassland ecosystems are also compared. Result shows that the vegetation coverage and the above-ground biomass decrease with the increase in man-made stress of the grassland. The roughness length for different underlying surfaces is closely related to vegetation height, above-ground biomass, and ground surface undulation, and Richardson number Ri is also its influencing factor. The friction velocity varies largely on different underlying surfaces, and it is positively proportional to wind speed and roughness length. The aerodynamic parameters of various times on the same underlying surface are different, too. Above results indicate that grassland and vegetation are of significance in preventing desertification, especially in the arid and semi-arid land ecosystems. And the results of this paper are also important for constructing the land surface physical process as well as regional climate model.
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| 关 键 词： | 下垫面 空气动力学参数 人造摄动草原生态系 放牧强度 植被 内蒙古 |
| 收稿时间： | 1/6/2007 12:00:00 AM |
Study of Aerodynamic Parameters on Different Underling Surfaces |
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| MAO Yuhao,LIU Shuhu,ZHANG Chenyi,LIU Lichao,LI Jing.Study of Aerodynamic Parameters on Different Underling Surfaces[J].Acta Meteorologica Sinica,2007,21(1):87-97. |
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| Authors: | MAO Yuhao LIU Shuhua ZHANG Chenyi LIU Lichao and LI Jing |
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| Institution: | [1]Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871 [2]Laboratory. of Climate Research, National Climatic Center, China Meteorological Administration, Beijing 100081 [3]Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | Aerodynamic parameters including the zero-plane displacement (d), roughness length (20), and friction velocity (u*) on the different underlying surfaces of heavy-grazing site, medium-grazing site, light-grazing site, no-grazing site, dune, inter-dune, grassland, rice paddy site, wheat site, soybean site, and maize site have been computed based on the Monin-Obukhov similarity theory by utilizing the micrometeorologically observed data of dune and vegetation in the semi-arid area at Naiman, Inner Mongolia of China, conducted jointly by the Institute of Desert Research, Chinese Academy of Sciences and the National Institute of Agro-Environmental Sciences of Japan in 1990-1994. And their relationships between wind speed and Richardson number are analyzed. The aerodynamic characteristics of different man-made disturbed grassland ecosystems are also compared. Result shows that the vegetation coverage and the above-ground biomass decrease with the increase in man-made stress of the grassland. The roughness length for different underlying surfaces is closely related to vegetation height, above-ground biomass, and ground surface undulation, and Richardson number Ri is also its influencing factor. The friction velocity varies largely on different underlying surfaces, and it is positively proportional to wind speed and roughness length. The aerodynamic parameters of various times on the same underlying surface are different, too. Above results indicate that grassland and vegetation are of significance in preventing desertification, especially in the arid and semi-arid land ecosystems. And the results of this paper are also important for constructing the land surface physical process as well as regional climate model. |
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| Keywords: | different underlying surfaces aerodynamic parameter different man-made disturbed grassland ecosystems |
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