| 沙漠与沙漠化 |
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| Simulation Analysis of Vegetation Covered Surfaces Aerodynamics Roughness Length and Zero Displacement |
| ZHANG Ya jing; SHEN Xiang dong |
| College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China |
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Abstract Aerodynamic roughness length (ARL) and zero displacement height are important aerodynamic parameters of vegetation covered surface. By the numerical method and the Mathematics Software Matlab the aerodynamic roughness length and displacement height of vegetation covered surface in Siziwangqi of Inner Mongolia was simulated. The relations of aerodynamic parameters with wind velocity under 8 kinds of vegetation density and 6 kinds of vegetation height have been gotten, and the result has been compared with the field experimental data. For details, the following models have been given in simulation: relation models of wind speed with friction speed and aerodynamic roughness length under different vegetation density and different vegetation height. These models could be used to estimate the aerodynamic parameters. The research conclusion has profound significance in further studying about sandstorm movement mechanism over vegetation covered surface and about the mechanical characteristics on interaction
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Received: 22 January 2007
Published: 20 January 2008
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2008, Vol. 28 
