植被高度、密度、覆盖度、侧影盖度等特征，通过影响下垫面空气动力学粗糙度来达到抑制风蚀的效果。
Vegetation characteristics, such as height, density, coverage, lateral coverage of vegetation are closely related to the aerodynamic roughness length.
为了定量描述北京城市下垫面的空气动力学特征，为模式提供准确的下垫面参数。
Quantified understanding of aerodynamic parameters in urban areas is of great importance in the model study.
三面进风设计，合理的空气动力学，低能耗净化效率。
Three face into the wind design, reasonable space Gas dynamics, low energy efficiency.
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