沙蒿植被粗糙度动力学特性的检验与研究

主要利用D ong等提出的曲线拟合的方法,结合野外实测数据计算沙蒿植被的空气动力学粗糙度,对计算出的粗糙度和风速进行回归分析和相关分析,由此对沙蒿植被地表粗糙度的动力学特性进行检验与研究,结果表明:在下垫面不发生改变的情况下,沙蒿的空气动力学粗糙度与风速的增长呈负相关关系,即粗糙度具有动力学特性。但是由于两者相关程度并不显著,因此在实际工作中可以忽略风速对粗糙度的影响,仍然应用B agno ld的传统方法对粗糙壁面的粗糙度进行测量。

Study on the Dynamical Characteristic of the Roughness of Artesimia.arenaria DC.

According to the curve,which was put forward by Dong,and the field data,the authors analyzed the relationship between the roughness and the wind velocity.The result was that above the stable roughness surface,the roughness of vegetation decreased while the wind velocity was increasing,namely,the roughness had the dynamical characteristic.However,because the correlativity between them was not significant,the effect could be put aside in the practice.