roughness length

The roughness length of vegetation cover surface depends on the type, height, coverage of the vegetation, zero-plane displacement height, free velocity, friction velocity and the atmospheric stratification stability.

植被覆盖面空气动力学粗糙度长度取决于植被类型、植被高度、覆盖度、零平面位移高度、自由风速、摩擦速度以及大气层结稳定度。

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Determination of Roughness Length on Gobi Deflation Plane and Vegetated Surface

戈壁风蚀面与植被覆盖面地表性质粗糙度长度的确定

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The roughness length will vary little along with wind speed and friction velocity when the wind speed increases to some extent.

当风速增大到一定程度时，粗糙度随着风速和摩擦速度变化都不明显。

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According to the micro-aggregates size distribution parameter 、 roughness length from the simulation of ground situation threshold friction velocity and friction wind speed;

由表土微团粒粒度分布参数、地表状况等模拟粗糙度、起动摩阻风速和摩阻风速；

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Research of correlation between aerodynamic roughness length And grain size distribution of cultivated soil

耕作地表土壤粒径分布与空气动力学粗糙度关系的研究

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The concept "aerodynamic roughness length" defined by Bagnold is an important parameter for wind erosion research. It has been widely applied in sand bed, vegetation conditions, snow bed and water surface.

由Bagnold提出的空气动力学粗糙度概念，是描述各种表面空气动力学特征的重要参数，已被广泛应用于沙面、植被覆盖表面、雪面、水面等。

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The amount of the departure may not necessarily be large, but it results in the larger errors when the profiles are used to calculate the bed roughness length and shear stress.

虽然偏离值可能不大，但利用对数剖面去计算河底粗糙长度和剪切应力时会引起较大的误差。

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