地面粗糙度 meaning in Chinese

terrain roughness

( 2 ) increasing of wind is mainly induced by shf and affecting of lhf is very little . ( 3 ) effect of terrain increases ground rough and tonsure of terrain press and fiction correspond enhance frictional damp effect
( 3 )地形作用相当于增加了地面粗糙度，地形压力梯度项与摩擦项地叠加，相当于使摩擦阻尼作用增大，地形强迫作用使下边界层从上至下风速减小，风向向左偏转。
The reason is that the quality and function of current forest can not match the natural primeval forest with perfect soil conservation effectiveness . because unitary surface material and less land surface roughness which can not retain runoff lead to short confluence time , quick delivery of flood , easy superposition of floods , and result to flood disaster
原因是目前的森林质量和功能都无法与具有水土保持功能的原始森林相比，其地表组成物质太少且单一，地面粗糙度低，起不到对地表径流的阻挡作用，致使地面径流汇流时间缩短，洪水下泄快并容易形成洪水叠加，导致洪涝灾害加剧。