Effect of transverse ridge microtopography on aerodynamic characteristics of near-surface air
In dryland farmland,tilled soil ridges are often used as part of a wind erosion control system,but the mechanism of their effect on near-surface wind velocity is not yet clear.So,we used a wind tunnel experiment to measure the near-surface wind velocity under ridge microtopographic conditions.The results showed that the airflow passes through the surface covered with ridges,the wind velocity changes mostly around the first row of ridges,and then gradually decreases and stabilizes,showing a regular fluctuation in near-surface wind velocity along the wind direction.Compared to the no-ridge condition,the wind velocity reduction rate of all ridge structures is more than 33％.Different ridge structures have different impact mechanisms on near-surface airflow.When the ridge spacing is smaller,the wind profile is mainly in two segments,and the ridge affects the airflow in the form of rough elements.When the ridge spacing is larger,the horizontal distance of the wind velocity reduction and recovery between the ridges increases,and the wind profile is mainly in three segments,at which point the ridge acts as wind barriers.
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