36 research outputs found
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Some aerodynamic features of a cotton canopy
Analysis of profiles measured over irrigated cotton in the Sudan Gezira showed that the crop boundary
layer remained stable throughout most of the day. The shape of wind profiles measured within the canopy
suggested that momentum was absorbed mostly in the upper layers of the canopy, with the lower regions
remaining isolated from the microclimate above. A similarity analysis based on dynamic scaling factors
yielded a generalized wind profile from which momentum diffusivities and mixing lengths were calculated.
The analysis showed that aerodynamic features of the upper layers of the canopy were characterized by the
friction velocity and the height of the zero-plane displacement