Regional roughness of the landes forest and surface shear stress under neutral conditions |
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Authors: | Marc B Parlange Wilfried Brutsaert |
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Institution: | (1) School of Civil and Environmental Engineering, Hollister Hall, Cornell University, 14853-3501 Ithaca, NY, USA |
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Abstract: | Mean wind velocity profiles were measured by means of radio-windsondes over the Landes region in southwestern France, which consists primarily of pine forests with scattered villages and clearings with various crops. Analysis of neutral profiles indicated the existence of a logarithmic layer between approximately z – d
0 = 67(±18)z
0 and 128(+-32)z
0 (z is the height above the ground, z
0 the surface roughness and d
0 the displacement height). The upper limit can also be given as z – d
0 = 0.33 (±0.18)h, where h is the height of the bottom of the inversion. The profiles showed that the surface roughness of this terrain is around 1.2 m and the displacement height 6.0 m. Shear stresses derived from the profiles were in good agreement with those obtained just above the forest canopy at a nearby location with the eddy correlation method by a team from the Institute of Hydrology (Wallingford, England). |
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Keywords: | |
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