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Adrie F. G. Jacobs
Emile Schols


The surface roughness parameter, z 0, can be estimated with different techniques. These techniques are analyzing the mean wind profile, estimating the surface drag coefficient and using the universal functions according to the Monin-Obukhov similarity theory. The first two techniques mentioned have been applied over more or less homogeneous terrain. As a result, it appears that the drag method is very sensitive to shear stress measuring errors and to local changes and irregularities in terrain.

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