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Wind profiles and change of terrain roughness at Risø
Author(s) -
Panofsky H. A.,
Petersen E. L.
Publication year - 1972
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709841811
Subject(s) - roughness length , terrain , surface finish , geology , surface roughness , wind direction , tower , homogeneous , meteorology , wind profile power law , wind speed , geometry , geodesy , mechanics , atmospheric sciences , materials science , physics , geography , mathematics , oceanography , cartography , archaeology , composite material , thermodynamics
The Risø 125 m tower is situated on a narrow peninsula, surrounded by bays of varying width. The resulting surface roughness changes are clearly reflected by ‘kinks’ in the measured wind profiles, whose characteristics depend on the wind direction. The height of the lowest kink for water‐to‐land trajectories is in good agreement with theory. The roughness lengths computed for the immediate surrounding of the tower vary with wind direction in a manner consistent with terrain features. However, the roughness lengths of the water estimated from the profiles are unrealistically small. The mean profiles obtained when the trajectory passes over relatively homogeneous terrain are represented quite well by wind profile expressions that are usually applied only in the surface layer.