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Assessing the uncertainties of using land-based wind observations for determining extreme open-water winds

Authors :
M. Bottema
C. Geerse
S. Caires
G. Groen
H. de Waal
Nander Wever
J. Groeneweg
Source :
Journal of Wind Engineering and Industrial Aerodynamics. 110:70-85
Publication Year :
2012
Publisher :
Elsevier BV, 2012.

Abstract

For the assessment of the safety of the Dutch flood defences extreme open-water winds need to be computed. There are, however, no sufficiently long and reliable in-situ data available. On the other hand, there is a rich dataset of decades of measurements at certain coastal and relatively close by inland stations. A commonly used two-layer model for neutral atmospheres was thought to provide reasonably accurate open-water winds from the available data, given that the model assumptions seemed plausible for the extreme winds of interest. However, the model results were deemed inaccurate and not usable. Given that this was unexpected, many of the model assumptions were analysed and, with the gained further insight, their validity and contribution to the invalidity of the deemed simple model approach assessed. Our conclusion is that the quality of the model results is significantly affected by at least two aspects: the assumption of neutral stability in the model, and – equally important – the assumption of independence between the surface roughness and the wind speed.

Details

ISSN :
01676105
Volume :
110
Database :
OpenAIRE
Journal :
Journal of Wind Engineering and Industrial Aerodynamics
Accession number :
edsair.doi...........b27a8fc5e60a6bbfd62284712b43af3d
Full Text :
https://doi.org/10.1016/j.jweia.2012.07.009