Open AccessSimulated wind power off‐shore using different parametrizations for the sea surface roughness
Author(s) -
Frank Helmut P.,
Larsen Søren E.,
Højstrup Jørgen
Publication year - 2000
Publication title -
wind energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 92
eISSN - 1099-1824
pISSN - 1095-4244
DOI - 10.1002/1099-1824(200004/06)3:2<67::aid-we29>3.0.co;2-2
Subject(s) - fetch , mesoscale meteorology , roughness length , surface roughness , wind speed , meteorology , environmental science , wind wave , thermal wind , wind profile power law , shore , stratification (seeds) , atmospheric sciences , geology , physics , oceanography , thermodynamics , seed dormancy , germination , botany , dormancy , biology
The equation for the dependence of the Charnock constant on wave age proposed by Johnson et al. (Journal of Physical Oceanography 1998; 28 : 1702 – 1716) is extended to include conditions of very young waves or short fetches. The effect on the simulated average wind speed and average wind power density off a straight east coast in Denmark is investigated by numerical simulations. Calculations are also performed employing the classical Charnock relation and a constant roughness of the sea. The formulations with variable sea surface roughness are combined with the equation for a smooth water surface for low winds. The wind climate is calculated with the Karlsruhe Atmospheric Mesoscale Model (KAMM) in 84 classes of the geostrophic wind. The difference between the fetch‐dependent and the fetch‐independent formulation is very small. Even a constant sea surface roughness yields good results near the coast. The influence of stratification, i.e. temperature differences between sea and land, is much more important than the fetch dependence of the sea surface roughness. Copyright © 2000 John Wiley & Sons, Ltd.