Comparison of three methods for determining strong wind stress over Lake Flevo |
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Authors: | J Wieringa |
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Institution: | 1. Royal Netherlands Meteorological Institute, De Bilt, The Netherlands
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Abstract: | The drag coefficient C d (10 m) at the center of shallow Lake Flevo (20-km diam) is evaluated for wind speeds u between 5 and 15 m s?1 independently by three methods. Trivane measurements of eddy-correlation fluxes agree with eddy flux data available for moderate wind speeds from other sites, and can together be represented by C d(10 m) = 0.0007 μ0.3. Additional evaluations of water-surface slope give C d(10 m) ≈ 0.0024, indicating that the stress at the water-surface level may not be entirely accounted for by eddy-correlation measurements well above the waves. Neither the eddy-correlation stress, nor the water-surface stress appears to be accurately estimable from profile measurements of wind, temperature and humidity analyzed without regard to sea state, if u > 10 m s?1. |
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