Directional spreading function based on the laboratory and field measurements by Donelan, Hamilton, and Hui (1985). Includes the high-frequency form for beta_s found by Banner (1990).
References:
Donelan, M. A., J. Hamilton, and W. H. Hui, 1985. Directional spectra of wind-generated waves. Phil. Trans. Royal Soc. London A., 315, 509-562.
Banner, M. L., 1990. Equilibrium spectra of wind waves. J. Phys. Oceanogr., 20, 966-984.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real(kind=rk), | intent(in) | :: | f | Frequency [Hz] |
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| real(kind=rk), | intent(in) | :: | wspd | Wind speed at 10 m height [m/s] |
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| real(kind=rk), | intent(in) | :: | fpeak | Peak frequency [Hz] |
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| real(kind=rk), | intent(in) | :: | theta | Wave direction [rad] |
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| real(kind=rk), | intent(in) | :: | theta_mean | Mean wave direction [rad] |
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