Concept
Sea surface wave mean wavelength from variance spectral density inverse wavenumber moment
| URI | http://vocab.nerc.ac.uk/standard_name/sea_surface_wave_mean_wavelength_from_variance_spectral_density_inverse_wavenumber_moment/ | ||
|---|---|---|---|
| Within Vocab | Climate and Forecast Standard Names | ||
| Definition | The wave directional spectrum can be written as a five dimensional function S(t,x,y,k,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), k is wavenumber and theta is direction. S has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density. Wavenumber is the number of oscillations of a wave per unit distance. Wavenumber moments, M(n) of S1 can then be calculated as follows: M(n) = integral(S1 k^n dk), where k^n is k to the power of n. The inverse wave wavenumber, k(m-1), is calculated as the ratio M(-1)/M(0). The wavelength is the horizontal distance between repeated features on the waveform such as crests, troughs or upward passes through the mean level. | ||
| Date | None | ||
| Note | accepted | ||
| modified | 2023-02-06 17:17:13.0 | ||
| Exact Match | http://mmisw.org/ont/cf/parameter/sea_surface_wave_mean_wavelength_from_variance_spectral_density_inverse_wavenumber_moment | ||
| http://vocab.nerc.ac.uk/standard_name/sea_surface_wave_mean_wavelength_from_variance_spectral_density_inverse_wavenumber_moment/ | |||
P07:05YLQ0LQ |
sea_surface_wave_mean_wavelength_from_variance_spectral_density_inverse_wavenumber_moment | ||
| Related | P06:ULAA |
Metres | |
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