Concept
sea_surface_wave_mean_wavenumber_from_variance_spectral_density_first_wavenumber_moment
| URI | http://vocab.nerc.ac.uk/collection/P07/current/ZDRFFML2/1/ | ||
|---|---|---|---|
| Within Vocab | Climate and Forecast Standard Names | ||
| Alternative Labels | |||
| 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 mean wavenumber, k(1), is calculated as the ratio M(1)/M(0). | ||
| Date | 2021-09-20T14:41:46 | ||
| Identifier | SDN:P07::ZDRFFML2 | ||
| Note | accepted | ||
| Is Version Of | ZDRFFML2 | ||
| version | 1 | ||
| Same As | MMI | http://mmisw.org/ont/cf/parameter/sea_surface_wave_mean_wavenumber_from_variance_spectral_density_first_wavenumber_moment | |
| CF | http://vocab.nerc.ac.uk/standard_name/sea_surface_wave_mean_wavenumber_from_variance_spectral_density_first_wavenumber_moment/ | ||
| Related | P06:UPRM |
per metre | |
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