Concept
Sea surface swell wave mean period from variance spectral density second frequency moment
URI | http://vocab.nerc.ac.uk/standard_name/sea_surface_swell_wave_mean_period_from_variance_spectral_density_second_frequency_moment/ | ||
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Within Vocab | Climate and Forecast Standard Names | ||
Definition | The swell wave directional spectrum can be written as a five dimensional function S(t,x,y,f,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), f is frequency and theta is direction. S can be integrated over direction to give S1= integral(S dtheta). Frequency moments, M(n) of S1 can then be calculated as follows: M(n) = integral(S1 f^n df), where f^n is f to the power of n. The second wave period, T(m2), is calculated as the square root of the ratio M(0)/M(2). | ||
Date | None | ||
Note | accepted | ||
modified | 2008-04-15 14:00:00.0 | ||
Broad Match | P02:WVST |
Wave height and period statistics | |
P04 Global Change Master Directory Science Keywords V5 - (2) | |||
P64 Global Change Master Directory Science Keywords V6 - (2) | |||
Exact Match | http://mmisw.org/ont/cf/parameter/sea_surface_swell_wave_mean_period_from_variance_spectral_density_second_frequency_moment | ||
http://vocab.nerc.ac.uk/standard_name/sea_surface_swell_wave_mean_period_from_variance_spectral_density_second_frequency_moment/ | |||
P07:CFV8N72 |
sea_surface_swell_wave_mean_period_from_variance_spectral_density_second_frequency_moment | ||
Related | P06:UTBB |
Seconds |
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