Energy Loss in Surface Wave Spectra Due to Data Windowing
SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)
Pagination or Media Count:
Windowing or tapering of surface-wave time-series is often performed prior to spectral analysis. The loss of variance due to the windowing is theoretically a factor of 83 for cosine windows, but this factor may vary in practice due to the non-white nature of wave spectra. A numerical experiment on 101 wave spectra has shown that although 83 is a good correction factor in the mean, corrections on individual records may vary from less than 2 to almost 4.3. Since rarely in geophysical studies are sufficient records available to allow one to approach some theoretical value in the mean, i.e. 83, correction of individual records is recommended.
- Physical and Dynamic Oceanography