ENERGY LOSS IN SURFACE WAVE SPECTRA DUE TO DATA WINDOWING

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 8/3 (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 8/3 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. 8/3, correction of individual records is recommended.

• Supplemental Notes:
  • NATO furnished.
• Corporate Authors:

  SACLANT ASW Research Centre

  La Spezia,   Italy 
• Authors:
  • Briscoe, M G
• Publication Date: 1972-5-1

Media Info

• Pagination: 13 p.

Subject/Index Terms

• TRT Terms: Electromagnetic spectrum; Ocean waves; Stochastic processes; Technology; Wave measurement
• Subject Areas: Data and Information Technology; Design; Marine Transportation;

Filing Info

• Accession Number: 00035585
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SACLANTCEN-TM-177 Tech memo
• Files: TRIS
• Created Date: Oct 27 1972 12:00AM