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GLIN==> SEMINAR - Ann Arbor - January 14, 2004



Title:
NOAA GREAT LAKES SEMINAR SERIES
http://www.glerl.noaa.gov/news/seminars/

Date:
Wednesday, January 14, 2004

Time:
10:30 a.m.

Title:
"Observations of Steep Wave Statistics in Open Ocean Waters"

Speaker:
Dr. Nicholas Scott
Post Doctoral Scholar
Applied Ocean Physics and Engineering
Woods Hole Oceanographic Institution
Where:
GLERL Main Conference Room
2205 Commonwealth Blvd.
Ann Arbor, MI 48105
For directions:

    http://www.glerl.noaa.gov/facil/triptik.html


Abstract
A new wavelet analysis methodology is proposed to estimate the statistics of steep waves. The method is applied to open ocean wave height data from the Southern Ocean Waves Experiment (1992) and from a field experiment conducted at Duck, North Carolina (1997). Results show that high wave slope crests appear over a wide range of wave numbers, with a large amount being much shorter than the dominant wave. At low wave slope thresholds, all wave fields have roughly the same amount of wave crests regardless of wind forcing. The steep wave statistic decays exponentially with the square of the wave slope threshold, with a decay rate that is larger for the low wind cases than the high wind cases. Comparison of the steep wave statistic with independent measurements of the breaking wave statistic suggests a breaking wave slope threshold of about 0.12. Although the steep wave statistic roughly increases with the cube of the wind speed as the breaking wave statistic does, other factors besides the wind speed also affect the level of the steep wave statistic.  Comparison of the steep wave statistic to the saturation spectrum reveals a reasonable correlation at high wave slope thresholds.

For more information, contact:
Dr. Paul Liu
NOAA/GLERL
734-741-2294
Paul.C.Liu@noaa.gov





-- 
David F. Reid, Ph.D.
U.S. Department of Commerce
National Oceanic and Atmospheric Administration
Great Lakes Environmental Research Laboratory
2205 Commonwealth Blvd.
Ann Arbor, MI  48105-2945
Voice:	734-741-2019
FAX:	743-741-2055
GLERL home page:
   http://www.glerl.noaa.gov