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Accession Number:
ADA278541
Title:
Storm Evolution of Directional Seas in Shallow Water
Corporate Author:
COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
Report Date:
1994-02-01
Abstract:
Measured storm wave frequency-direction spectra are presented to illustrate the evolution of wind wave energy distributions near times of high energy. Twenty-nine storm events, extracted from a 5-year database, are identified and described. Instrumentation consists of a nine-element linear array of bottom-mounted pressure gauges distributed along the 8-m isobath about 900 m offshore of Duck, NC, site of the Field Research Facility FRF of the U. S. Army Engineer Waterways Experiment Station, Coastal Engineering Research Center. Iterative Maximum Likelihood Estimation is used to determine directional distributions of wave energy. Events, identified by elevation and duration of wave energy, are due to both localized storms and long-period swell radiating from major weather events in the distant, deep Atlantic Ocean. Frequency- direction spectra associated with storms known as northeasters have a curiously recurrent pattern of broad directional distributions at low frequencies near the spectral peaks and distinct bimodal distributions over a broad range of high frequencies. Reasons for this behavior are not obvious but require clarification because such wave patterns do not conform to conventional models used in engineering design. The differences may lead to substantial variations in design results. Frequency-direction spectra, Wave climate, Storms, Wind waves.
Descriptive Note:
Final rept.
Pages:
0130
Distribution Statement:
Approved for public release; distribution is unlimited.
File Size:
5.03MB
