Delilah Wind Wave Directional Spectra from Crest and Trough subarrays

This directory has ASCII files of wind wave frequency-direction spectra obtained from pressure-gauge-plus-five-current-meter arrays deployed during the DELILAH experiment (October 1990). Dr. Ed Thornton of the Naval Postgraduate School, Monterrey, CA, and Dr. Bob Guza of Scripps Institution of Oceanography, La Jolla, CA, obtained the raw data, and are thanked for sharing.

There is one data file for each spectrum. Files are named for their data collection start times, in the form dcyymmddhhmm.ASC (crest array) or dtyymmddhhmm.ASC> (trough array), where yymmddhhmm is (2-digit) year, month, day, hour, and minute (Eastern Standard Time). Each file is about 60 kbytes in length. A file called readdelilahf contains (FORTRAN) formats for reading the ASCII files, and has a header that identifies all the file variables, units, and dimensions.

All results are based on 8192-sec (2 hr 16 min 32 sec) time series of data collected at 8 Hz. The basic analysis algorithm is the iterative maximum likelihood estimator derived and described by Pawka (1983, "Island shadows in wave directional spectra," J. Geophys. Res., 88, p. 2579), using his recommended convergence parameters, a maximum of 30 iterations, and adapted by the FRF for use with the sensor set listed above.

Details of analysis can be obtained from, and questions or problems should be addressed to Chuck Long: phone (252) 261-3511, FAX (252) 261-4432, e-mail longc@wes.army.mil

Crest Data
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Trough Data
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