DELILAH Wind Wave Directional Spectra

In the tables below are links to the data. There is one data file for each spectrum. Files are named for their data collection start times, in the form yymmddhhmm.asc, where yymmddhhmm is (2-digit) year, month, day, hour, and minute (Eastern Standard Time). Each file is about 30 kbytes in length. Also available are files containing FORTRAN formats and descriptions for reading the ASCII files.

All results are based on 8192-sec (2 hr 16 min 32 sec) time series of data collected at 2 Hz or, rarely, 4 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 and a maximum of 30 iterations.

Questions or problems should be addressed to Dr. Charles Long: phone (252)261-3511, FAX (252)261-4432, e-mail:longc@wes.army.mil

The 8M Array

Directions depicted in frequency-direction spectra from the FRF 8-m array represent azimuths from which waves arrive in degrees counterclockwise from normal to the array, or from parallel to the FRF pier, or, approximately, from shore normal. Zero degrees represents waves propagating straight onshore, having wavenumber vectors aligned with the pier, and wave crests perpendicular to the pier. A direction of +45 degrees indicates waves coming from the northeastward side of the pier, and propagating along an azimuth 45 degrees to the left of the pier axis for an observer looking seaward. An angle of +90 degrees represents the (rather uncommon) condition of waves propagating straight down the coast from northish to southish. Negative angles represent waves from the southeastward side of the pier. Waves at -45 degrees propagate onshore and northward along an azimuth 45 degrees to the right of the pier axis for an observer looking seaward.

Alternatively, but equivalently, a depicted angle is the conventional trigonometric direction of a wavenumber vector for wave equations cast in a right-hand Cartesian coordinate system with horizontal x-axis aligned with the FRF pier and increasing landward, horizontal y-axis normal to the pier and increasing southward, and z-axis positive upward. In this system, wavenumber vector direction originates along the positive x-axis and increases counterclockwise when viewed from above.

A description of the FRF 8M Array is given by Long and Oltman-Shay (1991, "Directional characteristics of waves in shallow water," Technical Report CERC-91-1, US Army Engineer Waterways Experiment Station, Vicksburg, MS), and details of data analysis are given by Long and Atmadja (1994, "Index and bulk parameters for frequency-direction spectra measured at CERC Field Research Facility, September 1990 to August 1991,", Miscellaneous Paper CERC-94-5, US Army Engineer Waterways Experiment Station, Vicksburg, MS).

Click here for the FORTRAN description.

8m Array Data
LA9010020100.ASC020100.gif
LA9010020400.ASC020400.gif
LA9010020700.ASC020700.gif
LA9010021000.ASC021000.gif
LA9010021300.ASC021300.gif
LA9010021600.ASC021600.gif
LA9010021900.ASC021900.gif
LA9010022200.ASC022200.gif
LA9010030100.ASC030100.gif
LA9010030400.ASC030400.gif
LA9010030700.ASC030700.gif
LA9010031000.ASC031000.gif
LA9010031300.ASC031300.gif
LA9010031600.ASC031600.gif
LA9010032200.ASC032200.gif
LA9010040100.ASC040100.gif
LA9010040400.ASC040400.gif
LA9010040700.ASC040700.gif
LA9010041000.ASC041000.gif
LA9010041600.ASC041600.gif
LA9010041900.ASC041900.gif
LA9010042200.ASC042200.gif
LA9010050100.ASC050100.gif
LA9010050400.ASC050400.gif
LA9010050700.ASC050700.gif
LA9010051000.ASC051000.gif
LA9010051300.ASC051300.gif
LA9010051600.ASC051600.gif
LA9010051900.ASC051900.gif
LA9010052200.ASC052200.gif
LA9010060100.ASC060100.gif
LA9010060400.ASC060400.gif
LA9010060700.ASC060700.gif
LA9010061000.ASC061000.gif
LA9010061300.ASC061300.gif
LA9010061600.ASC061600.gif
LA9010061900.ASC061900.gif
LA9010062200.ASC062200.gif
LA9010070100.ASC070100.gif
LA9010070400.ASC070400.gif
LA9010070700.ASC070700.gif
LA9010071000.ASC071000.gif
LA9010071300.ASC071300.gif
LA9010071600.ASC071600.gif
LA9010071900.ASC071900.gif
LA9010072200.ASC072200.gif
LA9010080100.ASC080100.gif
LA9010080400.ASC080400.gif
LA9010080700.ASC080700.gif
LA9010081000.ASC081000.gif
LA9010081300.ASC081300.gif
LA9010081600.ASC081600.gif
LA9010081900.ASC081900.gif
LA9010082200.ASC082200.gif
LA9010090100.ASC090100.gif
LA9010090400.ASC090400.gif
LA9010090700.ASC090700.gif
LA9010091000.ASC091000.gif
LA9010091300.ASC091300.gif
LA9010091600.ASC091600.gif
LA9010091900.ASC091900.gif
LA9010092200.ASC092200.gif
LA9010100100.ASC100100.gif
LA9010100400.ASC100400.gif
LA9010100700.ASC100700.gif
LA9010101000.ASC101000.gif
LA9010101300.ASC101300.gif
LA9010101600.ASC101600.gif
LA9010101900.ASC101900.gif
LA9010102200.ASC102200.gif
LA9010110100.ASC110100.gif
LA9010110400.ASC110400.gif
LA9010110700.ASC110700.gif
LA9010111000.ASC111000.gif
LA9010111300.ASC111300.gif
LA9010111600.ASC111600.gif
LA9010111900.ASC111900.gif
LA9010112200.ASC112200.gif
LA9010120100.ASC120100.gif
LA9010120400.ASC120400.gif
LA9010120700.ASC120700.gif
LA9010121000.ASC121000.gif
LA9010121300.ASC121300.gif
LA9010121600.ASC121600.gif
LA9010121900.ASC121900.gif
LA9010122200.ASC122200.gif
LA9010130100.ASC130100.gif
LA9010130400.ASC130400.gif
LA9010130700.ASC130700.gif
LA9010131000.ASC131000.gif
LA9010131300.ASC131300.gif
LA9010131600.ASC131600.gif
LA9010131900.ASC131900.gif
LA9010132200.ASC132200.gif
LA9010140100.ASC140100.gif
LA9010140400.ASC140400.gif
LA9010140700.ASC140700.gif
LA9010141000.ASC141000.gif
LA9010141300.ASC141300.gif
LA9010141600.ASC141600.gif
LA9010141900.ASC141900.gif
LA9010142200.ASC142200.gif
LA9010150400.ASC150400.gif
LA9010150700.ASC150700.gif
LA9010151000.ASC151000.gif
LA9010151300.ASC151300.gif
LA9010151600.ASC151600.gif
LA9010151900.ASC151900.gif
LA9010152200.ASC152200.gif
LA9010160100.ASC160100.gif
LA9010160400.ASC160400.gif
LA9010160700.ASC160700.gif
LA9010161000.ASC161000.gif
LA9010161300.ASC161300.gif
LA9010161600.ASC161600.gif
LA9010161900.ASC161900.gif
LA9010162200.ASC162200.gif
LA9010170100.ASC170100.gif
LA9010170400.ASC170400.gif
LA9010170700.ASC170700.gif
LA9010171000.ASC171000.gif
LA9010171300.ASC171300.gif
LA9010171600.ASC171600.gif
LA9010171900.ASC171900.gif
LA9010172200.ASC172200.gif
LA9010180100.ASC180100.gif
LA9010180400.ASC180400.gif
LA9010180700.ASC180700.gif
LA9010181000.ASC181000.gif
LA9010181300.ASC181300.gif
LA9010181600.ASC181600.gif
LA9010181900.ASC181900.gif
LA9010182200.ASC182200.gif
LA9010190100.ASC190100.gif
LA9010190400.ASC190400.gif
LA9010190700.ASC190700.gif
LA9010191000.ASC191000.gif
LA9010191300.ASC191300.gif
LA9010191600.ASC191600.gif
LA9010191900.ASC191900.gif
LA9010192200.ASC192200.gif
LA9010200100.ASC200100.gif
LA9010200400.ASC200400.gif
LA9010200700.ASC200700.gif
LA9010201000.ASC201000.gif
LA9010201300.ASC201300.gif
LA9010201600.ASC201600.gif
LA9010201900.ASC201900.gif
LA9010202200.ASC202200.gif
LA9010210100.ASC210100.gif
LA9010210400.ASC210400.gif
LA9010210700.ASC210700.gif
LA9010211000.ASC211000.gif
LA9010211300.ASC211300.gif
LA9010211600.ASC211600.gif
LA9010211900.ASC211900.gif
LA9010212200.ASC212200.gif

Crest and Trough Subarrays

These spectra were obtained from the "pressure-gauge-plus-five-current-meter" arrays. 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.

Click here for the FORTRAN description.

Crest Data
DC9010030700.ASCC030700.gif
DC9010031000.ASCC031000.gif
DC9010031557.ASCC031557.gif
DC9010031856.ASCC031856.gif
DC9010040103.ASCC040103.gif
DC9010041902.ASCC041902.gif
DC9010050659.ASCC050659.gif
DC9010050959.ASCC050959.gif
DC9010051558.ASCC051558.gif
DC9010051857.ASCC051857.gif
DC9010052206.ASCC052206.gif
DC9010060659.ASCC060659.gif
DC9010061600.ASCC061600.gif
DC9010061859.ASCC061859.gif
DC9010070358.ASCC070358.gif
DC9010070702.ASCC070702.gif
DC9010071001.ASCC071001.gif
DC9010071604.ASCC071604.gif
DC9010072201.ASCC072201.gif
DC9010080400.ASCC080400.gif
DC9010080658.ASCC080658.gif
DC9010080957.ASCC080957.gif
DC9010081304.ASCC081304.gif
DC9010091002.ASCC091002.gif
DC9010100104.ASCC100104.gif
DC9010100956.ASCC100956.gif
DC9010120057.ASCC120057.gif
DC9010120356.ASCC120356.gif
DC9010121004.ASCC121004.gif
DC9010121303.ASCC121303.gif
DC9010130058.ASCC130058.gif
DC9010130357.ASCC130357.gif
DC9010141604.ASCC141604.gif
DC9010141903.ASCC141903.gif
DC9010150103.ASCC150103.gif
DC9010150402.ASCC150402.gif
DC9010151001.ASCC151001.gif
DC9010151603.ASCC151603.gif
DC9010152205.ASCC152205.gif
DC9010160056.ASCC160056.gif
DC9010160404.ASCC160404.gif
DC9010161302.ASCC161302.gif
DC9010162158.ASCC162158.gif
DC9010170057.ASCC170057.gif
DC9010170356.ASCC170356.gif
DC9010170705.ASCC170705.gif
DC9010171004.ASCC171004.gif
DC9010171303.ASCC171303.gif
DC9010171600.ASCC171600.gif
DC9010172156.ASCC172156.gif
DC9010180104.ASCC180104.gif
DC9010180659.ASCC180659.gif
DC9010181600.ASCC181600.gif
DC9010181859.ASCC181859.gif
DC9010190401.ASCC190401.gif
DC9010190701.ASCC190701.gif
DC9010191000.ASCC191000.gif
DC9010191602.ASCC191602.gif
DC9010192200.ASCC192200.gif
DC9010200100.ASCC200100.gif
DC9010200359.ASCC200359.gif
DC9010200657.ASCC200657.gif
DC9010200956.ASCC200956.gif
DC9010201901.ASCC201901.gif
DC9010202156.ASCC202156.gif
DC9010210403.ASCC210403.gif
DC9010210701.ASCC210701.gif

Trough Data
DT9010031557.ASCT031557.gif
DT9010031856.ASCT031856.gif
DT9010041902.ASCT041902.gif
DT9010050659.ASCT050659.gif
DT9010050959.ASCT050959.gif
DT9010051558.ASCT051558.gif
DT9010051857.ASCT051857.gif
DT9010060659.ASCT060659.gif
DT9010061600.ASCT061600.gif
DT9010061859.ASCT061859.gif
DT9010070702.ASCT070702.gif
DT9010071001.ASCT071001.gif
DT9010071604.ASCT071604.gif
DT9010072201.ASCT072201.gif
DT9010080658.ASCT080658.gif
DT9010080957.ASCT080957.gif
DT9010081304.ASCT081304.gif
DT9010091002.ASCT091002.gif
DT9010100104.ASCT100104.gif
DT9010100403.ASCT100403.gif
DT9010100956.ASCT100956.gif
DT9010141004.ASCT141004.gif
DT9010141604.ASCT141604.gif
DT9010141903.ASCT141903.gif
DT9010142203.ASCT142203.gif
DT9010150103.ASCT150103.gif
DT9010150402.ASCT150402.gif
DT9010151001.ASCT151001.gif
DT9010151603.ASCT151603.gif


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