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
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.
Click here for the FORTRAN description.
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