PARAMETERIZATION OF DIRECTIONAL SPECTRA

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Authors
  1. Juszko, B-A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Juszko Scientific Services, Victoria BC (CAN)
Abstract
High-resolution directional wave spectra, obtained from a WAVEC buoy moored on the Grand Banks in 1984, were modelled using various directional parameterizations. Consistent with most approaches in the literature, a two-part parameterization was attempted. Initially, the Ochi and Hubble (1976) six-parameter amplitude model (OH model) was fitted to the data amplitude spectrum. Parameterization of the directional component was then examined using a basic two-parameter cosine-power model upon which various limitations on the parameters were introduced. The model was assessed by its ability to reproduce the data spectrum based on a least-squares residual statistic. A 10-parameter model, for which the amplitude and direction parameters were fitted simultaneously, was then developed as an extension to the OH model. It was shown to outperform any equivalent, two-part parameterization and could acceptably reproduce over 90% of the data records.
Report Number
DREA-CR-89-414 — Contractor Report
Date of publication
15 Mar 1989
Number of Pages
152
DSTKIM No
89-03380
CANDIS No
61281
Format(s):
Hardcopy;Originator's fiche received by DSIS;Electronic Document(PDF)

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