Wave Spectra Revisited – New guidelines based on observations

Via Estrem, L. and Bunn, N. and Abernethy, R. and Burgess, K. (2017) Wave Spectra Revisited – New guidelines based on observations. In: ICE Coasts, Marine Structures and Breakwaters 2017, 5-7 September 2017, Liverpool, UK.

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Official URL: https://www.icevirtuallibrary.com/doi/abs/10.1680/...


Metocean studies often experience a lack of wave observation data at sites of interest. This leads to assumptions generally accommodated in maritime engineering but not necessarily accurate or correct. This is the case for the wave spectral shape and peakedness, often approximated to a standard JONSWAP spectrum with gamma (peakedness) of 3.3 (Hasselman et al., 1973) when no spectral data are available. This assumption leads to a set of spectral parameter ratios widely used in coastal engineering. Offshore peakedness variation however leads to different Tm02/Tp and Tm-1,0/Tp ratios (Goda, 2010). This paper presents the findings arising from the analysis of observed wave energy spectra at a number of offshore wave buoys, and compares the results against JONSWAP 1D (frequency) spectral profiles. Resulting averaged fitted gamma values at each location remain within a range between 1.4 and 2.5, lower than the standard 3.3. A Deviation Index (D.I.) proposed by Liu (1983) and Pires Silva (1988) to evaluate the goodness of spectral profile fits against observations is also discussed.

Item Type: Conference or Workshop Item (Paper)
Subjects: Maritime > General
Divisions: Maritime
Depositing User: Helen Stevenson
Date Deposited: 05 Jun 2020 13:27
Last Modified: 05 Jun 2020 13:27
URI: http://eprints.hrwallingford.com/id/eprint/1432

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