The effect of directionality on extreme wave design criteria

Jonathan, P. and Ewans, K. (2007) The effect of directionality on extreme wave design criteria. Ocean Engineering, 34 (14-15). pp. 1977-1994. ISSN 0029-8018

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Abstract

Sea state design criteria for offshore facilities are frequently provided by direction. For example, it is typical for return-period values of the significant wave height to be specified for each of eight 45° sectors in addition to the omni-directional case. However, it is important that these criteria be consistent so that the probability of exceedance of a given wave height from any direction derived from the directional values is the same as for the omni-directional value. As recently demonstrated by Forristall it is not sufficient simply to scale the directional values so that the value of the wave height from the most severe sector is the same as the omni-directional value. We develop an approach for establishing appropriate directional criteria and an associated omni-directional criterion for a specific location. The inherent directionality of sea states is used to develop a model for the directional dependence of distributions of storm maxima. The directional model is applied to the GOMOS data, and the distributional properties of the 100-year significant wave height are estimated and the implications for design discussed. An objective risk-cost approach is proposed for optimising directional criteria, while preserving overall reliability. Simulation studies are performed, using realistic extreme value assumptions, to quantify the uncertainties. © 2007 Elsevier Ltd. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Ocean Engineering
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2212
Subjects:
?? designextremegulf of mexicohurricaneriskwave directionwave heightextreme wave design crieriaoffshore facilitiescomputer simulationmathematical modelsprobabilityreliability theoryseawaterwater wavessea statesignificant wave heightstorm surgewave directionw ??
ID Code:
133068
Deposited By:
Deposited On:
22 Apr 2019 11:20
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2024 19:20