Journal
OCEAN ENGINEERING
Volume 112, Issue -, Pages 307-319Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2015.12.018
Keywords
Inverse FORM; Principal component analysis; Environmental contours; Extreme sea state characterization
Funding
- U.S. Department of Energy's (DOE) Energy Efficiency and Renewable Energy (EERE) Offices Wind and Water Power Technologies Office
- Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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Environmental contours describing extreme sea states are generated as the input for numerical or physical model simulations as a part of the standard current practice for designing marine structures to survive extreme sea states. These environmental contours are characterized by combinations of significant wave height (H-s) and either energy period (T-e) or peak period (T-p) values calculated for a given recurrence interval using a set of data based on hindcast simulations or buoy observations over a sufficient period of record. The use of the inverse first-order reliability method (I-FORM) is a standard design practice for generating environmental contours. This paper develops enhanced methodologies for data analysis prior to the application of the I-FORM, including the use of principal component analysis (PCA) to create an uncorrelated representation of the variables under consideration as well as new distribution and parameter fitting techniques. These modifications better represent the measured data and, therefore, should contribute to the development of more realistic representations of environmental contours of extreme sea states for determining design loads for marine structures (C) 2015 Elsevier Ltd. All rights reserved.
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