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Comparative Analysis of Environmental Contour Approaches to Estimating Extreme Waves for Offshore Installations for the Baltic Sea and the North Sea

Wrang, Linus and Katsidoniotaki, Eirini and Nilsson, Erik and Rutgersson, Anna and Rydén, Jesper and Göteman, Malin (2021). Comparative Analysis of Environmental Contour Approaches to Estimating Extreme Waves for Offshore Installations for the Baltic Sea and the North Sea. Journal of Marine Science and Engineering. 9 , 96
[Research article]

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Abstract

At the stage of design load analysis for offshore installations such as wave energy systems, a critical step is the determination of environmental cases to be evaluated for the definition of the characteristic design load. A commonly used methodology for load case selection, applied in multiple studies and recommended by technical specifications and guidelines, is the environmental contour approach. Here, 50-year environmental contours were generated for four study sites located in the North Sea, Skagerrak and the Baltic Sea by considering both observations and hindcast (model) data. For the construction of the contours, the well-established inverse first-order method (I-FORM) and a modified version using principal component analysis (PCA) were both examined. Furthermore, a 2-dimensional peaks-over-threshold (2D POT) method was evaluated. It was found that a version of the regular I-FORM was able to produce satisfactory contours which properly accounted for the highest waves. When using PCA, the dependency in the data was not properly captured by the probability functions under consideration. The 2D POT method, where applicable, was found to underestimate the extreme sea states. Comparisons between contours obtained from observations and hindcast data showed that the contours may differ substantially depending on the site and method, and thus care must be exercised when using hindcast data for such purposes.

Authors/Creators:Wrang, Linus and Katsidoniotaki, Eirini and Nilsson, Erik and Rutgersson, Anna and Rydén, Jesper and Göteman, Malin
Title:Comparative Analysis of Environmental Contour Approaches to Estimating Extreme Waves for Offshore Installations for the Baltic Sea and the North Sea
Series Name/Journal:Journal of Marine Science and Engineering
Year of publishing :2021
Volume:9
Article number:96
Number of Pages:24
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Ocean and River Engineering
Keywords:WEC design, wave hindcast, Baltic Sea, North Sea, environmental contours, peaks-over-threshold
URN:NBN:urn:nbn:se:slu:epsilon-p-110081
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-110081
Additional ID:
Type of IDID
DOI10.3390/jmse9010096
Web of Science (WoS)000610327300001
ID Code:22745
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: SLUpub Connector
Deposited On:11 Mar 2021 14:04
Metadata Last Modified:11 Mar 2021 14:11

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