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Response of a CALM Buoy Moored Vessel in Squall Condition

[+] Author Affiliations
Mark Paalvast, Jelte Kymmell

Mocean Offshore, Amsterdam, Netherlands

Ward Gorter

Shell Global Solutions International B.V., Rijswijk, Netherlands

Alison Brown

Shell Research Limited, Aberdeen, UK

Paper No. OMAE2016-54968, pp. V001T01A059; 9 pages
  • ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Geotechnics
  • Busan, South Korea, June 19–24, 2016
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4992-7
  • Copyright © 2016 by ASME


This paper reviews the response of a hawser moored vessel to squalls and addresses a novel method for obtaining statistically reliable design loads. Industry paradigms related to squall selection for analysis input are reviewed and renewed.

A benchmark database consisting of more than 15,000 unique squall-wave-current induced extreme values enables the validation of a range of less computationally demanding analysis and squall selection methods.

Extreme values are extrapolated to a design value using a Peak Over Threshold (POT) method to fit a Generalized Pareto Distribution (GPD). The influence of associated metocean conditions and squall characteristics on the vessel response is presented. By means of bootstrapping a satisfactory population size for design purposes is studied. The findings challenge common design practices currently employed throughout the industry.

Copyright © 2016 by ASME
Topics: Mooring , Vessels , Buoys



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