Deriving directional wave spectra from ship motions

Ian Angus Milne, Matthew Zed

Research output: Chapter in Book/Conference paperConference paperpeer-review


The ability to derive the directional wave spectra directly from the motions of a floating facility can be of significant value to offshore industry, particularly for sites where reliable observations are not available. This study employs new full-scale measurements of the dynamic motions of an operating drillship to evaluate the performance a parametric model to estimate the directional wave spectra at a swell dominated region. The drillship was dynamically positioned and operated at a constant draft which reduces the inherent uncertainties in the model. The model was applied to a range of interesting wave states, including multi-modal swells and the results were compared with estimates obtained independently from a numerical hindcast. It was found that generally favourable estimates of the wave spectral properties could be obtained at the site, particularly the mean wave direction and peak spectral period. The study, therefore, provides encouraging support for the use of drillships to acquire valuable metocean data for the offshore industry.
Original languageEnglish
Title of host publicationOffshore Technology Conference Asia 2018
Place of PublicationRichardson, Texas
PublisherOffshore Technology Conference
ISBN (Electronic)9781613995525
ISBN (Print)9781510862159
Publication statusPublished - 2018
EventOffshore Technology Conference Asia - Kuala Lumpur, Malaysia
Duration: 20 Mar 201823 Mar 2018


ConferenceOffshore Technology Conference Asia
CityKuala Lumpur


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