Skip to main content

Research Repository

Advanced Search

SPOWTT: Improving the Safety and Productivity of Offshore Wind Technician Transit

Earle, Fiona; Huddlestone, Jon; Williams, Terry; Stock-Williams, Clym; van der Mijle-Meijer, Harald; de Vries, Linda; van Heemst, Hans; Hoogerwerf, Erwin; Koomen, Lenard; de Ridder, Erik Jan; Serraris, Jorrit Jan; Struijk, Gijs; Stormonth-Darling, Andrew; Cline, Jon; Jenkins, Mark; dos Santos, Joana Godinho; Coates, Ian; Corrie, Andrew; Moore, George


Jon Huddlestone

Clym Stock-Williams

Harald van der Mijle-Meijer

Linda de Vries

Hans van Heemst

Erwin Hoogerwerf

Lenard Koomen

Erik Jan de Ridder

Jorrit Jan Serraris

Gijs Struijk

Andrew Stormonth-Darling

Jon Cline

Mark Jenkins

Joana Godinho dos Santos

Ian Coates

Andrew Corrie

George Moore


This paper describes the SPOWTT project. The intention of this project was to understand how sailing by crew transfer vessel (CTVs) to offshore wind farms affects the mental and physical wellbeing of individuals on board. The focus was on quantifying this impact, understanding the key drivers, with an aim to ensuring personnel can arrive to the wind turbines in a fit state to work safely and effectively. Impacts looked at subjective state beyond simply vomiting. Key results include the ability now to predict vessel motions from given Metocean conditions and vessel designs. We also discovered that the impact of vessel motions on seasickness is different for different symptoms and is driven not only by vertical z-axis accelerations but also by certain frequencies of motion in the y-axis. Frequencies other than 0.16 Hz were found to be impactful, and x-axis movements appeared to have a longer-lasting effect on the day's work. Through the formulation of a new, evidence-based understanding of seasickness, we have created an operational planning tool, designed to have a direct benefit on the safety and productivity of offshore wind farm operations.


Earle, F., Huddlestone, J., Williams, T., Stock-Williams, C., van der Mijle-Meijer, H., de Vries, L., …Moore, G. (in press). SPOWTT: Improving the Safety and Productivity of Offshore Wind Technician Transit. Wind energy,

Journal Article Type Article
Acceptance Date Apr 30, 2021
Online Publication Date May 11, 2021
Deposit Date May 2, 2021
Publicly Available Date May 19, 2021
Journal Wind Energy
Print ISSN 1095-4244
Electronic ISSN 1099-1824
Publisher Wiley
Peer Reviewed Peer Reviewed
Keywords Human factors; Offshore wind farm; Operations and maintenance; Sea-sickness
Public URL


Published article (4.6 Mb)

Publisher Licence URL

Copyright Statement
© 2021 The Authors. Wind Energy published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

You might also like

Downloadable Citations