Next Article in Journal
Assessing Embayed Equilibrium State, Beach Rotation and Environmental Forcing Influences; Tenby Southwest Wales, UK
Next Article in Special Issue
A Floating Ocean Energy Conversion Device and Numerical Study on Buoy Shape and Performance
Previous Article in Journal
Life under Climate Change Scenarios: Sea Urchins’ Cellular Mechanisms for Reproductive Success
Previous Article in Special Issue
Dynamically Scaled Model Experiment of a Mooring Cable
Article Menu

Export Article

Open AccessArticle
J. Mar. Sci. Eng. 2016, 4(2), 29;

On Peak Mooring Loads and the Influence of Environmental Conditions for Marine Energy Converters

INNOSEA, 1 rue de la Noë, CS 12102, Nantes 44321, France
CEMPS Renewable Energy, University of Exeter Cornwall Campus, Penryn TR10 9FE, UK
Author to whom correspondence should be addressed.
Academic Editor: Raúl Guanche García
Received: 26 February 2016 / Revised: 22 March 2016 / Accepted: 29 March 2016 / Published: 8 April 2016
(This article belongs to the Special Issue Ocean Wave Energy Conversion)
Full-Text   |   PDF [6377 KB, uploaded 8 April 2016]   |  


Mooring systems are among the most critical sub-systems for floating marine energy converters (MEC). In particular, the occurrence of peak mooring loads on MEC mooring systems must be carefully evaluated in order to ensure a robust and efficient mooring design. This understanding can be gained through long-term field test measurement campaigns, providing mooring and environmental data for a wide range of conditions. This paper draws on mooring tensions and environmental conditions that have been recorded (1) for several months during the demonstration of an MEC device and (2) over a period of 18 months at a mooring test facility. Both systems were installed in a shallow water depth (45 m and 30 m, respectively) using compliant multi-leg catenary mooring systems. A methodology has been developed to detect peak mooring loads and to relate them to the associated sea states for further investigation. Results indicate that peak mooring loads did not occur for the sea states on the external contour line of the measured sea states, but for the sea states inside the scatter diagram. This result is attributed to the short-term variability associated with the maximum mooring load for the given sea state parameters. During the identified sea states, MEC devices may not be in survival mode, and thus, the power take-off (PTO) and ancillary systems may be prone to damage. In addition, repeated high peak loads will significantly contribute to mooring line fatigue. Consequently, considering sea states inside the scatter diagram during the MEC mooring design potentially yields a more cost-effective mooring system. As such, the presented methodology contributes to the continuous development of specific MEC mooring systems. View Full-Text
Keywords: mooring system; peak mooring load; environmental condition; sea trial; field test; CALM buoy mooring system; peak mooring load; environmental condition; sea trial; field test; CALM buoy

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

Share & Cite This Article

MDPI and ACS Style

Harnois, V.; Thies, P.R.; Johanning, L. On Peak Mooring Loads and the Influence of Environmental Conditions for Marine Energy Converters. J. Mar. Sci. Eng. 2016, 4, 29.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
J. Mar. Sci. Eng. EISSN 2077-1312 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top