Directional dependence of extreme load parameters for offshore wind turbines

Research output: Contribution to book/conference proceedings/anthology/reportConference contributionContributedpeer-review



The correlation and direction dependence of extreme wind and wave load parameters with return periods of 50 or 100 years are hardly known. Existing approaches to determine these parameters are based on numerically simulated data or on combined data from different measurement locations. With the measurement platform FINO 1 synchronously measured time series of these parameters recorded over more than ten years in the German Bight are available for the first time. Measurement based investigations of the correlation and directional dependence of extreme load parameters are now possible. First evaluations indicate that extreme wind events often do not coincide with extreme sea state conditions. Direction dependencies of extreme wind speed and significant wave height were also detected. To analyze extreme rectified load effects the measurement data are subdivided into direction sectors. To extrapolate directionally dependent load parameters, different methods of extreme value analysis are used, taking different statistical population sizes into account. These directional extreme events are compared to each other and to extreme events without directional subdivision. As a result, ratio values of directionally dependent and independent extreme values of relevant load parameters are available. Thus, the influence of direction on the individual load parameters is quantified and the intensity of several rectified load effects can be estimated.


Original languageEnglish
Title of host publicationProceedings of the 25th International Ocean and Polar Engineering Conference, ISOPE 2015
PublisherInternational Society of Offshore and Polar Engineers
Number of pages8
ISBN (electronic)978-1-880653-89-0
Publication statusPublished - 2015

Publication series

SeriesProceedings of the International Offshore and Polar Engineering Conference


Title25th International Ocean and Polar Engineering Conference
Abbreviated titleISOPE 2015
Conference number25
Duration21 - 26 June 2015
CityKona, Big Island
CountryUnited States of America

External IDs

ORCID /0000-0001-8735-1345/work/142244609



  • Design wave, Direction dependence, Offshore wind energy, Rectified loads, Sea state statistics, Waves, Wind