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Conference programme 

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Poster session

Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
Patrick Dich Grode DHI, Denmark
Co-authors:
Patrick Dich Grode (1) F P Hans Fabricius Hansen (1) Henrik Kofoed-Hansen (1) Palle Martin Jensen (1) Martin Taaning (1) Niels Jacob Tarp-Johansen (2)
(1) DHI, Hørsholm, Denmark (2) DONG Energy Wind Power A/S, Gentofte, Denmark

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Poster
Download poster(2.20 MB)

Presenter's biography

Biographies are supplied directly by presenters at OFFSHORE 2015 and are published here unedited

Mr. Grode has more than 10 years professional experience in the field of offshore and coastal engineering with emphasis on metocean processes, data and analysis. Mr. Grode has been involved in many complex offshore wind projects on establishment of accurate and robust metocean data for design, installation and O&M, and constantly strives to innovate past practice for the benefit of the entire industry.

Abstract

Dong energy regional metocean atlas - fast-track provision of meteorological, oceanographic and wave data for development, design and planning of offshore wind farms

Introduction

For optimizing the design of offshore wind farms it becomes increasingly important to have accurate and complete metocean data for establishment of a design basis. Quite often the provided metocean data are just valid for one location or a small geographical area. Further it takes in the order of 1+ year from kick-off on a local hindcast model to certified design basis is available. This paper presents a service that DHI has conducted for DONG Energy to fast-track the establishment of certified metocean design bases for sites in the Northern Europe. The target is 4 month from kick-off to certification.


Approach

Being at an early stage prior to kick-off of metocean studies able to provide reasonable good first estimates of metocean conditions for design and installation/O&M de-risks the planning and budgeting significantly. Various standards provide estimates of extreme conditions, but do not cover coastal regions to the degree of detail needed to make reliable first estimates. Further, operational conditions are hardly covered. To meet the demands for timely delivery DHI developed a metocean model to the level of detail of a regional model covering Northern Europe. This has been delivered in the form of a GIS database.

Main body of abstract

Results and Novelty: Among the merits of this regional wave atlas, and the process to develop it are the following:
• Establishment of accurate long-term wind, wave and hydrodynamic conditions in coastal / near shore areas supporting early stage assessments at virtually any offshore position in the Northern Europe
• As a novelty a data base with a GIS interface allows extraction of metocean data and some basic analyses from any point within the model’s geographical coverage in few minutes
• 2D spectral data is stored to allow fast-track local modelling to take-off with the regional wave atlas as boundary conditions. Modelled 2D spectra have been validated against site measurements
• An extensive data set of more than 100 stations have been used for calibration/validation
• The new CFSR wind data by NCEP has been used and proved applicable
• Satellite data have served for additional validation
• Extreme values derived from the 30-yrs long data set compares well with existing extreme value maps for truly offshore sites
• The certifier DNV-GL has actively been involved during the development process


Conclusion

This paper demonstrates capabilities, new developments as mentioned above and is a show case for streamlining the development process for offshore wind farm design.


Learning objectives
Tools for integrated met-ocean design of offshore wind turbines