The 2013 Dutch Energy Agreement initiated the country’s goal to increase its offshore wind capacity from 1,000MW to 4,500MW by 2023. The Government decided on three offshore wind farm zones for the deployment of the new offshore wind power: Borssele, Hollandse Kust (zuid) and Hollandse Kust (noord). To provide developers with high quality and certified metocean data, a digital database encompassing 38 years of metocean data was delivered. This sophisticated database will serve as a basis for the design, operation and maintenance of future offshore wind farms in the Netherlands.

Challenge

RVO.nl, on behalf of the Dutch Government (and supported by BLIX Consultancy BV) needed a way to provide developers with easy access to consistent, reliable and high quality metocean data.


Solution

Using state-of-the-art numerical models and advanced analysis methods, 38 years of metocean data at any given point within the defined project area was delivered in the form of a digital database.

Solution highlights (short) :

  • 38 years of modelling results in one solid database (including both time series and 2D spectral data)

  • Presents normal and extreme conditions at sea

  • User-friendly interface: an all-in-one approach

  • Results were validated against multiple measurements and proven to be of excellent quality

Results

Reduced cost

The database delivers all the required data, thus no further metocean studies are needed

High quality metocean data

The industry now has easy access to certified, high quality and consistent metocean data in the Dutch North Sea area

Future development support

The project supports cost-effective development of future offshore wind farms for the Netherlands


‘We challenged DHI to provide a world-class metocean database to allow developers to optimise their designs in the tender stage. DHI exceeded our expectations.’

Ben de Sonneville
Senior Consultant
BLIX Consultancy BV, on behalf of the client RVO.nl


The full story

Challenge

A need for consistent and reliable metocean data

High quality and reliable metocean data is fundamental to the success of any marine project such as design, operation and maintenance of offshore wind farms. Inconsistent and sometimes unreliable metocean data has resulted in a more costly design of various offshore wind farm projects in Europe.

The Dutch Government has taken a unique approach in providing developers with high quality metocean data. The new approach ensures access to consistent and reliable metocean data along the Dutch offshore wind farm concession areas, which can be easily accessible. RVO.nl (on behalf of the Dutch Government and supported by BLIX Consultancy BV) commissioned DHI (who has contributed to more than 85% of all offshore wind farm projects in Europe) to provide a comprehensive and user-friendly digital metocean database.



Solution

A digital metocean database

Using state-of-the-art numerical models and advanced analysis methods, 38 years of metocean data at any given point within parts of the Dutch North Sea area was delivered in the form of a digital database.

The database includes meteorology, hydrodynamics and waves; further pre-processed data such as extreme metocean conditions, joint-probabilities, associated parameters, tidal analysis fatigue data and spectral data.

DHI established dedicated high-resolution state-of-the-art numerical models (based on MIKE Powered by DHI software package) to provide metocean conditions in the Dutch North Sea area. The models were forced by wind/pressure field data from the Climate Forecast System Reanalysis (CFSR) dataset established by the National Centers for Environmental Prediction (NCEP).

An extensive validation of the modelling result was conducted using satellite and local measurements. The validation showed very good model performance and thus ensured accurate and high-quality metocean conditions at the desired areas.


Left: The North Atlantic regional model domain and bathymetry; Right: The database area (outer red line) shown together with Hollandse Kust (zuid) and Hollandse Kust (Noord) offshore wind farms. © DHI


Normal and extreme conditions at sea

Normal metocean conditions were described in detail and were based on the 38 years of modelling results. Extreme conditions were established for wind, current and water levels for return periods up to 100 years and for waves (significant wave height, maximum individual wave height and maximum crest heights) for return periods up to 10,000 years using advanced statistical methods. Joint probability of metocean conditions is also provided with this report. The results can be directly used for design purposes.


User-friendly interface: an all-in-one approach

Users can access the modelling data and the analysis results through a user-friendly interface.

A snapshot of the metocean database software containing +10 TB of data based on the MIKE OPERATIONS platform. © DHI


Various types of analysis (rose, scatter diagrams, occurrence tables, persistence, and so on) will be available concurrently through the database software which is based on MIKE OPERATIONS technology.



Results

Accurate and reliable metocean data

The digital database provides high quality, validated and comprehensive metocean data detailing normal and extreme conditions within the Dutch North Sea sector. It will help:

  • reduce cost by delivering all the required data for the developers for their initial cost estimates and final design – which means no further metocean studies are needed

  • develop the best possible metocean data basis suitable for design for the Dutch North Sea area

  • provide the industry with easy access to certified, high quality and consistent metocean data in Dutch North Sea area

  • support cost-effective development of future offshore wind farms for the Netherlands

The database and a comprehensive report describing the methodology used, are applicable for the design, maintenance and operation of offshore wind farms, inter-array cables, substations and their support structures. This will benefit companies submitting bids to develop projects in the Dutch sector of the North Sea.

The metocean report (in English) can be downloaded here: http://offshorewind.rvo.nl/windwaterzh.

About the client

BLIX Consultancy BV, on behalf of the client RVO.nl

BLIX Consultancy BV is an independent consultancy company of wind energy projects in the Netherlands. The Netherlands Enterprise Agency (RVO.nl) is responsible for the provision of site data for the Dutch wind farm zones. RVO.nl has increased its emphasis on providing more complete and high-quality site data compared to the process for the Borssele tenders. RVO.nl, supported by BLIX Consultancy, contracted DHI for the metocean study.


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