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Offshore

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Dipl.-Phys. Jens Tambke
ForWind - Centre for Wind Energy Research
Institute of Physics - University of Oldenburg
D-26111 Oldenburg, Germany

Tel: +49 (0)441 - 3611 6736
Fax: +49 (0)441 - 3611 6739
e-mail: jens.tambkezs@fofousvrwkvzvfintjd.5jyqodefcuh

Offshore Meteorology

Overview

It is expected that an important part of the future expansion of wind energy utilisation at least in Europe will come from offshore sites. The first large offshore wind farms are currently in the planning phase in several countries in Europe. However, the economic viability of offshore wind farms depends on the favourable wind conditions compared to sites on land. The higher energy yield has to compensate the additional installation and maintenance cost. For project planning and siting, especially for large projects, a reliable prediction of the wind resource is therefore crucial.

Three main differences can be considered between wind conditions offshore and on land:

  • Compared to land surfaces the roughness of water is very low. This is the main reason for the favourable wind resource offshore. For modelling of the offshore wind climate it is therefore important to establish and refine models for the description of the sea surface roughness.

  • The atmospheric stability is the second parameter, which differs greatly between land and water areas. Its main influence is on the vertical momentum transport, which is reflected in the vertical wind speed profile.

  • A coastline represents a very pronounced roughness change, which gives rise to a pronounced internal boundary layer (IBL).

Our research is mainly concered with models for a better description of the sea surface roughness. In contrary to land conditions, the sea surface roughness depends on the wave field present, which in turn depends on the wind, distance to the shore, etc. Aim of this project is the development and validation of a relation for the estimation of the sea surface roughness, which can be used for offshore wind resource evaluation.

Project

 

  • Title: Investigation of wind-wave interaction for offshore wind power utilisation
  • Duration: 1999-2002
  • This research is undertaken in connection with the PhD project of Bernhard Lange.

Co-operations and Funding

The PhD project is a co-operation with the Risø National Laboratory, Denmark.

Additional co-operations:

Funding has been provided by the European Commission for the time period July 1998 - July 2000 as a Marie-Curie research training grant in the Training and Mobility of Researchers (TMR) program.

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