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Title:
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Wave loads on offshore wind turbines: Feasibility study using results of wave experiments executed by Electricité de France (EDF)
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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1-4-2004
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ECN report number:
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Document type:
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ECN-C--04-042
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ECN publication
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Number of pages:
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Full text:
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25
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Download PDF
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Abstract:
Electricité
de France (EDF) has performed an experimental study on the wave loading
on a cylindrical pile for offshore wind turbines in shallow water depths.
A report with the results of the experimental study has been provided
to ECN.
The aim
of the feasibility study is to investigate whether the results of the
wave experiment can be used for further research and contribute to the
implementation of 6000 MW in the Dutch Exclusive Economic Zone by the
year 2020.
The study
is divided in three parts:
· a
literature survey
· a
visit to the hydraulic laboratory
· an
analysis of the experimental results
The results
of the experimental study at EDF are analyzed. The conditions of the
wave experiments are compared with conditions in the Dutch Exclusive
Economic Zone and correspond well. Wave breaking statistics in the southern
North Sea are discussed. Breaking
waves are negligible for water depths greater than 20 m.
EDF
also performed a numerical study on the wave loads. The wave loads are
calculated according to different wave theories using the Morison equation.
EDF compared the measured wave loads with the calculated wave loads.
For non-breaking waves, which are expected in Dutch offshore wind farms,
the wave loads can be calculated using the stream function wave theory.
For breaking waves and post breaking waves the wave loads are underestimated
using linear wave theory and stream function theory.
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