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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2020-102
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-102
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 Nov 2020

18 Nov 2020

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This preprint is currently under review for the journal WES.

Understanding and mitigating the impact of data gaps on offshore wind resource estimates

Julia Gottschall1 and Martin Dörenkämper2 Julia Gottschall and Martin Dörenkämper
  • 1Fraunhofer IWES, Am Seedeich 45, 27572 Bremerhaven, Germany
  • 2Fraunhofer IWES, Küpkersweg 70, 26129 Oldenburg, Germany

Abstract. Like almost all measurement datasets, wind energy siting data are subject to data gaps that can for instance originate from a failure of the measurement devices or data loggers. This is in particular true for offshore wind energy sites where the harsh climate can restrict the accessibility of the measurement platform, which can also lead to much longer gaps than onshore. In this study, we investigate the impact of data gaps and its mitigation by correlation and filling with mesoscale model data. Investigations are performed for three offshore sites in Europe, considering two years of parallel measurement data at the sites, and based on typical wind energy siting statistics. We find a mitigation of the data gaps' impact by a factor of ten on mean wind speed, direction and Weibull scale parameter, and a factor of three on Weibull shape parameter. With increasing gap length, the gaps' impact increases linearly for the overall measurement period while this behaviour is more complex when investigated in terms of seasons. This considerable reduction of the impact of the gaps found for the statistics of the measurement time series almost vanishes when considering long-term corrected data, for which we refer to 30 years of reanalysis data.

Julia Gottschall and Martin Dörenkämper

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Julia Gottschall and Martin Dörenkämper

Julia Gottschall and Martin Dörenkämper

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