Survey report for the Danish North Sea, 2023: Geological screening for offshore wind farms, the Danish Energy Agency

Thomas Vangkilde-Pedersen, Lara F. Pérez, Niels Nørgaard-Pedersen, Luna H. Winther, Lars-Georg Rödel, Sigurd B. Andersen, Nicklas Christensen, Lis Allaart, Rasmus Ørnekoll Stenshøj, Lisbeth Lyngkjær Pedersen, Leonie Everding, Rasmus Andersen

Research output: Book/ReportReport (publicly available)

Abstract

GEUS has carried out fieldwork as part of a geological screening for offshore wind farms for the Danish Energy Agency (DEA) in 2023 in the Danish North Sea. The purpose of the survey was to acquire geophysical data, with particular focus on multichannel sparker seismic data, in regions with lack of data and geological information in order to establish a better basis for developing conceptual geological models and mapping geological units of importance for offshore wind farm development.

The survey, hereafter referred to as the ENS 2023 survey, started May 8 and was completed June 2. The ENS 2023 survey include most of the Danish North Sea. The activities were carried out using the survey vessel Arctic Ocean and involved three legs of geophysical mapping with single and multichannel seismic. Sub-bottom profiler, multibeam echo sounder and side scan sonar were obtained to support the seismic mapping.

Mobilization of the geophysical equipment took place in Esbjerg harbor from May 4 to May 7. The crew change between Leg 1 and Leg 2 took place in Hanstholm harbor between May 16 and May 18 due to weather standby. The crew change between Leg 2 and Leg 3 took place in Hirtshals harbor on May 24 and Thyborøn Harbor on May 25 due to weather standby. Demobilization after the survey took place in Hirtshals harbor on June 2. The survey plan for the ENS 2023 survey included 4400 km of survey lines in the Danish North Sea.

Leg 1 acquisition started off Blåvandshuk on May 8 and continued in the eastern, central and western Danish North Sea through May 15 in good weather conditions. A total of 1401 km of data were acquired along planned lines before Leg 1 ended with GEUS crew change in Hanstholm on May 16.

Leg 2 acquisition started on May 18 after two days of weather standby. A GAMS calibration of the positioning system and patch test of the EdgeTech multibeam echosounder were performed upon departure from Hanstholm. Subsequent data acquisition was focused on the central and western North Sea. Strong winds and high seas in the western part of the Danish North Sea forced a transit to Jammerbugt towards the end of the leg. A total of 780 km of geophysical data were acquired along planned lines during Leg 2 in good to very good weather conditions before a GEUS crew change in Hirtshals on May 24.

Leg 3 acquisition started in the eastern part of the Danish North Sea on May 26 after two days of weather standby and transit to Thyborøn and later to the survey area. The data acquisition was focused on the central and western North Sea until strong winds and high seas in the west again forced a transit to Jammerbugt towards the end of the leg. A total of 933 km of geophysical data were acquired along planned lines during Leg 3 in good to challenging weather conditions before the ENS 2023 survey was finished in Hirtshals on June 2.

A total of 3114 km of geophysical data were acquired along the planned survey lines (Figure 1) during the ENS 2023 survey. Details on the survey lines and transits are provided in the survey log included as Appendix A.
Original languageEnglish
PublisherGEUS
Number of pages30
Volume2023
DOIs
Publication statusPublished - 2 Aug 2023

Publication series

SeriesDanmarks og Grønlands Geologiske Undersøgelse Rapport
Number25
Volume2023

Keywords

  • Denmark

Programme Area

  • Programme Area 2: Water Resources

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