Geological Screening of Kriegers Flak Nord and South. Geological seabed screening in relation to possible location of windfarm areas. Client Danish Energy Agency

Publikation: Bog/rapportRapport (offentligt tilgængelig)

Abstrakt

The Danish Energy Agency has requested that GEUS undertakes a geological screening study of the Kriegers Flak North and South potential offshore wind farm (POWF) areas. The study has resulted in a general geological description and establishment of a conceptual geological model for the understanding of the area. The study is based on existing data and is to be used as a background for the evaluation of geological suitability of the areas as wind farm sites and a background for future interpretations of new seismic data, geotechnical in-vestigations, and an archaeological screening.

In this study we have used a combination of published work, GEUS archive seismic data and sediment core data to assess the general geological development of the southwestern Baltic Sea area, including the Kriegers Flak North and South POWF.

Information on the existing Kriegers Flak OWF has been presented including the general geology, soil types and geotechnical characteristics.

As part of the geological desk study, we present a relative late glacial and Holocene sea-level curve for the area and describe the development that is relevant for an archaeological screening.

The general geological description includes the complete geological succession from the underlying pre-Quaternary geological framework, the pre-Quaternary surface, glacial depos-its, the deglaciation and late glacial and Holocene deposits.

A surface sediment map has been compiled by a combination of Emodnet seabed substrate maps from the German and Swedish zones and the latest version (2020) of the Danish 1:100.000 seabed substrate map.

Details of the geology are presented from the Kriegers Flak North and South POWF areas and has been interpreted and described on the basis of existing knowledge, seismic profile sections modified from Baltic Pipe investigations and scientific seismic lines as well as vi-brocores.

In the south-western part of the Baltic Sea, studies of late glacial and early Holocene shore level changes have formed the basis for evaluation of the potential for finding submerged settlements in the wind farm areas. We consider the early and mid-Mesolithic time to be the most likely for findings.

It is concluded that it will be possible to establish a windfarm at Kriegers Flak 2 North POWF, due to its flat seabed (20 – 35m below present sea-level (bsl.) and thin-skinned Holocene sediments on top of till and Danian limestone.

It is concluded that the Kriegers Flak 2 South POWF is probably geotechnically suited for Wind- turbine foundations with some focal points.

It is however also recommended to acquire an open grid of shallow seismic data and few vibrocores, combined with geotechnical investigation, as a low-cost pre-investi-gation, before next step of decisions and comprehensive studies.

The geological setting and water depths above 20m indicates no risk for archaeologi-cal interest in both areas.
OriginalsprogEngelsk
UdgivelsesstedCopenhagen
ForlagGEUS
Rekvirerende organisationDanish Energy Authority (DEA)
Antal sider120
Vol/bind2022
DOI
StatusUdgivet - 26 apr. 2022

Publikationsserier

NavnDanmarks og Grønlands Geologiske Undersøgelse Rapport
ForlagGEUS
Nr.2
Vol/bind2022

Programområde

  • Programområde 4: Mineralske råstoffer

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