Geological Screening for Offshore Wind - Ice above sediments

Dette datasæt udstiller tykkelseskort over Holocæne og senglaciale aflejringer i danske havområder. Kortene er udarbejdet af GEUS i samarbejde med NIRAS og Miljøstyrelsen som led i Energistyrelsens geologiske screening for storskala havvind. Formålet med datasættet er at give et detaljeret geologisk grundlag, der kan understøtte planlægningen af havvindprojekter i Danmark. De udstillede kort viser variationer i aflejringernes tykkelse og udgør en central reference i NIRAS’ følsomhedsstudie, som vurderer havområders egnethed til etablering af vindenergi. Datasættet præsenteres gennem en dedikeret GEUS-webportal og indgår som et officielt GEUS-produkt. Portalen fungerer både som udstillingsvindue for de endelige geologiske data og som et fagligt referencepunkt i forbindelse med NIRAS’ digitale rapportering.

Tykkelsen af de kvartære aflejringer i Danmark er beregnet som forskellen mellem terræn (KMS - højdemodel 2008) og toppen af den prækvartære periode (GEUS - prækvartær højdeforhold). ENGLISH The thickness of the Quaternary deposits in Denmark is calculated as the difference between terrain (KMS - height model 2008) and the top of the pre-Quaternary (GEUS - pre-Quaternary height ratio).

Havbundssedimentkortet, der er opdateret i 2020, viser den geografiske fordeling af havbundssedimenterne i de danske farvande. Den givne sedimentklassificering repræsenterer den primære sedimenttype i de øverste 0,5 m af havbunden. Hver sedimentklasse er defineret ud fra den specifikke kornstørrelsesfordeling. Morænel er dog et blandet sediment af ler, sand og grus, og sedimentære bjergarter udtrykker tilstedeværelsen af aflejringer med en alder på flere millioner år og forskellig historie. På grund af den ujævne datafordeling er klassificeringerne baseret på interpolationer mellem datapunkter sammen med kendskab til den geologiske historie, vanddybder og havbundens morfologi. Derudover er tilgængelig biologisk information (fordeling af alger, ålegræs, muslingebanker osv.) inkluderet som baggrundsinformation. The Seabed sediment map, which is updated in 2020, shows the spatial distribution of the seabed sediments in the Danish waters. The given sediment classification represents the major sediment type of the upper 0.5 m of the seabed. Each sediment class is defined based on the specific grain size distribution. However, till is a mixed sediment of clay, sand and gravel, and sedimentary rocks express the presence of deposits with an age of several million years and different histories. Due to the uneven data distribution, the classifications are based on interpolations between data points together with the knowledge of the geological history the water depths and seabed morphology. Furthermore, available biological information (distribution of algae, eelgrass, mussel beds etc.) has been included as background information.

This dataset represents a nationwide digital geological map of superficial deposits in Denmark at a scale of 1:200.000. The map shows the classification and distribution of near-surface deposits, primarily glacial and post-glacial sediments. The dataset is based on the Digital Soil and Sediment Map of Denmark at 1:25.000 in areas where detailed mapping is available. In other areas, the distribution of deposits has been interpreted based on borehole data, landscape analysis and other available geological information. The deposits are classified into 12 generalised types, making the dataset a simplified and generalised version of the detailed 1:25.000 map. The dataset provides a national overview of superficial deposits and serves as a reference for regional and national applications. Official metadata Purpose The purpose of the dataset is to provide a consistent, nationwide digital map of superficial deposits in Denmark. The map is used as a basis for geological interpretation, environmental management, land-use planning, resource assessment, as well as education and research. Supplemental Information The dataset is an interpretation-based national map product and is not subject to continuous updates. It represents a generalised overview of the distribution of superficial deposits at the ground surface and should be used in conjunction with more detailed maps and local data where higher spatial resolution or detailed stratigraphic information is required. Lineage The dataset was compiled by the Geological Survey of Denmark and Greenland (GEUS) and represents version 2 of the digital superficial deposits map at a scale of 1:200.000. The map is based on the compilation and harmonisation of existing geological maps, borehole data, geomorphological analyses and previous Quaternary geological investigations. Version 2 includes updates and improvements compared to earlier versions, including revised deposit boundaries and classifications based on new knowledge and quality assurance. During compilation of the dataset, generalisation and adjustments have been applied in certain areas, resulting in a spatial uncertainty of up to approximately 200 m, locally slightly more. The dataset is designed as an overview map at a scale of 1:200.000 and is suitable for educational purposes, regional-scale analyses and as background information for other thematic maps. The dataset is not subject to continuous updates and was published in GEUS Report 2011/19. Mapping of superficial deposits in Denmark has been a core task of the Danish geological surveys since the establishment of the Geological Survey of Denmark (DGU) in 1888. The digital superficial deposits map at a scale of 1:200.000, version 2, builds on this long mapping tradition but represents a modern digital compilation and interpretation based on more recent data and methods.

Skråbillederne er behandlet og optegnet i Flylaboratoriet i afdeling for petrologi og malmgeologi. Optagelsen af skråbillederne er foretaget i store målestoksforhold til senere fotogrammetrisk opmåling og 3D stereovisualisering af digital 3D kortdata.

Kort over israndslinjer og lokaliteter i Skandinavien. Kortet viser den gradvise afsmeltning af den skandinaviske iskappe i sidste istid. Kortet er udarbejdet i 1995 og består af polygoner der viser iskappens udbredelse i 5 perioder, recente iskapper, lokaliteter, DeGeerMoræner, israndslinjer og hypotetiske israndslinjer. Kortet er fremstillet til visning i 1:1 million og indgår som en del af bogen "Israndslinjer i Norden" udgivet af Nordisk Ministerråd i TemaNord 1998:584. Denne datasamling indeholder kun data for Skandinavien, Island er i en separat datasamling.