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Geological (G3Dv3) and hydrogeological (H3D) 3D layer model of Flanders

Book - Report

In 2013, the Flemish Environmental Planning Bureau of the Department of Environment and the Flemish Environment Agency commissioned the creation of a new, more detailed 3D geological and a new 3D hydrogeological model. Both models had to be able to be translated into each other as much as possible. For the creation of both new models, existing data and, if available, interpretations of this data were used, including mainly drill descriptions, borehole measurements and seismic data, but also previous geological and hydrogeological models and an extensive set of literature. In order to steer the modelling in areas with little data, (new or from the G3Dv2 model) geological concepts were used (lithological transitions, fracture action, ...). In order to be able to carry out the modelling of members, detailed data is required. This detail is not always present in drill descriptions. For this reason, (re)interpretations of drillings with geophysical borehole measurements were often relied upon. The G3Dv3 and H3D models were completed in 2019. These models consist of 117 geological and 139 hydrogeological units. Both models are the most detailed and up-to-date models of the Flemish subsoil. The G3Dv3- and H3D-model try to give as complete an overview as possible of the geology and hydrogeology at any location in Flanders. This makes them a handy summary of the geological knowledge that has been collected about Flanders over the past centuries. This report describes the methodology for the development and final results of this G3Dv3 and H3D model. The results of this modelling are freely available on the portal of Databank Ondergrond Vlaanderen, https://www.dov.vlaanderen.be/.
Number of pages: 286
Publication year:2019
Keywords:P430-mineral-deposits, P470-hydrogeology