The sustainable use and management of natural resources in border regions require unambiguous geological information from neighbouring countries. However, the available data often lack compatibility and the same level of detail across borders. Aim of the Belgian-Dutch H3O projects is to produce seamless, cross-border, 3D geological and hydrogeological models of the Cenozoic deposits across the border between Belgium and The Netherlands. “H3O – De Voorkempen” is the third consecutive project, focusing on the Noorderkempen (Flanders) and the western part of Noord-Brabant (The Netherlands). The project started in 2020 and the final results will be delivered in 2023. A crucial step in any cross-border geological modelling task is to establish the correlation between lithostratigraphic units on both sides of the border. In this project, the correlation is initially based on the available knowledge of regional lithostratigraphy (including chronology, depositional environment, sedimentological characteristics) and then further fine-tuned based on the interpretation of high-quality boreholes, geophysical well logs and seismic lines that cover the main geological complexities and cross the international border. The correlations are graphically presented in a chrono-lithostratigraphic correlation chart and cross-section profiles. The established correlation scheme will be used as a base for converting or reinterpreting the available data. In the final stage, the harmonized datasets will be used to create a geometrically and stratigraphically consistent 3D model of “De Voorkempen”. The result will be a state-of-the-art reference for the subsurface structure of the project area, which can be used as a base for scientific research and cross-border management of natural resources. The Belgian-Dutch H3O projects are carried out by a partnership between TNO – Geological Survey of the Netherlands, VITO and RBINS – Geological Survey of Belgium, with support from the Flemish Bureau for Environment and Spatial Development (VPO), Flanders Environment Agency (VMM), Province of Noord-Brabant and drinking water company Brabant Water. The geological models are/will be available in the public domain via the online data portals of DOV (Database of the Subsoil in Flanders) and DINOloket (Data and Information on the Dutch Subsurface). For the technical reports of previous H3O projects, see Deckers et al., 2014 and Vernes et al., 2018. References Deckers, J., Vernes, R.W., Dabekaussen, W., Den Dulk, M., Doornenbal, J.C., Dusar, M., Hummelman, H.J., Matthijs, J., Menkovic, A., Reindersma, R.N., Walstra, J., Westerhoff, W.E. & Witmans, N., 2014. Geologisch en hydrogeologisch 3D model van het Cenozoïcum van de Roerdalslenk in Zuidoost-Nederland en Vlaanderen (H3O-Roerdalslenk). VITO/TNO report, Mol/Utrecht, 208 pp. (incl. 8 appendices). Vernes, R.W., Dekkers, J., Bakker, M., Bogemans, F., De Ceukelaire, M., Doornenbal, J., den Dulk, M., Dusar M., Van Haren, T., Heyvaert, V., Kiden, P., Kruisselbrink, A., Lanckacker, T., Menkovic, A., Meyvis, B., Munsterman, D., Reindersma, R., Rombaut, B., ten Veen, J., van de Ven, T., Walstra, J. & Witmans N., 2018. Geologisch en hydrogeologisch 3D model van het Cenozoïcum van de Belgisch-Nederlandse grensstreek van Midden-Brabant / De Kempen (H3O – De Kempen). TNO/VITO/KBIN-BGD report, Utrecht/Mol/Brussel, 109 pp. (+8 appendices).
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RBINS Staff Publications 2021
Low- and high-resolution Digital Terrain Models (DTMs) are available as interoperable gridded data layers and data products. These bathymetry data, together with increasing availability of various terrain analysis tools, give new impetus to a more uniform geomorphological mapping of the marine realm. To test approaches in sandy shelf areas, a multi-scale analysis was already performed on bathymetric data from the Belgian part of the North Sea using the Benthic Terrain Modeler (BTM) in ArcGIS and other GIS-related raster tools for analysing the topography of the seabed. Geomorphological features present on the Belgian Continental Shelf are sandbanks and crests, valleys and depressions, and sandwave fields. Recently, a derivative of the digital bathymetry model was constructed based on in-depth processing and re-interpretations of sediment cores in conjunction with extensive seismic records, resulting in a depth-converted structure map (DCSM) of the Top-Paleogene surface at high-resolution scale of 1:250 000 (De Clercq et al., 2016). Similar GIS analyses have now been conducted on the appearing submerged landscapes from 120,000 to 100,000 years ago allowing revealing planation surfaces, escarpements, slope breaks, paleo-valleys and -ridges in an automated way. Both resulting geomorphological mapping products contribute to EMODnet-Geology’s work packages on geomorphology and submerged landscapes. De Clercq, M., Chademenos, V., Van Lancker, V., & Missiaen, T. (2016). A high-resolution DEM for the Top-Palaeogene surface of the Belgian Continental Shelf. Journal of Maps 12(5), 1047-1054.
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RBINS Staff Publications 2019
