10th International Conference on Geomorphology
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Late Weichselian history of the Moravian Sahara cold-climate dune field, Lower Moravian Basin, Czechia

Jakub Holuša1, Daniel Nývlt1,2, Barbara Woronko3, František Kuda4, Piotr Moska5, Michael Matějka1, and Radim Stuchlík1
Jakub Holuša et al.
  • 1Polar-Geo-Lab, Department of Geography, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czechia (holusa.jakub@mail.muni.cz)
  • 2Czech Geological Survey, Brno Branch, Leitnerova 22, 658 69 Brno, Czechia
  • 3Climate Geology Department, Faculty of Geology, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw, Poland
  • 4The Czech Academy of Sciences, Institute of Geonics, Drobného 28, 602 00 Brno, Czechia
  • 5Division of Geochronology and Environmental Isotopes, Department of Applied Physics, Silesian University of Technology, Konarskiego 22B street, 44-100 Gliwice, Poland

Aeolian dune field pattern could provide a very detailed image of the influence of environmental controlling factors (wind regime, topography, sediment supply and others) to its development. Moravian Sahara dune field located in Southern Moravia, Czechia, and thus far away from the European Sand Belt (i.e. the area of major aeolian accumulations in Europe), represent a unique archive reflecting the effects of these variables. Even despite its remoteness from the Fennoscandian Ice Sheet during the Last Glacial Maximum, the permafrost occurred in Southern Moravia, and thus periglacial processes operated here. Different approaches including LiDAR DTM analysis, ground-penetration radar (GPR), and near-surface wind modelling were applied to investigate the role of the controlling factors. Two groups of differently oriented periglacial-related dunes (ENE-WSW and N-S) have been distinguished via the DTMs, suggesting a significant twist in atmospheric circulation connected with the retreat of the Fennoscandian Ice Sheet after the Last Glacial Maximum. Beside that, a strong influence of the local topography to the modification of the wind flow and the possible sediment sources were distinguished and described. Furthermore, confrontation of the reconstructed palaeowind directions with the modelled atmospheric circulation during the Weichselian and the OSL ages of aeolian sediments enabled the temporal assignment of the Moravian Sahara dune field development to the Late Pleniglacial and Late Glacial periods. Thus, our results show their applicability to the very detailed study of the influence of environmental conditions on the development of the cold-climate aeolian dune fields.

How to cite: Holuša, J., Nývlt, D., Woronko, B., Kuda, F., Moska, P., Matějka, M., and Stuchlík, R.: Late Weichselian history of the Moravian Sahara cold-climate dune field, Lower Moravian Basin, Czechia, 10th International Conference on Geomorphology, Coimbra, Portugal, 12–16 Sep 2022, ICG2022-105, https://doi.org/10.5194/icg2022-105, 2022.