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Journal Article

Imprint of a dead-ice environment on lidar imagery—Spatial patterns at the last Scandinavian Ice Sheet margin (N Poland)

Authors

Woronko,  Barbara
External Organizations;

Danel,  Weronika
External Organizations;

Błaszkiewicz,  Mirosław
External Organizations;

Hermanowski,  Piotr
External Organizations;

Juschus,  Olaf
External Organizations;

Kramkowski,  Mateusz
External Organizations;

Garrett,  Bruno
External Organizations;

/persons/resource/brau

Brauer,  A.
4.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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5028105.pdf
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Citation

Woronko, B., Danel, W., Błaszkiewicz, M., Hermanowski, P., Juschus, O., Kramkowski, M., Garrett, B., Brauer, A. (2024): Imprint of a dead-ice environment on lidar imagery—Spatial patterns at the last Scandinavian Ice Sheet margin (N Poland). - Geomorphology, 466, 109434.
https://doi.org/10.1016/j.geomorph.2024.109434


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5028105
Abstract
There is a unique glacial landscape system in the southern Żarnowiec Moraine Plateau of northern Poland. Here the terrain is characterized by a very high concentration of ridges that are often adjacent to pits, which together constitutes a special type of hummocky topography. The morphological diversity of the study-area ridges and pits was determined from high-resolution lidar imagery that was qualitatively and quantitatively processed, then analysed. Fourteen test fields of spatial dimensions 0.5 km × 0.5 km were selected within the moraine plateau for detailed studies. The results show that the ridges and pits constitute a very dense network of approximately circular, diverse-oriented forms of various sizes, most of which are linked to each other in a step-wise fashion. The pits are surrounded by ridges of various heights and widths that separate one pit from another. A characteristic feature of the studied pits is the orientation of their long axis. Form-based morphological analysis revealed that their genesis was associated with a glacial rather than a periglacial environment. It is believed that ridge orientation reflects a spatial pattern related to ice crevasses. A moraine plateau constituted a terrain obstacle that acted as a counterslope to the advancing ice sheet. The studied landforms and landscape resulted from the ice sheet's breaking up into dead-ice blocks of various sizes. The very dense system of perpendicular, parallel, and diagonal crevasses was related to ice sheet advance from a northerly direction, resulting in a flow around the obstacle and differences in ice-mass speed.