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GIS modelling of the MIS 2-8 onshore glacial erosional pattern in northern Scandinavia
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. (paleoglaciologi/paleoglaciology)
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology. (paleoglaciologi/paleoglaciology)
2007 (English)In: Quaternary International, 2007Conference paper, Published paper (Refereed)
Abstract [en]

A 50-m cell size digital elevation dataset over northern Scandinavia has been analysed for patterns of glacial erosion using filtering techniques of the Erdas Imagine 8.6

spatial modeller software. A maximum value filtering technique using variable neighbourhoods has been applied such that existing highpoints in the landscape have been

used as erosional base levels for the reconstruction of past landscape relief. We assume that the highest surfaces have experienced no down-wearing (or, alternatively, an

even down-wearing could be specified) and also that the size of the valleys rather than the direction of the valleys relative to former ice flow directions determines how

much material has been removed by ice sheet erosion. Over multiple runs the reconstructed paleo-relief becomes increasingly dominated by the highest summits in the

landscape and the valley pattern is smoothed by in-filling from the sides. The model was run until eroded bedrock volumes equalled bedrock equivalents of erosion

products deposited during MIS 2, 6, 8, 10, 12, 18 and for the full glacial period offshore of northern Norway. The pattern of glacial erosion, which is mainly correlated to

slope angles and relative relief, is characterized by: (1) An abrupt start of glacial erosion below preserved summit areas; (2) Enhanced erosion in narrow valleys; (3)

Restricted erosion of smooth areas, independently of elevation; (4) Erosion of small scale irregularities, and; (5) Restricted erosion on isolated hills in low-relief terrain.

Place, publisher, year, edition, pages
2007.
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-21105OAI: oai:DiVA.org:su-21105DiVA: diva2:187631
Available from: 2007-12-06 Created: 2007-12-06Bibliographically approved

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Jansson, KristerAlm, GöranStroeven, Arjen
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CiteExportLink to record
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Citation style
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