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LiDAR mapping of presumed rock-cored drumlins in the Lake Åsnen area, Småland, South Sweden

Zaman, Patrik LU (2015) In Dissertations in Geology at Lund University GEOL01 20151
Department of Geology
Abstract
The landform group called drumlins has since long been enigmatic; this study aims to shed some light on them. By mapping their extent in two areas around Lake Åsnen, Småland, southern Sweden, their extent and prop-erties have been mapped with a level of detail that would have been next to impossible just a few years ago. The method used in this study utilized LiDAR derived high resolution hillshade models to map out the drumlins extent and investigate whether any outcrops of bedrock could be identified inside their rim. The mapped data’s accuracy was then verified through a field survey. In total 201 drumlins were checked, 114 in the Vemboö area and 87 in the Torne area. The result showed that for the Vemboö area, 92.1%, and for the Torne... (More)
The landform group called drumlins has since long been enigmatic; this study aims to shed some light on them. By mapping their extent in two areas around Lake Åsnen, Småland, southern Sweden, their extent and prop-erties have been mapped with a level of detail that would have been next to impossible just a few years ago. The method used in this study utilized LiDAR derived high resolution hillshade models to map out the drumlins extent and investigate whether any outcrops of bedrock could be identified inside their rim. The mapped data’s accuracy was then verified through a field survey. In total 201 drumlins were checked, 114 in the Vemboö area and 87 in the Torne area. The result showed that for the Vemboö area, 92.1%, and for the Torne area, 75.9%, of the drumlins were found to have a hard-core of bedrock. This indicates that it’s probable that the drumlins where no bedrock could be identified also most likely has one, but situated at some depth superimposed by till and other sediments. The method of mapping bedrock outcrops through hill shade models also proved accurate in more than 95% of the cases; this shows that this method is so reliable that it might be recommended for use over larger areas without the type of extensive field verification carried out in this study. (Less)
Abstract (Swedish)
Landskapsformen drumlin har länge diskuterats inom akademin och den här studen syftar till att sprida lite ljus över dom. Genom att kartlägga två drumlinområden runt sjön Åsnen i Småland, södra Sverige har deras utsträckning kartlagts med en precision som länge ansetts omöjligt. Detta gjordes genom att använda hög upplösta hillshade modeller framtagna från LiDAR data för att efter att ha analyserat deras utsträckning identifiera utsickande bergshällar som kan utgöra dess bergskärna. Säkerheten hos modellen undersöktes sedan genom en fält-studie. Totalt undersöktes 201 drumliner, 114 runt Vemboö och 87 runt Torne. Resultatet visade att för Vemboö hade 92,1% alla drumliner en bergskärna och för Torne 75,9% Resultatet indikerar att det är... (More)
Landskapsformen drumlin har länge diskuterats inom akademin och den här studen syftar till att sprida lite ljus över dom. Genom att kartlägga två drumlinområden runt sjön Åsnen i Småland, södra Sverige har deras utsträckning kartlagts med en precision som länge ansetts omöjligt. Detta gjordes genom att använda hög upplösta hillshade modeller framtagna från LiDAR data för att efter att ha analyserat deras utsträckning identifiera utsickande bergshällar som kan utgöra dess bergskärna. Säkerheten hos modellen undersöktes sedan genom en fält-studie. Totalt undersöktes 201 drumliner, 114 runt Vemboö och 87 runt Torne. Resultatet visade att för Vemboö hade 92,1% alla drumliner en bergskärna och för Torne 75,9% Resultatet indikerar att det är troligt att drumlinerna som saknar identifierad bergskärna troligtvis har en som är övertäkt av sediment eller morän. Metoden för att iden-tifiera bergskärnorna i modellen visade sig även ha en säkerhet på mer än 95%. Vilket är tillräckligt bra för att kunna rekommendera att metoden används på ett större område utan den behov av den stora fältstudie som skedde i anslutning till den här studien. (Less)
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author
Zaman, Patrik LU
supervisor
organization
course
GEOL01 20151
year
type
M2 - Bachelor Degree
subject
keywords
drumlins, DEM, LiDAR, rock-core, Digital Elevation Model, bedrock-core, Småland, Lake Åsnen, streamlined terrain
publication/series
Dissertations in Geology at Lund University
report number
458
language
English
id
7869167
date added to LUP
2015-09-18 08:51:07
date last changed
2015-09-18 08:51:07
@misc{7869167,
  abstract     = {The landform group called drumlins has since long been enigmatic; this study aims to shed some light on them. By mapping their extent in two areas around Lake Åsnen, Småland, southern Sweden, their extent and prop-erties have been mapped with a level of detail that would have been next to impossible just a few years ago. The method used in this study utilized LiDAR derived high resolution hillshade models to map out the drumlins extent and investigate whether any outcrops of bedrock could be identified inside their rim. The mapped data’s accuracy was then verified through a field survey. In total 201 drumlins were checked, 114 in the Vemboö area and 87 in the Torne area. The result showed that for the Vemboö area, 92.1%, and for the Torne area, 75.9%, of the drumlins were found to have a hard-core of bedrock. This indicates that it’s probable that the drumlins where no bedrock could be identified also most likely has one, but situated at some depth superimposed by till and other sediments. The method of mapping bedrock outcrops through hill shade models also proved accurate in more than 95% of the cases; this shows that this method is so reliable that it might be recommended for use over larger areas without the type of extensive field verification carried out in this study.},
  author       = {Zaman, Patrik},
  keyword      = {drumlins,DEM,LiDAR,rock-core,Digital Elevation Model,bedrock-core,Småland,Lake Åsnen,streamlined terrain},
  language     = {eng},
  note         = {Student Paper},
  series       = {Dissertations in Geology at Lund University},
  title        = {LiDAR mapping of presumed rock-cored drumlins in the Lake Åsnen area, Småland, South Sweden},
  year         = {2015},
}