LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?

The aim of this study was to map the prevalence of aeolian sand dunes in Västerbotten, northern Sweden to find dunes formed during earlier deglaciation phases, which was then preserved in cold-based conditions during the youngest stadial of the Weichselian glaciation. These preserved dunes were expe...

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Bibliographic Details
Main Author: Bogren, Fredrik
Format: Others
Language:Swedish
Published: Umeå universitet, Institutionen för ekologi, miljö och geovetenskap 2015
Subjects:
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-104812
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spelling ndltd-UPSALLA1-oai-DiVA.org-umu-1048122018-01-12T05:11:05ZLIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?sweAnalysis of aeolian sand dunes in the inland of Västerbotten using LIDAR-derived images : Has dune morphology formed during earlier interstadials been preserved in the landscape?Bogren, FredrikUmeå universitet, Institutionen för ekologi, miljö och geovetenskap2015LIDARdigital elevation model (dem)aeolian sand dunestill-coveredpreserved morphologyLIDARdigital höjdmodell (dem)flygsanddynermoräntäcktbevarad morfologiGeologyGeologiPhysical GeographyNaturgeografiThe aim of this study was to map the prevalence of aeolian sand dunes in Västerbotten, northern Sweden to find dunes formed during earlier deglaciation phases, which was then preserved in cold-based conditions during the youngest stadial of the Weichselian glaciation. These preserved dunes were expected to be covered by a layer of till and have a rather faint morphology compared to dunes formed during the Holocene. Consequently, high resolution LIDAR-derived images from the Swedish mapping, cadastral and land registration authority (Lantmäteriet) was used to detect the dunes throughout an area covering most of Västerbotten, above the highest coastline and below the mountain range. The analysis resulted in several new findings of aeolian dunes compared to the findings in the quaternary soil map created by the Geological Survey of Sweden. Despite the fact some of the dunes at the LIDAR-derived image had a strange faint appearance, it was quickly evident during the fieldwork that the aeolian sand was not covered by till on any of the dunes visited. The common view during the last decades has been that cold-based ice will not erode or alter the morphology of the landscape beneath the ice. However, this study suggests that hypothesis may not be entirely correct, and therefore it can be hard to use geomorphological implications to reconstruct past glacial environments. Thus, it can be concluded that even under cold-based conditions, preservation of aeolian sand dunes in Västerbotten is probably not very common. Student thesisinfo:eu-repo/semantics/bachelorThesistexthttp://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-104812application/pdfinfo:eu-repo/semantics/openAccess
collection NDLTD
language Swedish
format Others
sources NDLTD
topic LIDAR
digital elevation model (dem)
aeolian sand dunes
till-covered
preserved morphology
LIDAR
digital höjdmodell (dem)
flygsanddyner
moräntäckt
bevarad morfologi
Geology
Geologi
Physical Geography
Naturgeografi
spellingShingle LIDAR
digital elevation model (dem)
aeolian sand dunes
till-covered
preserved morphology
LIDAR
digital höjdmodell (dem)
flygsanddyner
moräntäckt
bevarad morfologi
Geology
Geologi
Physical Geography
Naturgeografi
Bogren, Fredrik
LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
description The aim of this study was to map the prevalence of aeolian sand dunes in Västerbotten, northern Sweden to find dunes formed during earlier deglaciation phases, which was then preserved in cold-based conditions during the youngest stadial of the Weichselian glaciation. These preserved dunes were expected to be covered by a layer of till and have a rather faint morphology compared to dunes formed during the Holocene. Consequently, high resolution LIDAR-derived images from the Swedish mapping, cadastral and land registration authority (Lantmäteriet) was used to detect the dunes throughout an area covering most of Västerbotten, above the highest coastline and below the mountain range. The analysis resulted in several new findings of aeolian dunes compared to the findings in the quaternary soil map created by the Geological Survey of Sweden. Despite the fact some of the dunes at the LIDAR-derived image had a strange faint appearance, it was quickly evident during the fieldwork that the aeolian sand was not covered by till on any of the dunes visited. The common view during the last decades has been that cold-based ice will not erode or alter the morphology of the landscape beneath the ice. However, this study suggests that hypothesis may not be entirely correct, and therefore it can be hard to use geomorphological implications to reconstruct past glacial environments. Thus, it can be concluded that even under cold-based conditions, preservation of aeolian sand dunes in Västerbotten is probably not very common.
author Bogren, Fredrik
author_facet Bogren, Fredrik
author_sort Bogren, Fredrik
title LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
title_short LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
title_full LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
title_fullStr LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
title_full_unstemmed LIDAR-analys av flygsanddyner i Västerbottens inland : Har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
title_sort lidar-analys av flygsanddyner i västerbottens inland : har dynmorfologi bildad under tidigare interstadialer bevarats i landskapet?
publisher Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
publishDate 2015
url http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-104812
work_keys_str_mv AT bogrenfredrik lidaranalysavflygsanddynerivasterbottensinlandhardynmorfologibildadundertidigareinterstadialerbevaratsilandskapet
AT bogrenfredrik analysisofaeoliansanddunesintheinlandofvasterbottenusinglidarderivedimageshasdunemorphologyformedduringearlierinterstadialsbeenpreservedinthelandscape
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