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Spatial analysis of solifluction landforms and process rates in the Abisko Mountains, northern Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Department of Geosciences, Physical Geography, University of Oslo, Norway.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2010 (English)In: Permafrost and Periglacial Processes, ISSN 1045-6740, E-ISSN 1099-1530, Vol. 21, no 3, 241-255 p.Article in journal (Refereed) Published
Abstract [en]

The occurrence of turf-banked solifluction landforms in the Abisko region was analysed using a grid-based approach and statistical modelling through logistic regression. Significant parameters in the model were the vegetation index NDVI, annual incoming potential radiation, wetness index, slope gradient and elevation. The model had   an acceptable discrimination capacity and rather low model-fit values, but clearly showed the importance of vegetation patterns for the   occurrence of solifluction at a regional scale. Solifluction movement   rates measured at eight sites were combined with model parameters and   the annual duration of sun hours to regionalise solifluction movement   rates through an unsupervised terrain classification. For comparison, the linear relationship between the probability of solifluction occurrence and variations in movement rates was also used to regionalise movement rates. Potential geomorphic work was calculated   for six different areas within the region, with the greatest being for  Ka " rkevagge, the area with the highest precipitation. The combination of a logistic regression model of mapped landforms and field  measurements of solifluction rates represents a promising methodology  to assess the occurrence and activity of the process at a regional scale.

Place, publisher, year, edition, pages
2010. Vol. 21, no 3, 241-255 p.
Keyword [en]
solifluction, regional scale, geomorphometry, geomorphic work, geomorphic process, logistic, regression, periglacial, spatial modelling
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-102086DOI: 10.1002/ppp.681ISI: 000282079900002OAI: oai:DiVA.org:uu-102086DiVA: diva2:214156
Available from: 2009-05-04 Created: 2009-05-04 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Spatial and Temporal Variations of Solifluction and Related Environmental Parameters in the Abisko Mountains, Northern Sweden
Open this publication in new window or tab >>Spatial and Temporal Variations of Solifluction and Related Environmental Parameters in the Abisko Mountains, Northern Sweden
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents an assessment of the variation in solifluction occurrence, morphometry and movement rates in the Abisko region, northern Sweden. Variations in movement rates are analyzed both on a regional and local scale. The main methodological contributions of this thesis have been to provide new techniques of analyzing spatial and temporal variations of solifluction in order to detect long term temporal trends and to regionalize the variations in movement rates. The spatial analysis is achieved by using a combination of field measurements, GIS and remote sensing techniques and statistical analysis. The results are presented in six papers, focusing on the morphometry of solifluction landforms (paper I), the occurrence of permafrost (paper II), the spatial and temporal variations of lobe front movement rates using aerial photographs (paper III), the temporal, regional and local spatial variations in movement rates (paper IV – VI) and statistical modelling of the occurrence of solifluction landforms and calculation of geomorphic work (paper V and VI).

The results show that, on a regional scale, vegetation patterns are a major control on the occurrence of turf-banked solifluction landforms, with high NDVI-values (vegetation) associated with the presence of forms. Elevation is also a major control on a regional scale with a decrease in lobe dimensions and movement rates with increased elevation. High soil moisture values are associated with larger landforms and increased movement rates. Movement rates are generally higher in the western part of the region and appear to increase with higher MAAT. Equally, geomorphic work is greatest in the western part of the region. The important controls on a local scale vary from site to site, but include vegetation, slope angle and soil moisture. The photo analysis indicates that annual movement rates of lobe fronts in Kärkevagge and Låktatjåkka valley over the period 1959-2000 ranges from not-detectable to 63mm/yr. The permafrost model shows probabilities >0.8 for permafrost at elevations above 1300 m a.s.l. in the western part of the region, decreasing to altitudes over 850 m a.s.l. in the eastern part of the region. Calculated geomorphic work suggests that solifluction is a significant denudational agent in the sub-Arctic mountains of northern Sweden, but less so than previously estimated.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 54 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 648
Series
Keyword
solifluction, movement rates, Abisko region, Geographical Information Systems, statistical modelling, geomorphic work, permafrost
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:uu:diva-101419 (URN)978-91-554-7538-3 (ISBN)
Public defence
2009-06-12, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2009-05-18 Created: 2009-04-27 Last updated: 2009-05-18Bibliographically approved

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Ridefelt, HannaBoelhouwers, Jan

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