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Measurement of solifluction rates using multi-temporal aerial photography
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Social and Economic Geography.
Department of Geosciences, University of Oslo.
2009 (English)In: Earth Surface Processes and Landforms, ISSN 0197-9337, E-ISSN 1096-9837, Vol. 34, no 5, 725-737 p.Article in journal (Refereed) Published
Abstract [en]

A new method is presented to assess decadal solifluction lobe movement and volumetric changes at the catchmentscale. The method is based on photogrammetrical analysis of orthorectified repeat aerial photography in a geographic informationsystem (GIS). High resolution aerial photographs from two valleys in northern Sweden, Kärkevagge and Låktatjåkka valleys,are used to quantify changes of the lobe fronts, as an indication of solifluction rates over a period of 41 years. Two methods areexplored, the flow direction method and the front line method, in order to quantify the movement rates. Results show thatthe maximum combined root mean square error (RMSE) and resolution error amount to c. 1·7 m; no clear preference of onemeasurement method over the other was found. Application potential of the method is promising but reliability depends on themovement rates of the landforms and sufficient time span between the images. In the pilot study the measured yearly movementover the period 1959–2000 ranges from not-detectable to 63 mm/yr. Not-detectable means that movement cannot be detectedwithin the resolution used in the study. Lobe advance rates are similar to measured surface movement rates and volumetricsediment flux by solifluction is found to be considerably lower than a previous estimate by Rapp (1960). Implications for lobeadvance models are discussed. Photogrammetrical analysis is recommended as an important tool for detecting decadalsolifluction movement at the catchment scale.

Place, publisher, year, edition, pages
2009. Vol. 34, no 5, 725-737 p.
Keyword [en]
solifluction, lobe front advancement, photogrammetry, GIS
National Category
Earth and Related Environmental Sciences
Research subject
Physical Geography
Identifiers
URN: urn:nbn:se:uu:diva-102084DOI: 10.1002/esp.1773ISI: 000265301800008OAI: oai:DiVA.org:uu-102084DiVA: diva2:214150
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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