Measurement of solifluction rates using multi-temporal aerial photography
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
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.
solifluction, lobe front advancement, photogrammetry, GIS
Earth and Related Environmental Sciences
Research subject Physical Geography
IdentifiersURN: urn:nbn:se:uu:diva-102084DOI: 10.1002/esp.1773ISI: 000265301800008OAI: oai:DiVA.org:uu-102084DiVA: diva2:214150