Using Terrestrial Laser Scanning to investigate geometric changes on a multi-temporal scale on a solifluction lobe in Vinstradalen, Norway
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- Institutt for geografi 
This study investigates how Terrestrial Lidar Scanning (or Lidar) can contribute to the acquisition of knowledge about surface displacement distribution by scanning a solifluction lobe over time. Within the field of periglacial geomorphology, there have been considerable advances in understanding the process of solifluction on the temporal scale. Still there is much uncertainty about how solifluction movement varies spatially and how solifluction as a process causes different landforms. Terrestrial Laser Scanning is viewed as a technology that can contribute to further discoveries about solifluction process-form relationships. Terrestrial Laser Scanning campaigns have been in the field four times in the course of a period between 2007 and 2014 to investigate surface dynamics on a large turfed-banked solifluction lobe in Vinstradalen in Norway. These have been analyzed with a surface comparison algorithm. Solifluction processes influence the entire land area at the site and there are many examples of different solifluction landforms. This has proven a challenge for the study, due to few reliable points of reference for data registration and alignment. Results show that the displacement distribution on the solifluction lobe is in accordance with the hypothesis of that more extensive movement would be found in the middle of the form toward the front. An interesting pattern on the upper central part of the lobe formed like a stream, shows signs of what can be interpreted as a preferred drainage route in combination with enhanced negative surface elevation changes. Further work with Terrestrial Laser Scanning is recommended on solifluction lobes in areas surrounded by stable areas, and with an established network of Ground Control Points to ensure accurate registration and alignment of data.