2014 GSA Annual Meeting in Vancouver, British Columbia (19–22 October 2014)

Paper No. 211-11
Presentation Time: 11:30 AM

GEOMORPHOLOGY AND GEOMATICS FOR THE STUDY OF LANDFORMS AND DEPOSITS RELATED TO THE FLIMS AND TAMINS LANDSLIDES (RHEIN VALLEY, SWITZERLAND)


MASERA, Diego1, CALHOUN, Nancy2, CLAGUE, John3, GIARDINO, Marco4, PEROTTI, Luigi5, POSCHINGER, Andrea6 and ROBERTI, Gioachino1, (1)Earth Sciences Department, University of Torino, Via Valperga Caluso 35, Torino, 10125, Italy, (2)Earth Sciences, Simon Fraser University, Vancouver, BC V5A 1S6, Canada, (3)Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A1S6, Canada, (4)Earth Sciences, University of Torino, Torino, I-10125, Italy, (5)Department of Earth Sciences, University of Torino, Via Valperga Caluso 35, Torino, 10125, Italy, (6)Bavarian Environment Agency, Augsburg, D-86179, Germany

This study analyzes landforms and deposits related to the Flims and Tamins landslides (Rhein Valley, Switzerland) by means of an integrated geomorphological-geomatic approach including literature analysis, field mapping and remote sensing data.

These huge landslides (estimated volume about 9,3 km3 for Flims and about 1,6 km3 for Tamins) occurred during a sequence of slope instabilities in the Rhein valley about 9000 years ago. Focus of the study are some very peculiar landforms called "Toma Hills" distributed around the Vorderrhein-Hinterrhein confluence. After long debates (1840-2014) literature indicated them as generic landslide-related landforms, even if precise relationships to slope tectonic processes haven't been cleared yet.

The integrated analysis of the area followed a simple workflow, here presented with related results: A) geomatic analysis of LiDAR-derived DTM (Swissmap): production of base maps for field work (hillshade and 1 m spacing contour maps) and a remote sensing of the landforms; B) Field data collection and digital GIS mapping of deposits and landforms by means of pocket PC and GPS; C) Comparison of Classic/Rigorous (geometrically correct) and Innovative/Fast (dense image matching SfM) close range photogrammetry (acquisition techniques and elaboration software) and application on selected outcrops of landslide deposits. D) Digital map production of field and remote data elaboration and an interpretative legend was proposed.

Four sub-areas have been individualized and described thanks to the detailed geomorphological interpretation of LiDAR DTMs, thus introducing new insights. The eastern boundary of the Flims landslide deposit was precisely located. New interpretation of the Toma Hills' position with respect to the Bonaduz gravels (peculiar lake infill unit) was proposed, updating -without denying- the framework provided by the literature. Moreover, the Innovative/Fast photogrammetric technique was validated by creating good qualitative 3D models, and evaluated as a perfect solution for sedimentological and morpho-structural outcrops analysis.

Session No. 211

T43. Automated approaches to Mapping Geological Materials and Landforms (Posters)
Tuesday, 21 October 2014: 9:00 AM-6:30 PM
Exhibition Hall C (Vancouver Convention Centre-West)
Geological Society of America Abstracts with Programs. Vol. 46, No. 6, p.524
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