Shallow landslide inventory covering selected catchment areas and communities in Vorarlberg (Austria)

Short description of the c3s shallow landslide inventory The presented C3S_shalan_inventory includes mapped shallow landslides ('shalan') which were defined as translational sliding movements of soil material (earth and debris) with a predefined surface of rupture in a depth of up to 2 m (see Cruden & Varnes 1996, Lateltin 2005). The inventory focuses on the following selected catchments and communities in Vorarlberg (Austria): Laternser valley (Laternsertal) Kleinwalser valley (Kleinwalsertal) Au Düns Dünserberg Übersaxen Schnepfau Zwischenwasser Landslide mapping focused on the period from the 1950ies to 2012 and was based on nine orthophoto series (195X, 197X, 198X, 199X, 2001, 2005, 2006, 2009, 2012) and two series of airborne laser scanning data (2004, 2011). Furthermore, event-based inventories with landslides mapped in the field after extreme rainfall events in May 1999 and August 2005 (Andrecs et al. 2002, Markart et al. 2007) and records of the Austrian Service for Torrent and Avalanche Control (WLV) and the former Geological Survey of Austria (GBA, now Geosphere Austria) were integrated. Data structure and attributes The inventory is divided into five Layers: c3s_shalan_inventory_depopoint: point in the centre of the main deposition (deposition point) c3s_shalan_inventory_scarpoint: point in the centre of the landslide scar (scar point) c3s_shalan_inventory_scararea: polygon delineating the scar area (scar area) c3s_shalan_inventory_slidepath: line along the trajectory of the process from the scar point to the tip (process trajectory) c3s_shalan_inventory_processzone: polygon delineating the whole visible landslide area (process area) The primary feature of each entity is the deposition point, which can entail one or more scar points, scar areas and process trajectories, as well as a process area. These entities can be identified via the EVENTID. Individual scar points and their mapped scar area (only for the Laternser valley, not available for each scar point) and the process trajectory can be identified via the SLIDEID. Further attributes are available: DATEFROM: Minimal date of occurrence, either the creation date of the orthophoto taken before the orthophoto the landslide was first mapped in, or any other information on the date of occurrence (e.g. field records, newspaper articles, witness reports). The landsides dated around the two landslide-triggering rainfall events on 21/22 May 1999 and 22/23 August 2005 are most reliable OPDATEFIRS: Creation date of the orthophoto the landslide was first mapped in OPDATEPRIO: Creation date of the orthophoto taken before the orthophoto the landslide was first mapped in DTMFIRST: Creation date of the digital terrain model the landslide was first mapped in DTMPRIOR: Creation date of the digital terrain model taken before the orthophoto the landslide was first mapped in MAX_DEPTH: Maximum difference between the second (2011) and the first (2004) DTM within each scar area, expressed as negative value MEAN_DEPTH: Mean difference between the second (2011) and the first (2004) DTM within each scar area, expressed as negative value DDTM_VOLUME: Volumetric difference between the second (2011) and the first (2004) DTM within each scar area, expressed as negative value MEAN_SLOPE: Mean slope angle within each scar area The C3S_shalan_inventory is provided as Geopackage (.gpkg) and as individual shapefiles with a respective QGIS project and layer styles. All files are provided in the MGI / Austria GK West (EPSG 31254) projection. Acknowledgements and references The C3S_shalan_inventory was compiled within the research project C3S-ISLS (Climate induced system status changes at slopes and their impact on shallow landslide susceptibility), funded by the Austrian Climate and Energy Fund, 5th ACRP Program). For further details about the inventory and studies the data were used in we refer to the following publications and presentations: Andrecs, P., Markart, G., Lang, E., Hagen, K., Kohl, B. and Bauer, W., (2002). Untersuchung der Rutschungsprozesse vom Mai 1999 im Laternsertal (Vorarlberg). BFW Berichte 127, 55–87 (available in print only). Cruden, D. M. and Varnes, D. J., (1996). Landslide types and processes. In: Turner, A. K. and Schuster, R. L. (eds.), Landslides - Investigation and Mitigation, Transportation Research Board Special Report 247, Washington D.C., 36–75. Lateltin, O., Haemmig, C., Raetzo, H., and Bonnard, C. (2005). Landslide risk management in Switzerland, Landslides, 2, 313–320, https://doi.org/10.1007/s10346-005-0018-8 Markart, G., Perzl, F., Kohl, B., Luzian, R., Kleemayr, K., Ess, B. and Mayerl, J. (2007). Schadereignisse 22./23. August 2005 - Ereignisdokumentation und -analyse in ausgewählten Gemeinden Vorarlbergs, BFW-Dokumentation Nr. 5. Austrian Research and Training Centre for Forests, Natural Hazards and Landscape, Vienna (48 pp.). https://bfw.ac.at/030/pdf/bfw-dok_5.pdf (in German) Perzl, F. and Rössel, M. (2017). Die BFW-Rutschungsdatenbank und das C3S-ISLS Rutschungsinventar. Presentation given at Innsbrucker Hofburggespräche, 2017-04-06. https://www.bfw.gv.at/wp-content/uploads/IHGApril17_Perzl_BFW-Rutschungsdatenbank_C3SRutschungsinventar.pdf (in German) Perzl, F., Rössel, M., Lauss, E. and Neuhauser, M. (2021). Mapping of protective function of forests in Austria against shallow landslides, In: Conference Proceedings of the 14th NTERPRAEVENT 2021 Congress. 31 May – 2 June 2021, Virtual Congress, Norway. Klagenfurt, Austria: International Research Society INTERPRAEVENT, pp. 240-248. Zieher, T., Perzl, F., Gruber, F., Rutzinger, M., Meißl, G. and Geitner, C. (2016). Data requirements for the assessment of shallow landslide susceptibility using logistic regression. In: Aversa, S., Cascini, L., Picarelli, L. and Scavia, C. (eds.), Landslides and Engineered Slopes. Experience, Theory and Practice, CRC Press, Boca Raton, 2139-2146. https://www.taylorfrancis.com/chapters/edit/10.1201/9781315375007-259/data-requirements-assessment-shallow-landslide-susceptibility-using-logistic-regression-zieher-gruber-rutzinger-mei%C3%9Fl-geitner-perzl Zieher, T., Perzl, F., Rössel, M., Rutzinger, M., Meißl, G., Markart, G. and Geitner, C. (2016). A multi-annual landslide inventory for the assessment of shallow landslide susceptibility - Two test cases in Vorarlberg, Austria, Geomorphology 259, 40-54. https://doi.org/10.1016/j.geomorph.2016.02.008 Zieher, T., Rutzinger, M., Schneider-Muntau, B., Perzl, F., Leidinger, D., Formayer, H. and Geitner, C. (2017). Sensitivity analysis and calibration of a dynamic physically based slope stability model, Natural Hazards and Earth System Sciences 17(6), 971-992. https://doi.org/10.5194/nhess-17-971-2017