Research article 11 Sep 2020
Research article | 11 Sep 2020
Current glacier recession causes significant rockfall increase: the immediate paraglacial response of deglaciating cirque walls
Ingo Hartmeyer et al.
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Multispectral remote sensing images enable landslide detection and monitoring, but its applicability for time–critical early–warning is rarely studied. Here we present a concept to operationalise the use for landslide early–warning aiming to extend lead time. We tested PlanetScope and UAS images on a complex mass movement and compared processing times to historic benchmarks. We show that acquired data is within the forecasting window approving the feasibility for landslide early–warning.
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Rockfall size and frequency in two deglaciating cirques in the Central Alps, Austria, is analysed based on 6-year rockwall monitoring with terrestrial lidar (2011–2017). The erosion rates derived from this dataset are very high due to a frequent occurrence of large rockfalls in freshly deglaciated areas. The results obtained are important for rockfall hazard assessments, as, in rockwalls affected by glacier retreat, historical rockfall patterns are not good predictors of future events.
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Processes destabilising recently deglaciated rocks, driving cirque headwall retreat, and putting alpine infrastructure at risk are poorly understood due to scarce in situ data. We monitored fracture deformation at a cirque headwall in the Austria Alps. We found thermo-mechanical expansion and freeze-thaw action as dominant processes for deformation. Our results highlight the importance of liquid water in combination with subzero-temperatures on the destabilisation of glacier headwalls.
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In the semi-arid to arid Andes of Argentina, rock glaciers contain invisible and unknown amounts of ground ice that could become more important in future for the water availability during the dry season. The study shows that the investigated rock glacier represents an important long-term ice reservoir in the dry mountain catchment and that interannual changes of ground ice can store and release significant amounts of annual precipitation.
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A. Barkwith, C. W. Thomas, P. W. Limber, M. A. Ellis, and A. B. Murray
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Cited articles
Abellán, A., Vilaplana, J. M., Calvet, J., García-Sellés, D., and Asensio, E.: Rockfall monitoring by Terrestrial Laser Scanning – case study of the basaltic rock face at Castellfollit de la Roca (Catalonia, Spain), Nat. Hazards Earth Syst. Sci., 11, 829–841, https://doi.org/10.5194/nhess-11-829-2011, 2011.
Allen, S. K., Cox, S. C., and Owens, I. F.:
Rock avalanches and other landslides in the central Southern Alps of New Zealand: a regional study considering possible climate change impacts,
Landslides,
8, 33–48, 2010.
Auer, I., Foelsche, U., Böhm, R., Chimani, B., Haimberger, L., Kerschner, H., Koinig, K. A., Nicolussi, K., and Spötl, C.:
Vergangene Klimaänderung in Österreich,
in: Österreichischer Sachstandsbericht Klimawandel 2014 (AAR14),
edited by: Kromp-Kolb, H., Nakicenovic, N., Steininger, K., Gobiet, A., Formayer, H., Köppl, A, Prettenthaler, F., Stötter, J., and Schneider, J.,
Verlag der Österreichischen Akademie der Wissenschaften, Vienna, Austria, 227–300, 2014.
Augustinus, P. C.:
Glacial valley cross-profile development: the influence of in situ rock stress and rock mass strength, with examples from the Southern Alps, New Zealand,
Geomorphology,
14, 87–97, 1995.
Church, M. and Ryder, J.:
Paraglacial sedimentation: A consideration of fluvial processes conditioned by glaciation,
Geol. Soc. Am. Bull.,
83, 3059–3072, 1972.
Cossart, E., Braucher, R., Fort, M., Bourlès, D. L., and Carcaillet, J.:
Slope instability in relation to glacial debuttressing in alpine areas (Upper Durance catchment, southeastern France): Evidence from field data and 10Be cosmic ray exposure ages,
Geomorphology,
95, 3–26, 2008.
de Haas, T., Conway, S. J., and Krautblatter, M.:
Recent (Late Amazonian) enhanced backweathering rates on Mars: Paracratering evidence from gully alcoves,
J. Geophys. Res.-Planet.,
120, 2169–2189, 2015.
Draebing, D., Krautblatter, M., and Dikau, R.:
Interaction of thermal and mechanical processes in steep permafrost rock walls: A conceptual approach,
Geomorphology,
226, 226–235, 2014.
Duca, S., Occhiena, C., Mattone, M., Sambuelli, L., and Scavia, C.:
Feasibility of ice segregation location by acoustic emission detection: A laboratory test in gneiss,
Permafrost Periglac.,
25, 208–219, 2014.
Dussauge-Peisser, C., Helmstetter, A., Grasso, J.-R., Hantz, D., Desvarreux, P., Jeannin, M., and Giraud, A.: Probabilistic approach to rock fall hazard assessment: potential of historical data analysis, Nat. Hazards Earth Syst. Sci., 2, 15–26, https://doi.org/10.5194/nhess-2-15-2002, 2002.
Evans, I. S.:
Process and form in the erosion of glaciated mountains,
in: Process and Form in Geomorphology,
edited by: Stoddart, D. R.,
Routledge, London, 145–174, 1997.
Gischig, V. S., Moore, J. R., Evans, K. F., Amann, F., and Loew, S.:
Thermomechanical forcing of deep rock slope deformation: 1. Conceptual study of a simplified slope,
J. Geophys. Res.-Earth,
116, F04010, https://doi.org/10.1029/2011JF002006, 2011.
Grämiger, L., Moore, J. R., Gischig, V. S., Ivy-Ochs, S., and Loew, S.:
Beyond debuttressing: Mechanics of paraglacial rock slope damage during repeat glacial cycles,
J. Geophys. Res.-Earth,
122, 1004–1036, 2017.
Gruber, S., Hoelzle, M., and Haeberli, W.:
Rock-wall temperatures in the Alps: modelling their topographic distribution and regional differences,
Permafrost Periglac.,
15, 299–307, 2004.
Haberkorn, A., Phillips, M., Kenner, R., Rhyner, H., Bavay, M., Galos, S. P., and Hoelzle, M.:
Thermal regime of rock and its relation to snow cover in steep alpine rock walls: Gemsstock, Central Swiss Alps,
Geogr. Ann. A,
97, 579–597, 2015.
Haeberli, W., Hoelzle, M., Paul, F., and Zemp, M.:
Integrated monitoring of mountain glaciers as key indicators of global climate change: the European Alps,
Ann. Glaciol.,
46, 150–160, 2007.
Hallet, B., Walder, J. S., and Stubbs, C. W.:
Weathering by segregation ice growth in microcracks at sustained subzero temperatures: Verification from an experimental study using acoustic emissions,
Permafrost Periglac.,
2, 283–300, 1991.
Hartmeyer, I., Keuschnig, M., Delleske, R.,
Krautblatter, M., Lang, A., Schrott, L., Prasicek, G., and Otto, J.-C.:
A 6-year lidar survey reveals enhanced rockwall retreat and modified rockfall magnitudes/frequencies in deglaciating cirques, Earth Surf. Dynam., 8, 753–768, https://doi.org/10.5194/esurf-8-753-2020, 2020a.
Hartmeyer, I., Delleske, R., Keuschnig, M., and Krautblatter, M.: Rockfall Source Areas, Kitzsteinhorn, Austria (2011–2017), mediaTUM, https://doi.org/10.14459/2020mp1540134, 2020b.
Hasler, A., Gruber, S., Font, M., and Dubois, A.:
Advective heat transport in frozen rock clefts: Conceptual model, laboratory experiments and numerical simulation,
Permafrost Periglac.,
22, 378–389, 2011.
James, M. R., Robson, S., and Smith, M. W.:
3-D uncertainty-based topographic change detection with structure-from-motion photogrammetry: precision maps for ground control and directly georeferenced surveys,
Earth Surf. Proc. Land.,
42, 1769–1788, 2017.
Kaser, G., Cogley, J. G., Dyurgerov, M. B., Meier, M. F., and Ohmura, A.:
Mass balance of glaciers and ice caps: Consensus estimates for 1961–2004,
Geophys. Res. Lett.,
33, L19501, https://doi.org/10.1029/2006GL027511, 2006.
Kenner, R., Phillips, M., Danioth, C., Denier, C., Thee, P., and Zgraggen, A.:
Investigation of rock and ice loss in a recently deglaciated mountain rock wall using terrestrial laser scanning: Gemsstock, Swiss Alps,
Cold Reg. Sci. Technol.,
67, 157–164, 2011.
Keuschnig, M., Hartmeyer, I., Höfer-Öllinger, G., Schober, A., Krautblatter, M., and Schrott, L.:
Permafrost-related mass movements: Implications from a rock slide at the Kitzsteinhorn, Austria,
in: Engineering Geology for Society and Territory, Vol. 1,
edited by: Lollino, G., Manconi, A., Clague, J. Shan, W., and Chiarle, M.,
Springer International Publishing, 255–259, 2015.
Krautblatter, M., Funk, D., and Günzel, F.:
Why permafrost rocks become unstable: a rock-ice-mechanical model in time and space,
Earth Surf. Proc. Land.,
38, 876–887, 2013.
Krautblatter, M. and Moore, J. R.:
Rock slope instability and erosion: toward improved process understanding,
Earth Surf. Proc. Land.,
39, 1273–1278, 2014.
Lague, D., Brodu, N., and Leroux, J.:
Accurate 3D comparison of complex topography with terrestrial laser scanner: Application to the Rangitikei canyon (N-Z),
ISPRS J. Photogramm.,
82, 10–26, 2013.
Land Salzburg:
Waldstandsaufnahme D, Bild 86-88, 24.08.1953,
Salzburger Geographisches Informationssystem, SAGIS, available at: https://www.salzburg.gv.at/sagismobile/sagisonline/map/Basiskarten/Historische Orthofotos (last access: 2 September 2020), Salzburg, Austria, 1953.
Land Salzburg:
Laserscanbefliegung Bundesland Salzburg 2008,
Salzburger Geographisches Informationssystem SAGIS, available at: https://www.salzburg.gv.at/sagismobile/sagisonline (last access: 2 September 2020), Salzburg, Austria, 2008.
Manconi, A., Coviello, V., Galletti, M., and Seifert, R.: Short Communication: Monitoring rockfalls with the Raspberry Shake, Earth Surf. Dynam., 6, 1219–1227, https://doi.org/10.5194/esurf-6-1219-2018, 2018.
Matsuoka, N. and Murton, J. B.:
Frost weathering: recent advances and future directions,
Permafrost Periglac.,
19, 195–210, 2008.
McColl, S. T.: Paraglacial rock-slope stability, Geomorphology, 153–154, 1–16, 2012.
McColl, S. T. and Davies, T. R. H.:
Large ice-contact slope movements: glacial buttressing, deformation and erosion,
Earth Surf. Proc. Land.,
38, 1102–1115, 2012.
Pelto, M. S.: Forecasting temperate alpine glacier survival from accumulation zone observations, The Cryosphere, 4, 67–75, https://doi.org/10.5194/tc-4-67-2010, 2010.
Purdie, H.:
Glacier retreat and tourism: Insights from New Zealand,
Mt. Res. Dev.,
33, 463–472, 2013.
Rabatel, A., Deline, P., Jaillet, S., and Ravanel, L.:
Rock falls in high-alpine rock walls quantified by terrestrial lidar measurements: A case study in the Mont Blanc area,
Geophys. Res. Lett.,
35, L10502, https://doi.org/10.1029/2008GL033424, 2008.
Ravanel, L. and Deline, P.:
Climate influence on rockfalls in high-alpine steep rockwalls: The north side of the Aiguilles de Chamonix (Mont Blanc massif) since the end of the “Little Ice Age”,
Holocene,
21, 357–365, 2010.
Ravanel, L., Deline, P., Lambiel, C., and Vincent, C.:
Instability of a high alpine rock ridge: the lower arête des cosmiques, mont blanc massif, France,
Geogr. Ann. A,
95, 51–66, 2013.
Sass, O.:
Rock moisture fluctuations during freeze-thaw cycles: Preliminary results from electrical resistivity measurements,
Polar Geography,
28, 13–31, 2004.
Scherler, D., Bookhagen, B., and Strecker, M. R.:
Hillslope-glacier coupling: The interplay of topography and glacial dynamics in High Asia,
J. Geophys. Res.-Earth,
116, F02019, https://doi.org/10.1029/2010JF001751, 2011.
Soudarissanane, S., Lindenbergh, R., Menenti, M., and Teunissen, P.:
Scanning geometry: influencing factor on the quality of terrestrial laser scanning points,
ISPRS J. Photogramm.,
66, 389–399, 2011.
Strunden, J., Ehlers, T. A., Brehm, D., and Nettesheim, M.: Spatial and temporal variations in rockfall determined from TLS measurements in a deglaciated valley, Switzerland, J. Geophys. Res.-Earth, 120, 1251–1273, 2015.
Supper, R., Ottowitz, D., Jochum, B., Römer, A., Pfeiler, S., Kauer, S., Keuschnig, M., and Ita, A.:
Geoelectrical monitoring of frozen ground and permafrost in alpine areas: field studies and considerations towards an improved measuring technology,
Near Surf. Geophys.,
12, 93–115, 2014.
Teza, G., Galgaro, A., Zaltron, N., and Genevois, R.:
Terrestrial laser scanner to detect landslide displacement fields: a new approach,
Int. J. Remote Sens.,
28, 3425–3446, 2007.
Walder, J. S. and Hallet, B.:
The physical basis of frost weathering: Toward a more fundamental and unified perspective,
Arctic Alpine Res.,
18, 27–32, 1986.
Weber, S., Beutel, J., Faillettaz, J., Hasler, A., Krautblatter, M., and Vieli, A.: Quantifying irreversible movement in steep, fractured bedrock permafrost on Matterhorn (CH), The Cryosphere, 11, 567–583, https://doi.org/10.5194/tc-11-567-2017, 2017.
Weber, S., Beutel, J., Da Forno, R., Geiger, A., Gruber, S., Gsell, T., Hasler, A., Keller, M., Lim, R., Limpach, P., Meyer, M., Talzi, I., Thiele, L., Tschudin, C., Vieli, A., Vonder Mühll, D., and Yücel, M.: A decade of detailed observations (2008–2018) in steep bedrock permafrost at the Matterhorn Hörnligrat (Zermatt, CH), Earth Syst. Sci. Data, 11, 1203–1237, https://doi.org/10.5194/essd-11-1203-2019, 2019.
Wegmann, M., Gudmundsson, G., and Haeberli, W.:
Permafrost changes in rock walls and the retreat of alpine glaciers: a thermal modelling approach,
Permafrost Periglac.,
9, 23–33, 1998.
Williams, J. G., Rosser, N. J., Hardy, R. J., Brain, M. J., and Afana, A. A.: Optimising 4-D surface change detection: an approach for capturing rockfall magnitude–frequency, Earth Surf. Dynam., 6, 101–119, https://doi.org/10.5194/esurf-6-101-2018, 2018.
WGMS:
Global Glacier Change Bulletin No. 2 (2014–2015),
edited by: Zemp, M., Nussbaumer, S. U., Gärtner-Roer, I., Huber, J., Machguth, H., Paul, F., and Hoelzle, M.,
ICSU(WDS)/IUGG(IACS)/UNEP/UNESCO/WMO, World Glacier Monitoring Service, Zurich, Switzerland, 244 pp., 2017.
Zemp, M., Frey, H., Gärtner-Roer, I., Nussbaumer, S. U., Hoelzle, M., Paul, F., Haeberli, W., Denzinger, F., Ahlstrøm, A. P., Anderson, B., Bajracharya, S., Baroni, C., Braun, L. N., Cáceres, B. E., Casassa, G., Cobos, G., Dávila, L. R., Delgado Granados, H., Demuth, M., Espizua, L., Fischer, A., Fujita, K., Gadek, B., Ghazanfar, A., Hagen, J. O., Holmlund, P., Karimi, N., Li, Z., Pelto, M., Pitte, P., Popovnin, V. V., Portocarrero, C. A., Prinz, R., Sangewar, C. V., Severskiy, I., Sigurđsson, O., Soruco, A., Usubaliev, R., and Vincent, C.:
Historically unprecedented global glacier decline in the early 21st century,
J. Glaciol.,
61, 745–762, 2015.
Short summary
Climate warming is causing significant ice surface lowering even in the uppermost parts of alpine glaciers. Using terrestrial lidar, we quantify rockfall in freshly exposed cirque walls. During 6-year monitoring (2011–2017), an extensive dataset was established and over 600 rockfall events identified. Drastically increased rockfall activity following ice retreat can clearly be observed as 60 % of the rockfall volume detached from less than 10 m above the glacier surface.
Climate warming is causing significant ice surface lowering even in the uppermost parts of...