Articles | Volume 10, issue 6
https://doi.org/10.5194/esurf-10-1303-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-10-1303-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Dec 2022
Research article |
| 22 Dec 2022
| 22 Dec 2022
Modeling deadwood for rockfall mitigation assessments in windthrow areas
Adrian Ringenbach
CORRESPONDING AUTHOR
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zurich, 8092 Zurich, Switzerland
Peter Bebi
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
Perry Bartelt
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
Andreas Rigling
Swiss Federal Institute for Forest, Snow and Landscape Research WSL, 8903 Birmensdorf, Switzerland
Department of Environmental Systems Science, Institute of Terrestrial Ecosystems, ETH Zurich, 8092 Zurich, Switzerland
Marc Christen
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
Yves Bühler
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
Andreas Stoffel
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
Andrin Caviezel
Climate Change, Extremes and Natural Hazards in Alpine Regions Research Center CERC, 7260 Davos Dorf, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
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Benjamin Walter, Hendrik Huwald, Josué Gehring, Yves Bühler, and Michael Lehning
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Emanuele Marchetti, Alec van Herwijnen, Marc Christen, Maria Cristina Silengo, and Giulia Barfucci
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Jürg Schweizer, Christoph Mitterer, Frank Techel, Andreas Stoffel, and Benjamin Reuter
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Snow avalanches represent a major natural hazard in seasonally snow-covered mountain regions around the world. To avoid periods and locations of high hazard, avalanche warnings are issued by public authorities. In these bulletins, the hazard is characterized by a danger level. Since the danger levels are not well defined, we analyzed a large data set of avalanches to improve the description. Our findings show discrepancies in present usage of the danger scale and show ways to improve the scale.
Yves Bühler, Elisabeth D. Hafner, Benjamin Zweifel, Mathias Zesiger, and Holger Heisig
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Andrin Caviezel, Sophia E. Demmel, Adrian Ringenbach, Yves Bühler, Guang Lu, Marc Christen, Claire E. Dinneen, Lucie A. Eberhard, Daniel von Rickenbach, and Perry Bartelt
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Yves Bühler, Daniel von Rickenbach, Andreas Stoffel, Stefan Margreth, Lukas Stoffel, and Marc Christen
Nat. Hazards Earth Syst. Sci., 18, 3235–3251, https://doi.org/10.5194/nhess-18-3235-2018, https://doi.org/10.5194/nhess-18-3235-2018, 2018
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Andrin Caviezel and Werner Gerber
Nat. Hazards Earth Syst. Sci., 18, 3145–3151, https://doi.org/10.5194/nhess-18-3145-2018, https://doi.org/10.5194/nhess-18-3145-2018, 2018
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Perry Bartelt, Andrin Caviezel, Sandro Degonda, and Othmar Buser
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2018-154, https://doi.org/10.5194/nhess-2018-154, 2018
Revised manuscript not accepted
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C. Mulsow, R. Kenner, Y. Bühler, A. Stoffel, and H.-G. Maas
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2, 739–744, https://doi.org/10.5194/isprs-archives-XLII-2-739-2018, https://doi.org/10.5194/isprs-archives-XLII-2-739-2018, 2018
Alejandro Casteller, Thomas Häfelfinger, Erika Cortés Donoso, Karen Podvin, Dominik Kulakowski, and Peter Bebi
Nat. Hazards Earth Syst. Sci., 18, 1173–1186, https://doi.org/10.5194/nhess-18-1173-2018, https://doi.org/10.5194/nhess-18-1173-2018, 2018
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Natural hazards such as snow avalanches, debris flows and volcanic activity represent a risk to mountain communities. This is particularly the case where documentary records about these processes are rare. As a result, decisions on risk management and land-use planning are based on other sources such tree-ring data and process models. Our study was conducted at Valle Las Trancas in Chile, where we evaluated the dynamics of avalanches and other natural hazards which threaten its population.
Cesar Vera Valero, Nander Wever, Marc Christen, and Perry Bartelt
Nat. Hazards Earth Syst. Sci., 18, 869–887, https://doi.org/10.5194/nhess-18-869-2018, https://doi.org/10.5194/nhess-18-869-2018, 2018
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Snow avalanche motion is strongly dependent on the temperature and water content of the snow cover. In this paper we use a snow cover model, driven by measured meteorological data, to set the initial and boundary conditions for wet-snow avalanche calculations. The snow cover model provides estimates of snow depth, density, temperature and liquid water content. These initial conditions are used to drive an avalanche dynamics model. The runout results are compared using a contigency analysis.
Perry Bartelt, Peter Bebi, Thomas Feistl, Othmar Buser, and Andrin Caviezel
Nat. Hazards Earth Syst. Sci., 18, 759–764, https://doi.org/10.5194/nhess-18-759-2018, https://doi.org/10.5194/nhess-18-759-2018, 2018
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We study how short duration powder avalanche blasts break and overturn tall trees. Tree blow-down is often used to back-calculate avalanche pressure and therefore constrain avalanche flow velocity and motion. We find that tall trees are susceptible to avalanche air blasts because the duration of the air blast is near to the period of vibration of tall trees. Dynamic magnification factors should therefore be considered when back-calculating powder avalanche impact pressures.
Karolina Korzeniowska, Yves Bühler, Mauro Marty, and Oliver Korup
Nat. Hazards Earth Syst. Sci., 17, 1823–1836, https://doi.org/10.5194/nhess-17-1823-2017, https://doi.org/10.5194/nhess-17-1823-2017, 2017
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In this study, we have focused on automatically detecting avalanches and classifying them into release zones, tracks, and run-out zones based on aerial imagery using an object-based image analysis (OBIA) approach. We compared the results with manually mapped avalanche polygons, and obtained a user’s accuracy of > 0.9 and a Cohen’s kappa of 0.79–0.85. Testing the method for a larger area of 226.3 km2, we estimated producer’s and user’s accuracies of 0.61 and 0.78, respectively.
Florian Frank, Brian W. McArdell, Nicole Oggier, Patrick Baer, Marc Christen, and Andreas Vieli
Nat. Hazards Earth Syst. Sci., 17, 801–815, https://doi.org/10.5194/nhess-17-801-2017, https://doi.org/10.5194/nhess-17-801-2017, 2017
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This study describes a sensitivity analysis of the RAMMS debris-flow entrainment model, which is intended to help solve problems related to predicting the runout of debris flows. The results indicate that the entrainment model predicts plausible erosion volumes in comparison with field data. These eroded volumes are sensitive to the initial landslide volume, suggesting that this tool may be useful for both reconstruction of historical events and modeling of debris flow scenarios.
Cesar Vera Valero, Nander Wever, Yves Bühler, Lukas Stoffel, Stefan Margreth, and Perry Bartelt
Nat. Hazards Earth Syst. Sci., 16, 2303–2323, https://doi.org/10.5194/nhess-16-2303-2016, https://doi.org/10.5194/nhess-16-2303-2016, 2016
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Simulating medium–small avalanches operationally on a mine service road allows avalanche hazard to be assessed on the mine transportation route. Using accurate data from the snow cover and the avalanche paths, the avalanche dynamic model developed can calculate the avalanche runout distances and snow volumes of the deposits. The model does not predict whether the avalanche is coming or not, but if it comes, the model will predict runout distances and mass of the deposits.
Yves Bühler, Marc S. Adams, Ruedi Bösch, and Andreas Stoffel
The Cryosphere, 10, 1075–1088, https://doi.org/10.5194/tc-10-1075-2016, https://doi.org/10.5194/tc-10-1075-2016, 2016
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We map the distribution of snow depth at two alpine test sites with unmanned aerial system (UAS) data by applying structure-from-motion photogrammetry. In comparison with manual snow depth measurements, we find high accuracies of 7 to 15 cm for the snow depth values. We can prove that photogrammetric measurements on snow-covered terrain are possible. Underlaying vegetation such as bushes and grass leads to an underestimation of snow depth in the range of 10 to 50 cm.
T. Feistl, P. Bebi, M. Christen, S. Margreth, L. Diefenbach, and P. Bartelt
Nat. Hazards Earth Syst. Sci., 15, 1275–1288, https://doi.org/10.5194/nhess-15-1275-2015, https://doi.org/10.5194/nhess-15-1275-2015, 2015
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Snow avalanches break, uproot and overturn trees, causing damage to forests. In this paper, we define avalanche loading cases representing four different avalanche flow regimes: powder, intermittent, dry and wet. Using a numerical model that simulates both powder and wet snow avalanches, we study documented events with forest damage. We find that powder clouds with velocities over 20m/s break tree stems and that quasi-static pressures of wet snow avalanches are much higher than dynamic pressure.
C. Vera Valero, Y. Bühler, and P. Bartelt
Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhessd-3-2883-2015, https://doi.org/10.5194/nhessd-3-2883-2015, 2015
Manuscript not accepted for further review
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Wet snow avalanches can initiate from large fracture slabs or small point releases. Point
release wet snow avalanches can reach dangerous proportions when they initiate on steep and long avalanche paths and entrain warm moist snow. In this paper we investigate the dynamics of point release wet snow avalanches by applying a numerical model to simulate documented case studies on high altitude slopes in the Chilean Andes. The model simulated correctly flow height, velocity and avalanche run out.
Y. Bühler, M. Marty, L. Egli, J. Veitinger, T. Jonas, P. Thee, and C. Ginzler
The Cryosphere, 9, 229–243, https://doi.org/10.5194/tc-9-229-2015, https://doi.org/10.5194/tc-9-229-2015, 2015
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We are able to map snow depth over large areas ( > 100km2) using airborne digital photogrammetry. Digital photogrammetry is more economical than airborne Laser Scanning but slightly less accurate. Comparisons to independent snow depth measurements reveal an accuracy of about 30cm. Spatial continuous mapping of snow depth is a major step forward compared to point measurements usually applied today. Limitations are steep slopes (> 50°) and areas covered by trees and scrubs.
T. Grünewald, Y. Bühler, and M. Lehning
The Cryosphere, 8, 2381–2394, https://doi.org/10.5194/tc-8-2381-2014, https://doi.org/10.5194/tc-8-2381-2014, 2014
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Elevation dependencies of snow depth are analysed based on snow depth maps obtained from airborne remote sensing. Elevation gradients are characterised by a specific shape: an increase of snow depth with elevation is followed by a distinct peak at a certain level and a decrease in the highest elevations. We attribute this shape to an increase of precipitation with altitude, which is modified by topographical-induced redistribution processes of the snow on the ground (wind, gravitation).
M. Teich, J.-T. Fischer, T. Feistl, P. Bebi, M. Christen, and A. Grêt-Regamey
Nat. Hazards Earth Syst. Sci., 14, 2233–2248, https://doi.org/10.5194/nhess-14-2233-2014, https://doi.org/10.5194/nhess-14-2233-2014, 2014
A. Aydin, Y. Bühler, M. Christen, and I. Gürer
Nat. Hazards Earth Syst. Sci., 14, 1145–1154, https://doi.org/10.5194/nhess-14-1145-2014, https://doi.org/10.5194/nhess-14-1145-2014, 2014
Y. Bühler, S. Kumar, J. Veitinger, M. Christen, A. Stoffel, and Snehmani
Nat. Hazards Earth Syst. Sci., 13, 1321–1335, https://doi.org/10.5194/nhess-13-1321-2013, https://doi.org/10.5194/nhess-13-1321-2013, 2013
Related subject area
Cross-cutting themes: Impacts of climate change on Earth surface dynamics
Spatially coherent variability in modern orographic precipitation produces asymmetric paleo-glacier extents in flowline models: Olympic Mountains, USA
A 4000-year debris flow record based on amphibious investigations of fan delta activity in Plansee (Austria, Eastern Alps)
Biophysical controls of marsh soil shear strength along an estuarine salinity gradient
Current glacier recession causes significant rockfall increase: the immediate paraglacial response of deglaciating cirque walls
Temperature effects on the spatial structure of heavy rainfall modify catchment hydro-morphological response
Detection and explanation of spatiotemporal patterns in Late Cenozoic palaeoclimate change relevant to Earth surface processes
Estimates of late Cenozoic climate change relevant to Earth surface processes in tectonically active orogens
Reconstruction of North American drainage basins and river discharge since the Last Glacial Maximum
Vertical movements of frost mounds in subarctic permafrost regions analyzed using geodetic survey and satellite interferometry
Erosional response of an actively uplifting mountain belt to cyclic rainfall variations
Coastal vulnerability of a pinned, soft-cliff coastline – Part I: Assessing the natural sensitivity to wave climate
Andrew A. Margason, Alison M. Anders, Robert J. C. Conrick, and Gerard H. Roe
Earth Surf. Dynam., 11, 849–863, https://doi.org/10.5194/esurf-11-849-2023, https://doi.org/10.5194/esurf-11-849-2023, 2023
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We examine differences in glacier extent in the Olympic Mountains, USA, where modern precipitation in east-facing valleys is only 50 % of that in west-facing valleys. During the Last Glacial Period, there were very small glaciers in the east and very large glaciers in the west. We use climate data and glacier models to show that the modern spatial pattern of precipitation is likely to have been similar during the past glaciation and may be sufficient to explain the asymmetry of glacier extent.
Carolin Kiefer, Patrick Oswald, Jasper Moernaut, Stefano Claudio Fabbri, Christoph Mayr, Michael Strasser, and Michael Krautblatter
Earth Surf. Dynam., 9, 1481–1503, https://doi.org/10.5194/esurf-9-1481-2021, https://doi.org/10.5194/esurf-9-1481-2021, 2021
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This study provides amphibious investigations of debris flow fans (DFFs). We characterize active DFFs, combining laser scan and sonar surveys at Plansee. We discover a 4000-year debris flow record in sediment cores, providing evidence for a 7-fold debris flow frequency increase in the 20th and 21st centuries, coincident with 2-fold enhanced rainstorm activity in the northern European Alps. Our results indicate climate change as being the main factor controlling debris flow activity.
Megan N. Gillen, Tyler C. Messerschmidt, and Matthew L. Kirwan
Earth Surf. Dynam., 9, 413–421, https://doi.org/10.5194/esurf-9-413-2021, https://doi.org/10.5194/esurf-9-413-2021, 2021
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We measured the shear strength of marsh soils along an estuarine salinity gradient to determine salinity's influence on marsh erodibility. Our work is one of the first studies to directly examine the relationship between salinity and marsh erodibility. We find that an increase in salinity correlates with higher soil shear strength values, indicating that salt marshes may be more resistant to erosion. We also show that both belowground biomass and soil properties drive shear strength differences.
Ingo Hartmeyer, Robert Delleske, Markus Keuschnig, Michael Krautblatter, Andreas Lang, Lothar Schrott, and Jan-Christoph Otto
Earth Surf. Dynam., 8, 729–751, https://doi.org/10.5194/esurf-8-729-2020, https://doi.org/10.5194/esurf-8-729-2020, 2020
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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.
Nadav Peleg, Chris Skinner, Simone Fatichi, and Peter Molnar
Earth Surf. Dynam., 8, 17–36, https://doi.org/10.5194/esurf-8-17-2020, https://doi.org/10.5194/esurf-8-17-2020, 2020
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Extreme rainfall is expected to intensify with increasing temperatures, which will likely affect rainfall spatial structure. The spatial variability of rainfall can affect streamflow and sediment transport volumes and peaks. The sensitivity of the hydro-morphological response to changes in the structure of heavy rainfall was investigated. It was found that the morphological components are more sensitive to changes in rainfall spatial structure in comparison to the hydrological components.
Sebastian G. Mutz and Todd A. Ehlers
Earth Surf. Dynam., 7, 663–679, https://doi.org/10.5194/esurf-7-663-2019, https://doi.org/10.5194/esurf-7-663-2019, 2019
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We apply machine learning techniques to quantify and explain differences between recent palaeoclimates with regards to factors that are important in shaping the Earth's surface. We find that changes in ice cover, near-surface air temperature and rainfall duration create the most distinct differences. We also identify regions particularly prone to changes in rainfall and temperature-controlled erosion, which will help with the interpretation of erosion rates and geological archives.
Sebastian G. Mutz, Todd A. Ehlers, Martin Werner, Gerrit Lohmann, Christian Stepanek, and Jingmin Li
Earth Surf. Dynam., 6, 271–301, https://doi.org/10.5194/esurf-6-271-2018, https://doi.org/10.5194/esurf-6-271-2018, 2018
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We use a climate model and statistics to provide an overview of regional climates from different times in the late Cenozoic. We focus on tectonically active mountain ranges in particular. Our results highlight significant changes in climates throughout the late Cenozoic, which should be taken into consideration when interpreting erosion rates. We also document the differences between model- and proxy-based estimates for late Cenozoic climate change in South America and Tibet.
Andrew D. Wickert
Earth Surf. Dynam., 4, 831–869, https://doi.org/10.5194/esurf-4-831-2016, https://doi.org/10.5194/esurf-4-831-2016, 2016
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The ice sheets that once spread across northern North America dramatically changed the drainage basin areas and discharges of rivers across the continent. As these ice sheets retreated, starting around 19 500 years ago, they sent meltwater to the oceans, influencing climate and building a geologic record of deglaciation. This record can be used to evaluate ice-sheet reconstructions and build an improved history and understanding of past ice-sheet collapse across North America.
I. Beck, R. Ludwig, M. Bernier, T. Strozzi, and J. Boike
Earth Surf. Dynam., 3, 409–421, https://doi.org/10.5194/esurf-3-409-2015, https://doi.org/10.5194/esurf-3-409-2015, 2015
J. Braun, C. Voisin, A. T. Gourlan, and C. Chauvel
Earth Surf. Dynam., 3, 1–14, https://doi.org/10.5194/esurf-3-1-2015, https://doi.org/10.5194/esurf-3-1-2015, 2015
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We have derived a simple solution to the stream power law equation governing the erosion of rapidly uplifting tectonic areas assuming that rainfall varies as a periodic function of time. We show that the erosional response of this forcing is characterized by an amplification of the resulting erosional flux variations as well as a time lag. We show how this time lag can be important in interpreting several geological observations.
A. Barkwith, C. W. Thomas, P. W. Limber, M. A. Ellis, and A. B. Murray
Earth Surf. Dynam., 2, 295–308, https://doi.org/10.5194/esurf-2-295-2014, https://doi.org/10.5194/esurf-2-295-2014, 2014
Cited articles
Bače, R., Svoboda, M., Pouska, V., Janda, P., and Červenka, J.:
Natural regeneration in Central-European subalpine spruce forests: Which logs
are suitable for seedling recruitment?, Forest Ecol. Manage., 266, 254–262,
https://doi.org/10.1016/j.foreco.2011.11.025, 2012. a
Bourrier, F., Dorren, L. K. A., and Berger, F.: Full Scale Field Tests On Rockfall Impacting Trees Felled Transverse To The Slope, in: Conference
proceedings/12th Congress Interpraevent, edited by: Koboltschnig, G. and
Huebl, J., International Research Society INTERPRAEVENT, Klagenfurt, 643–650, http://www.interpraevent.at/palm-cms/upload_files/Publikationen/Tagungsbeitraege/2012_2_643.pdf (last access: 14 December 2022), 2012. a
Brožová, N., Baggio, T., D'Agostino, V., Bühler, Y., and Bebi,
P.: Multiscale analysis of surface roughness for the improvement of natural
hazard modelling, Nat. Hazards Earth Syst. Sci., 21, 3539–3562,
https://doi.org/10.5194/nhess-21-3539-2021, 2021. a, b, c
Bühler, Y., Adams, M. S., Bösch, R., and Stoffel, A.: Mapping snow
depth in alpine terrain with unmanned aerial systems (UASs): potential and
limitations, The Cryosphere, 10, 1075–1088, https://doi.org/10.5194/tc-10-1075-2016, 2016. a
Bühler, Y., von Rickenbach, D., Stoffel, A., Margreth, S., Stoffel, L., and Christen, M.: Automated snow avalanche release area delineation – validation of existing algorithms and proposition of a new object-based approach for large-scale hazard indication mapping, Nat. Hazards Earth Syst. Sci., 18, 3235–3251, https://doi.org/10.5194/nhess-18-3235-2018, 2018. a
Bühler, Y., Bebi, P., Christen, M., Margreth, S., Stoffel, L., Stoffel, A., Marty, C., Schmucki, G., Caviezel, A., Kühne, R., Wohlwend, S., and Bartelt, P.: Automated avalanche hazard indication mapping on a statewide scale, Nat. Hazards Earth Syst. Sci., 22, 1825–1843, https://doi.org/10.5194/nhess-22-1825-2022, 2022. a
Caduff, M. E., Brožová, N., Kupferschmid, A. D., Krumm, F., and Bebi,
P.: How large-scale bark beetle infestations influence the protective effects
of forest stands against avalanches: A case study in the Swiss Alps, Foerst Ecol. Manage., 514, 120201, https://doi.org/10.1016/j.foreco.2022.120201, 2022. a, b, c, d
Catto, J. L., Ackerley, D., Booth, J. F., Champion, A. J., Colle, B. A., Pfahl, S., Pinto, J. G., Quinting, J. F., and Seiler, C.: The Future of Midlatitude Cyclones, Curr. Clim. Change Rep., 5, 407–420,
https://doi.org/10.1007/s40641-019-00149-4, 2019. a
Caviezel, A., Lu, G., Demmel, S. E., Ringenbach, A., Bühler, Y., Christen, M., and Bartelt, P.: RAMMS::ROCKFALL – a modern 3-dimensional simulation tool calibrated on real world data, in: vol. 19-223, 53rd US rock mechanics/geomechanics symposium, American Rock Mechanics Association,
https://www.dora.lib4ri.ch/wsl/islandora/object/wsl:22147 (last access: 14 December 2022), 2019a. a
Caviezel, A., Demmel, S. E., Ringenbach, A., Bühler, Y., Lu, G., Christen, M., Dinneen, C. E., Eberhard, L. A., von Rickenbach, D., and Bartelt, P.: Reconstruction of four-dimensional rockfall trajectories using remote sensing and rock-based accelerometers and gyroscopes, Earth Surf. Dynam., 7, 199–210, https://doi.org/10.5194/esurf-7-199-2019, 2019b. a
Caviezel, A., Ringenbach, A., Demmel, S. E., Dinneen, C. E., Krebs, N., Bühler, Y., Christen, M., Meyrat, G., Stoffel, A., Hafner, E., Eberhard, L. A., von Rickenbach, D., Simmler, K., Mayer, P., Niklaus, P. S., Birchler, T., Aebi, T., Cavigelli, L., Schaffner, M., Rickli, S., Schnetzler, C., Magno, M., Benini, L., and Bartelt, P.: The relevance of rock shape over mass–implications for rockfall hazard assessments, Nat. Commun., 12, 15, https://doi.org/10.1038/s41467-021-25794-y, 2021. a
Costa, M., Marchi, N., Bettella, F., Bolzon, P., Berger, F., and Lingua, E.:
Biological Legacies and Rockfall: The Protective Effect of a Windthrown
Forest, Forests, 12, 1141, https://doi.org/10.3390/f12091141, 2021. a
Dorren, L. K. A.: Rockyfor3D: Description of the complete 3D rockfall model, https://www.ecorisq.org/docs/Rockyfor3D_v5_2_EN.pdf (last access: 14 December 2022), 2016. a
Dorren, L. K. A. and Berger, F.: Stem breakage of trees and energy dissipation during rockfall impacts, Tree Physiol., 26, 63–71,
https://doi.org/10.1093/treephys/26.1.63, 2005. a, b, c, d
Dorren, L. K. A., Berger, F., Le Hir, C., Mermin, E., and Tardif, P.:
Mechanisms, effects and management implications of rockfall in forests,
Forest Ecol. Manage., 215, 183–195, https://doi.org/10.1016/j.foreco.2005.05.012, 2005. a
Dupire, S., Bourrier, F., Monnet, J.-M., Bigot, S., Borgniet, L., Berger, F.,
and Curt, T.: Novel quantitative indicators to characterize the protective
effect of mountain forests against rockfall, Ecol. Indic., 67, 98–107,
https://doi.org/10.1016/j.ecolind.2016.02.023, 2016. a
Dupire, S., Toe, D., Barré, J.-B., Bourrier, F., and Berger, F.: Harmonized mapping of forests with a protection function against rockfalls over European Alpine countries, Appl. Geogr., 120, 102221,
https://doi.org/10.1016/j.apgeog.2020.102221, 2020. a
ETAG 027: Guidline for European Technical Approval of Falling Rock
Protection Kits, https://www.eota.eu/en-GB/content/etags-used-as-ead/26/ (last access: 27 February 2018), 2013.
Feser, F., Barcikowska, M., Krueger, O., Schenk, F., Weisse, R., and Xia, L.:
Storminess over the North Atlantic and northwestern Europe – A review, Q. J. Roy. Meteorol. Soc., 141, 350–382, https://doi.org/10.1002/qj.2364, 2015. a
Frey, W. and Thee, P.: Avalanche protection of windthrow areas: A ten year
comparison of cleared and uncleared starting zones, For. Snow Landsc. Res., 77, 89–107, 2002. a
Fuhr, M., Bourrier, F., and Cordonnier, T.: Protection against rockfall along a maturity gradient in mountain forests, Forest Ecol. Manage., 354, 224–231,
https://doi.org/10.1016/j.foreco.2015.06.012, 2015. a
Gottschalk, S., Lin, M. C., and Manocha, D.: OBBTree: A Hierarchical Structure for Rapid Interference Detection, in: Proceedings of 23rd International Conference on Computer Graphics and Interactive Techniques (SIGGRAPH'96), New Orleans, 171–180,
https://dl.acm.org/doi/pdf/10.1145/237170.237244 (last access: 14 December 2022), 1996. a
Hararuk, O., Kurz, W. A., and Didion, M.: Dynamics of dead wood decay in Swiss forests, Forest Ecosyst., 7, 770, https://doi.org/10.1186/s40663-020-00248-x, 2020. a
Harsch, M. A., Hulme, P. E., McGlone, M. S., and Duncan, R. P.: Are treelines
advancing? A global meta-analysis of treeline response to climate warming,
Ecol. Lett., 12, 1040–1049, https://doi.org/10.1111/j.1461-0248.2009.01355.x, 2009. a
IMIS: IMIS-Windstation “Schwander Grat”,
https://stationdocu.slf.ch/pdf/IMIS_GLA1_DE.pdf, last access: 26 February 2022. a
Jahn, J.: Entwaldung und Steinschlag, in: Schutz des Lebensraumes vor Hochwasser, Muren und Lawinen, Hochwasserbekämpfung Kärnten, Kärnten, 185–198, http://www.interpraevent.at/palm-cms/upload_files/Publikationen/Tagungsbeitraege/1988_1_185.pdf (last access: 20 December 2022), 1988. a
Jain, P., Tye, M. R., Paimazumder, D., and Flannigan, M.: Downscaling fire
weather extremes from historical and projected climate models, Climatic
Change, 163, 189–216, https://doi.org/10.1007/s10584-020-02865-5, 2020. a
Jönsson, A. M., Appelberg, G., Harding, S., and Bärring, L.:
Spatio-temporal impact of climate change on the activity and voltinism of the
spruce bark beetle, Ips typographus, Global Change Biol., 15, 486–499,
https://doi.org/10.1111/j.1365-2486.2008.01742.x, 2009. a
Kalberer, M., Ammann, M., and Jonsson, M.: Mechanische Eigenschaften der
Fichte: Experimente zur Analyse von Naturgefahren | Mechanical properties of Norway spruce: Experiments for the analysis of natural hazards, Schweiz. Z. Forstwesen, 158, 166–175, https://doi.org/10.3188/szf.2007.0166, 2007. a
Kulakowski, D., Seidl, R., Holeksa, J., Kuuluvainen, T., Nagel, T. A.,
Panayotov, M., Svoboda, M., Thorn, S., Vacchiano, G., Whitlock, C., Wohlgemuth, T., and Bebi, P.: A walk on the wild side: Disturbance dynamics
and the conservation and management of European mountain forest ecosystems,
Forest Ecol. Manage., 388, 120–131, https://doi.org/10.1016/j.foreco.2016.07.037, 2017. a
Kupferschmid Albisetti, A. D., Brang, P., Schönenberger, W., and Bugmann,
H.: Decay of Picea abies snag stands on steep mountain slopes, Forest Chron.,
79, 247–252, https://doi.org/10.5558/tfc79247-2, 2003. a, b, c
Lachat, T., Bouget, C., Bütler, R., and Müller, J.: Deadwood:
quantitative and qualitative requirements for the conservation of saproxylic
biodiversity, in: Integrative approaches as an opportunity for the conservation of forest biodiversity, edited by: Kraus, D. and Krumm, F.,
92–103, ISBN 978-952-5980-06-6, 2013. a, b
Lanfranconi, C., Sala, G., Frattini, P., Crosta, G. B., and Valagussa, A.:
Assessing the rockfall protection efficiency of forests at the regional scale, Landslides, 17, 2703–2721, https://doi.org/10.1007/s10346-020-01458-8, 2020. a
Leine, R. I., Schweizer, A., Christen, M., Glover, J., Bartelt, P., and Gerber, W.: Simulation of rockfall trajectories with consideration of rock shape, Multibody Syst. Dynam., 32, 241–271, https://doi.org/10.1007/s11044-013-9393-4, 2014. a, b, c, d
Leine, R. I., Capobianco, G., Bartelt, P., Christen, M., and Caviezel, A.:
Stability of rigid body motion through an extended intermediate axis theorem:
application to rockfall simulation, Multibody Syst. Dynam., 79, 444,
https://doi.org/10.1007/s11044-021-09792-y, 2021. a
Liu, G. and Li, J.: Research on the Effect of Tree Barriers on Rockfall Using a Three-Dimensional Discontinuous Deformation Analysis Method, Int. J. Comput. Meth., 28, 1950046, https://doi.org/10.1142/S0219876219500464, 2019. a
Loye, A., Jaboyedoff, M., and Pedrazzini, A.: Identification of potential
rockfall source areas at a regional scale using a DEM-based geomorphometric
analysis, Nat. Hazards Earth Syst. Sci., 9, 1643–1653,
https://doi.org/10.5194/nhess-9-1643-2009, 2009. a
Lu, G., Caviezel, A., Christen, M., Demmel, S. E., Ringenbach, A., Bühler, Y., Dinneen, C. E., Gerber, W., and Bartelt, P.: Modelling rockfall impact with scarring in compactable soils, Landslides, 64, 2353–2367, https://doi.org/10.1007/s10346-019-01238-z, 2019. a, b, c
Lu, G., Ringenbach, A., Caviezel, A., Sanchez, M., Christen, M., and Bartelt,
P.: Mitigation effects of trees on rockfall hazards: does rock shape matter?,
Landslides, 50, 1689, https://doi.org/10.1007/s10346-020-01418-2, 2020. a, b, c, d
Lundström, T., Jonsson, M. J., Volkwein, A., and Stoffel, M.: Reactions and energy absorption of trees subject to rockfall: a detailed assessment using a new experimental method, Tree Physiol., 29, 345–359,
https://doi.org/10.1093/treephys/tpn030, 2009. a
Maringer, J., Ascoli, D., Dorren, L., Bebi, P., and Conedera, M.: Temporal
trends in the protective capacity of burnt beech forests (Fagus sylvatica L.)
against rockfall, Eur. J. Forest Res., 135, 657–673, https://doi.org/10.1007/s10342-016-0962-y, 2016. a, b
Marty, M.: Lawinenschutz und Waldentwicklung auf der Windwurffläche
Disentis 29 Jahre nach Vivian, bachelor-thesis, ZHAW, Wädenswil,
https://doi.org/10.21256/zhaw-19274, 2019. a
Moemken, J., Reyers, M., Feldmann, H., and Pinto, J. G.: Future Changes of Wind Speed and Wind Energy Potentials in EURO-CORDEX Ensemble Simulations, J.
Geophys. Res.-Atmos., 123, 6373–6389, https://doi.org/10.1029/2018JD028473, 2018. a
Monnet, J.-M., Bourrier, F., Dupire, S., and Berger, F.: Suitability of
airborne laser scanning for the assessment of forest protection effect
against rockfall, Landslides, 14, 299–310, https://doi.org/10.1007/s10346-016-0687-5,
2017. a
Moos, C., Thomas, M., Pauli, B., Bergkamp, G., Stoffel, M., and Dorren, L.:
Economic valuation of ecosystem-based rockfall risk reduction considering
disturbances and comparison to structural measures, Sci. Total Environ., 697,
134077, https://doi.org/10.1016/j.scitotenv.2019.134077, 2019. a
Moos, C., Khelidj, N., Guisan, A., Lischke, H., and Randin, C. F.: A
quantitative assessment of rockfall influence on forest structure in the
Swiss Alps, Eur. J. Forest Res., 10, 578, https://doi.org/10.1007/s10342-020-01317-0, 2020. a
Mozny, M., Trnka, M., and Brázdil, R.: Climate change driven changes of
vegetation fires in the Czech Republic, Theor. Appl. Climatol., 143, 691–699, https://doi.org/10.1007/s00704-020-03443-6, 2021. a
Noël, F., Cloutier, C., Jaboyedoff, M., and Locat, J.: Impact-Detection
Algorithm That Uses Point Clouds as Topographic Inputs for 3D Rockfall
Simulations, Geosci. J., 11, 188, https://doi.org/10.3390/geosciences11050188, 2021. a
Olmedo, I., Bourrier, F., Bertrand, D., Berger, F., and Limam, A.: Discrete
element model of the dynamic response of fresh wood stems to impact, Eng. Struct., 120, 13–22, https://doi.org/10.1016/j.engstruct.2016.03.025, 2016. a
Olmedo, I., Bourrier, F., Bertrand, D., Berger, F., and Limam, A.: Dynamic
analysis of wooden rockfall protection structures subjected to impact loading
using a discrete element model, Eur. J. Environ. Civ. Eng., 24, 1430–1449,
https://doi.org/10.1080/19648189.2018.1472042, 2020. a
Pereira, D.: Wind Rose: Graph and table for Direction-Intensity data,
https://ch.mathworks.com/matlabcentral/fileexchange/47248-wind-rose, last access: 27 February 2022. a
Ringenbach, A., Bühler, Y., Stoffel, A., Kronenberg, M., Bebi, P., and
Caviezel, A.: Deadwood Generator, EnviDat [data set], https://doi.org/10.16904/envidat.357, 2022a. a
Ringenbach, A., Stihl, E., Bühler, Y., Bebi, P., Bartelt, P., Rigling, A., Christen, M., Lu, G., Stoffel, A., Kistler, M., Degonda, S., Simmler, K.,
Mader, D., and Caviezel, A.: Full-scale experiments to examine the role of
deadwood in rockfall dynamics in forests, Nat. Hazards Earth Syst. Sci., 22, 2433–2443, https://doi.org/10.5194/nhess-22-2433-2022, 2022b. a, b, c, d
Robbins, B. A., Wibowo, J. L., Holden, K. S., and Corcoran, M. K.: Development of Envelope Curves for Predicting Void Dimensions from Overturned Trees,
https://erdc-library.erdc.dren.mil/jspui/bitstream/11681/10381/1/ERDC-GSL-TR-14-27.pdf
(last access: 14 December 2022), 2014. a
Sandström, J., Bernes, C., Junninen, K., Lõhmus, A., Macdonald, E.,
Müller, J., and Jonsson, B. G.: Impacts of dead wood manipulation on the
biodiversity of temperate and boreal forests. A systematic review, J. Appl.
Ecol., 56, 1770–1781, https://doi.org/10.1111/1365-2664.13395, 2019. a
Sappington, J. M., Longshore, K. M., and Thomson, D. B.: Quantifying Landscape Ruggedness for Animal Habitat Analysis: A Case Study Using Bighorn Sheep in the Mojave Desert, J. Wildlife Manage., 71, 1419–1426, https://doi.org/10.2193/2005-723, 2007.
a
Scheidl, C., Heiser, M., Vospernik, S., Lauss, E., Perzl, F., Kofler, A.,
Kleemayr, K., Bettella, F., Lingua, E., Garbarino, M., Skudnik, M., Trappmann, D., and Berger, F.: Assessing the protective role of alpine
forests against rockfall at regional scale, Eur. J. Forest Res., 11, 969–980, https://doi.org/10.1007/s10342-020-01299-z, 2020. a
Seidl, R., Thom, D., Kautz, M., Martin-Benito, D., Peltoniemi, M., Vacchiano,
G., Wild, J., Ascoli, D., Petr, M., Honkaniemi, J., Lexer, M. J., Trotsiuk,
V., Mairota, P., Svoboda, M., Fabrika, M., Nagel, T. A., and Reyer, C. P. O.:
Forest disturbances under climate change, Nat. Clim. Change, 7, 395–402,
https://doi.org/10.1038/nclimate3303, 2017. a, b, c, d
Shorohova, E. and Kapitsa, E.: Stand and landscape scale variability in the
amount and diversity of coarse woody debris in primeval European boreal
forests, Forest Ecol. Manage., 356, 273–284, https://doi.org/10.1016/j.foreco.2015.07.005, 2015. a
Sneed, E. D. and Folk, R. L.: Pebbles in the lower Colorado River, Texas, study in particle morfogenesis, J. Geol., 66, 114–150, 1958. a
Stadelmann, G., Bugmann, H., Wermelinger, B., and Bigler, C.: Spatial
interactions between storm damage and subsequent infestations by the European
spruce bark beetle, Forest Ecol. Manage., 318, 167–174,
https://doi.org/10.1016/j.foreco.2014.01.022, 2014. a
Stoffel, M., Wehrli, A., Kühne, R., Dorren, L. K. A., Perret, S., and
Kienholz, H.: Assessing the protective effect of mountain forests against
rockfall using a 3D simulation model, Forest Ecol. Manage., 225, 113–122,
https://doi.org/10.1016/j.foreco.2005.12.030, 2006. a
Stritih, A., Senf, C., Seidl, R., Grêt-Regamey, A., and Bebi, P.: The
impact of land-use legacies and recent management on natural disturbance
susceptibility in mountain forests, Forest Ecol. Manage., 484, 118950,
https://doi.org/10.1016/j.foreco.2021.118950, 2021. a, b
swisstopo: swissALTI3D: Das hoch aufgelöste Terrainmodell der Schweiz,
https://www.swisstopo.admin.ch/content/swisstopo-internet/de/geodata/height/alti3d/_jcr_content/contentPar/tabs_copy/items/dokumente/tabPar/downloadlist/downloadItems/846_1464690554132.download/swissALTI3D_detaillierte Produktinfo_201802_DE.pdf (last access: 11 August 2021), 2018. a, b
Wohlgemuth, T., Schwitter, R., Bebi, P., Sutter, F., and Brang, P.:
Post-windthrow management in protection forests of the Swiss Alps, Eur. J. Forest Res., 136, 1029–1040, https://doi.org/10.1007/s10342-017-1031-x, 2017. a
Short summary
The presented automatic deadwood generator (ADG) allows us to consider deadwood in rockfall simulations in unprecedented detail. Besides three-dimensional fresh deadwood cones, we include old woody debris in rockfall simulations based on a higher compaction rate and lower energy absorption thresholds. Simulations including different deadwood states indicate that a 10-year-old deadwood pile has a higher protective capacity than a pre-storm forest stand.
The presented automatic deadwood generator (ADG) allows us to consider deadwood in rockfall...
