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Abstract
Cirque erosion contributes significantly to mountain denudation and is a key element of glaciated mountain topography. Despite long-standing efforts, rates of rockwall retreat and the proportional contributions of low-, mid- and high-magnitude rockfalls have remained poorly constrained. Here, a unique, terrestrial-lidar-derived rockfall inventory (2011–2017) of two glaciated cirques in the Hohe Tauern range, Central Alps, Austria, is analysed. The mean cirque wall retreat rate of 1.9 mm a−1 ranks in the top range of reported values and is mainly driven by enhanced rockfall from the lowermost, freshly deglaciated rockwall sections. Retreat rates are significantly elevated over decades subsequent to glacier downwasting. Elongated cirque morphology and recorded cirque wall retreat rates indicate headward erosion is clearly outpacing lateral erosion, most likely due to the cataclinal backwalls, which are prone to large dip-slope failures. The rockfall magnitude–frequency distribution – the first such distribution derived for deglaciating cirques – follows a distinct negative power law over 4 orders of magnitude. Magnitude–frequency distributions in glacier-proximal and glacier-distal rockwall sections differ significantly due to an increased occurrence of large rockfalls in recently deglaciated areas. In this paper, the second of two companion pieces, we show how recent climate warming shapes glacial landforms, controls spatiotemporal rockfall variation in glacial environments and indicates a transient signal with decadal-scale exhaustion of rockfall activity immediately following deglaciation crucial for future hazard assessments.
Originalsprache | Englisch |
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Seiten (von - bis) | 753–768 |
Seitenumfang | 16 |
Fachzeitschrift | Earth Surface Dynamics |
Jahrgang | 8 |
Ausgabenummer | 3 |
DOIs | |
Publikationsstatus | Veröffentlicht - 11 Sept. 2020 |
Systematik der Wissenschaftszweige 2012
- 105 Geowissenschaften
Projekte
- 1 Abgeschlossen
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GlacierRocks: Glacier-Headwall Interaction and its Influence on Rockfall Activity
Otto, J.-C. (Projektleitung)
1/04/17 → 31/03/20
Projekt: Forschung
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Rockfall, glacier recession, and permafrost degradation: long-term monitoring of climate change impacts at the Open-Air-Lab Kitzsteinhorn, Hohe Tauern
Hartmeyer, I. & Otto, J.-C., 9 Sept. 2024, in: DEUQUA Special Publications. 5, 5, S. 3–12Titel in Übersetzung :Steinschlag, Gletscherschwund und Permafrostdegradation: Langzeitbeobachtung der Auswirkungen des Klimawandels im Open-Air-Lab Kitzsteinhorn, Hohe Tauern Publikation: Beitrag in Fachzeitschrift › Artikel
Open Access -
Current glacier recession causes significant rockfall increase: the immediate paraglacial response of deglaciating cirque walls
Hartmeyer, I., Delleske, R., Keuschnig, M., Krautblatter, M., Lang, A., Schrott, L. & Otto, J.-C., 11 Sept. 2020, in: EARTH SURFACE DYNAMICS. 8, 3, S. 729–751 23 S.Publikation: Beitrag in Fachzeitschrift › Artikel › Peer-reviewed
Open Access -
Paraglacial responses in deglaciating cirque walls: Implications for rockfall magnitudes/frequencies and rockwall retreat
Hartmeyer, I., Delleske, R., Keuschnig, M., Krautblatter, M., Lang, A., Schrott, L. & Otto, J.-C., 23 März 2020Publikation: Andere Beiträge › Sonstiger Beitrag › Forschung