Preprints
https://doi.org/10.5194/nhess-2024-46
https://doi.org/10.5194/nhess-2024-46
08 Apr 2024
 | 08 Apr 2024
Status: this preprint is currently under review for the journal NHESS.

Regional-scale analysis of weather-related rockfall triggering mechanisms in Norway, and its sensitivity to climate change

Rosa M. Palau, Kjersti Gleditsch Gisnås, Anders Solheim, and Graham Lewis Gilbert

Abstract. This paper evaluates the relation between rockfall events and weather conditions for two regions in Norway – Romsdalen and Gudbrandsdalen and explores how rockfall frequency might change with future climate conditions. Our analysis focuses on understanding the relationship between rockfall occurrence and effective water inputs, including rainfall and snow melt, and temperature oscillations both in cold conditions (freeze-thaw cycles) and in warm conditions (hot-cold cycles). To accomplish this, regional weather data and rockfall information in the Norwegian Mass Movement Database have been employed. Our results indicate that temperature oscillations might be better suited than effective water input to depict the occurrence of rockfalls in the two study areas in Norway. Freeze-thaw cycles are most frequent during winter and spring, and hot-cold cycles are most frequent during summer. Climate change will affect rockfall seasonality and the frequency in which freeze-thaw cycles and hot-cold cycles are observed. Thus, altering the exposure of population and infrastructures to rockfalls.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Rosa M. Palau, Kjersti Gleditsch Gisnås, Anders Solheim, and Graham Lewis Gilbert

Status: open (until 01 Jun 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2024-46', Anonymous Referee #1, 26 Apr 2024 reply
  • RC2: 'Comment on nhess-2024-46 - Major revisions needed', Anonymous Referee #2, 22 May 2024 reply
Rosa M. Palau, Kjersti Gleditsch Gisnås, Anders Solheim, and Graham Lewis Gilbert
Rosa M. Palau, Kjersti Gleditsch Gisnås, Anders Solheim, and Graham Lewis Gilbert

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Short summary
This paper looks at the relationship between rockfalls and weather conditions in two regions of Norway. The study explores how often rockfalls occur and how this might change in the future due to climate change. The results indicate that changes in temperature, rather than just heavy rain or snow melt, can have a big impact on the time rockfalls happen. In particular, when temperatures oscillate up and down, rockfalls are observed more often.
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