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Mountain torrents: Quantifying vulnerability and assessing uncertainties.

Reinhold Totschnig1, Sven Fuchs2

  • 1Institute of Mountain Risk Engineering, University of Natural Resources and Life Sciences, Peter-Jordan-Straße 82, 1190 Vienna, Austria; eb&p Umweltbüro GmbH, Bahnhofstraße 39/2, 9020 Klagenfurt, Austria.

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This study develops generalized vulnerability functions for residential buildings impacted by torrent processes. These functions simplify risk assessment for mountain hazards across the European Alps.

Keywords:
European AlpsMountain hazardsQuantitative risk assessmentUncertaintiesValidationVulnerability

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Area of Science:

  • Geosciences
  • Civil Engineering
  • Risk Management

Background:

  • Vulnerability assessment is crucial for risk management of natural hazards.
  • Quantifying building vulnerability to torrent processes requires vulnerability functions.
  • Existing functions are often specific to certain processes and building types.

Purpose of the Study:

  • To extend and generalize existing vulnerability functions for residential buildings affected by torrent processes.
  • To merge data from different torrent processes and building types for broader applicability.
  • To validate the derived functions with independent data and literature.

Main Methods:

  • Utilized nonlinear regression analysis with cumulative distribution functions.
  • Applied statistical tests to merge data from diverse torrent processes and building types.
  • Quantified uncertainty using confidence bands for regression functions.

Main Results:

  • Demonstrated that differentiating between sediment-laden torrent processes is unnecessary for residential building vulnerability assessment.
  • Derived generalized vulnerability functions applicable to various torrent processes.
  • Validated the functions using data from the Italian Alps and existing literature, confirming wider applicability.

Conclusions:

  • The developed vulnerability functions offer a unified approach for assessing residential building risk from torrent processes.
  • These functions enhance risk management strategies for mountain hazards in the European Alps.
  • The methodology is transferable to other mountain regions with available data.