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A structured approach to enhance flood hazard assessment in mountain streams

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  • B. Mazzorana
  • F. Comiti
  • S. Fuchs

Abstract

An evidence-based flood hazard analysis in mountain streams requires the identification and the quantitative characterisation of multiple possible processes. These processes result from specific triggering mechanisms on the hillslopes (i.e. landslides, debris flows), in-channel morphodynamic processes associated with sudden bed changes and stochastic processes taking place at critical stream configurations (e.g. occlusion of bridges, failure of levees). From a hazard assessment perspective, such possible processes are related to considerable uncertainties underlying the hydrological cause-effect chains. Overcoming these uncertainties still remains a major challenge in hazard and risk assessment and represents a necessary condition for a reliable spatial representation of process intensities and the associated probabilities. As a result of an accurate analysis of the conceptual flaws present in the procedures currently employed for hazard mapping in South Tyrol (Italy) and Carinthia (Austria), we propose a structured approach as a means to enhance the integration of hillslope, morphodynamic and stochastic processes into conventional flood hazard prediction for mountain basins. To this aim, a functional distinction is introduced between prevailing one-dimensional and two-dimensional process propagation domains, i.e., between confined and semi- to unconfined stream segments. The former domains are mostly responsible for the generation of water, sediment and wood fluxes, and the latter are where flooding of inactive channel areas (i.e. alluvial fans, floodplains) can occur. For the 1D process propagation domain, we discuss how to carry out a process routing along the stream system and how to integrate numerical models output with expert judgement in order to derive consistent event scenarios, thus providing a consistent quantification of the input variables needed for the associated 2D domains. Within these latter domains, two main types of spatial sub-domains can be identified based on the predictability of their dynamics, i.e., stochastic and quasi-deterministic. Advantages and limitations offered by this methodology are finally discussed with respect to hazard and risk assessment in mountain basins. Copyright Springer Science+Business Media B.V. 2013

Suggested Citation

  • B. Mazzorana & F. Comiti & S. Fuchs, 2013. "A structured approach to enhance flood hazard assessment in mountain streams," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 67(3), pages 991-1009, July.
  • Handle: RePEc:spr:nathaz:v:67:y:2013:i:3:p:991-1009
    DOI: 10.1007/s11069-011-9811-y
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    References listed on IDEAS

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    4. B. Mazzorana & J. Hübl & A. Zischg & A. Largiader, 2011. "Modelling woody material transport and deposition in alpine rivers," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 56(2), pages 425-449, February.
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    1. Hector Diaz & Bruno Mazzorana & Bernhard Gems & Ivan Rojas & Nicole Santibañez & Pablo Iribarren & Mario Pino & Andrés Iroumé, 2022. "What do biphasic flow experiments reveal on the variability of exposure on alluvial fans and which implications for risk assessment result from this?," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 111(3), pages 3099-3120, April.
    2. Raoof Mostafazadeh & Amir Sadoddin & Abdolreza Bahremand & Vahed Berdi Sheikh & Arash Zare Garizi, 2017. "Scenario analysis of flood control structures using a multi-criteria decision-making technique in Northeast Iran," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 87(3), pages 1827-1846, July.
    3. Liesbet Jacobs & Jan Maes & Kewan Mertens & John Sekajugo & Wim Thiery & Nicole van Lipzig & Jean Poesen & Matthieu Kervyn & Olivier Dewitte, 2016. "Reconstruction of a flash flood event through a multi-hazard approach: focus on the Rwenzori Mountains, Uganda," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 84(2), pages 851-876, November.

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