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Rapport (Rapport De Recherche) Année : 2012

PARAmount - imProved Accessibility: Reliability and safety of Alpine transport infrastructure related to mountainous hazards in a changing climate Decision Support Guidelines (WP7 report) -Version 1.0 -november 2012

Résumé

The need for decision support systems Alpine Space is well endowed with high-level transportation infrastructures, but lacks alternatives in case of temporary or permanent disruption. Due to higher traffic frequency, damage potentials are increasing. In a globalised Alpine Space, a prospering economy depends more and more on permanent connectivity, accessibility and just-in-time transport relations. All Alpine European countries experiment damages caused by natural hazards especially in mountains areas exposed to avalanches, torrent debris flows and rockfalls. Their effects on infrastructures correspond either to direct damages to users (people, vehicles, materials goods), infrastructures (roads, railway tracks, bridges, safety equipment…) or indirect damages related to the linking functions of roads. Risk management decision processes appear as quite complex. Risk managers are in charge of both hazard, vulnerability and risk assessments and also risk reduction measures including structural measures such as protection works or non-structural measures such as land-use control and regulation. In that context, adapted decision-facilitating methods are obliged to face some real-life issues such as lack of knowledge, imperfect available information and also reduced time and budgets for surveys, maintenance, investments etc. Main developments A global framework is proposed before each partner presents his contribution and development. In the framework of the PARAmount project, the partners have proposed contributions to the different steps of the risk management circle corresponding either to early warning or mitigation measures including hazard, risk assessment and protection works efficiency analysis. Section 1 is a global presentation of the PARAmount project goals. Section 2 describes the decision context related to natural risks management. Section 3 describes some developments of the project related to methodologies used in order to identify needs and requirements for decision support systems developments. Section 4 proposes methods to assess indirect vulnerability related to transport function disruption which is a specific feature of risk assessment for roads and railways. The section 5 proposes some innovative tools to help decision-making in a context of imperfect knowledge. The Section 6 deals with a multi-scale approach for decision on a regional scale and section 7 deals with the question of assessment of protection works’ effectiveness. The last section proposes a synthesis of results and some perspectives. Key results and remaining perspectives In the framework of the PARAmount project (http://www.paramount-project.eu/), Work Package n°7 has tried to look at the problem of decision-making related to railway and roads management in a new light. While the risk management process remains indeed very complex, two kinds of tools have been proposed to improve methods and expertises. On the one hand, approaches such as hazard and risk assessment, protection works effectiveness based on numerical modelling have been performed by the different partners. Those techniques and methods are obviously valuable tools to help decision-makers and technicians to take decisions related to risk management: they correspond to the application of existing methods to the different national test beds. Those applications have allowed the dissemination of technical and scientific knowledge all over the different countries: as an example, regional approaches for avalanches and rockfalls have been widely applied and used by the different European partners. Through the calculation of the vulnerability and exposure level of roads, many partners have moved from previous sed approaches based only on hazard level to risk level analysis. In many cases, depending on their starting point and past-experience with risk management methods, several steps are still required. and some further developments are still expected after the PARAmount. On the other hand, project partners have proposed some new and interesting developments that can be summarised as follows: •Implementation of existing methods for hazard assessment of wide geographical zones (multi-scale decision-facilitating approaches, from local to regional scale); •Global risk awareness and communication improvement tools (e.g. BFW); •Design of specific decision support systems such as information systems for road networks (e.g. Autonomous Province of Bolzano, Univ. Ljubljana Slovenia) which have increased knowledge about the existing protection measures through specific surveys ; •Regional use of models to assess hazards and risks for railways tracks (OEBB); •Advanced analysis of network structural properties for road importance and criticality assessment ; •Development of advanced decision support methods for multi-criteria decision-making including information imperfection management (Irstea); •Innovative tools and methodologies to assess and consider information imperfection , including uncertainty, in the decision processes (Irstea). All these methods are based on an integrated approach to risk management in mountains. Technical knowledge about phenomena is of course an essential step for effective risk management. At the same time, the experience of the PARAmount project has finally shown that building specific decision-facilitating methods requires both the use of existing ad hoc methods and also close collaboration with decision-makers. This risk dialogue, the capitalisation of knowledge from the stakeholders, the infrastructure managers during the PARAmount project led to an improvement of methods for risk management process in the context of railways and roads.
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hal-03639896 , version 1 (13-04-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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  • HAL Id : hal-03639896 , version 1

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Jean-Marc Tacnet. PARAmount - imProved Accessibility: Reliability and safety of Alpine transport infrastructure related to mountainous hazards in a changing climate Decision Support Guidelines (WP7 report) -Version 1.0 -november 2012. [Research Report] IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture, 2 Rue de la Papeterie, 38402 Saint-Martin-d'Hères. 2012. ⟨hal-03639896⟩

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