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Discussion papers
https://doi.org/10.5194/nhess-2019-208
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-208
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 10 Jul 2019

Submitted as: research article | 10 Jul 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Evaluation of a model for mapping intense pluvial runoff hazard using proxy data of runoff-related impacts. Application to the railway context

Isabelle Braud1, Lilly-Rose Lagadec2,1,3, Loïc Moulin3, Blandine Chazelle4, and Pascal Breil1 Isabelle Braud et al.
  • 1Irstea, UR RiverLy, Lyon-Villeurbanne Center, 5 Rue de la Doua, CS 20244, 69625 Villeurbanne cédex, France
  • 2SNCF Réseau (French Railway Company), Engineering and Projects South-West, PIEG General Studies, 54 bis rue Amédée Saint Germain, 33077 Bordeaux, France
  • 3SNCF Réseau (French Railway Company), Engineering & Projects Direction, Railways, Tracks & Environment Department, 6 avenue Francois Mitterrand, 93210 La-Plaine-Saint-Denis, France
  • 4SNCF Réseau (French Railway Company), Engineering and Projects South-East, General Studies, 31 Avenue Albert-et-Elisabeth, 63037 Clermont-Ferrand Cedex, France

Abstract. The IRIP method, for Indicator of intense pluvial runoff, in French, is a geomatics method which allows mapping the susceptibility of territory to surface runoff and that provides three maps of susceptibility to the generation, transfer and accumulation of runoff. It is based on the combination of binary maps that represent the impact of a given factor (favourable or not favourable) to runoff. These factors are summed up to provide susceptibility maps to runoff with levels ranging from 0 to 5. To be used for risk prevention, the quality and limitations of the produced maps must be assessed. However, runoff data are very scarce and not available everywhere in a territory. Proxy data of impacts related to runoff can provide information useful for the evaluation of the IRIP maps. However, both information cannot be compared directly and a specific methodology to compare susceptibility maps and proxy data must be proposed. This paper presents such a method that accounts for the hazard level, the vulnerability of the study area and possible mitigation actions taken to reduce the risk. The evaluation method is assessed using runoff-related impacts on railways as proxy data to compare with the maps. The evaluation is made on a 80 km railway line in Normandy (North of France), where a comprehensive database of runoff-related impacts on the railway has been gathered over the whole 20th century. The results show that the evaluation method is robust and relevant. The comparison with runoff-related impacts on the railway also shows that the susceptibility maps produced by the IRIP model provide relevant information related to runoff and that they can be used to design risk management strategies, as illustrated in the railway context.

Isabelle Braud et al.
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Short summary
A method for the evaluation of a model that maps the susceptibility of a territory to surface runoff is presented. It is based on proxy data of localized impacts related to runoff. It accounts for the hazard level, the vulnerability of the study area and possible mitigation actions taken to reduce the risk. The evaluation is made on a 80 km railway line in Normandy (North of France), where a comprehensive database of runoff-related impacts on the railway has been gathered over the 20th century.
A method for the evaluation of a model that maps the susceptibility of a territory to surface...
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