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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/nhess-2018-234
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2018-234
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Sep 2018

Research article | 26 Sep 2018

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

Integrated risk assessment due to slope instabilities at the roadway network of Gipuzkoa, Basque Country

Olga Mavrouli1,a, Jordi Corominas2, Iñaki Ibarbia3, Nahikari Alonso4, Ioseba Jugo3, Jon Ruiz4, Susana Luzuriaga5, and Jose Antonio Navarro5 Olga Mavrouli et al.
  • 1Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, Netherlands
  • 2Department of Civil and Environmental Engineering, Technical University of Catalonia, BarcelonaTech (UPC)
  • 3Ikerlur, S.L., Donostia
  • 4LKS Ingeniería, S. Coop., Arrasate/Mondragon
  • 5Diputación Foral de Gipuzkoa-Gipuzkoako Foru Aldundia, Donostia/San Sebastián
  • apreviously at: Department of Civil and Environmental Engineering, Technical University of Catalonia, BarcelonaTech (UPC)

Abstract. Transportation corridors such as roadways are often subjected to both natural instability and cut slope failure, with substantial physical damage for the road infrastructure and threat to the circulating vehicles and passengers. In the early 2000s, the Gipuzkoa Regional Council of the Basque country in Spain, marked the need for assessing the risk related to the geotechnical hazards at its road network, in order to assess and monitor their safety for the road users. The Quantitative Risk Assessment (QRA) was selected as a powerful tool for comparing the risk for different hazards on an objective basis. Few examples of multi-hazard risk assessment along transportation corridors exist. The methodology presented here consists in the calculation of risk in terms of probability of failure and its respective consequences, and it was applied to 95 selected points of risk (PoR) of the entire road network managed by the Gipuzkoa Regional Council. The types of encountered slope instabilities which are treated are rockfalls, retaining wall failures, slow moving landslides, and coastal erosion induced failures. The proposed methodology includes the calculation of the probability of failure for each hazard based on an extensive collection of local field data and its association with the probability of failure and the expected consequences. Instrumentation data from load cells for the anchored walls and inclinometers for the slow moving landslides were used. The expected consequences were assessed for each hazard level in terms of a fixed Unit Cost, UC. The results indicate that the risk can be comparable for the different hazards. 12% of the PoR in the study area were found to be of very high risk.

Olga Mavrouli et al.
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Short summary
A methodology is proposed for the quantitative risk assessment for roadways subjected to rockfalls, retaining wall failures, slow moving landslides, and coastal erosion induced failures. It includes the calculation of the probability of occurrence of each hazard with a given level, based on an extensive collection of field data, and its association with the consequences. The latter were assessed considering the road damage repair cost for each level, in terms of a fixed Unit Cost.
A methodology is proposed for the quantitative risk assessment for roadways subjected to...
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