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Quantifying historic skew surges: an example for the Dunkirk Area, France

Author

Listed:
  • Nathalie Giloy

    (Institute for Radiological Protection and Nuclear Safety)

  • Yasser Hamdi

    (Institute for Radiological Protection and Nuclear Safety)

  • Lise Bardet

    (Institute for Radiological Protection and Nuclear Safety)

  • Emmanuel Garnier

    (Université de Franche-Comté)

  • Claire-Maire Duluc

    (Institute for Radiological Protection and Nuclear Safety)

Abstract

As instrumental records often cover only short time periods, historical information is the main source of data in order to extend natural disaster catalogs. This study aims to show the feasibility of quantifying extreme sea levels and skew surges during storm events by using historic documentary data. The documentary data related to the extreme events are often not freestanding enough to directly extract water levels and subsequently skew surge levels, and hence auxiliary information such as dike sketches was used to interpret the collected data. First a strategy for the reconstruction of historic levels is presented which implies an analysis on three different scales: (1) the data scale, (2) the quantification scale, and (3) the event scale. Strong hypotheses were made during the quantification processes of the historic water levels and skew surges. Therefore, the methodology also aims to trace the hypotheses taken for the surges reconstruction, to inform potential users about the different degrees of reliability of estimated values. Secondly, this strategy is applied on an existing database of storms and storm surges that occurred in Dunkirk in the north of France, which contains 75 events. Within this database the focus was set on surge events that hit Dunkirk between 1778 and 1846 and seven new skew surges were estimated for that period.

Suggested Citation

  • Nathalie Giloy & Yasser Hamdi & Lise Bardet & Emmanuel Garnier & Claire-Maire Duluc, 2019. "Quantifying historic skew surges: an example for the Dunkirk Area, France," 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. 98(3), pages 869-893, September.
    • Handle: RePEc:spr:nathaz:v:98:y:2019:i:3:d:10.1007_s11069-018-3527-1
    DOI: 10.1007/s11069-018-3527-1
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    References listed on IDEAS

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    1. Aurélie Maspataud & Marie-Hélène Ruz & Stéphane Vanhée, 2013. "Potential impacts of extreme storm surges on a low-lying densely populated coastline: the case of Dunkirk area, Northern France," 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. 66(3), pages 1327-1343, April.
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