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Overwash vulnerability assessment based on long-term washover evolution

Author

Listed:
  • Tiago Garcia
  • Óscar Ferreira
  • Ana Matias
  • João Dias

Abstract

An integrated methodology for evaluation of overwash vulnerability is developed with respect to the historical washover evolution of a barrier island system. Three different aspects of overwash are addressed in the vulnerability indices developed: overwashed shoreline ratio, maximum overwash intrusion recurrence, and complete barrier overwash. The indices were applied to the barriers in the Ria Formosa system in Southern Portugal using an aerial photography catalogue covering the period 1947–2001. Historical trends of washover evolution were observed to be different between the barriers analysed, but generally, there was a decrease in washover number and dimensions throughout the analysed period. The final overwash diagnostic obtained allowed an integrated overwash vulnerability rating to be defined for each barrier, with vulnerabilities ranging from low to extreme. The methodology has produced results that may assist coastal managers with information concerning barrier island system overwash hazard, define the temporal and geographical distributions of overwash, and provide indications as to where overwash is most likely to occur in the future. Copyright Springer Science+Business Media B.V. 2010

Suggested Citation

  • Tiago Garcia & Óscar Ferreira & Ana Matias & João Dias, 2010. "Overwash vulnerability assessment based on long-term washover evolution," 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. 54(2), pages 225-244, August.
    • Handle: RePEc:spr:nathaz:v:54:y:2010:i:2:p:225-244
    DOI: 10.1007/s11069-009-9463-3
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    Cited by:

    1. Laura Río & F. Gracia, 2013. "Error determination in the photogrammetric assessment of shoreline changes," 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. 65(3), pages 2385-2397, February.

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