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Reanalysing strong-convective wind damage paths using high-resolution aerial images

Author

Listed:
  • Oriol Rodríguez

    (University of Barcelona, Barcelona)

  • Joan Bech

    (University of Barcelona, Barcelona)

Abstract

High-resolution aerial imagery may provide very detailed information about strong-convective wind events, which can be very useful to enhance and make more robust severe weather databases. Through an aerial analysis, unknown affected areas can be unveiled, large damaged zones or complex terrain events can be mapped, and in situ damage surveys can be completed. Comparing aerial orthophotographs or high-resolution satellite imagery taken before and after the event, damage to forest associated with EF1 + intensities rated with the Enhanced Fujita scale is easily observable. It is also possible to detect repaired parts on some types of roofs and buildings due to the occurrence of weak events and major damage on human-made structures in case of significant episodes. To illustrate the added value of using orthophotographs in forensic damage survey analysis, the 2 November 2008 strong-convective wind event in Catalonia (NE Iberian Peninsula) is revisited. Confirming previous studies, two different damage swaths, associated with the passage of two supercells during the early morning, are clearly identified in high-resolution aerial images. The additional information provided by orthophotograph analysis allowed extending the two damage paths and increasing the damage intensity of the event. It is concluded that both damage tracks are related to tornadoes, which are rated as an EF2 and an EF3, the second being the strongest tornado ever registered in Catalonia, one of the most tornado-prone regions of southern Europe.

Suggested Citation

  • Oriol Rodríguez & Joan Bech, 2020. "Reanalysing strong-convective wind damage paths using high-resolution aerial images," 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. 104(1), pages 1021-1038, October.
    • Handle: RePEc:spr:nathaz:v:104:y:2020:i:1:d:10.1007_s11069-020-04202-6
    DOI: 10.1007/s11069-020-04202-6
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    References listed on IDEAS

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    1. J. F. León-Cruz & N. Carbajal & L. F. Pineda-Martínez, 2019. "The role of complex terrain in the generation of tornadoes in the west of Mexico," 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. 97(1), pages 335-353, May.
    2. Andrey N. Shikhov & Ekaterina S. Perminova & Sergey I. Perminov, 2019. "Satellite-based analysis of the spatial patterns of fire- and storm-related forest disturbances in the Ural region, Russia," 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. 97(1), pages 283-308, May.
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