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Long-term analysis of rainfall-induced landslides in Umbria, central Italy

Author

Listed:
  • S. L. Gariano

    (CNR IRPI)

  • G. Verini Supplizi

    (University of Perugia)

  • F. Ardizzone

    (CNR IRPI)

  • P. Salvati

    (CNR IRPI)

  • C. Bianchi

    (CNR IRPI)

  • R. Morbidelli

    (University of Perugia)

  • C. Saltalippi

    (University of Perugia)

Abstract

Analyses of historical records of landslides and climate variables are useful tools to search for correlations between damaging landslide events and their triggers. In this work, we investigate the temporal and geographical relationships between two long-term historical series of catalogued landslide occurrences and daily rainfall data in Umbria, a central Italian region, from 1928 to 2001. Moreover, we search for changes in the frequency and density of landslides, and in the characteristics of the associated rainfall events. Using a consolidated approach, partially modified, we find that the rainfall events that have produced rainfall-induced landslides in Umbria changed in space and time during observation period and between two considered sub-periods (1928–1975 and 1976–2001). In particular, we find that: (i) the monthly distribution of landslides associated with rainfall events is quite different than that of all landslides in the regional catalogue; (ii) the spatial and temporal distribution of REL changed from the older (most events occurred in winter) to the recent period (most events occurred in autumn); (iii) the recent most rainfall events associated with landslides are characterized by a lower cumulated rainfall and a shorter duration, sign of an increased propensity of the regional territory to produce landslides over time.

Suggested Citation

  • S. L. Gariano & G. Verini Supplizi & F. Ardizzone & P. Salvati & C. Bianchi & R. Morbidelli & C. Saltalippi, 2021. "Long-term analysis of rainfall-induced landslides in Umbria, central Italy," 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. 106(3), pages 2207-2225, April.
    • Handle: RePEc:spr:nathaz:v:106:y:2021:i:3:d:10.1007_s11069-021-04539-6
    DOI: 10.1007/s11069-021-04539-6
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    References listed on IDEAS

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    1. M. Polemio & T. Lonigro, 2015. "Trends in climate, short-duration rainfall, and damaging hydrogeological events (Apulia, Southern Italy)," 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. 75(1), pages 515-540, January.
    2. Stefano Luigi Gariano & Massimo Melillo & Silvia Peruccacci & Maria Teresa Brunetti, 2020. "How much does the rainfall temporal resolution affect rainfall thresholds for landslide triggering?," 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. 100(2), pages 655-670, January.
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