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.
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Rainfall data can be gathered at: http://www.regione.umbria.it/ambiente/servizio-idrografico; http://annali.regione.umbria.it; http://www.acq.isprambiente.it/annalipdf/; http://www.isprambiente.gov.it/en/projects/inland-waters-and-marine-waters/hydrological-yearbooks?set_language=en. Landslide data can be gathered at: http://sici.irpi.cnr.it/
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Acknowledgements
This work has been written starting from the master thesis of Giulia Verini Supplizi in Civil Engineering, entitled “Interazione tra precipitazioni e movimenti franosi: un'analisi di serie storiche per la regione Umbria”, University of Perugia, Department of Civil and Environmental Engineering, Academic year 2017/2018. The manuscript benefited from the constructive comments of two anonymous reviewers.
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Gariano, S.L., Verini Supplizi, G., Ardizzone, F. et al. Long-term analysis of rainfall-induced landslides in Umbria, central Italy. Nat Hazards 106, 2207–2225 (2021). https://doi.org/10.1007/s11069-021-04539-6
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DOI: https://doi.org/10.1007/s11069-021-04539-6