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Open AccessArticle

Seasonal and Event-Based Hydrological and Slope Stability Modeling of Pyroclastic Fall Deposits Covering Slopes in Campania (Southern Italy)

Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), University of Naples Federico II, Complesso Universitario di Monte Sant’Angelo, Via Cinthia, Edificio L1, 80126 Naples, Italy
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Water 2018, 10(9), 1140; https://doi.org/10.3390/w10091140
Received: 26 July 2018 / Revised: 11 August 2018 / Accepted: 20 August 2018 / Published: 25 August 2018
(This article belongs to the Special Issue Landslide Hydrology)
The pyroclastic fall deposits mantling mountain slopes in the Campania region (Southern Italy) represent one of the most studied geomorphological frameworks of the world regarding rainfall-induced debris flows threating urban areas. The proposed study focused on advancing knowledge about the hydrological response of pyroclastic fall coverings from the seasonal to event-based time scales, leading to the initiation of slope instability. The study was based on two consequential tasks. The first was the analysis of a six-year monitoring of soil pressure head carried out in a sample area of the Sarno Mountains, located above a debris flow initiation zone. The second was based on coupled hydrological and slope stability modeling performed on the physical models of slopes, which were reconstructed by empirical correlations between the slope angle, total thickness, and stratigraphic settings of pyroclastic fall deposits mantling slopes. The results obtained were: (a) The understanding of a soil pressure head regime of the volcaniclastic soil mantle, always ranging in unsaturated conditions and characterized by a strong seasonal variability depending on precipitation patterns and the life cycle of deciduous chestnut forest; and (b) the reconstruction through a deterministic approach of seasonal intensity–duration rainfall thresholds related to different morphological conditions. View Full-Text
Keywords: pyroclastic fall deposits; soil hydrological monitoring; slope hydrological response; debris flows hazard; physically based modeling; rainfall thresholds pyroclastic fall deposits; soil hydrological monitoring; slope hydrological response; debris flows hazard; physically based modeling; rainfall thresholds
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De Vita, P.; Fusco, F.; Tufano, R.; Cusano, D. Seasonal and Event-Based Hydrological and Slope Stability Modeling of Pyroclastic Fall Deposits Covering Slopes in Campania (Southern Italy). Water 2018, 10, 1140.

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