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The Role of Hydraulic Hysteresis on the Hydrological Response of Pyroclastic Silty Covers

REgional Models and Geo-Hydrological Impacts, Fondazione CMCC Centro Euro-Mediterraneo sui Cambiamenti Climatici, 81043 Capua (CE), Italy
Dipartimento di Ingegneria, Università della Campania “Luigi Vanvitelli”, 81031 Aversa (CE), Italy
Dipartimento di Ingegneria Civile Edile e Ambientale, Università di Napoli “Federico II”, 80125 Napoli, Italy
Author to whom correspondence should be addressed.
Water 2019, 11(3), 628;
Received: 15 February 2019 / Revised: 13 March 2019 / Accepted: 22 March 2019 / Published: 26 March 2019
(This article belongs to the Special Issue The Role of Water in Shallow and Deep Landslides)
PDF [4561 KB, uploaded 26 March 2019]


A significant part of the recent geotechnical literature concerning pyroclastic soils is focused on the characterization of the hydrological effects of precipitations and their implications for the stability conditions of unsaturated sloping covers. Recent experience shows that suction-induced strength reduction is influenced by various factors including hydraulic hysteresis. A deeper insight into the hysteretic water retention behavior of these materials and its effects upon their response to dry/wetting conditions is a major goal of this paper, which exploits the data provided by the monitoring of a volcanic ash. Based on the parameters retrieved from data calibration, the hydrological response of a virtual slope subject to one-dimensional rainfall infiltration is investigated by numerical analyses and compared with the results obtained through the usually adopted non-hysteretic approaches. The analysis demonstrates that considering the hysteretic behavior may be crucial for a proper evaluation of the conditions leading to slope failure. View Full-Text
Keywords: hydraulic hysteresis; pyroclastic soils; slope stability; predictive models hydraulic hysteresis; pyroclastic soils; slope stability; predictive models

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Rianna, G.; Comegna, L.; Pagano, L.; Picarelli, L.; Reder, A. The Role of Hydraulic Hysteresis on the Hydrological Response of Pyroclastic Silty Covers. Water 2019, 11, 628.

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