Tartaglia, Marialaura (2022) Triggering of meteo-induced flow-like landslides in unsaturated pyroclastic soil: Pozzano and Pimonte case histories (Campania region). [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Triggering of meteo-induced flow-like landslides in unsaturated pyroclastic soil: Pozzano and Pimonte case histories (Campania region) |
| Autori: | Autore Email Tartaglia, Marialaura marialaura.tartaglia@unina.it |
| Data: | 14 Marzo 2022 |
| Numero di pagine: | 268 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dipartimento: | Strutture per l'Ingegneria e l'Architettura |
| Dottorato: | Ingegneria strutturale, geotecnica e rischio sismico |
| Ciclo di dottorato: | 34 |
| Coordinatore del Corso di dottorato: | nome email Iervolino, Iunio iunio.iervolino@unina.it |
| Tutor: | nome email Gianfranco, Urciuoli [non definito] |
| Data: | 14 Marzo 2022 |
| Numero di pagine: | 268 |
| Parole chiave: | meteo-induced flow-like landslides; unsaturated pyroclastic soils; slope stability |
| Settori scientifico-disciplinari del MIUR: | Area 08 - Ingegneria civile e Architettura > ICAR/07 - Geotecnica |
| Depositato il: | 16 Mar 2022 14:30 |
| Ultima modifica: | 28 Feb 2024 10:59 |
| URI: | http://www.fedoa.unina.it/id/eprint/14414 |
Abstract
Flowslides, debris flows and debris avalanches (flow-like landslides) in granular soils are a serious threat to human life against which Early Warning Systems (EWSs) are usually implemented. In the Campania region (Southern Italy), sloping pyroclastic covers in partially saturated conditions are frequently affected by these types of landslides. In this context, safeguarding of human life is entrusted to EWSs, typically based on empirical precipitation intensity-duration thresholds that suffer from missed and false alarms. Indeed, consequences of a heavy rainfall (rainstorm or cloudburst) depend on the hydraulic condition in the subsoil before the rainstorm. If this aspect is neglected, precipitation intensity-duration thresholds can fail. However, although the current hydraulic condition in the soil is a discriminating factor, it is rarely measured and taken into account. In this regard, a numerical approach to reproduce numerically the current hydraulic condition in the slope (antecedent the rainstorm responsible for triggering) is presented. The study is based on the back-analysis of two debris flows occurred in Campania region by means of an un-coupled hydro-mechanical numerical modelling. Stratigraphy and hydro-mechanical characteristics of the soil layers are known, thanks to surveys and investigations carried out at an experimental test site (assumed as representative of the geotechnical features of the considered basin), set up few kilometres far from the two occurred debris flows. Results shows that in the slopes examined, the hydraulic state in the subsoil before the landslide triggering is correctly reproduced through an infiltration analysis starting few months before, in which rainfalls registered on site are imposed as an entering flow at ground level. Moreover, it is shown that the water storage in the entire loose soil cover is an effective indicator of the average hydraulic state of the slope, more than local variables, such as suction and water content.
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