A research on rainfall-induced flowslides in unsaturated soils of pyroclastic origin

Picarelli, Luciano; Olivares, Lucio; Andreozzi, L; Damiano, Emilia; Lampitiello, Salvatore

doi:10.1201/b16816-214

Cited by 4 publications

(2 citation statements)

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“…O. 2.38, 1998;Sorbino and Foresta, 2002;Crosta and Dal Negro, 2003;Picarelli et al, 2004;Bilotta et al, 2005;Cascini et al, 2006). Details on the geological setting can be found in Cascini et al (2008b), while details on the geotechnical properties of the involved pyroclastic soils are provided by Bilotta et al (2005), who identified three main lithotypes: pumice soils essentially constituted by sands and gravels, coarser superficial ashy silty sands (class B), and finer deep ashy sandy silts (class A).…”

Section: Adopted Proceduresmentioning

confidence: 91%

Spatial and temporal occurrence of rainfall-induced shallow landslides of flow type: A case of Sarno-Quindici, Italy

2011

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Section: Adopted Proceduresmentioning

confidence: 91%

Spatial and temporal occurrence of rainfall-induced shallow landslides of flow type: A case of Sarno-Quindici, Italy

2011

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“…Celico and Guadagno 1998;Guadagno et al 2005; recognized factors that directly control landslide susceptibility and location of the triggering areas, the role of stratigraphic and morphological settings of natural slope morphological features as well as artificial modifications, including man-made cuts and fills. Moreover, unsaturated properties and hydrological regime of ash-fall pyroclastic soils were also considered as a key factor for understanding the hydrogeological behaviour of the soil mantle (Picarelli et al 2004;Sorbino 2005;Fusco et al 2017). Finally, soil antecedent-hydrological conditions were recognised as strongly controlling the effects of the rainfall events on the slope stability (Napolitano et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Hydrological control of soil thickness spatial variability on the initiation of rainfall-induced shallow landslides using a three-dimensional model

et al. 2021

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Thickness and stratigraphic settings of soils covering slopes potentially control susceptibility to initiation of rainfall-induced shallow landslides due to their local effect on slope hydrological response. Notwithstanding the relevance of the assessment of hazard to shallow landsliding at a distributed scale by approaches based on a coupled modelling of slope hydrological response and slope stability, the spatial variability of soil thickness and stratigraphic settings are factors poorly considered in the literature. Under these premises, this paper advances the well-known case study of rainfall-induced shallow landslides involving ash-fall pyroclastic soils covering the peri-Vesuvian mountains (Campania, southern Italy). In such a unique geomorphological setting, the soil covering is formed by alternating loose ash-fall pyroclastic deposits and paleosols, with high contrasts in hydraulic conductivity and total thickness decreasing as the slope angle increases, thus leading to the establishment of lateral flow and an increase of pore water pressure in localised sectors of the slope where soil horizon thickness is less. In particular, we investigate the effects, on hillslope hydrological regime and slope stability, of irregular bedrock topography, spatial variability of soil thickness and vertical hydraulic heterogeneity of soil horizons, by using a coupled three-dimensional hydrological and a probabilistic infinite slope stability model. The modelling is applied on a sample mountain catchment, located on Sarno Mountains (Campania, southern Italy), and calibrated using physics-based rainfall thresholds derived from the literature. The results obtained under five simulated constant rainfall intensities (2.5, 5, 10, 20 and 40 mm h−1) show an increase of soil pressure head and major failure probability corresponding to stratigraphic and morphological discontinuities, where a soil thickness reduction occurs. The outcomes obtained from modelling match the hypothesis of the formation of lateral throughflow due to the effect of intense rainfall, which leads to the increase of soil water pressure head and water content, up to values of near-saturation, in narrow zones of the slope, such as those of downslope reduction of total soil thickness and pinching out of soil horizons. The approach proposed can be conceived as a further advance in the comprehension of slope hydrological processes at a detailed scale and their effects on slope stability under given rainfall and antecedent soil hydrological conditions, therefore in predicting the most susceptible areas to initiation of rainfall-induced shallow landslides and the related I-D rainfall thresholds. Results obtained demonstrate the occurrence of a slope hydrological response depending on the spatial variability of soil thickness and leading to focus slope instability in specific slope sectors. The approach proposed is conceived to be potentially exportable to other slope environments for which a spatial modelling of soil thickness would be possible.

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A "simulation chain" to define a Multidisciplinary Decision Support System for landslide risk management in pyroclastic soils

Damiano

Mercogliano

Netti

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper proposes a Multidisciplinary Decision Support System (MDSS) as an approach to manage rainfallinduced shallow landslides of the flow type (flowslides) in pyroclastic deposits. We stress the need to combine information from the fields of meteorology, geology, hydrology, geotechnics and economics to support the agencies engaged in land monitoring and management. The MDSS consists of a "simulation chain" to link rainfall to effects in terms of infiltration, slope stability and vulnerability. This "simulation chain" was developed at the Euro-Mediterranean Centre for Climate Change (CMCC) (meteorological aspects), at the Geotechnical Laboratory of the Second University of Naples (hydrological and geotechnical aspects) and at the Department of Economics of the University of Naples "Federico II" (economic aspects). The results obtained from the application of this simulation chain in the Cervinara area during eleven years of research allowed in-depth analysis of the mechanisms underlying a flowslide in pyroclastic soil.

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A research on rainfall-induced flowslides in unsaturated soils of pyroclastic origin

Cited by 4 publications

References 1 publication

Spatial and temporal occurrence of rainfall-induced shallow landslides of flow type: A case of Sarno-Quindici, Italy

Spatial and temporal occurrence of rainfall-induced shallow landslides of flow type: A case of Sarno-Quindici, Italy

Hydrological control of soil thickness spatial variability on the initiation of rainfall-induced shallow landslides using a three-dimensional model

A "simulation chain" to define a Multidisciplinary Decision Support System for landslide risk management in pyroclastic soils

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A research on rainfall-induced flowslides in unsaturated soils of pyroclastic origin

Cited by 4 publications

References 1 publication

Spatial and temporal occurrence of rainfall-induced shallow landslides of flow type: A case of Sarno-Quindici, Italy

Spatial and temporal occurrence of rainfall-induced shallow landslides of flow type: A case of Sarno-Quindici, Italy

Hydrological control of soil thickness spatial variability on the initiation of rainfall-induced shallow landslides using a three-dimensional model

A &quot;simulation chain&quot; to define a Multidisciplinary Decision Support System for landslide risk management in pyroclastic soils

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A "simulation chain" to define a Multidisciplinary Decision Support System for landslide risk management in pyroclastic soils