Debris slides–rapid earth flows in the carbonate massifs of the Campania region (Southern Italy): morphological and morphometric data for evaluating triggering susceptibility

Abstract. This study presents an historical database of flash flood events in the Campania region of southern Italy. The study focuses on small catchments characterized by intermittent flow, generally occurring during and after heavy rainstorms, which can be hydrologically defined as small Mediterranean catchments. As the outlet zones of these catchments (consisting mainly of alluvial fans or fan deltas) are highly urbanized in Campania, the population living in the delivery areas is exposed to high risk. Detailed scrutiny and critical analysis of the existing literature, and of the data inventory available, allowed us to build a robust database consisting of about 500 events from 1540 to 2015, which is continuously updated. Since this study is the first step of a longer project to perform a hazard analysis, information about time and site of occurrence is known for all events. As for the hazard analysis envisaged, collecting information about past events could provide information on future events, in terms of damage and also spatial and temporal occurrence. After introducing the issue of flash floods in Italy we then describe the geological and geomorphological settings of the study area. The database is then presented, illustrating the methodology used in collecting information and its general structure. The collected data are then discussed and the statistical data analysis presented.

Section: Introductionmentioning

confidence: 99%

A database on flash flood events in Campania, southern Italy, with an evaluation of their spatial and temporal distribution

Vennari

Parise

Santangelo

et al. 2016

“…The most severe events, in terms of injuries and fatalities, were those which occurred in Sarno (1998), Quindici (1998), Bracigliano (1998) andCervinara (1999) (Del Prete el al., 1998;Cascini et al, 2000;Revellino et al, 2004;Di Crescenzo and Santo, 2005;Picarelli et al, 2008a;Picarelli et al, 2008c;Cascini et al, 2010). These devastating flowslides mainly involved unsaturated cohesionless pyroclastic deposits and ran for tens of kilometres.…”

Section: Flowslides In Pyroclastic Soilsmentioning

confidence: 99%

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

Damiano

Mercogliano

Netti

et al. 2012

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.

“…Instead, in other sectors of the Mt. S. Angelo slope the pumice layers are very common, and date back to the 79 AD eruption (Di Crescenzo and Santo, 2005). This occurrence helps account for a poor mobility of the 2003 landslide event.…”

Section: The Case Studymentioning

confidence: 99%

“…For instance, Di Crescenzo and Santo (2005) and Iovine et al (2003 and used morphometric approaches or cellular automata models. Guadagno et al (2005) showed the results of detailed surveys of the morphological characteristics of the landslide source areas in Sarno -Quindici, demonstrating that the initial failures were probably associated with the presence of morphological discontinuities, such as limestone scarps and road cuts.…”

Section: Introductionmentioning

confidence: 99%

“…Guadagno et al (2005) showed the results of detailed surveys of the morphological characteristics of the landslide source areas in Sarno -Quindici, demonstrating that the initial failures were probably associated with the presence of morphological discontinuities, such as limestone scarps and road cuts. Di Crescenzo and Santo (2005) studied the various geomorphological aspects of these landslides and highlighted the repetitiveness of events along road cuts and rocky scarps: about 86% of their 172 investigated landslides occurred above or below roads/tracks and cliffs. P. Budetta: Rockfall-induced impact force causing a debris flow Civita et al (1975), Guadagno et al (1986) and Brancaccio et al (1999) focused on the role of rockfalls in triggering debris flows in the Mt.…”

Section: Introductionmentioning

confidence: 99%

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Rockfall-induced impact force causing a debris flow on a volcanoclastic soil slope: a case study in southern Italy

Budetta

2010

Abstract. On 10 January 2003, a rockfall of approximately 10 m 3 affected a cliff some 25 m high located along the northern slopes of Mt. St. Angelo (Nocera Inferiore, province of Salerno) in the southern Italian region of Campania. The impact of boulders on the lower sector of the slope, along which detrital-pyroclastic soils outcrop, triggered a small channelled debris flow of about 500 m 3 . Fortunately, no damage nor victims resulted from the landslide. Several marks of the impacts were observed at the cliff toe and outside the collapsed area, and the volumes of some fallen boulders were subsequently measured. By means of in-situ surveys, it was possible to reconstruct the cliff's geo-structural layout in detail. A rockfall back-analysis was subsequently performed along seven critical profiles of the entire slope (surface area of about 4000 m 2 ). The results of this numerical modelling using the lumped-mass method were then used to map the kinetic iso-energy curves. In the triggering area of the debris flow, for a falling boulder of 1 m 3 , the mean kinetic energy was estimated at 120 kJ, this value being equivalent to an impact force, on an inclined surface, of some 800 kN. After landing, due to the locally high slope gradient (about 45 • ), and low angle of trajectory at impact (about 23 • ), some boulders slid down the slope as far as the endpoints. The maximum depth of penetration into the ground by a sliding block was estimated at about 16 cm. Very likely, owing to the high impact force of boulders on the saturated soil slope outcropping at the cliff base, the debris flow was triggered under undrained loading conditions. Initial failure was characterized by a translational slide involving a limited, almost elliptical area where the pyroclastic cover shows greater thickness in comparison with the surrounding areas.