Hydrological and hydraulic analysis of the flash flood event on 25 October 2007 in North-Eastern part of Sicily, Italy

Aronica, Giuseppe Tito; Brigandì, Giuseppina; Marletta, C; Manfrè, Bruno

doi:10.1201/9780203883020.ch190

Cited by 11 publications

(8 citation statements)

References 1 publication

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“…On this day, approximately 134 mm of rain fell in the area, and this event also featured extremely high intensity peaks (i.e., 29.1 mm in 10 min). The damage to buildings and infrastructure was remarkable; however, unlike the 1 October event, there were no casualties (Aronica et al, 2008). Heavy rainstorms also hit the area after the 1 October 2009 event, i.e., in the night between 9 and 10 March 2010 and on 1 March 2011.…”

Section: Previous Flooding and Related Eventsmentioning

confidence: 99%

Evaluation of shallow landslide-triggering scenarios through a physically based approach: an example of application in the southern Messina area (northeastern Sicily, Italy)

Schilirò

Esposito

Mugnozza

2015

Nat. Hazards Earth Syst. Sci.

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Abstract. Rainfall-induced shallow landslides are a widespread phenomenon that frequently causes substantial damage to property, as well as numerous casualties. In recent years a wide range of physically based models have been developed to analyze the triggering process of these events. Specifically, in this paper we propose an approach for the evaluation of different shallow landslide-triggering scenarios by means of the TRIGRS (transient rainfall infiltration and grid-based slope stability) numerical model. For the validation of the model, a back analysis of the landslide event that occurred in the study area (located SW of Messina, northeastern Sicily, Italy) on 1 October 2009 was performed, by using different methods and techniques for the definition of the input parameters. After evaluating the reliability of the model through comparison with the 2009 landslide inventory, different triggering scenarios were defined using rainfall values derived from the rainfall probability curves, reconstructed on the basis of daily and hourly historical rainfall data. The results emphasize how these phenomena are likely to occur in the area, given that even short-duration (1-3 h) rainfall events with a relatively low return period (e.g., 10-20 years) can trigger numerous slope failures. Furthermore, for the same rainfall amount, the daily simulations underestimate the instability conditions. The high susceptibility of this area to shallow landslides is testified by the high number of landslide/flood events that have occurred in the past and are summarized in this paper by means of archival research. Considering the main features of the proposed approach, the authors suggest that this methodology could be applied to different areas, even for the development of landslide early warning systems.

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Section: Previous Flooding and Related Eventsmentioning

confidence: 99%

Evaluation of shallow landslide-triggering scenarios through a physically based approach: an example of application in the southern Messina area (northeastern Sicily, Italy)

Schilirò

Esposito

Mugnozza

2015

Nat. Hazards Earth Syst. Sci.

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“…On 25 October 2007 more than 120 mm of rain fell in less than 3 hours, with 50 % of the recorded rain concentrated in about 20 min (Aronica et al, 2008). A more extreme storm occurred on 1 October 2009, with high intensity rainfall (exceeding 230 mm in 8 hours) on an area of about 60 km 2 around Giampilieri.…”

Section: Study Area and Model Applicationmentioning

confidence: 99%

The influence of grid resolution on the prediction of natural and road-related shallow landslides

Penna

Borga

Aronica

et al. 2014

Hydrol. Earth Syst. Sci.

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Abstract. This work evaluates the predictive power of the quasi-dynamic shallow landslide model QD-SLaM to simulate shallow landslide locations in a small-scale Mediterranean landscape, namely, the lower portion (2.6 km 2 ) of the Giampilieri catchment, located in Sicily (Italy). The catchment was impacted by a sequence of high-intensity storms over the years [2007][2008][2009], resulting in widespread landsliding, with a total landslide initiation area amounting to 2.6 % of the basin area. The effect of high-resolution digital terrain models (DTMs) on the quality of model predictions is tested by considering four DTM resolutions: 2, 4, 10 and 20 m. Moreover, the impact of the dense forest road network on the model performance is evaluated by separately considering road-related landslides and natural landslides. The landslide model does not incorporate the description of road-related failures and is applied without calibration of the model parameters. The model predictive power is shown to be DTM-resolution dependent. Use of coarser resolution has a smoothing effect on terrain attributes, with local slope angles decreasing and contributing areas becoming larger. The percentage of watershed area represented by the model as unconditionally unstable (i.e. failing even without the addition of water from precipitation) ranges between 6.3 % at 20 m DTM and 13.8 % at 2 m DTM, showing an overestimation of the mapped landslide area. We consider this prediction as an indication for likely failing sites in future storms rather than areas proved stable during previous storms. When assessed over the sample of mapped non-road-related landslides, better model performances are reported for 4 and 10 m DTM resolution, thus highlighting the fact that higher DTM resolution does not necessarily mean better model performances. Model performances over road-related failures are lower than for the natural cases, and slightly increase with decreasing DTM resolution. These findings indicate that to realize the full potential of high-resolution topography, more extensive work is needed aiming more specifically to identify the extent of the artificial structures and their impact on shallow landsliding processes.

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“…Assuming a linear profile for the hydrostatic component, a constant value for the hydro-dynamic profile, and a concentrated force for impact. The total forces exerted to the exposed walls can be evaluated from Equation (3) and (3). Figure 15 demonstrates the footprint of the flow depth envelope on both walls of the building that is exposed to debris flow.…”

Section: The Debris-flow Actionmentioning

confidence: 99%

Analytic Back Calculation of Debris Flow Damage Incurred to a Masonry Building: The Case of Scaletta Zanclea 2009 Event

et al. 2016

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Abstract.In an attempt to do a back analysis of the damages caused to a nineteenth century masonry structure due to the October 2009 flash flood/debris flow event in Scaletta Zanclea, the flood discharge hydrograph is reconstructed in the ungauged conditions. The hydrograph for the solid discharge is then estimated by scaling up the liquid volume to the estimated debris volume. The debris flow diffusion is simulated by solving the differential equations for a single-phase 2D flow employing triangular mesh elements, taking into account also the channelling of the flow through the buildings. The damage to the building is modelled, based on the maximum hydraulic actions caused by the debris flow, using 2D finite shell elements to model the building, boundary conditions provided by the openings, floor slab, orthogonal wall panels, and the foundation. The reconstruction of the event and the damages to the case-study building confirms the location of the damages induced by the event.

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Hydrological and hydraulic analysis of the flash flood event on 25 October 2007 in North-Eastern part of Sicily, Italy

Cited by 11 publications

References 1 publication

Evaluation of shallow landslide-triggering scenarios through a physically based approach: an example of application in the southern Messina area (northeastern Sicily, Italy)

Evaluation of shallow landslide-triggering scenarios through a physically based approach: an example of application in the southern Messina area (northeastern Sicily, Italy)

The influence of grid resolution on the prediction of natural and road-related shallow landslides

Analytic Back Calculation of Debris Flow Damage Incurred to a Masonry Building: The Case of Scaletta Zanclea 2009 Event

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