The role of the sea on the flash floods events over Liguria (northwestern Italy)

Cassola, Federico; Ferrari, Francesco; Mazzino, Andrea; Miglietta, Mario Marcello

doi:10.1002/2016gl068265

Cited by 87 publications

(74 citation statements)

References 34 publications

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“…ROLF has been a particularly intense TLC and, throughout its lifetime, has caused extensive damage even considerably far away from its pressure minimum [59]. Indeed, the SST anomaly of about 3 • C in the central basin of the Balearic Islands (Figure 3) and the intensity and duration of the event allow consideration of ROLF as a paradigmatic case for disentangling the role of air-sea interactions on a cyclone evolution.…”

Section: Discussionmentioning

confidence: 99%

Sensitivity of a Mediterranean Tropical-Like Cyclone to Different Model Configurations and Coupling Strategies

et al. 2017

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Abstract:In November 2011, an Atlantic depression affected the Mediterranean basin, eventually evolving into a Tropical-Like Cyclone (TLC or Mediterranean Hurricane, usually designated as Medicane). In the region affected by the Medicane, mean sea level pressures down to 990 hPa, wind speeds of hurricane intensity close to the eye (around 115 km/h) and intense rainfall in the prefrontal zone were reported. The intensity of this event, together with its long permanence over the sea, suggested its suitability as a paradigmatic case for investigating the sensitivity of a numerical modeling system to different configurations, air-sea interface parameterizations and coupling approaches. Toward this aim, a set of numerical experiments with different parameterization schemes and levels of coupling complexity was carried out within the Coupled Ocean Atmosphere Wave Sediment Transport System (COAWST), which allows the description of air-sea dynamics by coupling an atmospheric model (WRF), an ocean circulation model (ROMS), and a wave model (SWAN). The sensitivity to different initialization times and Planetary Boundary Layer (PBL) parameterizations was firstly investigated by running a set of WRF standalone (atmospheric-only) simulations. In order to better understand the effect of coupling on the TLC formation, intensification and trajectory, different configurations of atmosphere-ocean coupling were subsequently tested, eventually including the full coupling among atmosphere, ocean and waves, also changing the PBL parameterization and the formulation of the surface roughness. Results show a strong sensitivity of both the trajectory and the intensity of this TLC to the initial conditions, while the tracks and intensities provided by the coupled modeling approaches explored in this study do not introduce drastic modifications with respect to those resulting from a fine-tuned standalone atmospheric run, though they provide by definition a better physical and energetic consistency. Nevertheless; the use of different schemes for the calculation of the surface roughness from wave motion, which reflects the description of air-sea interface processes, can significantly affect the results in the fully coupled runs.

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Section: Discussionmentioning

confidence: 99%

Sensitivity of a Mediterranean Tropical-Like Cyclone to Different Model Configurations and Coupling Strategies

et al. 2017

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“…Use of CFSR reanalysis data for wave modelling provides reliable results, even if sometimes extreme wave conditions are not properly modelled (Cavaleri, 2009;Cox et al, 2011;Splinder et al, 2011;Carvalho et al, 2012;Chawla et al, 2013). For further details of the set-up and validation of the meteorological model, readers can refer to Cassola et al (2015Cassola et al ( , 2016.…”

Section: Clustering Analysis Methodologymentioning

confidence: 99%

Time clustering of wave storms in the Mediterranean Sea

Besio

Briganti

Romano

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. In this contribution we identify storm time clustering in the Mediterranean Sea through a comprehensive analysis of the Allan factor. This parameter is evaluated from a long time series of wave height provided by oceanographic buoy measurements and hindcast reanalysis of the whole basin, spanning the period 1979-2014 and characterized by a horizontal resolution of about 0.1 • in longitude and latitude and a temporal sampling of 1 h (Mentaschi et al., 2015). The nature of the processes highlighted by the AF and the spatial distribution of the parameter are both investigated. Results reveal that the Allan factor follows different curves at two distinct timescales. The range of timescales between 12 h to 50 days is characterized by a departure from the Poisson distribution. For timescales above 50 days, a cyclic Poisson process is identified. The spatial distribution of the Allan factor reveals that the clustering at smaller timescales is present to the north-west of the Mediterranean, while seasonality is observed across the whole basin. This analysis is believed to be important for assessing the local increased flood and coastal erosion risks due to storm clustering.

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“…Due to self-regenerating storm cells or to persistent cyclonic Tyrrhenian circulation (Crosta 1998;Cevasco et al 2009), extreme precipitation can occur, between late summer and mid-autumn, along the coast of eastern Liguria (van Delden 2001;Silvestro et al 2012Silvestro et al , 2015Rebora et al 2013;Buzzi et al 2014;Cevasco et al 2015;Cassola et al 2016). Usually these rainstorms have short duration (<24 h), but rainfall intensities can reach or exceed values of 100 mm h ¡1 .…”

Section: General Features Of the Study Areamentioning

confidence: 99%

Shallow landslide initiation on terraced slopes: inferences from a physically based approach

Schilirò

Cevasco

Esposito

et al. 2018

Geomatics, Natural Hazards and Risk

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In the last years, great efforts have been made to improve the assessment of the temporal and spatial occurrence of rainfall-induced shallow landslides. Therefore, in this paper we used a physically based stability model (TRIGRS) in order to reproduce the landslide event occurred in the Monterosso catchment (Cinque Terre, Eastern Liguria, Italy) on 25 October 2011. The input parameters of the numerical model have been evaluated taking into account the land-use setting and paying specific attention to the evaluation of the spatial variation of soil thickness on terraced areas. The resulting safety factor maps have been compared with the inventory map of the landslides triggered during the event. The simulation results, which have been obtained also considering four different spatial resolutions of the digital terrain model, emphasize the influence of land use in shallow landslide occurrence and indicate the importance of a realistic spatial variation of soil thickness to enhance the reliability of the model. Finally, different triggering scenarios have been defined using hourly rainfall values statistically derived from historical data. The results indicate the proneness of the area to shallow landsliding, given that rainfall events with a relatively low return period (e.g. 25 years) can trigger numerous slope failures.

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The role of the sea on the flash floods events over Liguria (northwestern Italy)

Cited by 87 publications

References 34 publications

Sensitivity of a Mediterranean Tropical-Like Cyclone to Different Model Configurations and Coupling Strategies

Sensitivity of a Mediterranean Tropical-Like Cyclone to Different Model Configurations and Coupling Strategies

Time clustering of wave storms in the Mediterranean Sea

Shallow landslide initiation on terraced slopes: inferences from a physically based approach

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