Extreme Flood and Landslides Triggered in the Arroscia Valley (Liguria Region, Northwestern Italy) During the November 2016 Rainfall Event

Pepe, Giacomino; Mandarino, Andrea; Raso, Emanuele; Cevasco, Andrea; Firpo, Marco

doi:10.1007/978-3-319-93124-1_21

Cited by 19 publications

(23 citation statements)

References 10 publications

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“…Nowadays, the widespread presence of several facilities and infrastructures close to the riverbed represents a serious urban planning and management issue in terms of geo-hydrological risk mitigation (Cencetti et al, 2017;Gardiner, 1991;Luino & Susella, 2014;Mandarino et al, 2019a;Pepe et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Urban geomorphology of a historical city straddling the Tanaro River (Alessandria, NW Italy)

et al. 2020

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The integration of field surveys, bibliographic research and multitemporal analysis of historical maps, aerial photographs and satellite images in a GIS environment, allowed the current and past geomorphological features of the old city of Alessandria and its surrounding areas, NW Italy, to be identified and mapped. Their analysis provided an overview of the geomorphological evolution of the city that is strictly related to the historical vicissitudes occurred since the Middle Ages. Nowadays, the most representative landforms and deposits characterizing the urban landscape result from human interventions and are associated with ancient military facilities and infrastructures, a historical man-made channel network no longer recognizable, the Tanaro riverbed channelization, and the urban sprawl occurred from the second half of the nineteenth century onwards. This study represents a useful tool for urban planning and management and for raising the citizens' awareness of the urbanlandscape geomorphological features and evolution, and therefore the geo-hydrological risk.

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Section: Resultsmentioning

confidence: 99%

Urban geomorphology of a historical city straddling the Tanaro River (Alessandria, NW Italy)

et al. 2020

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“…and 67 m a.s.l., and the mean annual rainfall is 900 mm [6 and references therein]. Due to its geographical and geomorphological settings, the Scrivia river basin is prone to floods [20]. regarding the flow rates, the mean daily discharge and the mean annual maximum discharge, measured from 2001 to 2016 at the gauging station located 5.14 km upstream from the Po confluence, are 14.2 m 3 /s and 304 m 3 /s, respectively.…”

Section: Study Areamentioning

confidence: 99%

‘The stolen space’: A history of channelization, reduction of riverine areas and related management issues. The lower Scrivia River case study (NW Italy)

Mandarino¹,

Maerker²,

Firpo³

2019

Int. J. SDP

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In this research, we present the lower Scrivia river planform changes occurred from 1878 to 2016. furthermore, we illustrate the channelization-works development and the land-use changes registered close to the riverbed after the 1950s. The Scrivia river is among the most relevant right-bank tributaries of the Po river; it is about 90 km long and origins from the ligurian-Piedmontese appennines. The study reach is about 16 km long, close to the Po river, and generally shows a single-thread, sinuous and deep-incised channel. Nowadays the lower Scrivia river presents many bank retreat processes that involve surrounding areas, creating serious management issues. The aim of this research is to outline in detail the active-channel morphological evolution over the last 100-150 years, and characterize channelization and riverscape changes, with a specific focus on the occupation of the areas of fluvial pertinence. a quantitative multi-temporal analysis supported by field surveys and based on historical maps, aerial photographs and satellite images was performed in a gIS environment through automated and semi-automated procedures. The active channel experienced a well-defined sequence of morphological evolutionary phases. They were substantially characterized by a gradual increase of the active-channel stability and a reduction of the active-channel width, up to the end of the 20th century. Since the 2000s, morphological evolutionary trends have changed. anthropic pressures on the river system, and in particular bank protections, are documented to have played a key role in driving the active-channel changes, and consequently, the near-riverbed land-property and land-use changes. In this respect, on the basis of cadastral data, the past legal framework is also identified as a relevant conditioning factor of the river-corridor morphological evolution. The ongoing dynamics most probably represent the morphological response to the documented, severe anthropic alterations, and are currently raising serious management issues.

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“…However, inside the basin an increase of the mean annual precipitation with altitude is observed, with values reaching approximately 1500-1700 mm in the upper sections, near the main water divide. Here, the orographic effects brought by the Northern Apennines, and the peculiar atmospheric circulation affecting the Ligurian Sea, frequently produce abundant and sometimes very intense precipitations [61][62][63][64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Short-Term GIS Analysis for the Assessment of the Recent Active-Channel Planform Adjustments in a Widening, Highly Altered River: The Scrivia River, Italy

Mandarino

Pepe

Maerker

et al. 2020

Water

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From the 1990s onwards several Italian rivers have experienced a recent phase characterized by active-channel widening and, generally, by bed-level stability or slight aggradation. However, its triggering factors and its diffusion, along with the relationship between active-channel planform dynamics and vertical adjustments, are still quite debated and only few studies are available. This research deals with the active-channel planform changes occurred along the Scrivia River floodplain reach (NW Italy) over the period 1999–2019 and it aims at investigating in detail the ongoing geomorphological processes under the river management perspective. The study is based on a quantitative multitemporal analysis of aerial photographs and satellite images performed in a GIS environment and supported by field surveys. The outcomes revealed a generalized trend of gentle active-channel widening together with widespread bank instability and several (26% of total banks) intense and localized bank retreats involving both the modern floodplain and the recent terrace. In the investigated 20-year period, the active-channel area has increased by 22.7% (from 613.6 to 753.0 ha), its mean width by 25% (from 151.5 to 189.3 m), whereas no relevant length variations have been noticed. These morphological dynamics have been more or less pronounced both at reach scale and over time. The extreme floods occurred in the investigated period can be considered the most important triggering factor of the active-channel planform changes, most probably together with an increase of the reach-scale unit stream power due to changes in the channel geometry occurred over the 20th century.

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Extreme Flood and Landslides Triggered in the Arroscia Valley (Liguria Region, Northwestern Italy) During the November 2016 Rainfall Event

Cited by 19 publications

References 10 publications

Urban geomorphology of a historical city straddling the Tanaro River (Alessandria, NW Italy)

Urban geomorphology of a historical city straddling the Tanaro River (Alessandria, NW Italy)

‘The stolen space’: A history of channelization, reduction of riverine areas and related management issues. The lower Scrivia River case study (NW Italy)

Short-Term GIS Analysis for the Assessment of the Recent Active-Channel Planform Adjustments in a Widening, Highly Altered River: The Scrivia River, Italy

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