GeoActa Special Publication 1
2008
Acquisto online |
GeoActa
an international Journal of Earth Sciences
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Vinicio
Manzi
Dipartimento
di Scienze della Terra, Università degli Studi di Parma, Parco
Area delle Scienze 157/A, 43100, Parma, Italy. E-mail: vinicio.manzi@unipr.it
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Enrico
Leuratti, Claudio Corrado Lucente, Elena Medda
Servizio
Tecnico Bacini Panaro e destra Secchia, Regione Emilia-Romagna, Via Fonteraso
15, 41100 Modena, Italy
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Matteo
Guerra, Alessandro Corsini
Dipartimento
di Scienze della Terra, Università degli Studi di Modena e Reggio
Emilia, Largo S. Eufemia 1, 41100, Modena, Italy
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Historical
and recent hydrogeological instability in the Monte Modino area: Valoria,
Tolara and Lezza Nuova landslide reactivations (Dolo-Dragone valleys,
Modena Apennines, Italy)
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PDF
(472 KB)
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Abstract
Following
the heavy rainfalls of autumn 2000 a strong resumption of hydrogeological
instability was observed throughout the whole Emilian Apennines. In
the Modena province the effect of such event was the reactivation of
many landslides. In the Monte Modino area (an elongated mountain ridge
bounded by Dolo and Dragone stream valleys, high Modena Apennines) three
large complex landslides (Valoria, Tolara and Lezza Nuova) were reactivated.
While landslides were triggered by a strong increase in precipitation,
the main cause of slope instability is possibly related to the peculiar
hydrogeological setting of the watershed: a thick unit of highly fracturated
sandstones overlying a clayey formation. In this paper, the role of
abundant rainfall events, periodically occurring in the Modena Apennines,
as primary cause for landslide reactivation is discussed.
The preliminary stabilisation works adopted by the Servizio Tecnico
Bacini Panaro e destra Secchia Modena, have been restricted to
restoration of slope stability with rehabilitation of the drainage system
within each single landslide, mainly during emergencies.
We believe that, due to the peculiar hydrogeological setting of Monte
Modino area, future interventions should provide the stabilization of
the whole watershed area. An overall drainage of Monte Modino sandstone
unit is proposed to achieve this target.
Keywords:
complex
landslides, historical reactivations, hydrogeological hazards, Northern
Apennines
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