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**3** 

*Italia* 

**Geomorphological Instability** 

Francesca Daverio and Rosamaria Di Michele

Enrico Miccadei, Tommaso Piacentini,

*Dipartimento di Ingegneria e Geologia,* 

**Triggered by Heavy Rainfall: Examples** 

*Università degli Studi "G. d'Annunzio" di Chieti-Pescara, Chieti scalo (CH),* 

Heavy rainfall is one of the most important triggering causes of landslides - particularly in Mediterranean areas, that are characterised by moderate to low annual precipitation and, occasionally, by high precipitation intensity (up to >200mm/day)-. In agricultural or poorly vegetated hilly landscapes - particularly when characterised by clayey lithologies - heavy rainfall triggers very rapid geomorphological processes, such as floods, soil erosion (rill, gullies) and landslides (rapid earthflows) inducing strong erosion rates on the hilly landscape, sediment transport and sedimentation along the alluvial plains and at the

The distribution of geomorphological processes and landforms triggered by these events is variable and controlled by several geological, geomorphological, meteorological and landuse factors. In this work, we analyse the landforms triggered by heavy rainfall in three case

Over the last ten years, the Abruzzi region was affected by several heavy rainfall events. Three of them have had daily rainfall > 100 mm and >200 mm over few days: 1) on 23-25 January 2003 (in the whole region), 2) on 6-7 October 2007 (in a small part of the hilly and coastal Teramo area), and 3) on 1-2 March 2011 (in the hilly and coastal Teramo and Pescara area). These events have triggered different types of geomorphological instability: landslides, soil erosion and flooding. The distribution and types of instabilities and

The 2003, 2007 and 2011, heavy rainfall events were analysed with regard to their meteorological aspects, and geological and geomorphological features, highlighting both

The meteorological aspects were studied by processing a >40 pluviometric station database. The data processing enabled the analysis and comparison of hourly rainfall intensity,

cumulative rainfall, daily rainfall, monthly rainfall and previous monthly rainfall.

**1. Introduction** 

mouths of rivers.

studies from the Abruzzi region in Central Italy.

landforms is different in the three cases.

common and distinct geomorphological effects on the landscape.

**in the Abruzzi Region (Central Italy)** 

