The Ligurian slopes facing the Tyrrenian Sea extend along the coast for nearly 300 km between France border to Tuscany: this stretch of territory presents more than a hundred catchments characterized by small floodplains. The slopes are very steep, while the alluvial plains are typically narrow and elongated. Ligurian catchments, except for the Roja and the Magra rivers, have common features: they can be distinguished in very small (<15 km2), small (15-150 km2) and medium basins (150-500 km2). Ligurian alluvial plains are historically characterized by floods that have caused damage for million of euro and tens of casualties. Over the last decades, an increase in alluvial events has been observed, both due to the variation in rainfall regime and in changes of land-use, which have heavily influenced the geomorphological processes. The great part of Ligurian urbanized areas are located in floodplains: these large areas represent the expansion of the small historical settlements and their original road connections. Through a comparison of old maps it was rebuilt the morphological evolution of Ligurian floodplains in historical times. Using historical maps of XVIII and XIX century, and regional maps for second half of XX century, the land-use and riverbed changes in the last centuries have been evidenced. The current status was assessed by Google Earth Pro platform. The secular human activities in Liguria have clearly modified the floodplain environment. The main channel, and even the minor hydrographic network, have showed major transformations over time. In many cases a narrowing and riverbed covering has been detected, especially in the medium-terminal stretch, with the aim to create new urbanizable areas for buildings and roads. Other widespread changes finally concern deviations and displacements of the riverbed, progradation of the coastline due to fills

Geomorphological changes due to anthropic activity in the highly urbanized floodplains of small ligurian Mediterranean basins (Italy)

Faccini F.;Paliaga G.;Roccati A.;
2017-01-01

Abstract

The Ligurian slopes facing the Tyrrenian Sea extend along the coast for nearly 300 km between France border to Tuscany: this stretch of territory presents more than a hundred catchments characterized by small floodplains. The slopes are very steep, while the alluvial plains are typically narrow and elongated. Ligurian catchments, except for the Roja and the Magra rivers, have common features: they can be distinguished in very small (<15 km2), small (15-150 km2) and medium basins (150-500 km2). Ligurian alluvial plains are historically characterized by floods that have caused damage for million of euro and tens of casualties. Over the last decades, an increase in alluvial events has been observed, both due to the variation in rainfall regime and in changes of land-use, which have heavily influenced the geomorphological processes. The great part of Ligurian urbanized areas are located in floodplains: these large areas represent the expansion of the small historical settlements and their original road connections. Through a comparison of old maps it was rebuilt the morphological evolution of Ligurian floodplains in historical times. Using historical maps of XVIII and XIX century, and regional maps for second half of XX century, the land-use and riverbed changes in the last centuries have been evidenced. The current status was assessed by Google Earth Pro platform. The secular human activities in Liguria have clearly modified the floodplain environment. The main channel, and even the minor hydrographic network, have showed major transformations over time. In many cases a narrowing and riverbed covering has been detected, especially in the medium-terminal stretch, with the aim to create new urbanizable areas for buildings and roads. Other widespread changes finally concern deviations and displacements of the riverbed, progradation of the coastline due to fills
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/932936
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