The Serchio river basin (about 1600 km2 wide), includes hilly and mountainous areas, where historical towns lie together with industries, factories and tourist facilities, linked by well- developed infrastructures. The geological and geomorphological settings of the basin, the severe climatic conditions favour hydro- geological instability. Frequently heavy and\or relentless rainfall caused the Serchio River and its tributary to overflow, life- threatening and exposing to severe danger towns, resorts, factories and roads. Many landslides occur causing severe damages, high hazard and risk. This situation wholly justifies efforts to improve knowledge of stream dynamics, inundation recurrence and floodplain geomorphological evolution in high risk valley floor areas. Since 2006, the Serchio River Basin Authority (Italian Department of the Environment) has commissioned a LiDAR (Light Detection and Ranging) survey into the valley floor of the Serchio River and along some of its major tributaries, in order to improve knowledge of stream dynamics, to analyse and monitor the territory of jurisdiction. The LiDAR aerial mapping constitutes an innovative and effective instrument for advanced hydrologic and geomorphological assessment. High precision Digital Surface Model (DSM) completed with buildings and vegetation, a filtered DSM obtained by removing vegetation, and a Digital Terrain Model (DTM) derived from the DSM by post-processing, allowed for hydrologic modelling and geomorphological mapping, almost unfeasible by the regional technical map, nor on aerial photos. Multi-temporal aerial photogrammetric analysis was also performed in order to compare the digital model with the photorealistic model and match them together. The outcome of this study is a step forward into hydrologic and geomorphological assessment of floodplain dynamics and evolution., with particular regard to stream erosion activity, flooded areas reconstruction and mapping. Also, the most evident ransformation of the floodplain due to the human activities, such as buildings enlargement, landfill, stores of wasted and\or buildings materials, were identified and monitored.
Riverbed and floodplain evolution in the Serchio River basin
D'AMATO AVANZI, GIACOMO ALFREDO;GIANNECCHINI, ROBERTO;PUCCINELLI, ALBERTO
2010-01-01
Abstract
The Serchio river basin (about 1600 km2 wide), includes hilly and mountainous areas, where historical towns lie together with industries, factories and tourist facilities, linked by well- developed infrastructures. The geological and geomorphological settings of the basin, the severe climatic conditions favour hydro- geological instability. Frequently heavy and\or relentless rainfall caused the Serchio River and its tributary to overflow, life- threatening and exposing to severe danger towns, resorts, factories and roads. Many landslides occur causing severe damages, high hazard and risk. This situation wholly justifies efforts to improve knowledge of stream dynamics, inundation recurrence and floodplain geomorphological evolution in high risk valley floor areas. Since 2006, the Serchio River Basin Authority (Italian Department of the Environment) has commissioned a LiDAR (Light Detection and Ranging) survey into the valley floor of the Serchio River and along some of its major tributaries, in order to improve knowledge of stream dynamics, to analyse and monitor the territory of jurisdiction. The LiDAR aerial mapping constitutes an innovative and effective instrument for advanced hydrologic and geomorphological assessment. High precision Digital Surface Model (DSM) completed with buildings and vegetation, a filtered DSM obtained by removing vegetation, and a Digital Terrain Model (DTM) derived from the DSM by post-processing, allowed for hydrologic modelling and geomorphological mapping, almost unfeasible by the regional technical map, nor on aerial photos. Multi-temporal aerial photogrammetric analysis was also performed in order to compare the digital model with the photorealistic model and match them together. The outcome of this study is a step forward into hydrologic and geomorphological assessment of floodplain dynamics and evolution., with particular regard to stream erosion activity, flooded areas reconstruction and mapping. Also, the most evident ransformation of the floodplain due to the human activities, such as buildings enlargement, landfill, stores of wasted and\or buildings materials, were identified and monitored.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
