Multi-temporal GIS analysis of topographic maps and aerial photographs along with topographic and geomorphologicalsurveys are used to assess evolutionary trends and key control factors of channel adjustments forfive major rivers in southern Italy (the Trigno, Biferno, Volturno, Sinni and Crati rivers) to support assessmentof channel recovery and river restoration.Three distinct phases of channel adjustment are identified over the past 150 years primarily driven by human disturbances.Firstly, slight channel widening dominated from the last decades of the nineteenth century to the1950s. Secondly, from the 1950s to the end of the 1990s, altered sediment fluxes induced by in-channel miningand channel works brought aboutmoderate to very intense incision (up to 6–7m) accompanied by strong channelnarrowing (up to 96%) and changes in channel configuration from multi-threaded to single-threaded patterns.Thirdly, the period from around 2000 to 2015 has been characterized by channel stabilization and localwidening. Evolutionary trajectories of the rivers studied are quite similar to those reconstructed for other Italianrivers, particularly regarding the second phase of channel adjustments and ongoing transitions towards channelrecovery in somereaches. Analyses of river dynamics, recovery potential and connectivity with sediment sourcesof the study reaches, framed in their catchment context, can be used as part of awider interdisciplinary approachthat views effective river restoration alongside sustainable and risk-reduced river management
River channel adjustments in Southern Italy over the past 150 years and implications for channel recovery
ROBUSTELLI, Gaetano;
2015-01-01
Abstract
Multi-temporal GIS analysis of topographic maps and aerial photographs along with topographic and geomorphologicalsurveys are used to assess evolutionary trends and key control factors of channel adjustments forfive major rivers in southern Italy (the Trigno, Biferno, Volturno, Sinni and Crati rivers) to support assessmentof channel recovery and river restoration.Three distinct phases of channel adjustment are identified over the past 150 years primarily driven by human disturbances.Firstly, slight channel widening dominated from the last decades of the nineteenth century to the1950s. Secondly, from the 1950s to the end of the 1990s, altered sediment fluxes induced by in-channel miningand channel works brought aboutmoderate to very intense incision (up to 6–7m) accompanied by strong channelnarrowing (up to 96%) and changes in channel configuration from multi-threaded to single-threaded patterns.Thirdly, the period from around 2000 to 2015 has been characterized by channel stabilization and localwidening. Evolutionary trajectories of the rivers studied are quite similar to those reconstructed for other Italianrivers, particularly regarding the second phase of channel adjustments and ongoing transitions towards channelrecovery in somereaches. Analyses of river dynamics, recovery potential and connectivity with sediment sourcesof the study reaches, framed in their catchment context, can be used as part of awider interdisciplinary approachthat views effective river restoration alongside sustainable and risk-reduced river management| File | Dimensione | Formato | |
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Scorpio et al 2015.pdf
Open Access dal 02/07/2017
Descrizione: The publisher version is available at https://www.sciencedirect.com/science/article/pii/S0169555X15300738?via=ihub; DOI: 10.1016/j.geomorph.2015.07.008
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