The Volturno Plain is one of the largest and most susceptible to coastal hazards Italian alluvial plain, characterized by both natural and human induced subsidence. The study bases on processing of SAR interferometry Permanent Scatterer (PS-InSAR) datasets, related to almost two decades (June 1992 - September 2007), and presents a vertical deformation map, derived by combination of both ascending and descending orbits of SAR datasets, which provides new insights into the areal variability of short-term decadal ground deformation (subsidence/uplift) of Volturno plain. The vertical deformation values derived by PS-InSAR data processing shows that the Volturno river plain is characterized by a complex trend of vertical ground deformation, characterized by strong subsidence in the central axial sectors, and by moderate to light subsidence in the plain, that is bounded eastward by a slightly uplifting sector with values up to + 50 mm. In detail, along the Volturno river, between Castel Volturno and Capua, there are several zones characterized by strong subsidence values (from - 380 mm to - 200 mm), while the area of the Volturno river mouth shows subsidence values up to - 50 /- 100 mm. In the other sectors of the plain, a general condition of moderate subsidence (lower than - 50 mm) or stability (from -10 to +10 mm of displacement values) is present. The subsidence of the plain can be mainly considered a natural process due to the compaction of the sediments, and the human influence (water exploitation, urbanization, etc.) can be considered an additional factor that can justify some spots in the plain where the subsidence is higher than the surrounding zone. The Volturno area resulted an excellent natural laboratory to calibrate the potential of PS data processing in active subsidence areas. The study of subsidence in Volturno plain is relevant for further studies of river flood and coastal inundation hazard assessment
Subsidence Trends of Volturno River Coastal Plain (Northern Campania, southern Italy) Inferred by SAR Interferometry Data
Fabio Matano;Marco Sacchi;
2017
Abstract
The Volturno Plain is one of the largest and most susceptible to coastal hazards Italian alluvial plain, characterized by both natural and human induced subsidence. The study bases on processing of SAR interferometry Permanent Scatterer (PS-InSAR) datasets, related to almost two decades (June 1992 - September 2007), and presents a vertical deformation map, derived by combination of both ascending and descending orbits of SAR datasets, which provides new insights into the areal variability of short-term decadal ground deformation (subsidence/uplift) of Volturno plain. The vertical deformation values derived by PS-InSAR data processing shows that the Volturno river plain is characterized by a complex trend of vertical ground deformation, characterized by strong subsidence in the central axial sectors, and by moderate to light subsidence in the plain, that is bounded eastward by a slightly uplifting sector with values up to + 50 mm. In detail, along the Volturno river, between Castel Volturno and Capua, there are several zones characterized by strong subsidence values (from - 380 mm to - 200 mm), while the area of the Volturno river mouth shows subsidence values up to - 50 /- 100 mm. In the other sectors of the plain, a general condition of moderate subsidence (lower than - 50 mm) or stability (from -10 to +10 mm of displacement values) is present. The subsidence of the plain can be mainly considered a natural process due to the compaction of the sediments, and the human influence (water exploitation, urbanization, etc.) can be considered an additional factor that can justify some spots in the plain where the subsidence is higher than the surrounding zone. The Volturno area resulted an excellent natural laboratory to calibrate the potential of PS data processing in active subsidence areas. The study of subsidence in Volturno plain is relevant for further studies of river flood and coastal inundation hazard assessmentI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
