COVID-19 lockdown measures reveal human impact on water transparency in the Venice Lagoon
Fecha
2020Autor
Braga, Federica
Scarpa, Gian Marco
Brando, Vittorio Ernesto
Manfè, Giorgia
Zaggia, Luca
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Resumen
The lagoon of Venice has always been affected by the regional geomorphological evolution, anthropogenic
stressors and global changes. Differentmorphological settings and variable biogeophysical conditions characterize
this continuously evolving system that rapidly responds to the anthropic impacts. When the lockdown measures
were enforced in Italy to control the spread of the SARS-CoV-2 infection on March 10th 2020, the ordinary
urbanwater traffic aroundVenice, one of themajor pressures in the lagoon, cameto a halt. This provided a unique
opportunity to analyse the environmental effects of restrictions to mobility on water transparency. Pseudo truecolour
composites Sentinel-2 satellite imagery proved useful for qualitative visual interpretation, showing the reduction
of the vessel traffic and their wakes from the periods before and during the SARS-CoV-2 outbreak. A
quantitative analysis of suspended matter patterns, based on satellite-derived turbidity, in the absence of traffic
perturbations, allowed to focus on natural processes and the residual stress fromhuman activities that continued
throughout the lockdown.We conclude that the high water transparency can be considered as a transient condition
determined by a combination of natural seasonal factors and the effects of COVID-19 restrictions.
Palabras clave
Water transparency; Suspended sediments; Sentinel-2; Vessel traffic; Satellite imageryEnlace al recurso
https://doi.org/10.1016/j.scitotenv.2020.139612Colecciones
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