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UID:pretalx-foss4g-it-2023-UWZRTN@talks.staging.osgeo.org
DTSTART;TZID=GMT:20230612T173000
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DESCRIPTION:For Veneto Region\, the year 2022 was affected by anomalies in 
 terms of average temperature and recorded rainfall\, compared to the clima
 tic average of the last thirty years. The occurrence of these climatic con
 ditions highlighted the inevitable negative effects for the environment\; 
 in particular\, water resources were affected by this combination of clima
 tic criticalities\, both in terms of rivers’ flow rate and underground w
 ater flows\, also due to the poor snow accumulations recorded in the Alps 
 during the winter period.\nCritical profiles in terms of surface runoff ha
 ve been highlighted on various rivers and streams\, particularly in the su
 mmer period. The main Italian river\, the Po\, was also affected by a wate
 r flow decrease in 2022\, making evident the increase in the surfaces char
 acterized by the presence of sand islands\, visible along the river path.\
 nThis work\, carried out by the Territorial Planning Department of the Ven
 eto Region\, aimed at a quantitative analysis of the surface covered by sa
 nd islands and surface water in a sufficiently representative area of the 
 Po basin.\nFor the purposes of this study\, the area included between the 
 municipalities of Occhiobello (RO) and Ferrara was analysed (border area b
 etween Veneto and Emilia Romagna regions\, where Po river flows). The anal
 ysis was carried out for the month of July 2022\, comparing the data obtai
 ned with those relating to previous years (2020 and 2021).\nIn order to id
 entify the islands of sand\, multispectral Sentinel-2 satellite images wer
 e analysed\, taking into consideration the wavelengths of the visible (B02
 \, B03 and B04 bands)\, and that of the near infrared (B08 band). The area
  was then classified using supervised classification with the Random Fores
 t classification algorithm\, a methodology that allows to obtain high-prec
 ision classifications.\nConsidering the pixels’ size and the limits of t
 he supervised classification\, the precision of the analysis performed an 
 accuracy higher than 95%. The analysis remarks relevance for monitoring th
 e negative effects caused by the drought on the Po river. In the area unde
 r examination\, a constant decrease in the surface of surface water was ob
 served\, and a corresponding increase of natural sand islands. From the an
 alysis obtained\, thanks to the use of the classifier\, it is evident that
  the year 2022 was a year in which drought contributed to worsen the water
  stress for the Po river\, with evident consequences on the environment in
  terms of availability of the water resource and the rise of the salt wedg
 e near the river mouth. Moreover\, the study presented here confirms the i
 mportance of using satellite data and classification tools for monitoring 
 water bodies.
DTSTAMP:20260516T222803Z
LOCATION:Sala Videoconferenza @ PoliBa
SUMMARY:Evolution of the surface waters of the Po river in the 2020-22 peri
 od - a quantitative analysis of the drought effects with Sentinel-2 images
  - Carlo Masetto\, Niccolo' Tolio\, Eleonora Cagliero\, Benedetta Gori\, U
 mberto Trivelloni\, Alessandra Amoroso\, Laura Magnabosco
URL:https://talks.staging.osgeo.org/foss4g-it-2023/talk/UWZRTN/
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