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Channel Changes and Controlling Factors over the Past 150 Years in the Basento River (Southern Italy)
Open AccessFeature PaperArticle

Short-Term GIS Analysis for the Assessment of the Recent Active-Channel Planform Adjustments in a Widening, Highly Altered River: The Scrivia River, Italy

1
Department of Earth, Environment and Life Sciences, University of Genova, Corso Europa 26, 16132 Genova, Italy
2
Geoscape Soc. Coop., Geo-Environmental Consulting, Via Varese 2, 16122 Genova, Italy
3
Department of Earth and Environment Sciences, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 514; https://doi.org/10.3390/w12020514 (registering DOI)
Received: 30 December 2019 / Revised: 10 February 2020 / Accepted: 11 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue GIS Application in Fluvial Geomorphology and Landscape Changes)
From the 1990s onwards several Italian rivers have experienced a recent phase characterized by active-channel widening and, generally, by bed-level stability or slight aggradation. However, its triggering factors and its diffusion, along with the relationship between active-channel planform dynamics and vertical adjustments, are still quite debated and only few studies are available. This research deals with the active-channel planform changes occurred along the Scrivia River floodplain reach (NW Italy) over the period 1999–2019 and it aims at investigating in detail the ongoing geomorphological processes under the river management perspective. The study is based on a quantitative multitemporal analysis of aerial photographs and satellite images performed in a GIS environment and supported by field surveys. The outcomes revealed a generalized trend of gentle active-channel widening together with widespread bank instability and several (26% of total banks) intense and localized bank retreats involving both the modern floodplain and the recent terrace. In the investigated 20-year period, the active-channel area has increased by 22.7% (from 613.6 to 753.0 ha), its mean width by 25% (from 151.5 to 189.3 m), whereas no relevant length variations have been noticed. These morphological dynamics have been more or less pronounced both at reach scale and over time. The extreme floods occurred in the investigated period can be considered the most important triggering factor of the active-channel planform changes, most probably together with an increase of the reach-scale unit stream power due to changes in the channel geometry occurred over the 20th century. View Full-Text
Keywords: channel changes; channel widening; controlling factors; river management; evolutionary trajectories; Italian rivers; Scrivia River channel changes; channel widening; controlling factors; river management; evolutionary trajectories; Italian rivers; Scrivia River
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Mandarino, A.; Pepe, G.; Maerker, M.; Cevasco, A.; Brandolini, P. Short-Term GIS Analysis for the Assessment of the Recent Active-Channel Planform Adjustments in a Widening, Highly Altered River: The Scrivia River, Italy. Water 2020, 12, 514.

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