In this research, we present the lower Scrivia River planform changes occurred from 1878 to 2016. Furthermore, we illustrate the channelization-works development and the land-use changes registered close to the riverbed after the 1950s. The Scrivia River is among the most relevant right-bank tributaries of the Po River; it is about 90 km long and origins from the Ligurian-Piedmontese Appennines. The study reach is about 16 km long, close to the Po River, and generally shows a single-thread, sinuous and deep-incised channel. Nowadays the lower Scrivia River presents many bank retreat processes that involve surrounding areas, creating serious management issues. The aim of this research is to outline in detail the active-channel morphological evolution over the last 100–150 years, and characterize channelization and riverscape changes, with a specific focus on the occupation of the areas of fluvial pertinence. A quantitative multi-temporal analysis supported by field surveys and based on historical maps, aerial photographs and satellite images was performed in a GIS environment through automated and semi-automated procedures. The active channel experienced a well-defined sequence of morphological evolutionary phases. They were substantially characterized by a gradual increase of the active-channel stability and a reduction of the active-channel width, up to the end of the 20th century. Since the 2000s, morphological evolutionary trends have changed. Anthropic pressures on the river system, and in particular bank protections, are documented to have played a key role in driving the active-channel changes, and consequently, the near-riverbed land-property and land-use changes. In this respect, on the basis of cadastral data, the past legal framework is also identified as a relevant conditioning factor of the river-corridor morphological evolution. The ongoing dynamics most probably represent the morphological response to the documented, severe anthropic alterations, and are currently raising serious management issues.
Bank Protection, Channel Planform Changes, Channelization, GIS, Italian Rivers, Land Property, Land Use, Regulations, River Corridor, Scrivia River
 Scorpio, V., Aucelli, P.P.C., Giano, S.I., Pisano, L., Robustelli, G., Rosskopf, C.M. & Schiattarella M., River channel adjustments in Southern Italy over the past 150 years and implications for channel recovery. Geomorphology, 251, pp. 77–90, 2015.
 Pellegrini, L., Maraga, F., Turitto, O., Audisio, C. & Duci, G., Evoluzione morfologica di alvei fluviali mobili nel settore occidentale del bacino padano. Italian Journal of Quaternary Sciences, 21, pp. 251–266, 2008.
 Surian, N., Rinaldi, M., Pellegrini, L., Audisio, C., Maraga, F., Teruggi, L., Turitto, O. & Ziliani, L., Channel adjustments in northern and central Italy over the last 200 years. In Management and Restoration of Fluvial Systems with Broad Historical Changes and Human Impacts, eds. James, L.A., Rathburn, S.L. & Whittecar, G.R., Geological Society of America Special Paper, 451, Geological Society of America: Boulder, CO, pp. 83–95, 2009.
 Surian, N. & Rinaldi, M., Morphological response to river engineering and management in alluvial channels in Italy. Geomorphology, 50, pp. 307–326, 2003.
 Gurnell, A., Surian, N. & Zanoni, L., Multi-thread river channels: A perspective on changing European alpine river systems. Aquatic Sciences, 71, pp. 253–265, 2009.
 Mandarino, A., Maerker, M. & Firpo M., Channel planform changes along the Scrivia River floodplain reach in northwest Italy from 1878 to 2016. Quaternary Research, 91(2), pp. 620–637, 2019.
 Cencetti, C., De Rosa, P. & Fredduzzi, A., Geoinformatics in morphological study of River Paglia, Tiber River basin, Central Italy. Environmental Earth Sciences, 76, p. 128, 2017.
 Comitato per la difesa e la rivalutazione del Po, Italia Nostra Piemonte, Lega per l’Ambiente Piemonte, Pro Natura Piemonte & WWF Piemonte, I Fiumi Italiani e le Calamità Artificiali, eds. Ente Riserve Naturali Garzaia di Valenza e Garzaia di Bosco Marengo: Valenza Po, 1988. (in Italian).
 Cannata, P.G., La scienza dell’acqua. La Città, 9(2), 1995. (in Italian).
 Ercolini, M., Dalle esigenze alle opportunità: la difesa idraulica fluviale occasione per un progetto di “paesaggio terzo”, PhD Thesis, Firenze, 2006. (in Italian).
 Ludovici, A.A. (eds), Salviamo i fiumi. Guida pratica per le amministrazioni comunali lombarde, WWF Lombardia: Milano, 1997. (in Italian).
 Mandarino, P., Una speranza per i fiumi: la legge Cutrera, L’InformaFiume—Notiziario del Parco Fluviale del Po e dell’Orba, 1, p. 11, 1995. (in Italian).
 Mandarino, P., Appartengono al demanio pubblico i terreni abbandonati dai fiumi. Territorio e Provincia, 1994. (in Italian).
 Mandarino, P., Norme per la tutela ambientale dei fiumi, torrenti, acque pubbliche. Territorio e Provincia, 1994. (in Italian).
 Clerici, A., Perego, S., Chelli, A. & Tellini, C., Morphological changes of the floodplain reach of the Taro River (Northern Italy) in the last two centuries. Journal of Hydrology, 527, pp. 1106–1122, 2015.
 Bollati, I.M., Pellegrini, L., Rinaldi, M., Duci, G. & Pelfini, M., Reach-scale morphological adjustments and stages of channel evolution: The case of the Trebbia River (northern Italy). Geomorphology, 221, pp. 176–186, 2014.
 Regalzi, E., Scrivia, il primo parco. La Stampa - Alessandria. July 14, 1989. (in Italian).
 Brunetti, A., Ormai imminente il ‘Parco dello Scrivia’. Il Gazzettino, 5, 1987. (in Italian).
 Brunetti, A., Speciale Parco dello Scrivia. Il Gazzettino, 6, 1987. (in Italian).
 Pepe, G., Mandarino, A., Raso, E., Cevasco, A., Firpo, M. & Casagli, N., Extreme flood and landslides triggered in the Arroscia Valley (Liguria Region, Northwestern Italy) during the November 2016 rainfall event. In Engineering Geology for a Sustainable World, eds. Shakoor, A. & Cato, K., IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018, Volume 1, Springer, Cham, pp. 171–175, 2019.
 Rapp, C.F. & Abbe, T.B., A Framework for Delineating Channel Migration Zones. Ecology Publication No. 03–06–027, Washington State Department of Ecology and Department of Transportation, Lacey, WA, 2003.