Channel adjustments in the lower Guadalquivir River (southern Spain) over the last 250 years

El estudio de las inundaciones históricas en Sevilla a través de fuentes periodísticas (siglo XX)

“…Con todo ello, la ciudad parecía estaría protegida de las avenidas recurrentes y catastróficas de otros tiempos, pudiendo desplazar el riesgo de inundación a los sectores emplazados fuera de los límites del muro de contención. En la llanura, estas actuaciones hidráulicas se tradujeron en la reducción del espacio inundable en Sevilla entre el 30 y el 50%, el aumento de la pendiente del río y su profundidad, la desaparición de áreas de sedimentación en meandros, la reducción de la movilidad lateral del cauce y la mayor rapidez en la transmisión de los efectos de la marea (García Martínez y Baena, 2006;Baena et al, 2016;Baena et al, 2019).…”

Assessment of the Impact of Sand Mining on Bottom Morphology in the Mekong River in An Giang Province, Vietnam, Using a Hydro-Morphological Model with GPU Computing

“…In the process of increasing urbanization, the demand for extensive construction material is becoming a concern for infrastructure. To meet the demands for construction material, several sand mines on the river have been operating and have produced many impacts on the environment and river morphology [1][2][3][4][5]. Numerous studies have demonstrated that sand mining in alluvial rivers causes disturbances within geomorphic processes, bottom revolutions, and their functions [2,4,6].…”

Channel processes of a large alluvial river under human impacts

“…In other cases, the capacity is increased by increased runoff due to land cover changes or climate (Beechie et al, 2008). Conversely, a decrease in the sediment supply may be due to urbanization (Booth, 1990;Whitney et al, 2015); afforestation (Lach and Wyżga, 2002;Downs and Piégay, 2019), in-channel sediment mining (Rinaldi et al, 2005;Wyżga, 2007;Martín-Vide et al, 2010;Sanchis-Ibor et al, 2017); base-level decrease (Ben Moshe et al, 2008;Bowman et al, 2010;Edwards et al, 2016); artificial cut-offs and channelization (Parker and Andres, 1976;Simon, 1989;Rinaldi and Simon, 1998;Wyżga, 2007); dam and reservoir construction ( Edwards et al, 2016;Zhou et al, 2018;Baena-Escudero et al, 2019); bank stabilization (Petit et al, 1996;Thompson et al, 2016); and subduction related uplifts (Righter et al, 2010). In the Wisloka, a montane river in Poland, landuse changes caused up 2 m incision over a period of almost 60 years (Lach and Wyżga, 2002).…”

“…They are usually localized and influence a rapid response from the river (Fryirs and Brierley, 2012). Examples include the construction of dams/reservoirs (Nelson et al, 2013;Piqué et al, 2016;Topping et al, 2018;Williams and Wolman, 1984;Xia et al, 2014;Yang et al, 2019;Zhou et al, 2018;Ziegler et al, 2014b), sand/gravel mining (Martín-Vide et al, 2010;Petit et al, 1996;Picco et al, 2017;Rinaldi et al, 2005;Sanchis-Ibor et al, 2017), water extraction or diversion (Petts and Gurnell, 2013;Wang and Xu, 2016), removal of riparian vegetation (Domer et al, 2019;Macfarlane et al, 2017), channelization, artificial cutoffs and channel straightening (Baena-Escudero et al, 2019;Li and Gao, 2019;Roberge, 2002;Smith and Winkley, 1996;Tiron Dutu et al, 2019), construction of bank stabilization structures including revetment and groynes , in-channel infrastructure such as bridge piers (Roberge, 2002;Trueheart et al, 2020;, and construction of embankments (Earchi et al, 1995;Lehotský et al, 2010;Provansal et al, 2014;Vázquez-Tarrío and Menéndez-Duarte, 2014).…”

“…The disconnection of floodplains as a result of the construction of levees will therefore affect the sinuosity as the needed silt/clay content are reduced. Although direct interventions have implications downstream, artificial cutoffs have been found to have an upstream incision migration with rates of up to 0.6 m/y, while aggradation rates of up 0.12 m/y occurred downstream (Simon, 1989;Baena-Escudero et al, 2019). In the long-term however, both upstream and downstream sections experienced aggradation.…”