Las explotaciones de áridos como factor modificador de los cauces fluviales naturales

Calvo, Juan M. Tena; Collado, Juan Miguel A. Mandado; García-Anquela, José A.

doi:10.18172/cig.945

Cited by 3 publications

(2 citation statements)

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“…Sin embargo, las actividades humanas (i.e. presas y actuaciones en el cauce como la construcción de escolleras y las extracciones de áridos) y otros procesos, como los cambios en los usos del suelo de la cuenca, alteran esta transferencia de sedimentos aguas abajo (Williams y Wolman, 1984;García-Anquela et al, 1985;Kondolf, 1994).…”

Section: Introductionunclassified

Efectos de las extracciones de áridos sobre el transporte de sedimentos en suspensión en ríos de montaña (alto río Cinca, Pirineo Central)

Béjar

Vericat

Nogales

et al. 2018

CIG

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This paper examines the effects of gravel mining on the suspended sediment transport in the Upper River Cinca (Central Pyrenees). Discharge, sediment transport and sediment grain-size distribution were measured, sampled and further determined in five monitoring sections along a 5-km river reach. Samples were taken at a section upstream from the mined area (i.e. reference section) and in four sections downstream (0, 200, 500 and 1500 meters). The results show that sediment concentrations downstream from the target site were up to one order of magnitude higher than in the reference section. Average concentrations during the impact were similar to those observed during floods, with maximum values attaining 6 g/l. Total load ranged from 2.2 to 17 Mg/day between sections; these values include the effects of the earth-moving works performed before the mining started. Concentrations at the lowermost section of the study reach were similar to those observed at the upstream reference section, suggesting that most of the suspended material was deposited in the channel. The transported material was coarse than that sampled under reference conditions; nevertheless, largest particles settled quickly, suggesting a selective transport downstream. This study constitutes a first step towards a better understanding of local sediment dynamics in rivers affected by maintenance works and related activities, such as gravel mining, and, overall, supports the comprehensive assessment of the effects of human actions on channel morphodynamics and the ecological functioning of mountain fluvial systems.

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Section: Introductionunclassified

Efectos de las extracciones de áridos sobre el transporte de sedimentos en suspensión en ríos de montaña (alto río Cinca, Pirineo Central)

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Vericat

Nogales

et al. 2018

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“…3d). This anthropic impact was mainly concentrated on the Gállego and Ebro rivers, as shown by García Anquela et al (1985) and Marcos González (1991). The changes were accompanied by defensive works, such as concrete dykes, gabions, rock breakwaters, and earth levees.…”

Section: The Recent Evolution Of the Gállego Rivermentioning

confidence: 84%

Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate

Peña-Monné

Longares-Aladrén

Rubio-Fernández

et al. 2020

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The lower Gállego River has been strongly degraded since the 1960s due to human activity (gravel mining, dump accumulation, channeling works), which has produced a deep channel incision. Although these human-driven processes are usually reported in fluvial bibliography, in this case, more complex results are observable. For instance, regarding the depth and incision rates, we observed no relationship between the most anthropically impacted areas and the sections with the deepest incisions; moreover, the deepening process continues 40 years after the human interventions ceased. The reason for this maladjustment is the role played by the exhumation of the underlying Pleistocene substrate, affected by the synsedimentary processes of karstification. The appearance of paleodolines filled with fine sediments on the incision bottom and sides is the main factor conditioning the continuity and magnitude of the process. Besides, these paleodepressions direct the river dynamics and course, thus favoring its widening when they appear and causing the development of a new riverbed (Qt13) while the 1960s floodplain (Qt12) is becoming an old terrace located between 5 and 11 m above the new alluvial bottom. There are no previous records about this kind of consequences in the regional fluvial dynamics.

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Espacios naturales de ribera en el municipio de Zaragoza

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2017

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Las explotaciones de áridos como factor modificador de los cauces fluviales naturales

Cited by 3 publications

References 0 publications

Efectos de las extracciones de áridos sobre el transporte de sedimentos en suspensión en ríos de montaña (alto río Cinca, Pirineo Central)

Efectos de las extracciones de áridos sobre el transporte de sedimentos en suspensión en ríos de montaña (alto río Cinca, Pirineo Central)

Dynamic changes in the lower Gállego River (Ebro Basin, NE Spain) and their relationship with anthropic activities and the quaternary substrate

Espacios naturales de ribera en el municipio de Zaragoza

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