Sediment transport in two mediterranean regulated rivers

Lobera, Gemma; Batalla, Ramón J.; Vericat, Damià; López‐Tarazón, José A.; Tena, Álvaro

doi:10.1016/j.scitotenv.2015.08.018

Cited by 41 publications

(34 citation statements)

References 49 publications

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“…On the other hand, the specific SS yields obtained for both study years at FG1 (i.e., 4 and 18 t/km 2 /year, respectively for each year) and at FG2 (i.e., 0.7 and 1.9 t/km 2 /year) are similar to those obtained for other Mediterranean domains of similar characteristics in size, climate (i.e., mainly rainfall‐based flow regimes with a marked seasonality and usual torrentiality, hence hydraulically limited), and geology (i.e., sediment supply‐limited fluvial system). Such examples would be the Siurana River (in the unregulated section), which produced 11 t/km 2 /year (Lobera, Batalla, Vericat, López‐Tarazón, & Tena, ) or the Bosc and Campás gauging stations (Vernegá experimental catchment), delivering 0.1 and 0.7 t/km 2 /year respectively for the period 1993–1997 (Sala & Farguell, ) and 4.34 and 7.89 t/km 2 /year respectively for the period 2005–2009 (Pacheco, Farguell, Úbeda, Outeiro, & Miguel, ). However, these values can be considered as low or very low if they are compared either with similar‐sized unregulated Mediterranean catchments in the Iberian Peninsula (e.g., the Ribera Salada catchment, delivering 12 t/km 2 /year (Vericat & Batalla, ); the Tordera catchment, generating 78 t/km 2 /year (Batalla, Garcia, & Rovira, ); the Isábena catchment, producing 527 t/km 2 /year (López‐Tarazón, Batalla, Vericat, & Francke, ) or put in a wider context such as the classification made by Vanmaercke, Poesen, Verstraeten, de Vente, and Ocakoglu () for Europe's river catchments, in which both FG1 and FG2 would be classified at the bottom of the group of low sediment yield values (i.e., < 40 t/km 2 /year), demonstrating the low sediment availability of both catchments.…”

Section: Discussionmentioning

confidence: 99%

Exploring suspended sediment delivery dynamics of two Mediterranean nested catchments

López‐Tarazón

Estrany

2016

Hydrological Processes

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This paper investigates suspended sediment transport and dynamics of two nested agricultural lowland Mediterranean catchments with a difference of two orders of magnitude in the surface area (i.e., 1 and 264 km2). The effects of the drainage catchment area over the specific suspended sediment yield are assessed by using the nested approach over various timeframes. A detailed analysis of the rainfall–runoff–sediment transport relationships during the 2‐year study period shows that the hydrological and sedimentological responses were extremely variable for both catchments. Very low or no correlations were observed between the rainfall intensity and the selected hydrological variables and sediment loads. However, remarkable or high correlations were obtained between the rainfall intensity and the maximum and average suspended sediment concentrations, indicating that rainfall per unit time has little control on the hydrological response, but that, simultaneously, its high‐erosive power triggers sediment production, increasing the sedimentary response of the catchments. This study also illustrates how sediment is mainly transported during floods, producing predominantly clockwise hysteretic loops. Moreover, the small headwater catchment exerts a reduced (or even negligible) effect over the hydro‐sedimentary response of the larger downstream catchment, caused by the reduced sediment availability in a landscape with an inherent disconnection of the sediment pathways.

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Section: Discussionmentioning

confidence: 99%

Exploring suspended sediment delivery dynamics of two Mediterranean nested catchments

López‐Tarazón

Estrany

2016

Hydrological Processes

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“…La concentración media de sedimentos en suspensión para el periodo 2013-2015 es 0,09 g/l, alcanzando un máximo instantáneo de 17 g/l asociado a un caudal de 48 m 3 /s durante la crecida del 31/07/2015. Se trata de una concentración similar a las obtenidas por Lobera et al (2016a;2016b) …”

Section: El Tramo Alto Del Cincaunclassified

“…Si se comparan la C ss máxima obtenidas durante las actuaciones en el cauce con las obtenidas en eventos de crecida en el cercano río Ésera, la C SS máxima es mucho menor (i.e. C SS máxima en verano 27,8 g/l, Lobera et al, 2016b). Es interesante señalar también que las altas concentraciones alcanzadas durante los días de actuación en el cauce alteraron por ejemplo la deriva de macroinvertebrados en el tramo de estudio (para más detalles consultar Béjar et al, 2017).…”

Section: P a P E R A C C E P T E D P R E -P R I N T V E R S I O Nunclassified

“…meteorización de roca madre por procesos de hielo-deshielo en invierno y primavera), con periodos de transferencia del material al cauce fluvial por las lluvias y el deshielo en primavera y, finalmente, exportación del mismo por crecidas estivales y otoñales. Estos ciclos han estado descritos para cuencas vecinas a las del Cinca en los trabajos de López-Tarazón et al (2011), Piqué et al (2014, Lobera et al (2016b). Así, la generación y redistribución de sedimentos producida por las actuaciones en el cauce puede alterar este ciclo natural y algunas funciones ecosistémicas asociadas (como por ejemplo la freza de los peces o la deriva de invertebrados) en función de la época del año en la que se realicen.…”

Section: Consideraciones Finalesunclassified

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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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“…Thus, more reclamation is needed in areas affected by intense erosion processes to limit erosion effects in lowland areas (Gallart et al, ). This is particularly the case for badland areas, which are commonly the main sediment sources and runoff generating areas (Regüés et al, ; Nadal‐Romero & Regüés, ; Nadal‐Romero et al, , ; Cappadonia et al, ; Lobera et al, ).…”

Section: New Questions For An Old Problemmentioning

confidence: 99%

Ongoing and Emerging Questions in Water Erosion Studies

et al. 2016

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Soil erosion is a threat to food security, especially in regions where the area of arable land is shrinking dramatically because of soil degradation. Research on soil erosion expanded progressively throughout the 20th centu\ry, although a number of unresolved problems persist despite this issue being crucial for the environment and the welfare of society. Some basic unresolved issues, including the absence of a universally accepted definition of soil erosion and disagreement about how to measure it have contributed to a degree of scientific stagnation. Accurate prediction of the response of soils to disturbance is hampered by the dependence of the erosion process on the spatial scale involved, the time lag between the disturbance and the erosion response and the short periods for which data are typically available. We argue that devoting increased attention to the following environmental, demographic, political and societal issues will reinvigorate progress in the field. (i) The relationships between on‐site and off‐site consequences of soil erosion need to be elucidated if the economic and environmental costs are to be adequately assessed. (ii) Effective measures for soil conservation need to focus on spatial patterns of plant cover that reduce sediment connectivity, and most importantly on the relationships between hillslopes and sediment transfer in eroded channels. (iii) The scientific community must be able to identify early warning signs of critical transitions, if irreversible soil degradation is to be prevented. (iv) Consensus needs to be reached concerning the contribution of soil erosion to the carbon cycle. (v) The consequences of climate change on erosion and sediment transport should be investigated in depth. (vi) The general society needs to perceive soil erosion as a critical matter requiring an urgent response. Copyright © 2016 John Wiley & Sons, Ltd.

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Sediment transport in two mediterranean regulated rivers

Cited by 41 publications

References 49 publications

Exploring suspended sediment delivery dynamics of two Mediterranean nested catchments

Exploring suspended sediment delivery dynamics of two Mediterranean nested catchments

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

Ongoing and Emerging Questions in Water Erosion Studies

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