Variability of in-channel sediment storage in a river draining highly erodible areas (the Isábena, Ebro Basin)

Piqué, Gemma; López‐Tarazón, José A.; Batalla, Ramón J.

doi:10.1007/s11368-014-0957-6

Cited by 39 publications

(31 citation statements)

References 17 publications

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“…Others have observed mixed patterns, arguing for the importance of cycles of vegetation growth and senescence (Heppell et al 2009) or the greater influence of flow conditions and local channel characteristics (Marttila and Kløve 2014). The latter authors also found that, in a catchment exploited for peat and wood in central Finland, the high volumes of sediment delivered by headwater tributaries were quickly conveyed downstream; similar dynamics have been reported in Mediterranean streams (Francke et al 2014;Piqué et al 2014). No seasonal trends were observed in the variations of sediment storage in the River Ehen.…”

Section: In-channel Sediment Storagementioning

confidence: 68%

“…Following López-Tarazón et al (2011) and Piqué et al (2014), sample data were then extrapolated to estimate total storage in the whole of the upper reach (i.e. between Ben Gill and the Gauging Station).…”

Section: Data Processing and Analysismentioning

confidence: 99%

“…Of these, the resuspension method first presented by Lambert and Walling (1988) is being used increasingly (e.g. Collins and Walling 2007a;López-Tarazón et al 2011;Piqué et al 2014); it has been shown to perform well across different types of substrate and provides valuable information on material stored in both the surface and subsurface zones, as well as its size characteristics (Duerdoth et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

et al. 2018

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Purpose A disconnected ephemeral tributary was reconnected to the regulated River Ehen (NW England) as part of a river restoration initiative, providing a renewed delivery of sediment to a highly stable and armoured channel. This paper (1) assesses spatial and temporal dynamics of suspended and stored sediments in the Ehen, (2) characterises the composition of stored sediment, (3) develops fine sediment budgets for downstream river reaches, and (4) assesses the controls on the storage of fine sediment in the riverbed. Materials and methods A 3-km study section in the upper part of the River Ehen was divided into two reaches. Suspended sediments were monitored at the downstream limits of each reach over a 2-year period. In-channel storage was measured in three morphological units within the upper reach, on 13 occasions over the same period. Samples were used to assess changes in volumes of stored fine sediment, as well as the grain sizes and organic content of the material. A time-lapse camera facing the confluence of the tributary was used to conceptualise different flow scenarios. These scenarios reflect the degree of synchronicity between flows in the main-stem and those in the tributary. Fine sediment budgets were developed for each reach to assess the relative contribution of different sources of sediment. Results and discussion The reconnection significantly affected suspended sediment loads in the Ehen. Bed storage increased twofold, with changes most evident in the slow-flowing morphological unit. Changes in the composition of stored sediment were less marked than changes in the quantity of material. Changes in bed storage were controlled by the degree of synchronicity between flows in the Ehen and those in the newly reconnected tributary. Results show that three generalised flow scenarios occur, with total asynchronicity between flows in the tributary and the Ehen being responsible for the main episodes of fine sediment deposition. Overall, the estimated sediment budgets provide insights into the importance of non-perennial sources of sediment in supply-limited systems such as the Ehen. Although bed storage values are within the range of those published for UK rivers, the increase observed since the reconnection, together with the persistence of a static pavement, highlights the ecologically critical conditions of the regulated main-stem River Ehen. Conclusions Intermittent sources control fine sediment transport dynamics in the upper River Ehen. In this regulated river, ongoing deposition associated with increased low-and medium-sized flow events exerts more of a control on bed storage than large but rare floods. Management actions to limit delivery of material from lateral sources could help prevent further deterioration of habitat conditions for biota sensitive to fine sediment. Given the ongoing adjustment in the newly reconnected tributary, continued monitoring is needed to capture further morphosedimentary response in the main-stem.

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Section: In-channel Sediment Storagementioning

confidence: 68%

Section: Data Processing and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

et al. 2018

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“…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

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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“…Once sediments reach the river network their residence time will be determined by the cycles of mobilization, in-channel sedimentation and remobilization (e.g. Charlton, 2007;López-Tarazón et al, 2011;Piqué et al, 2014). Inter-annual variability of the SDR is often considerable but can be also highly variable between catchments influenced by contrast sediment production processes (i.e.…”

Section: Introductionmentioning

confidence: 99%

Rainfall, runoff and sediment transport in a Mediterranean mountainous catchment

Tuset

Vericat

Batalla

2016

Science of The Total Environment

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Variability of in-channel sediment storage in a river draining highly erodible areas (the Isábena, Ebro Basin)

Cited by 39 publications

References 17 publications

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

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

Rainfall, runoff and sediment transport in a Mediterranean mountainous catchment

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