Analysis of the degree of contamination and evolution in the last 100 years of the composition of the bed sediments of the Anllóns Basin

Rey, Rosa Devesa; Barral, María Teresa; Jouanneau, Jean-Marie; Dı́az-Fierros, F.

doi:10.1007/s12665-010-0457-y

Cited by 17 publications

(8 citation statements)

References 45 publications

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“…These authors identified urban land use and population density as more important influences on the bed sediment chemistry. Similar patterns have been observed in previous studies in the Anllóns basin, on nutrients (DevesaRey et al 2009) and metals (Devesa-Rey et al 2010), in which no consistent increase was observed along the watercourse. Rather, fluctuations occurred in response to the proximity of pollution sources or changes in the water flow.…”

Section: Evaluation Of Total Phosphorus Concentrations In the Soil Ssupporting

confidence: 91%

Phosphorus transfer across boundaries: from basin soils to river bed sediments

et al. 2011

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Purpose The study of phosphorus (P) transfer from soils to rivers is a subject of interest as there is a clear relation between land use and water quality. P transfer in the soil/sediment system was evaluated by comparing the concentrations of total (P T ) and bioavailable P (P A ). Materials and methods Phosphorus concentrations were measured in three different compartments following the natural transport route in a basin: soils, suspended and riverbed sediments. Soils were sampled from five different types of land cover: cropped land, forest, pasture, river banks and road taluses (roadside open earthen ditches). Samples were taken from two different sub-basins: the Grande and the upper Anllóns sub-basins. Results and discussion The highest concentrations of P were found in the suspended sediments, followed by the riverbed sediments and the soils. The cropped and pasture soils contained the highest amounts of P. The P A /P ratio was very low in the soils (<0.3), but was significantly higher in the sediments, particularly in the suspended sediments (0.67). The concentration of P A was also significantly higher in the suspended sediments and riverbed sediments than in the river basin soils, with concentration factors of 300% for P and 2,600% for P A , either in suspended and bed sediments being slightly higher in the suspended than in the bed sediments , which suggests the potential environmental risk of P transfer to the river courses via soil. Conclusions Comprehensive studies involving P transfer across soils-suspended sediments-bed sediments are scarce, highlighting the innovative nature of the present study. The results obtained will allow the evaluation of the impact of different types of land use on the sustainability of the aquatic ecosystem at a catchment scale.

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Section: Evaluation Of Total Phosphorus Concentrations In the Soil Ssupporting

confidence: 91%

Phosphorus transfer across boundaries: from basin soils to river bed sediments

et al. 2011

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“…Additionally, most of metals follow the same trend in both fractions, indicating that both are affected by the same sources of contamination, although in a different degree. The same trend was also observed by Devesa-Rey et al (2010b) in the Anllóns River (Spain).…”

Section: Origin and Intensity Of The Contaminationsupporting

confidence: 81%

Influence of anthropogenic inputs and a high-magnitude flood event on metal contamination pattern in surface bottom sediments from the Deba River urban catchment

Martínez‐Santos

Probst

García-García

et al. 2015

Science of The Total Environment

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The purpose of this study was to assess the influence of anthropogenic factors (infrastructure construction and industrial and wastewater inputs) and hydrological factors (high-magnitude flood events) on metal and organic contamination and on the source variability of sediments taken from the Deba River and its tributaries. The pollution status was evaluated using a sequential extraction procedure (BCR 701), enrichment factor, individual and global contamination factors and a number of statistical analysis methods. Zn, Cu and Cr were found to have significant input from anthropogenic sources, with moderately severe enrichment, together with an extremely high potential risk of contamination. The principal scavenger of Cu and Cr was organic matter, whereas Zn was uniformly distributed among all non-residual fractions. For Fe, the anthropogenic contribution was more obviously detected in bulk sediments (<2 mm) than in fine fractions (<63 μm). Finally, the recent construction of a rail tunnel traversing Wealden Facies evaporites, together with intense rainfalls, was the main reason for the change in the source variability of bottom sediments and metal distribution in headwaters. The occurrence of a high-magnitude flood event resulted in a washout of the river bed and led to a general decrease in fine-grained sediment and metal concentrations in labile fractions of channel-bottom sediments, and a consequent downstream transfer of the pollution.

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“…), is 516 km 2 (Devesa‐Rey et al ) and drains a predominately igneous and metamorphic hinterland (Arribas et al ). The dominant land uses are pastoral and arable agriculture and forestry (Devesa‐Rey et al ; Costas et al ). There are two towns in the region, Carballo and Ponteceso, and a small coastal town at Laxe.…”

Section: Study Areamentioning

confidence: 99%

“…The Anllóns River flows downstream into the Anllóns Estuary, where it passes into the Ría de Corme y Laxe and then into the mid‐Atlantic Ocean (Costas et al ). The river is approximately 60 km in length and is undammed (Devesa‐Rey et al ). The average flow of the river is 11.9 m 3 s −1 which can vary at the extreme between 80 m 3 s −1 and 1 m 3 s −1 from the wet season to the dry season (Varela et al ; Costas et al ).…”

Section: Study Areamentioning

confidence: 99%

Extensive evaporation in a modern temperate estuary: Stable isotopic and compositional evidence

Barrie

Worden

Barrie

et al. 2015

Limnology & Oceanography

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Estuaries have long been recognized as sites of major compositional fluctuations that can have a range of effects including mineral growth in the water column and in the underlying estuarine sediment. We have studied chloride and sodium concentrations and stable isotopes (H and O) from a suite of estuarine waters from the temperate Anll ons estuary in NW Spain to assess the complexity of estuarine mixing process. Water samples were collected hourly from in estuary sites over three consecutive days and end-member samples were collected on each sampling day. Evaporative concentration of the estuarine waters is demonstrated by the maximum concentration of geochemically conservative chloride being as much as 17.5% greater in the estuary than in the local seawater. Relative to chloride concentration, both d 2 H and d 18 O values of estuary waters tend to be more enriched than would be expected for the simple physical mixing of river water and seawater. These patterns can only be plausibly accounted for through evaporation affecting the water, concentrating the chloride and causing isotope fractionation. We have modelled the effects of evaporation on chloride concentration and the stable isotopes in the estuary; the results closely match the distribution of analytical data suggesting that up to 40% evaporation has happened. We have demonstrated that two thirds of estuarine water samples analysed underwent between 5% and 40% evaporation. This previously unreported degree of evaporation in estuaries has important implications for any processes that is effected by the consequent degree of elevated solute concentration.Estuaries are locations of complex water and sediment mixing patterns due to the twice-daily influx of seawater (Berner and Berner 2012). Estuarine sediments and the signatures that result from the competing influences of fluvial and marine systems are of interest in their own right and as analogues to understand ancient, deeply buried estuarine sandstones. Daily variations in water chemistry through tidal cycles result in complex systems of water mixing, and sediment deposition and resuspension (Pritchard

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Analysis of the degree of contamination and evolution in the last 100 years of the composition of the bed sediments of the Anllóns Basin

Cited by 17 publications

References 45 publications

Phosphorus transfer across boundaries: from basin soils to river bed sediments

Phosphorus transfer across boundaries: from basin soils to river bed sediments

Influence of anthropogenic inputs and a high-magnitude flood event on metal contamination pattern in surface bottom sediments from the Deba River urban catchment

Extensive evaporation in a modern temperate estuary: Stable isotopic and compositional evidence

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