Variation of dissolved and particulate metal(loid) (As, Cd, Pb, Sb, Tl, Zn) concentrations under varying discharge during a Mediterranean flood in a former mining watershed, the Gardon River (France)

Resongles, Eléonore; Casiot, Corinne; Freydier, Rémi; Gall, Marion Le; Elbaz-Poulichet, Françoise

doi:10.1016/j.gexplo.2015.07.010

Cited by 35 publications

(26 citation statements)

References 55 publications

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“…PC1 explains 63% of the total variation of the data. It is also interesting to note that lead, turbidity and iron are found close to each other, indicating that lead possibly is transported associated to particles [20]. PC2 explains only 8% of the data variation and it is mainly associated to parameters related to dissolved organic matter (color and COD).…”

Section: Flowpaths and Relationships Between Sampling Pointsmentioning

confidence: 83%

Use of Multivariate Statistics in Order to Understand the Flow of Acid Rock Drainage from an Abandoned Mining Site

Bäckström¹,

Sartz²

2016

JEP

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Pathways for acid rock drainage from an abandoned mining site (sulphidic ore) were investigated by analysing ground, seepage and surface waters. It was found that in affected ground and seepage waters pH was lower (average pH 5.0); sulphate higher (average 350 mg/L) and trace element concentrations were significantly increased (4330 µg/L copper and 7700 µg/L zinc) compared to surrounding waters. Multivariate statistics (principal component analysis) were used on the data set. Obtained loading plot showed a clear negative correlation between pH and parameters found at high concentrations, indicating that these parameters are found at the source term (acid rock drainage). Lead was also found in close proximity to iron and turbidity indicating that lead might be associated with particles. The score plot presented almost all samples from high concentrations to low concentrations along the first principal component (explaining 63% of the variation in the data set) indicating that dilution was an important mechanism for the decrease in concentrations as opposed to immobilisation on surfaces along the flowpath. Decrease in fluoride and sulphate along one of the suspected flowpath coincided with an increase in calcium. Through geochemical calculations it was concluded that calcite (CaCO3) dissolved along the flowpath and thus induced precipitation of gypsum (CaSO4) and fluorite (CaF2). Through a combination of PCA and geochemical calculations the most likely flowpaths for contaminated water from the abandoned mining site were presented, making it possible to prevent further negative effects on the surface water.

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Section: Flowpaths and Relationships Between Sampling Pointsmentioning

confidence: 83%

Use of Multivariate Statistics in Order to Understand the Flow of Acid Rock Drainage from an Abandoned Mining Site

Bäckström¹,

Sartz²

2016

JEP

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“…In such river systems, both concentrations of suspended particulate matter and pollutant contents increase with the growing discharge, particularly in the early stage of floods. Their values sometimes remain high even during the flood attenuation (Müller and Wessels 1995 ; Baborowski et al 2004 ; Coynel et al 2007a , b ; Resongles et al 2015 ), producing a counter-clockwise hysteresis loop of total pollutant loads versus discharge (Zonta et al 2005 ; Coynel et al 2007a , b ). The loop documents the activation of pollutants and sediments as enhanced runoff and river discharge pass through their temporary sink.…”

Section: Flood Control On Heavy Metals’ Storage In a Channelmentioning

confidence: 99%

“…The loop documents the activation of pollutants and sediments as enhanced runoff and river discharge pass through their temporary sink. Higher discharges may also increase dissolved pollutant concentrations, e.g., in the case of As; by contrast, the dissolved concentrations of most other pollutants, i.e., those primarily transported in particulate forms, are decreased due to dilution by excess water (Baborowski et al 2004 ; Resongles et al 2015 ).…”

Section: Flood Control On Heavy Metals’ Storage In a Channelmentioning

confidence: 99%

“…Proportions of the actual mechanisms at play are usually not distinguishable. The existence of many pollutant pathways varies depending on individual pollutants, catchment characteristics and changes with precipitation intensity and flood-wave discharge (Zonta et al 2005 ; Coynel et al 2007a , b ; Resongles et al 2015 ; Nováková et al 2015 ).…”

Section: Flood-related Remobilization Of Heavy Metalsmentioning

confidence: 99%

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A Review of Flood-Related Storage and Remobilization of Heavy Metal Pollutants in River Systems

Ciszewski

Grygar

2016

Water Air Soil Pollut

157

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Recently observed rapid climate changes have focused the attention of researchers and river managers on the possible effects of increased flooding frequency on the mobilization and redistribution of historical pollutants within some river systems. This text summarizes regularities in the flood-related transport, channel-to-floodplain transfer, and storage and remobilization of heavy metals, which are the most persistent environmental pollutants in river systems. Metal-dispersal processes are essentially much more variable in alluvia than in soils of non-inundated areas due to the effects of flood-sediment sorting and the mixing of pollutants with grains of different origins in a catchment, resulting in changes of one to two orders of magnitude in metal content over distances of centimetres. Furthermore, metal remobilization can be more intensive in alluvia than in soils as a result of bank erosion, prolonged floodplain inundation associated with reducing conditions alternating with oxygen-driven processes of dry periods and frequent water-table fluctuations, which affect the distribution of metals at low-lying strata. Moreover, metal storage and remobilization are controlled by river channelization, but their influence depends on the period and extent of the engineering works. Generally, artificial structures such as groynes, dams or cut-off channels performed before pollution periods favour the entrapment of polluted sediments, whereas the floodplains of lined river channels that adjust to new, post-channelization hydraulic conditions become a permanent sink for fine polluted sediments, which accumulate solely during overbank flows. Metal mobilization in such floodplains takes place only by slow leaching, and their sediments, which accrete at a moderate rate, are the best archives of the catchment pollution with heavy metals.

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“…Significant variability in sediment‐associated contaminant transport during flood events has been reported in a range of catchment types (e.g., Coynel, Schäfer, Blanc, & Bossy, ; Leenaers, ; Resongles, Casiot, Freydier, Le Gall, & Elbaz‐Poulichet, ; Zonta, Collavini, Zaggia, & Zuliani, ). This includes varying concentrations across the flood hydrograph, where elevated concentrations are often dependent on discharge (Bradley & Lewin, ; Zonta et al, ), and contaminants may exhibit a “ first flush ” response (Lee, Bang, Ketchum, Choe, & Yu, ; Yin & Li, ).…”

Section: Introductionmentioning

confidence: 99%

Highly conservative behaviour of bed sediment‐associated metals following extreme flooding

Hurley

Woodward

Rothwell

2019

Hydrological Processes

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On December 26, 2015 (Boxing Day), an exceptional flood event occurred in the Irwell catchment, United Kingdom, when the neighbouring Mersey catchment experienced a much more typical winter run-off event. This provided an opportunity to examine the influence of high-magnitude hydrological processes on the behaviour of fine-grained metal-contaminated bed sediments. Forty sites across the two catchments were sampled for channel bed fine sediment storage and sediment-associated metal(loid) concentrations prior to, and following, the flooding. Sediments were analysed for total As, Cr, Cu, Pb, and Zn and then subjected to a five-step sequential extraction procedure. Despite a significant reorganisation of fine-grained (<63 μm) sediment storage, metal(loid) concentrations demonstrated markedly conservative behaviour with no significant difference observed between pre-flooding and postflooding values across both catchments. Estimates of the channel bed storage of sediment-associated metal(loid)s also showed minimal change as a result of the flooding. The metal partitioning data reveal only minor changes in the mobility of bed sediment-associated metal(loid)s, indicating that such flood events do not increase the availability of sorbed contaminants in these catchments. Post-flooding bed sediment metal(loid) loadings remain high, indicating persistent and long-lasting sources of contamination within the Irwell and upper Mersey fluvial network.

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Variation of dissolved and particulate metal(loid) (As, Cd, Pb, Sb, Tl, Zn) concentrations under varying discharge during a Mediterranean flood in a former mining watershed, the Gardon River (France)

Cited by 35 publications

References 55 publications

Use of Multivariate Statistics in Order to Understand the Flow of Acid Rock Drainage from an Abandoned Mining Site

Use of Multivariate Statistics in Order to Understand the Flow of Acid Rock Drainage from an Abandoned Mining Site

A Review of Flood-Related Storage and Remobilization of Heavy Metal Pollutants in River Systems

Highly conservative behaviour of bed sediment‐associated metals following extreme flooding

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