Unusual variations of dissolved As, Sb and Ni in the Rhône River during flood events

Ollivier, Patrick; Radakovitch, Olivier; Hamelin, Bruno

doi:10.1016/j.gexplo.2005.08.083

Cited by 22 publications

(17 citation statements)

References 10 publications

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“…Thus, our results are in broad agreement with previous studies of the Rhône subaqueous delta. Moreover, assuming a dry bulk density of 2.65 g cm − 3 , and a mean porosity of 80% (Lansard, 2004), the total sediment accumulation is on the order of 4 × 10 6 t. However, the suspended sediment load of the Rhône during the flood was estimated by Ollivier et al (2006) at around 3.1 × 10 6 t at Arles, 50 km upstream from the Rhône mouth. Concerning the same locality, Antonelli et al (in press) report a total solid discharge of 3.60 × 10 6 t of silt, 0.85 × 10 6 t of sand, and 0.83 × 10 6 t of clay, i.e.…”

Section: Solid Load Input During the Floodmentioning

confidence: 99%

Morphological changes and sedimentary processes induced by the December 2003 flood event at the present mouth of the Grand Rhône River (southern France)

et al. 2006

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The study, which is based on repetitive bathymetric surveys, assesses changes and effects of one of the most important floods recorded in the Rhône Delta area: bottom morphology and sediment distribution in the Rhône outlet after the December 2003 flood are discussed by comparison between Digital Terrain maps (DTMs) of November 2003 and January 2004.The post-flood morphology shows that the whole of the system is active, mainly in the east. The channel of the Rhône has been hollowed out on the left bank by more than 5 m, the eastern coast of the mouth has retreated 400 m, the mouth-bar has prograded 200 m and the slope of the delta front has increased by 0.19°. The overlay of pre-and post-flood DTMs makes it possible to estimate the total volume deposited in the [0 to −20 m] zone as +7.8 × 10 6 m 3 (i.e. 0.88 m 3 m − 2 ), which corresponds to 4 × 10 6 t of sediment. These values are compared with the average annual volume of 0.47 × 10 6 m 3 yr − 1 of sediment deposited in this zone between 1995 and 2003, as well as the average sediment load estimated at the Arles station (50 km upstream) for this flood event (3.1 × 10 6 t to 5.3 × 10 6 t).The acquisition of bathymetric measurements immediately before and after a major flood allows more than a simple morphological description; in addition, an analysis of the solid load transfer processes towards the prodelta is achievable. Three mechanisms are highlighted. Most of the material eroded in the channel and supplied to the delta front corresponds to fine sediment that drape homogeneously over the pre-flood morphology of the delta front. The transit of the coarsest sediment (primarily sand) is slowed down in the channel of the Rhône: this sediment builds up in relatively small areas, leading to the formation of gullies on the prodelta slope. The gullies have fixed positions and disappear gradually towards the west, following the progressive migration of the active band towards the east. These old features are not reactivated by floods occurring after their formation. During the flood, only a small volume of coarse sediment bypasses through the gullies, and the fine deposits are remobilised rapidly or compacted. Flood input concerns essentially the delta front, which traps 90% of the fluvial solid discharge between 0 and 20 m depth. The coarse prodelta supply is then due mainly to mass movements of unconsolidated material deposited beforehand on the top of the delta front. Consequently, the main nourishment of the prodelta does not occur directly during and/or immediately after a flood event, but is delayed by sediment being temporarily trapped on the delta front.

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Section: Solid Load Input During the Floodmentioning

confidence: 99%

Morphological changes and sedimentary processes induced by the December 2003 flood event at the present mouth of the Grand Rhône River (southern France)

et al. 2006

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“…Moreover, due to global climate change, the recession rate has been enhanced and snowfall has increased coupled with frequently occurred snowstorms, which may alter many aspects of hydrology during this period, such as flooding, erosion, hydrochemical and output (Stepanauskas et al, 2000;Ollivier et al, 2006;Vilímek et al, 2015), likewise the Songhua River Basin (Wang and He, 2013). During the winter season from 2012 to 2013, Northeastern China suffered from intensive and frequent snowfall, the precipitation reached 78 mm in the upper stream of Songhua River Basin (the Second Songhua River), and over 70 mm in the basin of mainstream, which was approximately 110% more than the annual average snowfall.…”

Section: Introductionmentioning

confidence: 99%

Variations of total dissolved iron and its impacts during an extreme spring flooding event in the Songhua River

Guan

Yan

Yuan

2016

Journal of Geochemical Exploration

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“…The geochemical signature of the Gardon River, characterized by relatively high dissolved As and Sb concentrations, was evidenced during three important flood events recorded on the Rhône River in 2002 and 2003 (Ollivier et al, 2006). During these floods, dissolved As (1-5 μg/L) and Sb (0.2-0.7 μg/L) concentrations in the Rhône River at Arles, downstream from the junction with the Gardon River, were close to those recorded in the present study (3-7 μg/L for As and 0.3-0.9 μg/L for Sb) during the floods at Ners; this was related to the unusual contribution of Cevenol tributaries to the whole Rhône flow during the 2002 and 2003 flood events.…”

Section: Discussionmentioning

confidence: 99%

“…During these floods, dissolved As (1-5 μg/L) and Sb (0.2-0.7 μg/L) concentrations in the Rhône River at Arles, downstream from the junction with the Gardon River, were close to those recorded in the present study (3-7 μg/L for As and 0.3-0.9 μg/L for Sb) during the floods at Ners; this was related to the unusual contribution of Cevenol tributaries to the whole Rhône flow during the 2002 and 2003 flood events. In particular, Cevenol tributaries accounted for 90% of the Rhône flow at Arles during the September 2002 flood event (Ollivier et al, 2006(Ollivier et al, , 2011.…”

Section: Discussionmentioning

confidence: 99%

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

Casiot

Freydier

et al. 2015

Journal of Geochemical Exploration

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The variation of dissolved and particulate metal(loid) concentrations was investigated during a Mediterranean flood in a former mining watershed, the Gardon River (SE France), using high-temporal resolution sampling. Dissolved antimony originating from the Upper Gardon River watershed underwent dilution during flood. Conversely, dissolved As and particulate As, Pb, Zn, Cd and Tl concentrations exhibited increased values during rising flood compared to low and receding flow conditions, with a double-peak shape. As, Pb, Cd and Tl concentration data in suspended particulate matter from this double-peak were distributed along two different correlation lines, showing the successive mobilization of two groups of particles highly enriched with As and Cd or Pb and Tl, both inherited from ancient Pb/Zn mines. Metal(loid) loads during the monitored 24 h-flood event were: 0.5 kg for Cd, 19.4 kg for Sb and 204 kg for As in the dissolved phase and 24 kg for Cd, 38 kg for Tl, 94 kg for Sb, 1915 kg for As, 2860 kg for Pb and 5214 kg for Zn in the particulate phase. Altogether, these results highlighted the importance of floods in the mobilization of metals and metalloids from ancient mining sites in Mediterranean regions, showing the need for high-temporal resolution monitoring of flood events to accurately assess the long-term contribution of mining activity to metal(loid) loads of downstream watershed.Please cite this article as: Resongles, E., et al., Variation of dissolved and particulate metal(loid) (As, Cd, Pb, Sb, Tl, Zn) concentrations under varying discharge during a Medite.

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Unusual variations of dissolved As, Sb and Ni in the Rhône River during flood events

Cited by 22 publications

References 10 publications

Morphological changes and sedimentary processes induced by the December 2003 flood event at the present mouth of the Grand Rhône River (southern France)

Morphological changes and sedimentary processes induced by the December 2003 flood event at the present mouth of the Grand Rhône River (southern France)

Variations of total dissolved iron and its impacts during an extreme spring flooding event in the Songhua River

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)

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