Depositional environments and historical contamination as a framework to reconstruct fluvial sedimentary evolution

Vauclin, Sophia; Mourier, Brice; Dendievel, André‐Marie; Noclin, Nicolas; Piégay, Hervé; Marchand, Philippe; Vénisseau, Anaïs; Vismes, A. de; Lefevre, Irène; Winiarski, Thierry

doi:10.1016/j.scitotenv.2020.142900

Cited by 16 publications

(18 citation statements)

References 66 publications

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“…It is a run-of-river dam, implying that it can be removed during floods to allow high discharges. However, a small recess zone on the right bank has allowed continuous accumulation of sediment since the construction of the dam, as proved by bathymetric surveys of the reservoir over time (Vauclin et al, 2020). To decipher the variations in temporal concentrations, the results from this area are sitespecific.…”

Section: Sampling Sitesmentioning

confidence: 99%

“…Characteristics of all the cores, except PBN-2002, have already been published in other papers, although the data on BFR contamination from these cores are mostly original. Furthermore, data on MTE and TRS were published by Morereau et al (2020), and those for PDR-1802, PDR-1806, and PDR-1902 were published by Vauclin et al (2020).…”

Section: Sediment Cores Sampling and General Characterisationmentioning

confidence: 99%

Section: Sediment Core Datingmentioning

confidence: 99%

“…The age-depth models of MTE and TRS cores have been published by Morereau et al (2020) and Dendievel et al (2020). Furthermore, the age-depth models of cores PDR-1802, PDR-1806, and PDR-1902 were published by Vauclin et al (2020). The model for core PBN-2002 is original but based on the multi-proxy methodology developed by Vauclin et al (2020).…”

Section: Sediment Core Datingmentioning

confidence: 99%

“…Numerous sediment records have been successfully used to reconstruct the temporal trends of PCBs. Moreover, various studies have shown that their worldwide prohibition in the 1980s led to a significant decrease in their environmental concentrations (Chi et al, 2007;Desmet et al, 2012;Bigus et al, 2014Cui et al, 2016Dendievel et al, 2020). However, their stocks might continue to persist in sediments and could pose a risk of intermittent contaminant releases in hydrosystems.…”

Section: Introductionmentioning

confidence: 99%

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Temporal trends of legacy and novel brominated flame retardants in sediments along the Rhône River corridor in France

et al. 2021

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Brominated flame retardants (BFRs) are anthropogenic compounds that are ubiquitous in most 6 manufactured goods. Few legacy BFRs have been recognised as persistent organic pollutants (POPs) 7 and have been prohibited since the 2000s. However, most BFRs continue to be used despite growing 8 concerns regarding their toxicity; they are often referred to as novel BFRs (nBFRs). While 9 environmental contamination due to chlorinated POPs has been extensively investigated, the levels and spatiotemporal trends of BFRs are comparatively understudied. This study aims to reconstruct the temporal trends of both legacy and novel BFRs at the scale of a river corridor. To this end, sediment cores were sampled from backwater areas in four reaches along the Rhône River. Age-depth models were established for each of them. Polychlorinated biphenyls (PCBs), legacy BFRs (polybrominated diphenyl ethers -PBDEs, polybrominated biphenyls -PBBs and hexabromocyclododecane -HBCDDs) and seven nBFRs were quantified. Starting from the 1970s, a decreasing contamination trend was observed for PCBs. Temporal trends for legacy BFRs revealed that they reached peak concentrations from the mid-1970s to the mid-2000s, and stable concentrations by the mid-2010s. Additionally, individual concentrations of nBFRs were two to four orders of magnitude lower than those of legacy BFRs. Their temporal trends revealed that they appeared in the environment in the 1970s and 1980s. The concentrations of most of these nBFRs have not decreased in recent years. Thus, there is a need to comprehend the sources, contamination load, repartition in the environment, and toxicity of nBFRs before their concentrations reach hazardous levels.

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Section: Sampling Sitesmentioning

confidence: 99%

Section: Sediment Cores Sampling and General Characterisationmentioning

confidence: 99%

Section: Sediment Core Datingmentioning

confidence: 99%

Section: Sediment Core Datingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temporal trends of legacy and novel brominated flame retardants in sediments along the Rhône River corridor in France

et al. 2021

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Determination and quantification of sedimentary processes in salt marshes using end‐member modelling of grain‐size data

Lenz

Lindhorst

Arz

2022

The Depositional Record

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End-member modelling of bulk grain-size distributions allows the unravelling of natural and anthropogenic depositional processes in salt marshes and quantification of their respective contribution to marsh accretion. The sedimentology of two marshes is presented: (1) a sheltered back-barrier marsh; and (2) an exposed, reinstated foreland marsh. Sedimentological data are supplemented by an age model based on lead-210 decay and caesium-137, as well as geochemical data. End-member modelling of grain-size data shows that marsh growth in back-barrier settings is primarily controlled by the settling of fines from suspension during marsh inundation. In addition, nearby active dunes deliver aeolian sediment (up to 77% of the total sediment accretion), potentially enhancing the capability of salt marshes to adapt to sea-level rise. Growth of exposed marshes, by contrast, primarily results from high-energy inundation and is attributed to two sediment-transport processes. On the seaward edge of the marsh, sedimentation is dominated by coarser-grained traction load, whereas further inland, settling of fine-grained suspension load prevails. In addition, a third, coarse-grained sediment sub-population is interpreted to derive from anthropogenic landreclamation measures, that is material from drainage channels relocated onto the marsh surface. This process contributed up to 34% to the total marsh accretion and terminated synchronously with the end of land reclamation measures. Data suggest that natural sediment supply to marshes alone is sufficient to outpace contemporary sea-level rise in the study area. This underlines the resilience potential of salt marshes in times of rising sea levels. The comparison of grain-size sub-populations with observed climate variability implies that even managed marshes allow for the extraction of environmental signals if natural and anthropogenic sedimentary processes are determined and their relative contribution to bulk sediment composition is quantified. Data series based solely on bulk sediments, however, seem to be of limited use because it is difficult to exclude bias of natural signals by anthropogenic measures.

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The Potential to Reconstruct 20th Century Soil Organic Carbon Erosion in Rangelands From Small Reservoir Sediments

Li,

Krenz,

Pregler

et al. 2024

Land Degrad Dev

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Soil erosion and soil organic carbon (SOC) loss are not always linked linearly because SOC‐rich topsoil is eroded at the initial stages of degradation, while horizons with lower SOC content are eroded later, but often at higher rates. Small, silted‐up farm reservoirs potentially document this change during the period of sediment accumulation. This study tests the specific potential of small farm reservoir sediments from the South African Karoo to reconstruct 20th century SOC and total nitrogen (TN) change in rangeland soils. Five reservoir sediment profiles were sampled and texture, total organic carbon (TOC), TN and 137Cs of the samples were analyzed and compared. The results show that there clearly distinguishable flood couplets have been preserved in the sediment, illustrating their suitability for the chronological reconstruction of soil erosion and SOC. With one exception, the older sediments contain more TOC and TN than the younger ones. The TOC changed mostly in earlier than later stages of deposition, which is indicative of soil degradation early after the construction of the dams in the 1920s and 1930s. These distinct changes illustrate that the small reservoir sediments have the potential to reconstruct the impact of land‐use and associated soil erosion on SOC change in rangelands. Their analysis can therefore contribute to a better understanding of the land‐use associated changes of the global carbon cycle during the 20th century.

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Depositional environments and historical contamination as a framework to reconstruct fluvial sedimentary evolution

Cited by 16 publications

References 66 publications

Temporal trends of legacy and novel brominated flame retardants in sediments along the Rhône River corridor in France

Temporal trends of legacy and novel brominated flame retardants in sediments along the Rhône River corridor in France

Determination and quantification of sedimentary processes in salt marshes using end‐member modelling of grain‐size data

The Potential to Reconstruct 20th Century Soil Organic Carbon Erosion in Rangelands From Small Reservoir Sediments

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