Variability of fallout radionuclides (FRNs) in river channels: implications for sediment tracing

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Enrique Muñoz-Arcos, Geoffrey E. Millward, Caroline C. Clason, Richard Hartley, Claudio Bravo-Linares, William H. Blake
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引用次数: 0

Abstract

Purpose

The aims of this research were to assess the sources of variability of particulate FRNs (7Be, 210Pbex and 137Cs) in river channels, the influence of sediment properties such as particle size distribution (PSD) and organic matter (OM) on FRN distributions, and to discuss the implications for sediment tracing in rivers.

Methods

Suspended and channel bed sediment samples were collected in the River Avon (Devon, UK) during five strategic surveys involving a wide variation of river flows, including flood conditions. Particulate matter was analysed for 7Be, 210Pbex and 137Cs by gamma spectrometry, PSD by laser diffraction, and organic constituents, total organic carbon (TOC) and total nitrogen (TN) by elemental analysis.

Results

FRNs activity concentrations vary significantly both spatially, characterised by changes in activity concentrations within and between locations, and temporally, with changes during the storm hydrograph and between seasons. Variability was attributed to changes in sediment sources and, on some occasions, to significant correlation of activity concentrations with sediment properties. The results also highlighted the influence of changes in channel characteristics and the magnitude and frequency of floods on FRN distributions.

Conclusion

In the context of sediment tracing, attention should be given to seasonal changes in riverine conditions that have the potential to affect 7Be and 137Cs conservativeness. Application of FRNs in sediment fingerprinting studies should be accompanied by appropriate temporal characterisation of potential sediment sources. Finally, potential contribution of 7Be-depleted sediment from channel resuspension to the suspended load should also be considered.

Abstract Image

河道中沉降放射性核素(FRNs)的变化:对沉积物追踪的影响
本研究旨在评估河道中颗粒 FRNs(7Be、210Pbex 和 137Cs)的变化来源、沉积物特性(如粒度分布 (PSD) 和有机物 (OM) )对 FRN 分布的影响,并讨论其对河流沉积物追踪的意义。通过伽马能谱仪分析了颗粒物质中的 7Be、210Pbex 和 137Cs,通过激光衍射分析了 PSD,通过元素分析分析了有机成分、总有机碳 (TOC) 和总氮 (TN)。这种变化可归因于沉积物来源的变化,在某些情况下,还可归因于活性浓度与沉积物特性之间的显著相关性。结果还强调了河道特征的变化以及洪水的规模和频率对 FRN 分布的影响。在沉积物指纹研究中应用 FRNs 的同时,还应对潜在的沉积物来源进行适当的时间特征描述。最后,还应考虑河道再悬浮对悬浮负荷可能造成的 7Be 贫化沉积物的影响。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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