Using cosmogenic beryllium–7 as a tracer in sediment budget investigations
Using cosmogenic beryllium–7 as a tracer in sediment budget investigations
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DOI：
10.1111/1468-0459.00163
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发表时间：
2002-08
期刊：
影响因子：
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通讯作者：
William H. Blake;D. Walling;Q. He
中科院分区：
文献类型：
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作者：
William H. Blake;D. Walling;Q. He
最近在使用环境放射性核素铯- 137和不支持铅- 210量化中长期侵蚀和沉积物积聚速率方面取得的进展已证明在流域沉积物预算调查中具有相当大的价值。然而，仍有必要探索使用其他寿命较短的放射性核素的可能性，以提供沉积物在较短时间尺度上动员、运输和储存的证据，特别是针对个别事件。这篇文章报告了一项研究的结果，该研究旨在探索使用铍- 7 （7Be, t½= 53.3天）来满足这一要求的可能性。该研究调查了7Be作为沉积物示踪剂在沉积物收支的三个关键组成部分中的使用情况，即斜坡的土壤侵蚀和沉积物动员，河道中细沉积物的运输、储存和再动员以及河漫滩上的河岸沉积。所提出的结果清楚地表明，利用7Be获得关于短期和基于事件的沉积物再分配率的信息，用于流域沉积物预算调查的潜力。
Recent advances in the use of the environmental radionuclides caesium–137 and unsupported lead–210 to quantify medium– and longer–term rates of erosion and sediment accumulation have proved of considerable value in catchment sediment budget investigations. However, there remains a need to explore the potential for using other shorter–lived radionuclides to provide evidence of sediment mobilisation, transport and storage over shorter timescales and particularly for individual events. This contribution reports the results of a study aimed at exploring the potential for using beryllium–7 (7Be, t½= 53.3 days) to meet this requirement. The study investigated the use of 7Be as a sediment tracer in three key components of the sediment budget, namely, soil erosion and sediment mobilisation from slopes, the transport, storage and remobilisation of fine sediment in river channels and overbank deposition on river floodplains. The results presented clearly demonstrate the potential for using 7Be to obtain information on short–term and event–based sediment redistribution rates for use in catchment sediment budget investigations.