Use of Fallout Pb-210 Measurements to Investigate Longer-Term Rates and Patterns of Overbank Sediment Deposition on the Floodplains of Lowland Rivers
Use of Fallout Pb-210 Measurements to Investigate Longer-Term Rates and Patterns of Overbank Sediment Deposition on the Floodplains of Lowland Rivers
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DOI：
10.1002/(sici)1096-9837(199602)21:2
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发表时间：
1996-02
影响因子：
3.3
通讯作者：
Q. He;D. Walling
中科院分区：
文献类型：
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作者：
Q. He;D. Walling
探讨了使用降尘(无支持的)铅-210(210Pb)测量来估计低地河流泛滥平原岸上泥沙淤积速率的可能性。建立了一个区分直接大气降尘的贡献和与悬浮泥沙沉积相关的集水区输入的模型，以解释滩地采样点的大气降铅-210清单，并估计过去100年的平均泥沙累积速率。该方法已成功地用于估计英国德文郡库尔姆河和EXE河泛滥平原上的漫滩沉积速率。对库尔姆河泛滥平原小范围内的长期沉积速率模式的详细调查表明，沉积速率的范围在0.07到0.59g cm−2a−1之间，这与使用沉积圈闭获得的当前沉积速率的估计值非常一致。
The potential for using fallout (unsupported) Pb-210 (210Pb) measurements to estimate rates of overbank sediment deposition on the floodplains of lowland rivers is explored. A model which distinguishes the contribution from direct atmospheric fallout and the catchment-derived input associated with the deposition of suspended sediment has been developed to interpret the fallout Pb-210 inventories at floodplain sampling sites and to estimate average sediment accumulation rates over the past 100 years. The approach has been successfully used to estimate rates of overbank sedimentation on the floodplains of the Rivers Culm and Exe in Devon, U.K. A detailed investigation of the pattern of longer-term sedimentation rates within a small reach of the floodplain of the River Culm indicated a range of deposition rates between 0.07 and 0.59 g cm−2 a−1, which was in close agreement with estimates of current sedimentation rates obtained using sedimentation traps.