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- W2148107993 abstract "A comprehensive model for the activity of radionuclides in sediments is presented. The model is based on the advection‐diffusion equations for sediment solids and a radioactive tracer. Mixing, caused by deposit feeders, is taken into account by a half‐Gaussian (HG), integrated Gaussian (IG), or exponential (EX) diffusion coefficient with a maximum value D 0 at the sediment‐water interface and an effective mixing depth m , where m = σ(HG), z m (IG), or a (EX). Compaction is described by an exponential bulk sediment density. The differential equations are solved by finite differences, in particular, the Crank‐Nicolson method for the time‐dependent case (Cs‐137). Estimation of the mixing parameters D 0 and m is carried out efficiently by minimizing chi‐square for measured and calculated steady state Pb‐210 activities. The derived mixing depths of z m = 4.6 ± 0.1 cm (station 14) and a = 0.8 ± 0.1 cm (station 18) for the cores from Lake Huron are in good agreement with the organism distributions. The corresponding D 0 values are 12 ± 2 and 1.5 ± 0.5 cm 2 /yr, respectively, where the latter number is lower than a previous lower limit estimate (≥ 3.3 cm 2 /yr), based on 1974 data. These diffusion coefficients are in excellent agreement with those inferred from the densities of Pontoporeia and tubificid oligochaetes (9.3 and 1.6 cm 2 /yr, respectively). Compared with southern Lake Michigan, there appears to be less sediment focusing in northern Lake Michigan, where the ratios of measured to atmospheric Cs‐137 inventories have an average value of 0.89 and range from 0.32 to 1.41 for six cores from the deep basin. When these ratios are used to correct the Pb‐210 fluxes, we obtain an atmospheric Pb‐210 flux of 0.99 ± 0.06 dpm/cm 2 /yr. Because of its more realistic activity profiles, we consider the present model to be generally better than previous models." @default.
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- W2148107993 date "1986-07-15" @default.
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- W2148107993 title "Modeling radiotracers in sediments: Comparison with observations in Lakes Huron and Michigan" @default.
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- W2148107993 doi "https://doi.org/10.1029/jc091ic07p08559" @default.
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