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- W2012607593 abstract "Freeze- and grab-sampling techniques for the collection of bulk sub-surface sediments in gravelly rivers are compared. Data obtained from sampling a substratum of known composition and at over 300 field locations, indicate that grab-sampling underestimates the proportion, by weight, of the fine sediment component but collects representative samples of the coarser gravel component. As a consequence of this sampling bias, the textural characteristics of the composite grab-sample means were significantly different (p < 0.01) from the population means. Grab-samples were coarser, better sorted, had a stronger negative skew and were more leptokurtic by comparison. In contrast, freeze-sampling was shown to be a more accurate and precise technique for collecting bulk sub-surface sediments. One third the number of freeze-samples is required at-a-site in order to obtain representative estimates of all the true textural characteristics of the sediment. All sample estimates were within 10% of population mean values." @default.
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- W2012607593 date "1992-07-01" @default.
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- W2012607593 title "A comparison of grab- and freeze-sampling techniques in the collection of gravel-bed river sediment" @default.
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- W2012607593 doi "https://doi.org/10.1016/0037-0738(92)90019-n" @default.
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