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- W1982158052 abstract "The fine sediment fraction, usually <63 μm, is generally regarded as significant for water quality issues. This fraction is usually presumed to be evenly distributed in the vertical column. Using period of record data for three prairie rivers and three cordilleran river sites, and midstream data from the Mackenzie River, we examine the degree to which near-surface samples of silt and clay are representative of the vertical and cross section. These data are available only for high flow conditions. Surface samples of silt + clay tend to underestimate the vertical mean concentration by less than 10%; also, 89% of the surface data at five of the six sampled sites are within ±15% of the vertical mean concentration. The individual vertical distributions of clay and silt display inconsistent and variable patterns of concentration with depth and can include large excursions within individual profiles. Our data do not indicate that large, deep rivers behave differently from shallow ones. There is no evidence of increasing homogenization of silt + clay across the section as discharge increases. The data indicate typical errors that may be expected if surface samples are used to characterize the water column at high discharges. A theoretical basis for the observations is provided together with a discussion of assumptions which render theory imprecise for fine-grained cohesive sediment." @default.
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- W1982158052 date "1990-03-01" @default.
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- W1982158052 title "Vertical and lateral distribution of fine-grained particulates in prairie and cordilleran rivers: Sampling implications for water quality programs" @default.
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- W1982158052 doi "https://doi.org/10.1016/0043-1354(90)90005-q" @default.
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