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- W2046265188 abstract "Abstract Total sediment accumulation rates (g/yr) in four canyons indenting the Washington continental shelf are about twice those on the nearby open slope, even though canyons comprise less than 40% of the depositional area of the entire slope. This is because 210 Pb-derived sediment accumulation rates (g/cm 2 /yr) for Astoria and Quinault Canyons are 3–4 times greater than those for Willapa and Grays Canyons and intermediate open slope areas, supporting the hypothesis that Columbia River-derived solids are preferentially transported to these two canyons. Quinault Canyon currently appears to be accumulating solids at rates much greater than its low, long-term accumulation rate, which is attributed to turbidity currents transporting solids down this canyon roughly every 500 years. The following four different approaches all show that mixing may cause 210 Pb-derived sediment accumulation rates for slope and canyon sediments to be 2–3 times higher than true accumulation rates: (1) comparison between accumulation rates calculated from 210 Pb profiles with and without surface zones in which mixing has obviously affected 210 Pb distributions; (2) comparison between 210 Pb-derived and independently determined, long-term accumulation rates; (3) comparison between 210 Pb-derived accumulation and modern Columbia River discharge rates; (4) comparison between two and three layer, steady-state, one dimensional diffusion-advection-decay models. Mixing coefficients for surface sediments calculated using a one dimensional, two layer, vertical eddy diffusion model show large differences within the region, with most in the 3–30 cm 2 /yr range. Mixing rates are several times larger in canyon sediments from 0.2–1.1 km water depth, probably due to physical reworking processes. Erroneously neglected mixing at depth of no more than 5% of that calculated for the surface mixed layer can cause the 2–3 fold calculated overestimation of true sediment accumulation rates, and 2–4 fold calculated underestimation of true mixing coefficients." @default.
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- W2046265188 date "1982-07-01" @default.
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- W2046265188 title "210Pb-derived sediment accumulation and mixing rates for the Washington continental slope" @default.
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- W2046265188 doi "https://doi.org/10.1016/0025-3227(82)90133-5" @default.
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