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• W4285093485 abstract "Abstract Sediment transport models, utilized to guide land management in the Great Barrier Reef (GBR), assume settling velocities for individual silt and clay particles on the order of 0.01 mm/s; however, silts and clays once flocculated exhibit settling velocities on the order of 1 mm/s. In this study, in‐situ ( n = 144,912) and laboratory‐dispersed ( n = 64) particle size measurements collected using laser diffractometry were compared from nine rivers discharging along 800 km of GBR coastline to determine the extent of in‐situ flocculation. Environmental controls on in‐situ particle size were investigated using decision tree algorithms trained on coeval measurements of salinity, shear rate, and turbidity. Comparison of in‐situ and dispersed particle size measurements demonstrate that suspended‐sediment across all catchments flocculated into larger aggregates with an order‐of‐magnitude difference in median particle size between in‐situ ( D 50v = 132 μm, σ = 60 μm for all data) and dispersed ( D 50v = 15 μm, σ = 11 μm for all data) particles. Machine learning algorithms showed excellent promise predicting various measures of in‐situ particle size. Model validation R 2 ranged from 0.72 to 0.99, inclusion of catchment as a categorical variable only marginally (<1%) increased R 2 . These results demonstrate that flocculation is prevalent across all rivers surveyed and that hydrodynamics are more important than inter‐catchment differences (e.g., differences in climate, geology, or land‐use). Implications of widespread flocculation on the determination of end‐of‐catchment sediments loads and subsequent dispersal patterns across continental shelves are discussed to inform the refinement and monitoring of GBR sediment targets." @default.
• W4285093485 created "2022-07-14" @default.
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• W4285093485 date "2022-07-01" @default.
• W4285093485 modified "2023-10-18" @default.
• W4285093485 title "Flocculation of Riverine Sediment Draining to the Great Barrier Reef, Implications for Monitoring and Modeling of Sediment Dispersal Across Continental Shelves" @default.
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• W4285093485 doi "https://doi.org/10.1029/2021jc017988" @default.
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