High Sediment Concentrations Require High In-Channel/Supply of Sedimentby Thomas E. Lisle, USDA Forest Service, Arcata, CA, USA,
Abstract: Flows with high sediment concentrations (greater than 10 percent by weight) most commonly occur either as debris flows in steep channels throughout the world, or as hyperconcentrated flows in alluvial channels in dry climates with local, intense rainfall. Debris flows often originate in colluvium-filled bedrock hollows that gradually fill with debris and then suddenly flush. Hyperconcentrations in desert alluvial channels can be achieved only by flowing some distance over channels that have accumulated fine sediment, because hillslope runoff produces concentrations no greater than about 10 percent.
Subject Headings: Channel flow | Sediment | Solids flow | Alluvial channels | Debris | Water flow | Streamflow | Climates
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