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Flood Transport and Deposition of Tracer Heavy Minerals in a Gravel-Bed Meander Bend Channel
Johan Hattingh (1), Izak C. Rust (2)
Heavy-mineral transport and deposition in a gravel-bed river was studied by placing 40,000 kg of heavy minerals at the upstream end of a meander-bend channel prior to a flood. During a subsequent flood, redeposition of the tracer heavy minerals was limited to the meander-bend part of the channel. High concentrations of heavy minerals formed on the point-bar face and in particular downstream of the point-bar apex. Zones of flow separation in the lee of boulders and cobbles are favorable sites for heavy-mineral concentration. Low heavy-mineral concentrations were formed in the thalweg and on the outer bank of the meander bend despite high bed roughness there. At the downstream end of the meander bend a swamp effectively filtered out heavy minerals from suspension.
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