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Institut für Wasserbau - IWS

Selected Topics and International Network Lectures

16:00 Uhr
Maarten Felix, Universität Stuttgart, Institut für Wasserbau, Lehrstuhl für Hydromechanik und Hydrosystemmodellierung

Dilution of sediment gravity currents, or: the generation of turbidity currents from debris flows

Abstract: Sediment gravity currents are a subclass of density currents, which are currents driven by the density difference with the ambient fluid. In sediment gravity currents this density difference is caused by sediment. Such flows occur in many different environments, both subaerially and subaqueously, but the flows considered in this talk will be subaqeous only. Sediment concentration in sediment gravity flows can range from dense (debris flows with 60-70 % volumetric concentration of sediment) to dilute (turbidity currents with less that 1 % sediment). Several mechanisms have been suggested to explain how dense flows can transform into dilute flows, but none appear to be entirely satisfactory. In this talk, results will be presented from laboratory experiments, numerical simulations and from field work, aimed at gaining a better understanding of dilution/transformation processes.