Author(s): Ingo Schnauder; Tina Nan Aien; Silke Wieprecht
Linked Author(s): Silke Wieprecht, Ingo Schnauder
Keywords: Wake flow sediment transport retention transient storage flume experiments
Abstract: Vegetation, large wood or boulders are typical flow obstructions in rivers and associated with the formation of wake flows. They provide local flow and substrate diversity, turbulence and mixing, but also transient storage and retention of fine sediments and other particulate matter. Transferring these processes to the flume scale is challenging due to the given limitations with scaling sediment sizes and cohesiveness. As an alternative, substitute plastic particles of larger diameter (2 mm) but lower density (1060 kg/m3) than natural sediments were tested in the present study. The transient deposition patterns captured with a downward-looking camera clearly reflect the differences in wake flow characteristics for the tested configurations, in particular between submerged and emerged cylinders. However, upscaling of sediment retention volumes and retention rates to the prototype scale is not straightforward and requires further efforts.
Year: 2025