Author(s): Markus Noack, Gerhard Schmid, Aline Schaefer Rodrigues Silva, Silke Wieprecht
Linked Author(s): Markus Noack
Keywords: Cohesive sediments, critical shear stresses, erosion rates, photogrammetry
Abstract: Knowledge about critical shear stress and erosion rates of cohesive sediments are fundamental to establish a sustainable sediment management in rivers worldwide. However, compared to non-cohesive sediments the incipient motion of cohesive sediments is more complex given the large number of interacting physical, chemical and biological parameters. This article describes a novel method to measure erosion rates in laboratory flumes using photogrammetric methods in a high spatio-temporal resolution. In addition, a Vectrino profiler is applied to account for changes in Reynolds shear stresses given the changing roughness of the sediment surfaces. The results show that the photogrammetric method allows for the detection of minimal erosion volumes of <10 mm� on a surface of 8000 mm�, while the Vectrino profiler proved to be a suitable device considering the influence of roughness on bed shear stresses
Year: 2017