Author(s): Siedersleben Jakob; Schuster Marco; Achleitner Stefan; Aufleger Markus
Linked Author(s): Markus Aufleger
Keywords: No Keywords
Abstract: Physical modelling of bed load transport is a challenging task due to a number of factors. A key issue is the correct sediment scaling without oversimplifying the essential sediment behavior of the prototype scale. Due to laboratory space and funding restrictions, correct sediment scaling is often not possible and the Shields diagram may reveal, that some proportions of bed load are not transported in the rough transport regime. In addition, limiting the minimum particle diameter is a common way to avoid cohesive effects and transport bodies in physical model experiments. This work evaluates the effects of modifying the particle size distribution (PSD) using the numerical model Telemac2d coupled with the sediment transport model Gaia. The numerical simulations refer to physical experiments which were carried out on a 1:25 scale model to investigate sediment management at the Reutte weir facility on the alpine Lech River in Austria. The results of the numerical simulations show that changing the particle size distribution has an effect on erosion and deposition magnitude, timescales and transport rates. However, the deposition and erosion patterns are still reproduced within an acceptable accuracy.
Year: 2024