Parametric Analysis of Two-Layer Shallow Flow Modelling for Landslide and Water Waves in Dam Reservoirs

Aksen, Mustafa Meriç
Landslides into dam reservoirs can create large water waves which may cause overtopping of the dam body or even dam breaking in extreme cases. Numerical simulations of water surface deformation in the complete dam reservoir after the impact of sliding mass is necessary to predict potential risks of landslide generated waves. Depth integrated shallow flow equations may be useful to model the generation and propagation of water waves in the reservoir after landslides. Coulomb model for the slide material is combined to 1D shallow flow equations to form a two-layer model for the slide material and water in the reservoir. Finite volume method is used in numerical solution of the model equations. Weighted average flux method is employed to calculate fluxes based on an approximate Riemann solver. First-order well-balanced discretization scheme is implemented as a cure for numerical fluctuations due to rapid bed elevation changes. Several landslide geometries are studied to investigate the energy transfer rate from the sliding material to water in the reservoir and the maximum wave rise in the domain. It is observed that a general formulation between slide characteristics and waves is not feasible due to case dependent relations between the variables.


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Citation Formats
M. M. Aksen, “Parametric Analysis of Two-Layer Shallow Flow Modelling for Landslide and Water Waves in Dam Reservoirs,” M.S. - Master of Science, Middle East Technical University, 2022.