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

2022-1-31
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.

Suggestions

Numerical modeling of dam breach in concrete gravity dams
mosaddeghi, farshid; Köken, Mete; Aydın, İsmail; Department of Civil Engineering (2021-9-08)
When a dam fails, a large amount of water is suddenly released that may create large flood waves capable of causing devastating impacts to downstream areas. This is even more important when the damage is caused by an earthquake, as it is unpredictable. The main objective of the research is a detailed simulating of the water surface profile from the first crack to the entire breaking of dams' body during earthquake using Finite Volume Method (FVM). The next objective is detecting of vulnerable zones on the d...
Probabilistic seismic hazard assessment for earthquake induced landslides
Balal, Onur; Gülerce, Zeynep; Department of Civil Engineering (2013)
Earthquake-induced slope instability is one of the major sources of earthquake hazards in near fault regions. Simplified tools, such as Newmark’s Sliding Block (NSB) Analysis are widely used to represent the stability of a slope under earthquake shaking. The outcome of this analogy is the slope displacement where larger displacement values indicate higher seismic slope instability risk. Recent studies in the literature propose empirical models between the slope displacement and single or multiple ground mot...
Seismic Performance Evaluation of Concrete Gravity Dams by Using Pseudo Dynamic Testing and Simulations
Aldemir, Alper; Binici, Barış (null; 2017-11-24)
Dams are one of the mostimportantinfrastructure components servingfor water storage and energyproduction.Experimental studies on the seismic response of concrete gravity dams are scarce due to the complications regarding thelargescaleof dams and their interaction with the reservoir. This study presents the results of recent novel pseudo-dynamic dam tests (PSD) along with the nonlinear finite element simulations of the specimens. The test specimens were 1/75 scaled version of the highest ...
Evaluation of eutrophication control strategies for the Keban Dam reservoir
Soyupak, S; Mukhallalati, L; Yemisen, D; Bayar, A; Yurteri, C (1997-04-15)
The reservoir of the Keban Dam in eastern Anatolia is a very deep and large water body subject to significant seasonal water level fluctuations within a given hydrological year. At the present time, different sections of the reservoir have different trophic status and the upper portion of the reservoir, in particular, is eutrophic. In this regard, there is a need for the assessment of alternative strategies to be implemented for phosphorus and thus eutrophication control in this segment of the reservoir. In...
Probabilistic tsunami hazard assessment at Seaside, Oregon, for near- and far-field seismic sources
Gonzalez, F. I.; et. al. (2009-11-24)
The first probabilistic tsunami flooding maps have been developed. The methodology, called probabilistic tsunami hazard assessment (PTHA), integrates tsunami inundation modeling with methods of probabilistic seismic hazard assessment (PSHA). Application of the methodology to Seaside, Oregon, has yielded estimates of the spatial distribution of 100- and 500-year maximum tsunami amplitudes, i.e., amplitudes with 1% and 0.2% annual probability of exceedance. The 100-year tsunami is generated most frequently by...
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.