Experimental and numerical study of landslide in dam reservoirs

Date

2024-9

Author

Mohajer Barough, Reza

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Dam reservoirs are manmade lakes that may be subjected to extraordinary hydrodynamic pressures and water waves due to landslides, earthquakes, or both simultaneously when an earthquake triggers a landslide. There are many examples of dam failures after a landslide that cause water to overtop the dam body. Landslides on the other hand become more frequent due to erosion and floods. This study aims to derive a numerical model to simulate impulse waves generated by landslides in dam reservoirs. To this end, a 13 m × 6 m rectangular pool is constructed with two ramps on boundaries allowing blocks to slide into water to experimentally model the subaerial landslide into dam reservoirs. 305 experiments are conducted to study the effects of various parameters such as slide density, slide porosity, runout distance, slide impact angle, slide thickness, and still water depth on the generation and propagation of impulse waves and the overtopping water volumes from the dam crest. Larger runout distances lead to increased impact velocities which result in higher wave heights. Changes in slide densities do not have much effect on slide impact velocities but the slide energies have been affected which results in changes in generated wave heights. Slide porosity significantly affects generated wave heights and overtopping water over the dam crest. OpenFOAM which is an open source CFD toolbox, utilizing overInterDyMFoam solver with overset mesh method, and the k-ω (SST) turbulence model is used for numerically simulating the landslide generated impulse waves. The derived numerical 3D model has been validated by experimental results with a deviation of up to 7.6% in simulating the first wave’s maximum amplitude in areas near the impact zone, which can be helpful for further estimation of landslide hazards.

Subject Keywords

Landslide generated impulse waves, Dam safety, Landslide hazards, CFD modeling of impulse waves

URI

https://hdl.handle.net/11511/111383

Collections

Graduate School of Natural and Applied Sciences, Thesis