Effects of geometry on landslide generated tsunamis

Landslide generated Tsunamis are classified as a type of impulse waves. Several parameters including the geometry of the reservoir affect the behavior of impulse waves. The effects of geometry on impulse wave parameters are not yet fully understood. In order to investigate the effects of geometry on landslide generated impulse waves a total of 168 experiments were conducted in a wave basin of 2.00 m wide and 2.10 m long with a smooth bottom. The water level was kept constant at 0.10 m throughout the experiments. A block model has been used to simulate the landslides. Experiments were performed in a wave channel, a wave basin (at two different locations) and five diverging reservoir geometries with side angles of 15°, 30°, 45°, 60° and 75°. Plexiglass sheets at different angles were laterally placed inside the basin in order to achieve the desired geometries. The results of this study indicate that geometry of the reservoir affects wave parameters such as relative wave height, relative wave amplitude, relative wave period, relative wave height decay, and relative wave amplitude decay. It was found that relative wave height at the wave generation zone corresponding to the wave channel and the wave basin are identical. Wave parameters corresponding to the wave channel are larger than in the wave basin. Results of this project show a good agreement with Huber (1980) which implies that relative wave height in the slide impact zone for 2D and 3D deviates a little. It was observed that wave parameters corresponding to geometries with reservoir side angles larger than 45° follow a similar trend in the wave basin.

Subject

landslide generated tsunamis
impulse waves
reservoir
wave generation

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master thesis

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