Tsunamis waves generated by landslides are a hazardous and destructive phenomenon. Understanding their generation is of crucial interest for hazard assessment in coastal areas. A landslide entering into water acts like a piston pushing the water and generating an impulse wave. This video illustrates the variety of surface gravity waves that can be generated by the horizontal impulse motion of a piston pushing a water layer. This reveals a rich and complex fluid dynamics. We highlight in this video how the piston stroke and velocity, together with the water depth, control the nature of the generated wave. The generation, propagation, and sometimes breaking, of the different waves, are presented to the viewer in this kaleidoscope of impulse waves.
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