Abstract
Vecocity field in a harbor due to tsunami as well as free surface displacement was investigated experimentally to discussbottom topography change. Vortices generated near a breakwater head and inside the harbor were clearly observed. Mechanism of the bed topography change featured as an accumulation in the center of the habor and erosion in surroundingarea of the accumulation was explained with the velocity field and observation of trace of sand movement. Using ananalytical solution and the measured velocity as boundary conditions, an radial velocity component in Ekman layer wasestimated to be about 30% of the azimuthal one.
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