AN EXPERIMENTAL STUDY OF TSUNAMI RUNUP ON DRY AND WET HORIZONTAL COASTLINES

Wave runup generated by a tsunami reaching the shoreline may induce devastating floo d waves. When tsunami wave breaking is associated with a plunging jet, some energy dissipation at jet impact and the downstream propagation of the surge is characterised by a high initial momentum resulting from the plunging jet. New experiments were performed in a large-size facility (15-m long 0.8-m wide channel). The experimental data highlight a large wave celerity during the initial stage (i.e. x/d o 30), the bore propagates at a speed similar to that predicted by the 'classical' analysis. The results highlight a reduced warning time downstream of plunging breaking wave.

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