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Water waves overtopping a truncated plane slope are considered. The single swash case considered by Peregrine & Williams (2001) is extended numerically to consider multiple swash events. Wave sets of random amplitudes with different periods are considered. A comparison is made between the two cases of overtopping and no overtopping. It is shown how the swash motion in the two cases is different.

Entrained air in the form of small bubbles, or as larger air pockets, is thought to play a key role in determining the rise times and magnitudes of pressures exerted on coastal structures. In this paper simple equations for an aerated flow are presented. The equations are solved numerically and applied to the problem of pressure pulses in thin cracks or fissures in sea walls or breakwaters. The possibility of large pressure amplification in the cracks is demonstrated.