This work presents laboratory experiments on effects of submerged obstacles on tsunami-like solitary wave and its run-up. This study was carried out for the breaking and non-breaking solitary waves on 1:19.85 uniform slope which contains a submerged obstacle. New laboratory experiments are performed, in medium-size wave tank, to describe the mitigation of tsunami amplitude and run-up under the effect of law-crested structures porosity. Four different obstacle porosities were used. To vary the obstacle porosity, we used gravel with different diameters, namely 3-8 mm, 8-15 mm, 15-25 mm and an obstacle perfectly impermeable. The results we obtained consist in the variation of the maximum run-up height value according to the wave height, and this for the four different porosities mentioned above, as well as the effect of this porosity on the shape of the wave downstream of the obstacle.
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