Experimental Study on Edge Wave Effect Inducing by Tsunami at Phi-Phi Island (Thailand)

Abstract eng:
This study presents edge wave effect along Phi-Phi Island (Thailand) experimentally and compares the laboratory observations with the field trip. The model is made by paper boards and covered with a layer of cement-sand mixing. The physical model of Phi-Phi island has a vertical scale of 1:500 and a horizontal scale of 1:2500. The whole physical model was fixed in a 6m×6m steel tank. Waves are created by releasing the water from a long steel rectangular water tank (6m×0.5m×0.6m) by suddenly opening a gate. The initial water level in the water tank can be adjusted so as to create tsunami surges of various sizes. The experimental observations focus on the effect of edge waves, the run up height and the arrival time of tsunami. The results can explain why the damages on the tombolo are most devastating. It was found that the edge wave propagation is strongly affected by the size and shape of the island. The run up height at tombolo, wave height and wave speed were examined. These experimental observations provide a valuable bench results for calibrating and validating numerical models for tsunami waves.

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