The Effect of Debris on Tsunami Velocity (original) (raw)

Abstract

Tsunami surges speeds on land depend on their heights and the surrounding land conditions such as slopes and the existence of obstacles. Many types of relatively loose obstacles may be carried away with the surge as debris. Such debris may reduce the kinetic energy of the surge resulting in reduced surge velocities. On the other hand the debris unlike the clear water, may produce additional impact when hit another obstacles such as buildings. Such impact may be significantly higher than the impact of clear water surge, as the debris could be a massive material. The research was focused on the effect of debris on tsunami surge velocities. Marbles and sand were used as a simplified debris model. The research was carried out in a flume of 16.8 m long, 0.6 m wide and 0.45 m high at Hydraulic and Hydrology Laboratory, Center for Engineering Science Universitas Gadjah Mada. The flume was equipped with a gate that could be open quickly to simulate a dam break type of a surge similar to the...

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