HYDRAULIC MODEL TESTS ON SEAWALL DAMAGES DUE TO WAVE ACTION WITH BOULDERS

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  • 巨石を連行した波浪による護岸被害の再現実験

Abstract

<p> At the seawall of Port K under steep seabed conditions, the vertical wall was subsided due to the collision of boulders activated by the waves, and the pavement behind the seawall was damaged due to the boulders with overtopping waves. In this study, hydraulic model tests with irregular waves in a scale of 1/50 were conducted to clarify the characteristics of boulders activated by wave action that caused such damages. The relationship between equivalent offshore wave height and boulder run-up height was obtained by changing the diameter and specific gravity of a sphere model imitating boulders. Since the run-up height of the sphere has a correlation with the run-up height of the overtopping water mass, the relationship between the ratio of the two and the equivalent offshore wave height was shown. The collision forces of a sphere rolled by waves were measured by dynamometer, and the relationship between the irregular representative value and the equivalent offshore wave force was obtained. Furthermore, for the wave conditions at the time of the disaster, the amount of subsidence was calculated by obtaining the impact energy from the impact force of the sphere.</p>

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