Head Loss at Tsunami-Breakwater Opening

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Abstract
The head loss at breakwater opening is an important factor for evaluating the effect of breakwaters against tsunami. This paper examines the coefficient of the head loss term in the equation of motion by comparing the results of numerical calculations with the actual record observed in the Port of Ofunato at the time of 1968 tsunami. Numerical calculations are repeated changing the head loss coefficient from zero to 3.0 with the interval of 0,5. The calculated water level variation is quite different from the record if no head loss is taken into consideration. Although the most suitable value of the coefficient is not definitely determined, the value of 1.5, which has been adopted in our previous calculations, seems to be reasonable for practical purpose.

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