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In this study, the optimal slit length of perforated wall with single chamber below the still water level (SWL) is studied through the two dimensional test. The relationship between the reflection coefficient and the shape of structures such as chamber width(B) and slit length(S) are investigated by applying the various wave conditions. The random waves were used for the test by using Bretschneider-Mitsuyasu frequency spectrum. Minimum reflection coefficient is obtained at condition, this result is different from the regular wave condition. Also the minimum reflection coefficients are measured at . This means that the optimal slit length below the still water level is 2.5 times of the incident wave height.

Estimation of Optimal Slit Length of Perforated Wall below Still Water Level: Single Chamber Condition