<![CDATA[The deformation of wave is the change of wave characteristics that occurs when a wave propa- gates shoreward. One form of the deformation of wave is diffracted wave. Wave diffraction occurs when a wave is blocked by a barrier which is a breakwater or an island. As a result, the wave will turn around the tip of the barrier and heading into a sheltered area behind it. In this event, the en - ergy transfer occurs in the perpendicular direction to the protected area. The phenomenon of wave diffraction is an important thing to consider in the harbor and breakwater design. To deter- mine the wave diffraction pattern caused by obstacles or coastal structures, wave propagation simulation has been carried out with mathematical or numerical models for several scenarios. In this study, two-dimensional wave simulation software using hyperbolic equations has been used to model wave propagation. The result obtained from this study is the diffraction coefficient whose value which is approximately equal to the ones suggested by the Shore Protection Manual (SPM, 1984). Changes in the pattern of the wave occur after the wave propagates through a single or double breakwater. This study also investigated the changes in the wave height and the amount of dominant wave period due to the influence of the breakwater. Both events indicate the occurence of phenomenon of diffraction.]]>
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