Pos (1985) studied diffraction of waves by a gap, two breakwaters are parallel but not co-linear, in experiment and numerical method. The study on the breakwaters with asymmetrical configuration is relatively less, Memos (1980) derived the solution for two breakwaters at an angle, with a gap at the corner in one of the breakwaters, by Green's function method. In fact, the configurations of breakwaters mostly designed asymmetrical as an entrance of harbor. Suh and Kim (2008) derived analytic solutions for water wave diffraction by a semi-infinite breakwater or a breakwater gap of partial reflection follow the approach of Penney and Price (1952), the solution is extended to obliquely incident waves in Kim et al. Bowen and McIver (2000) derived an analytic solution for diffraction by a gap in a permeable breakwater. This topic gives an overview of reflection and refraction, with the emphasis on an interpretation in terms of waves. For the problem of permeable breakwater, Yu (1995) derived an approximate solution for diffraction of water waves normally incident to a semi-infinite permeable breakwater, and McIver (1999) extended the Yu's solution to obliquely incident waves using the Wiener-Hopf technique. Recently, more complicated situations have been researched, such as permeable breakwater, asymmetrical configuration of breakwater and irregular incident waves. The solutions presented as tables and diffraction diagrams in Shore Protection Manual (1984). The validity of solution of single breakwaters has been confirmed by Putnam and Arthur (1948) and the solution of a gap breakwater also verified by Blue and Johnson (1949) both in experiment. They proposed the solution for the waves propagate through a gap breakwater with symmetrical configuration by superposing the solutions for the semi-infinitely rigid breakwater. The analytic solution has been derived for diffraction of water waves around a semi-infinitely rigid breakwater by Penney and Price (1952), based on the Sommerfeld's (1896) solution for diffraction of light waves at the edge of a semi-infinite screen. as proof that light traveled as a shower of particles, each proceeding in a straight line until it was refracted, absorbed, reflected, diffracted. By understanding the physical process of wave diffraction, a designer can properly prevent diffracted wave energy from causing significant agitation within the shadow zone. By considering the two terms of the Sommerfeld equation of wave diffraction behind a semi-infinite breakwater separately, the influence of both the incident. This action is of high concern to designers of ports and harbors who use breakwaters as barriers to protect the interior from damaging wave energy. ![]() Water wave diffraction is the phenomenon where waves encounter an obstacle or gap and propagate into a sheltered area at a different angle than the original wave train.
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