Add to ORKGIn this paper, a theory of long waves around a breakwater is introduced by use of the method of the buffer domain, the behaviors of the waves thereabouts being elucidated with the aid of an electronic computer. Among the obtained results, the most conspicuous feature is an appearance of the reflected waves which produce a maximum wave height exceeding twice the amplitude of the incident waves in the nearby part of the mouth of a breakwater, causing a rotation of waves as a complementary flow. Other than the approximated theories developed so far, the boundary conditions at the rigid walls of two breakwater wings are satisfied rigorously in the theory established in this paper (by use of the method of the buffer domain).本報告において防波堤のまわりの長波に関する...