A segment of the wave board has been expressed as a submerged line segment in the two dimensional wave flume. It is assumed that the motion of the wave board could be defined by the sinusoidal motion in horizontal direction on either end of the wave board. When the amplitude of sinusoidal motion of the wave board on lower and upper end are equal, the wave board motion could express the horizontally oscillating submerged segment of piston type wave generator. The submerged segment of flap type wave generator also could be expressed by taking the motion amplitude differently for the either end of the board. The pivot point of the segment motion could play a role of hinge point of the flap type wave generator. Simplified analytic solution of oscillating submerged wave board segment in water of finite depth have been derived through the first order perturbation method at two dimensional domain. The case study of the analytic solution have been carried out and it is found out that the solution could be utilized for the design of wave generator with arbitrary shape by linear superposition.

The design procedure of novel wavemaker system has been suggested and careful investigation on the mechanical compatibility has been carried out. The oscillation characteristics of the wave board could be specified by selecting the amplitude, frequency and the phase lag separately actuating at either end of the board. Therefore the solution could be utilized for representing the ordinary flap-type or piston-type wavemakers in arbitrary submergence. At the same time the solution could express various excitation motion of board such as dual mode oscillation in arbitrary phases at either end of the board. It is believed that the general solution of the submerged wave board could utilized not only for the design of ordinary wavemaker but also for the development of novel wavemakers which operate in a dual mode oscillation on either end of the wave board.

For validation of the solution, special wavemaker was designed, manufactured and installed in the wave flume. This wavemaker can materialize various wave making motion with double flap, single flap, underwater flap and piston-flap. Some cases of various wavemaker has been tested to measure wave height and compared the results with the other''s. Irregular waves test also performed in the wave flume with the designed wavemaker. Correlation between wave height and wave frequency was adopted in control algorithm of wavemaker.