2007 年 23 巻 p. 159-164
This study investigates interaction between current and waves propagating in opposite direction of the current, based on laboratory experiments and numerical simulation. In particular, the characteristics of solitary and periodic waves propagating against the current are examined. Hydraulic experiments are carried out in a three dimensional wave basin in which open channel is installed. Numerical analyses are performed within the numerical wave tank capable of direct simulation of the flow fields under almost same conditions as in laboratory experiments. In case of periodic waves, both results show that the wave and current interaction increases the wave height first, and then it attenuates as wave propagates against the flow when the interaction affects the wave height distribution. In addition, the attenuation of the wave height caused by wave-current interaction depends on incident wave period and current velocity. In the case of solitary waves, however, there is few change of wave height compared to periodic waves.