Time-to-time interactive features among waves, currents and dynamic morphology changes are essential to quantitatively determine the beach erosion problems. This study puts special focus on the impact of dynamically changing beach profiles on the wave and current properties. We first developed a new set of image-capturing techniques that enabled us to obtain high-resolution quantitative data sets of waves, currents and bottom bed profiles both in time and space domains. In a 2D wave flume, multiple high-speed cameras and normal video cameras were installed beside the flume to capture the time-varying bottom bed profiles and spatial distributions of instantaneous current velocity and surface water fluctuations across the entire surf zone. Brightness of the obtained image was transferred to the instantaneous suspended sediment concentrations. The obtained data sets successfully describe the formation and onshore movement of the bars until they reach to the equilibrium state.
