Abstract
This study aims to investigate the characteristic behavior of severe wave inundation along the reef coast during typhoon event. Laboratory experiments were performed to represent storm waves transforming over shallow fringing reef. Image-based measuring technique was developed and applied to capture the wave characteristics as high-resolution data sets both in spatial and temporal domains. It was found through the obtained experimental data set that, besides significantly elevated mean water level, infragravity waves were generated and formed standing waves on the reef even though regular periodic waves were introduced to the flume. Amplitude of the observed resonant infragravity wave was highly dependent on the period of incident regular waves. Wave-induced radiation stress near the breaking point also had fluctuations with frequency of infragravity waves and the phase of this fluctuating radiation stress matched with that of estimated acceleration of horizontal velocity at the node of observed resonant infragravity waves. This wave-induced radiation stress near the breaking point may also change the period of infragravity wave or even vanish the evolutions of infragravity waves.
