Abstract
In October 2009 the category-5 typhoon T0918 hit the Japan Pacific Coast and significant topographic changes occurred along the Enshu-nada coast due to the storm waves. Significant wave height was more than 10m and rapid landward migration of the sand spit of the Tenryu river mouth was observed. Based on X-band radar image analysis spatial and temporal changes of overtopping waves and corresponding sediment flux across the sand spit were revealed. Spatial concentration of the sediment flux can be explained by the nonlinear relationship between wave height of overtopping waves and corresponding sediment fluxes. A sediment flux model was developed based on the relationship. Maximum flux was estimated by the model to be 51 m3/m/hour. It happened when high waves and high tide were observed simultaneously.
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