Abstract
This paper is intended to estimate seasonal beach process and wave deformations at the Ida coast in the Shichiri-Mihama coast in Mie Prefecture. Field investigation by using an aerial photography technique is conducted along the Shichiri-Mihama coast from the Kumano river mouth to the Onigajo cape. It is clear that almost regions occurred beach erosion, especially Udono port region located on the left bank of the Kumano river, as the coastal line faced to sea, the beach protection works were struck by strong storms. Based on bottom sounding survey, maximum shoreline retreat was about one hundred meter for five years immediately after extend construction of breakwater around Udonoh arbor.It is necessary to predict wave deformation for erosion control around coastal protection facilities. It is presented a time-depend mild slope equation for estimating wave deformation. Some simple calculations were conducted for modeling artificial reefs at the severe beach erosion area where located northern Udono port. The numerical model has well explanations for generation of partial standing waves, drop of mean sea level behind artificial reefs.
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