養浜の波高減衰効果に関する実験的研究

Abstract

So far, coastal structures such as seawalls and groins are used for shore protection.However, these works are passive and unsatisfactory to prevent beaches from erosion dueto wave action, because the protective region by such structures is relatively narrow, andbesides the works always transfer beach erosion to adjacent areas, -more or less. Recentlytherefore the nourishment of beaches is often adopted as one of beach protection works.In this paper, the effect of nourished beaches on damping of wave height for the casesof wave steepnesses 0.01 and 0.02 is evaluated from the experiments with respect to therelations between the volume of nourishing sand, the damping rate of wave height and theheight of a submerged breakwater. In addition, the movement of shorelines after nourishmentto the equilibrium state is treated.