Study on early detection of disappearance of longshore bar accelerating coastal erosion

Abstract

 Significant coastal erosion was developed on the Miyazaki Coast due to the partial disappearance of longshore bar. Laboratory experiments were conducted to investigate the relationship between the process of bar disappearance and the beach erosion. Analysis of high resolution nearshore topography data on the Miyazaki Coast suggested the disappearance of longshore bar would accelerate large scale beach erosion. Standard deviation of nearshore topography calculated in the longshore direction as well as two-dimensional wavelet analysis were found to be useful for the early detection of the bar disappearance.