The Analysis of Beach Survey Data and Prediction on The Movement of Shore Line

Abstract

An arched beach between capes or harbors becomes to form a stable shore line after repeated erosion and sedimentation for the effect of geographical features.
The arched beach -so called Pocket Beach- which length is approximately 5 kilometers located in Iwanai Town, Hokkaido, is lying between the existing public harbor on the south and the exclusive harbor completed in 1983 for HEPCo.'s Tomari Nuclear Power Plant on the north. The new east breakwater at the public harbor is constructing from 1986. Based on the analysis of beach survey data from 1983 to 1995 on this coast, a numerical model predicting the movement of shore line is modified to ascertain the effect of harbors, and the result of calculation shows the actual movement of shore line.