わが国における潮位と海岸線の長期変化の関連について

Abstract

Beach processes and coastal development are affected by changes in sea level. Studies ofshoreline and sea level changes have become very important. In recent years, sea level changeis being studied by many geologists, as well as coastal engineers. The purpose of this paper isto clarify the characteristics of shoreline changes associated with sea level rising from historicaland geological times. Because recent subsidence in coastal areas contributes to shoreline changes, data of tidal observation are rearranged carefully. It is concluded that the annual rising ratesof sea level are estimated to be about 2 mm in Osaka and 1 mm in Aburatsubo respectively, and that beach erosion at Niigata coast is caused significantly by subsidence due to miningnatural gas, plus by action of stormy waves.