諸官庁広報用パンフレットによる我が国海岸の現況調査

抄録

In order to assess the present state of Japanese Coast, pamphlets for public relations issued by the local and the central government agencies were gathered and analyzed. Results of this analysis clearly displayed the characteristics of Japanese Coast. The main issue to deal with on the coast is to prevent coastal disasters such as beach erosion, storm surge and large waves, and tsunami impact. Beach erosion occurs along the entire coastline and extensive countermeasure works have been carried out. The coastal areas where storm surge is a major problem are primarily located on the East China Sea, the Seto Inland Sea and the Southern part of Pacific Ocean Coast. Tsunamis often attack the Pacific Ocean Coast and they are especially serious in the Sanriku Coast. Coastal structures employed as protection works are mainly sea walls, detached breakwaters, jetties and sea dikes. The use of artificial reefs and beach fills for countermeasures are gaining popularity and several plans to execute such measures are scheduled. To recover sandy beaches that have been lost, many small artificial beaches are constructed and additional minor beach fills are planed throughout the coast, especially on Okinawa and along the coastline of the Seto Inland Sea.