Open AccessVARIATION OF FORESHORE DUE TO DETACHED BREAKWATERS
Author(s) -
Osamu Toyoshima
Publication year - 1982
Publication title -
proceedings of conference on coastal engineering/proceedings of ... conference on coastal engineering
Language(s) - English
Resource type - Journals
eISSN - 2156-1028
pISSN - 0589-087X
DOI - 10.9753/icce.v18.112
Subject(s) - breakwater , intertidal zone , erosion , flood myth , coastal erosion , geology , hydrology (agriculture) , geography , oceanography , geomorphology , geotechnical engineering , archaeology
As coastal areas are very valuable for mountainious Japan, many countermeasures against beach erosion have been taken. The length of seawalls for beach erosion amounts to 5,600 kilometers, which is much longer than the length of seadikes for flood tide, which is 2,900 kilometers. In addition, 10,000 groins and 2,300 detached breakwaters have already been constructed for beach erosion. Especially, we used many detached breakwaters for the last ten years. Fig.1 showes the increase of total length of seawalls and seadikes for the last twenty years.