UNDESIRABLE USAGE OF GENTLY SLOPING REVETMENT AND ITS CORRECTION METHOD

Undesirable usage of gently sloping revetment was investigated taking the cases on the Kaike coast in Tottori Prefecture and the Kitanowaki coast in Tokushima Prefecture as the example. On these beaches, gently sloping revetment was built in front of the existing vertical seawall resulting in narrowing of natural sandy beach. The reason is due to the fact that construction works in order to enhance coastalenvironment are only possible in the narrow coastal preservation zone designated by law. This issue is summarized by the relationship between the locations of the shoreline, foot of sloping revetment and seawall. Correction method is shown.