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In urban rivers, groups of large waves are generated when boats like tankers pass. These waves are the main cause of reed covered bank erosion. Reed banks are required in order to protect the riverbank and to provide inhabitant for wildlife. Therefore it is important to clarify a relationship between wave energy and rate of bank erosion. For this purpose, we constructed detached breakwaters in the Arakawa River to protect riverbanks from such waves, and attempted to measure energy dissipation so that boat induced wave effect can be included in the design of bank protection works. In this paper, the characteristics of a group of waves generated at each passing of a tanker and the effects of energy dissipation of the oncoming waves by detached breakwaters were measured. A relationship between wave energy dissipated by detached breakwaters and rate of bank erosions was also investigated.

CHARACTERISTICS OF A WAVE GROUP GENERATED BY A TANKER IN A RIVER AND EFFECTS OF DETACHED BREAKWATERS AS A BANK EROSION MEASURE