EXPERIMENTAL STUDY ON WAVE FORCE ACTING ON DIFFERENT BREAKWATER SECTIONS DUE TO TSUNAMI OVERFLOWS / 津波越流時に防波堤各部に作用する波力特性に関する実験的研究
- Resource Type
- Journal Article
- Authors
- Azumi KADO; Junpei MORIOKA; Masayuki FUDO; Takenori SHIMOZONO; Yoshimitsu TAJIMA; 下園 武範; 不動 雅之; 森岡 純平; 田島 芳満; 門 安曇
- Source
- 土木学会論文集B2(海岸工学) / Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering). 2018, 74(2)271
- Subject
- breakwater
laboratory experiment
overflow
tsunami
wave force
- Language
- Japanese
- ISSN
- 1883-8944
1884-2399
Evaluation of wave force acting on breakwaters due to tsunami oveflows has been an important issue after the devastating 2011 tsunami event. A few studies, however, have targeted on wave force exerted on different sections of breakwaters such as head and corner sections which are likely to be weak to tsunami attacks. In this research, physical tests were conducted in a wave basin to investigate characteristics of wave pressure on different sections of a model breakwater under unsteady tsunami overflows. The results of the experiments suggested that the maximum wave force occurs around a timing of the higherst water level at each section and it is larger at a corner section due to local wave concentration and smaller at a head due to horizontal flow development than that exerted on a trunk of the breakwater. The effect of vertical flow acceleration is found to be significant especially in upper part of the breaktwater where the wave pressure tends to be 10-20 percent lower than hydrostatic pressure estimated from instantaneous water level.