Daisuke Maki

CHANGES OF HYDRAULIC CHARACTERS ON FLARING SHAPED SEAWALL AGAINST SEA LEVEL RISE

Changes of hydraulic characters on the Flaring Shaped Seawall were investigated on a supposition of sea level rise that might be brought near future. Two-dimensional hydraulic experiments were conducted to evaluate some hydraulic characters such as a checking effect of wave overtopping, wave reflection, wave overtopping rate, and wave pressure distributions against sea level rise. A critical maximum wave height, that is a maximum wave height on which no wave overtopping occurs at all, tends to decrease with sea level rise. The model equation that estimates the critical wave height was obtained, and its accuracy was verified. The wave overtopping rate increases with sea level rise. This increasing tendency on longer waves was more significant than that on shorter waves. A clear difference between Flaring Shaped Seawall and vertical one on their checking effect of wave overtopping was observed up to a certain decreased ratio of seawall crown height.