Pile-Supported Wave-Absorbing Breakwater with Low Crown Height: Barrier-Win T
Various types of sea area control structures were developed in the MMZ Plan (MLIT: Ministry of Land, Infrastructure, Transport and Tourism). In addition to the conventional protective functions of stabilizing beaches and protecting the hinterland, the aims of sea area control structures also include harmony between use and the environment, for example, marine recreation areas using quiet waters behind a breakwater, effective utilization of marine resources, and the like. Barrier-Win T is a structure that provides wave-absorbing performance equal to that of sea area control structures, as well as a certain level of wave-absorbing performance under storm-surge wave conditions and a wave force reduction effect. Because Barrier-Win T is a low-crested transmission-type structure, exchange of seawater with the open sea is good, and it does not block the view from the coast.
Hydlaulic Effects (Experimental Research and Simulations)
Wave force reduction: In comparison with the horizontal wave force obtained by experiments and the horizontal wave force calculated by Goda's formula, a wave force reduction rate of 0.7 or less was confirmed.
Wave height reduction: For the object wave-absorbing wave (period: 6-16s, wave height: 1-4m), Barrier-Win T satisfies a transmission rate of 0.6 or less and a reflection rate of 0.5 or less.
- Because all parts of the structure except the back wall are lower than mean sea level, the view from the coastline is not obstructed.
- Almost all of the structure except part of the crown is below water level, and thus is basically unaffected by the splash zone, which is a severe corrosion environment. In addition, only a small part of the piles is in direct contact with seawater.
- Horizontal wave force is small in comparison with ordinary upright breakwaters. As an additional feature, vertical wave force is extremely small.
- Barrier-Win T demonstrates the required wave-absorbing performance against the object wave of wave-absorbing design, making it possible to secure quiet waters behind the breakwater.
- Barrier-Win T also provides a certain level of wave-absorbing performance during high tide levels, making it possible to protect the hinterland from waves.