Breakwaters are offshore structures built to protect harbours and marinas from wave action.. They are also used to help prevent beach erosion. The most common breakwater used has a core of small rocks or rubble with a covering of large rocks to keep the core from being washed away by the sea. The larger the rocks used in the cover, the more likely they will remain in place. Unfortunately the cost of the breakwater increases with the size of the rocks because of the cost of moving them into place and maintaining them. Blocks of concrete have also been used as covering with success. Civil Engineers study issues such as:
A solid concrete breakwater is sometimes used when clear water is a requirement such as in diving operations. The seabed must be prepared before placing the breakwater. Usually the crest of the supporting rubble is well below the surface of the water to prevent destruction by wave action.
Pile Supported Breakwaters
Alternative Breakwater Designs Faculty and graduate students at Queen's University are studying the use of "semi-transparent" structures which allow some flow to pass. Semi-transparent structures are desirable because they maintain natural processes and providing environmental advantages over conventional structures.
More pictures of breakwaters protecting international harbours. Interesting Trivia Powell River, BC - Floating breakwater comprised of 10 derelict ships protects 100 acres of log pong from wave action. Learn more... Associated Sites: |
Rockfill breakwater - Gibsons Landing, British Columbia
