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A breakwater, also known in some contexts as a jetty or a mole, may be connected to land or freestanding, and may contain a walkway or road for vehicle access. Part of a coastal management system, breakwaters are installed parallel to the shore to minimize erosion .
A mole (a large breakwater) was then designed to improve the harbour and was planned to be 1,436 feet (438 m) long. The cost was about £340,000, and the improved harbour was to be 600 yd (550 m) long, 30 ft (9 m) deep at low tide, and capable of keeping out the roughest of seas. [ 11 ]
The channel, also, beyond the outlet of the river Nervion into the Bay of Biscay has been regulated by jetties; and by extending the south-west jetty out for nearly 0.5 miles (0.80 km) with a curve concave towards the channel the outlet has not only been protected to some extent from the easterly drift, but the bar in front has been lowered by ...
Humboldt Bay – Bay on the North Coast of California – jetties were reinforced using dolosse in the 1980s maintaining the entrance at one of the world's most treacherous harbor entrances; Czech hedgehog – Static anti-tank obstacle defense; Xbloc – Concrete breakwater element; KOLOS – Concrete breakwater element
Tetrapods on Graciosa Island, Azores Tetrapods in Latvia Tetrapods protecting a marina on Crete, Greece.. A tetrapod is a form of wave-dissipating concrete block used to prevent erosion caused by weather and longshore drift, primarily to enforce coastal structures such as seawalls and breakwaters.
Powerful waves crash over the breakwater in Morro Bay on Saturday, Dec. 30, 2023, as spectators watch from behind caution tape on the south side of Morro Rock. Joe Tarica/jtarica@thetribunenews.com
Located 6,500 feet (2,000 m) to the north of the original breakwater on a shoal known as The Shears, the new breakwater used much larger stone. The dressed and fitted masonry used individual pieces of up to 13 tons. The new breakwater was 8,040 feet (2,450 m) long at low water and 40 feet (12 m) wide.
Some examples include straight groynes, hockey stick or curved, inverted hockey stick groynes, tail or checkmark shaped groynes, L head, straight groynes with pier head (seaward end raised on the stilts, since the pier head is raised on the stilts it does not act as the breakwater), T-head (headland groyne, breakwater attached to the shore with ...