![]() ![]() They serve to protect vessels from river or tidal currents and to provide temporary mooring facilities if of solid construction, they may serve also as breakwaters. ![]() These structures, sometimes called lead-in jetties, form a funnel-shaped entrance to or exit from the lock. Jetties of open-pile or impervious-masonry construction may be built on each side of a navigation channel immediately outside the entrances to docks that must be entered through locks. These structures-variously termed spurs, spur dikes, and groins-may also be projected from the concave side of a river to retard bank erosion. Jettylike structures may be built out at intervals from the banks of rivers where a wide channel must be narrowed to concentrate the current and thus help maintain a navigable channel. The two principal kinds of jetties are those constructed at river mouths and other coastal entrances and those used for the berthing of ships in harbours and offshore where harbour facilities are not available. ![]() Jetty, any of a variety of engineering structures connected with river, harbour, and coastal works designed to influence the current or tide or to protect a harbour or beach from waves (breakwater). Heres how.Video by Ashley Jean Reese / The Island PacketRead more: https://w. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space! Products meant to protect coastal communities from erosion can also cause harm.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more. ![]() Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Figure 10-23.-Composite breakwater/jetty. Figure 10-22.-Rubble-mound breakwater/jetty. Rubble-mound breakwaters or jetties are constructed by dumping rock from either barges or railcars (running on temporary pile-bent structures) and by placing upper rock and cap rock with floating cranes. The width of its base depends on the width of the cap, height of the structure, and slope of the inner and outer faces. The width of its cap may vary from 15 to 70 feet. The simplest type of breakwater or jetty is the rubble mound (also called rock mound). A jetty works to direct and confine a current or tidal flow into a selected channel. Breakwaters and Jetties In an offshore barrier, the breakwater interrupts the action of the waves of open water to create an area of calm water between it and the shore. They are alike in construction and differ mainly in function. OFFSHORE Offshore structures include breakwaters and jetties. ![]()
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