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Jetties are hard structures built at the banks of tidal inlets and river mouths to trap longshore sediment, thereby stabilizing the inlet or river mouth and preventing channel siltation. Jetties are solid and durable and are considered a hard-engineering protection measure.
Though jetties serve the same purpose as groynes they are different in in that they are constructed at tidal inlets and river mouths, are typically larger, and also extend greater distances offshore (Davis Jr and Fitzgerald 2004). They are built to line the banks of tidal inlets or river mouths, aiming to stabilize one or both banks from shifting position and prevent large volumes of sand from filling the inlet/river mouth, thus maintaining an open and navigable channel. Jetties may also be used to prevent spit growth into a tidal inlet, thereby maintaining water exchange with the open sea, as well as commercial and recreational navigation.