Editing Jetty (section)

===At the outlet of tideless rivers===
[[File:Sebastian Inlet, Florida 001.jpg|thumb|North Jetty on the left and South Jetty on the right at the mouth of [[Sebastian Inlet]] in Florida from the [[Indian River (Florida)|Indian River]] to the Atlantic Ocean.]]

Jetties have been constructed on each side of the outlet [[river]] of some of the rivers flowing into the [[Baltic Sea|Baltic]], with the objective of prolonging the scour of the river and protecting the channel from being shoaled by the [[littoral]] drift along the shore. Another application of parallel jetties is in lowering the bar in front of one of the mouths of a deltaic river flowing into a tide — a virtual prolongation of its less sea, by extending the scour of the river out to the bar by banks.

Jetties prolonging the [[Sulina branch]] of the [[Danube]] into the [[Black Sea]], and the south pass of the [[Mississippi River]] into the [[Gulf of Mexico]], formed of rubble stone and concrete blocks, and respectively, have enabled the discharge of these rivers to scour away the bars obstructing the access to them; and they have also carried the sediment-bearing waters sufficiently far out to come under the influence of [[littoral]] currents, which, by conveying away some of the sediment, postpone the eventual formation of a fresh bar farther out (see [[river engineering]]).<ref name="EB1911" />