A tidal jet is a fast-moving intrusion of water issuing from a narrow gap through a physical barrier between two bodies of water. The jet is generated by the pressure resulting from height differences between the two water bodies when the surface of one is rising with the tide, but the flow through the channel is too restricted to keep the levels equal. The reverse will occur when the tide is falling.
Tidal jets can occur in coral reef regions when an extensive outer barrier reef is penetrated by only a limited number of narrow channels. Such jets have been studied in considerable detail along the 650 km tract of ribbon reefs between 11 and 16°S on the northern Great Barrier Reef.
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