tidal lock

tidal lock

[′tīd·əl ′läk]
(civil engineering)
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References in periodicals archive ?
But a strong tidal lock keeps the Sun directly over Mercury's equator at all times, such that crater interiors near the poles -- some down to 80 [degrees] in latitude -- are never exposed to direct sunlight.
He said another advantage of Mostyn was that port users did not have to negotiate tidal locks.
He said the Welsh port had been chosen as the onshore base for the project because of the availability of a large quayside area and the fact that port users did not have to negotiate tidal locks.