The phase of the fortnightly cycle when the solar tide partly cancels the lunar tide, so highs are lower and lows higher than average. Neaps occur about a week after springs, near the quarter moons. Currents are weaker at neaps, which makes them the preferred window for diving, mooring work and instrument recovery in strong tidal channels.
Book the divers for neaps, the current through the cut is half what it runs at springs.
Also heard as
- neaps
Related terms
Spring tide
A tide of larger than average range, occurring around new and full moon when Sun and Moon pull in line.
S2
The principal solar semidiurnal constituent, period exactly 12 hours, which beats with M2 to make springs and neaps.
Tidal range
The vertical difference between a high water and the neighbouring low water.
Neaped
Stranded after grounding near spring high water and unable to refloat until the next spring tides return.