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Eng ID Term Definition
2974
low water interval
See LUNITIDAL INTERVAL.
2975
low water line
See LOW WATER MARK.
2976
low water lunitidal interval (L.W.I)
Low water interval. See LUNITIDAL INTERVAL.
2977
low water mark
The inter­section of the plane of LOW WATER with the SHORE. The line along a COAST, or BEACH, to which the SEA recedes at LOW WATER. Also ca... more
The inter­section of the plane of LOW WATER with the SHORE. The line along a COAST, or BEACH, to which the SEA recedes at LOW WATER. Also called low water line.
2978
low water quadrature (L.W.Q.)
The average low water interval when the MOON is at QUADRATURE.
2979
low water stand
See STAND OF TIDE.
3000
lunitidal interval
The interval of time between the TRANSIT (upper or lower) of the MOON over the LOCAL or GREENWICH MERIDIAN and the next HIGH WATER or LOW WA... more
The interval of time between the TRANSIT (upper or lower) of the MOON over the LOCAL or GREENWICH MERIDIAN and the next HIGH WATER or LOW WATER at a place. The interval is assumed to be local unless otherwise specified. The average of all high water intervals is called mean high water lunitidal interval, high water interval, or corrected establishment. The average of all low water intervals is called mean low water lunitidal interval, or low water interval. The expressions higher high water interval, lower high water interval, higher low water interval, and lower low water interval are used when there is considerable DIURNAL INEQUALITY. See ESTABLISH­MENT.
3165
mean diurnal low water inequality
See DIURNAL INEQUA­LITY.
3172
mean lower low water (M.L.L.W.)
The average HEIGHT of the LOWER LOW WATERS at a place over a 19-year period.
3173
mean lower low water springs (M.L.L.W.S.)
The average HEIGHT of lower low water springs at a place.
3174
mean low water (M.L.W.)
The average HEIGHT of all LOW WATERS at a place over a 19-year period.
3175
mean low water lunitidal interval (M.L.W.I.)
See LUNITIDAL INTERVAL.
3176
mean low water neaps (M.L.W.N.)
The average HEIGHT of the LOW WATERS of NEAP TIDES. Also called neap low water.
3177
mean low water springs (M.L.W.S.)
The average HEIGHT of the LOW WATERS of SPRING TIDES. This LEVEL is used as a TIDAL DATUM in some areas. Also called spring low water.
3444
neap low water
See MEAN LOW WATER NEAPS.
3667
overtide
A shallow water harmonic tide constituent with a SPEED that is a multiple of the SPEED of one of the basic constituents of the TIDE-PRODUCIN... more
A shallow water harmonic tide constituent with a SPEED that is a multiple of the SPEED of one of the basic constituents of the TIDE-PRODUCING FORCE. See HARMONIC CONSTITUENT, and SHALLOW WATER CONSTITU­ENT.
4047
priming of the tide(s)
The acceleration in the TIMES of occurrence of HIGH and LOW WATER due to changes in the relative positions of the MOON and the SUN. The oppo... more
The acceleration in the TIMES of occurrence of HIGH and LOW WATER due to changes in the relative positions of the MOON and the SUN. The opposite effect is called LAGGING OF THE TIDES.
4341
refraction of water waves
The process by which the direction of a WAVE moving in SHALLOW WATER at an angle to the contours is changed. That part of the WAVE advancing... more
The process by which the direction of a WAVE moving in SHALLOW WATER at an angle to the contours is changed. That part of the WAVE advancing in shallower water moves more slowly than the other part still advancing in deeper water, causing the WAVE CREST to bend toward alignment with the underwater contours. Also called wave refraction. The bending of WAVE CRESTS by CURRENTS.
4534
sandwave
A large wavelike sediment feature in very shallow water and composed of sand. The wavelength may reach 100 metres; the amplitude may be up ... more
A large wavelike sediment feature in very shallow water and composed of sand. The wavelength may reach 100 metres; the amplitude may be up to 20 metres. Also sand-wave or sand wave. Sometimes called a mega-ripple.
4708
shallow water constituent
A short-period harmonic term introduced into the formula of ASTRONOMICAL TIDE con­stituents to take account of the change in the form of a T... more
A short-period harmonic term introduced into the formula of ASTRONOMICAL TIDE con­stituents to take account of the change in the form of a TIDE WAVE resulting from SHALLOW WATER conditi­ons. Shallow water constituents include OVERTIDES and COM­POUND TIDES. See HARMONIC CONSTITUENT.