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Eng ID Term Definition
4701
shading
Gradations of light, colour, or thickness of lines; or indications of shadows. Shading of lines is sometimes used on CHARTS to produce the e... more
Gradations of light, colour, or thickness of lines; or indications of shadows. Shading of lines is sometimes used on CHARTS to produce the effect of HEIGHT or DEPTH. See also HILL SHADING.
4702
shadow pin
A small rod or pin used to cast a shadow on an instrument, such as a MAGNETIC COMPASS or SUN COM­PASS, to determine the direction of the lu... more
A small rod or pin used to cast a shadow on an instrument, such as a MAGNETIC COMPASS or SUN COM­PASS, to determine the direction of the luminary; a GNOMON.
4703
shadow zone
A region into which very little sound energy penetrates.
4704
shallow
(adj.). Having little DEPTH.
4705
shallow
(n.). An area composed of unconsolidated material where the DEPTH of water is relatively slight. It may be a hazard to SURFACE NAVIGATION.
4706
shallows
An indefinite term applied to expanses of SHOAL or SHALLOW WATER.
4707
shallow water
Commonly, water of such a DEPTH that SURFACE WAVES are noticeably affected by bottom topog­raphy. It is customary to consider water of DEPT... more
Commonly, water of such a DEPTH that SURFACE WAVES are noticeably affected by bottom topog­raphy. It is customary to consider water of DEPTHS less than half the surface WAVE LENGTH as shallow water.
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 ... 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.
4709
shallow water corrections
Quantities to be applied to a TIDE PREDICTION to correct for the QUARTER DIURNAL TIDES.
4710
shallow water tide(s)
See TIDE.
4711
shallow water wave
See WAVE: TRANSITIONAL WATER.
4712
shear strength
The internal resistance of a body to shear stress.
4713
shelf
Geologically an area adjacent to a continent or around an island and extending from the low-water line to the depth at which there is usuall... more
Geologically an area adjacent to a continent or around an island and extending from the low-water line to the depth at which there is usually a marked incr­ease of slope towards greater depth. See also CONTI­NEN­TAL SHELF.
4714
shelf break
See SHELF EDGE.
4715
shelf edge (or shelf break)
The line along which there is a marked increase of SLOPE at the seaward margin of a CONTINENTAL (or ISLAND) SHELF.
4716
shell
The hard outside covering of an animal. Part of the ocean bed is composed of numerous shells of marine animals.
4717
shelving
A gently sloping area.
4718
shimmer
Apparent fluttering of objects at the EARTH's surface, when they are viewed in an almost horizontal direction above strongly heated surfaces... more
Apparent fluttering of objects at the EARTH's surface, when they are viewed in an almost horizontal direction above strongly heated surfaces.
4719
shingle
Rounded, often flat waterworn rock fragments larger than approximately 16 millimetres.
4720
ship of opportunity
An expression designating ships of commercial lines employed in gathering oceanogra­phic DATA.