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Definitions (259)
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orthophoto map
A map made by assembling a number of ORTHOPHOTOGRAPHS into a single, composite picture.
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bedding plane
A surface parallel to the surface of deposition, which may or may not have a physical expression. The original attitude of a bedding plane should not be assumed to have been horizontal. See also CROSS-BEDDING.
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nearshore current
The current system caused by WAVE action in and near the BREAKER ZONE, and which consists of four parts: the SHOREWARD MASS TRANSPORT of water; LONGSHORE CURRENTS; RIP CURRENTS; and the LONGSHORE movement of the expanding heads of RIP CURRENTS.
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ness
Roughly triangular PROMONTORY of land jutting into the SEA, often consisting of mobile material, i.e. a beach form.
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onshore current
Any current flowing towards the SHORE.
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allochtonous
A term applied to shelves that presently experience deposition of river-derived SEDIMENTS. See also DETRITUS.
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controlling depth
The least DEPTH in the navigable parts of a waterway, governing the maximum draft of vessels that can enter.
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national tidal datum epoch
A period of 19 years adopted by the National Ocean Service as the period over which observations of TIDES are to be taken and reduced to average values for TIDAL DATUMS.
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nautical mile
Also known as geographical mile, its length is 1852 meters (6076.115 feet), approximately 1.15 times as long as the statute mile of 5280 feet.
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neap high water
See NEAP TIDE.
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