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Eng ID Term Definition
521
bottom: nature of
The feature of the BOTTOM including the material of which it is composed and its physical characteristics. Also called character (or charact... more
The feature of the BOTTOM including the material of which it is composed and its physical characteristics. Also called character (or characteristics) of the bottom, or quality of the bottom.
522
bottom characteristics
Designations used on survey and nautical charts to indicate the consistency, colour, and classification of the sea bottom. Also called NATUR... more
Designations used on survey and nautical charts to indicate the consistency, colour, and classification of the sea bottom. Also called NATURE OF THE BOTTOM, CHARACTER OF THE BOTTOM.
523
bottom contour chart
A chart designed for surface and sub-surface bathymetric navigation seaward of the 100-fathom contour. Bottom configuration is portrayed by ... more
A chart designed for surface and sub-surface bathymetric navigation seaward of the 100-fathom contour. Bottom configuration is portrayed by DEPTH CONTOURS and selected soundings.
524
bottom friction
The force resulting from the interac­tion between the ocean bottom and water particle motion over it.
525
bottom ice
See ANCHOR ICE.
526
bottom profiler
An ECHO SOUNDER for precision surveys of the sea bottom surface.
527
bottom relief survey
A survey conducted to obtain information on the spatial characteristics of the sea bottom relief.
528
bottom sample
A portion of the sea bottom material brought to the surface for examination. See also CORE.
529
bottom sampler
Any device for obtaining a BOTTOM SAMPLE. See also CORER, DREDGE, DRIVER ROD, GRAB and SNAPPER.
530
bottom sampling
The process of collecting bottom samples.
531
bottom sediments
See SEDIMENTS: BOTTOM.
532
Bouguer anomaly
A difference between an observed value of GRAVITY and a theoretical value at the point of observation, which has been corrected for the effe... more
A difference between an observed value of GRAVITY and a theoretical value at the point of observation, which has been corrected for the effect of the TOPOGRAPHY and ELEVATION only, the TOPOGRAPHY being considered as resting on a plane of indefinite extent.
533
boulder
A rounded ROCK with a diameter of 256 millimetres (about 10 INCHES) or larger.
534
boulder clay
See TILL.
535
boundary
Anything marking a limit; bound; BORDER.
536
boundary layer
The LAYER of fluid in the immediate vicinity of a bounding surface. It is the LAYER in which frictional forces are not negligible.
537
boundary monument
A material object placed on or near a boundary line to preserve and identify the ground location of the boundary line. Where it is impractic... more
A material object placed on or near a boundary line to preserve and identify the ground location of the boundary line. Where it is impracticable to establish a monument on or very close to a boundary line, the position of the boundary line on the ground is preserved by means of reference marks. The term monument is sometimes used to include both the mark on the boundary and the reference mark.
538
boundary wave
See WAVE: INTERNAL.
539
Bourdon tube
Closed, curved, flexible tube of elliptic cross-section which is deformed, according to type, by variations of ATMOSPHERIC PRESSURE or tempe... more
Closed, curved, flexible tube of elliptic cross-section which is deformed, according to type, by variations of ATMOSPHERIC PRESSURE or temperature and so provides a measurement of the particular element.
540
Bowditch rule
A method of ADJUSTMENT of TRAVERSES.