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Eng ID | Term | Definition |
---|---|---|---|
|
5801 | Universal Transverse Mercator (UTM) grid | See GRID. |
|
5802 | unprotected reversing thermometer | See THERMOMETER. |
|
5803 | unrecoverable station | See STATION. |
|
5804 | unsurveyed area | An area where HYDROGRAPHIC SURVEY data is non-existent. |
|
5805 | unsurveyed clearance depth | The estimated depth over an unsurveyed wreck or obstruction over which the exact depth is unknown but which is considered to have a safe cle... more |
|
5806 | upland | The higher GROUND of a region contrasted with the VALLEYS and PLAINS. Used in contrast to LOWLAND. |
|
5807 | uplifted reef | A CORAL REEF exposed above water level. |
|
5808 | upper branch | That half of a MERIDIAN or CELESTIAL MERIDIAN from POLE to POLE which passes through a place or its ZENITH. |
|
5809 | upper culmination | Upper TRANSIT. |
|
5810 | upper limb | See LIMB. |
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5811 | upper limit of navigability | The character of a river will, at some point along its length, change from navigable to non‑navigable. Very often that point will be at a ma... more |
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5812 | upper transit | See MERIDIAN TRANSIT. |
|
5813 | uprush | The rush of water up onto the BEACH following the breaking of a WAVE. See RUN-UP. |
|
5814 | upstream | (adj. & adv.). Toward the SOURCE of a STREAM. The opposite is DOWNSTREAM. |
|
5815 | upwelling | The process by which water rises from a lower to a higher DEPTH, usually as a result of DIVERGENCE and offshore CURRENTS. See SINKING. |
|
5816 | upwind | (adj. & adv.). In the direction from which the WIND is blowing. The opposite is DOWNWIND. |
|
5817 | vacuum lead | A CORER which makes use of HYDROSTATIC PRESSURE to force a tube into the BOTTOM SEDIMENT. |
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5818 | valley | A long DEPRESSION or hollow in the LAND lying between HILLS or stretches of high GROUND and usually having a RIVER or STREAM flowing along t... more |
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5819 | valley: median | See MEDIAN VALLEY. |
|
5820 | valley: submarine | A relatively shallow wide DEPRESSION, the bottom of which usually has a continuous GRADIENT. This term is generally not used for features th... more |