bathymetry


bathymetry
bathymeter, n.bathymetric /bath'euh me"trik/, bathymetrical, adj.bathymetrically, adv.
/beuh thim"i tree/, n.
1. the measurement of the depths of oceans, seas, or other large bodies of water.
2. the data derived from such measurement, esp. as compiled in a topographic map.
[1860-65; BATHY- + -METRY]

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      measurement of ocean depth. The earliest technique involved lowering a heavy rope or cable of known length over the side of a ship, then measuring the amount needed to reach the bottom. Tedious and frequently inaccurate, this method yielded the depth at only a single point rather than a continuous measurement; inaccuracies arose because the rope did not necessarily travel straight to the bottom but instead might be deflected by subsurface currents or movements of the vessel.

      A more satisfactory approach, though not without problems, is echo sounding, widely used today, in which a sound pulse travels from the vessel to the ocean floor, is reflected, and returns. By calculations involving the time elapsed between generation of the pulse and its return and the speed of sound in water, a continuous record of seafloor topography can be made. Most echo sounders perform these calculations mechanically, producing a graphic record in the form of a paper chart. Misleading reflections caused by the presence of undersea canyons or mountains plus variations in the speed of sound through water caused by differences in temperature, depth, and salinity limit the accuracy of echo sounding, though these problems can be met somewhat by crossing and recrossing the same area. Sonar has also been employed in bathymetric studies, as have underwater cameras.

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Universalium. 2010.

Look at other dictionaries:

  • Bathymetry — Ba*thym e*try, n. [Gr. ba qos depth + metry.] The art or science of sounding, or measuring depths in the sea. [1913 Webster] …   The Collaborative International Dictionary of English

  • bathymetry — [ba thim′ə trē] n. [ BATHY + METRY] 1. the science of measuring the depths of oceans, seas, etc. 2. the topographic maps of the sea floor resulting from such measurements bathymetric [bath΄ə me′trik] adj. bathymetrical …   English World dictionary

  • Bathymetry — Present day Earth bathymetry (and altimetry). Data from the National Geophysical Data Center s TerrainBase Digital Terrain Model. Bathymetry is the study of underwater depth of lake or ocean floors. In other words, bathymetry is the underwater… …   Wikipedia

  • bathymetry — batimetrija statusas T sritis ekologija ir aplinkotyra apibrėžtis Ežerų, jūrų, vandenynų gylio matavimas specialiais prietaisais (batimetru, echolotu, lotu). atitikmenys: angl. bathymetry vok. Tiefenmessung, f rus. батиметрия, f …   Ekologijos terminų aiškinamasis žodynas

  • bathymetry — noun measuring the depths of the oceans • Syn: ↑plumbing • Derivationally related forms: ↑plumb (for: ↑plumbing), ↑bathymetric, ↑bathymetrical • Hypernyms …   Useful english dictionary

  • bathymetry — noun (plural tries) Etymology: International Scientific Vocabulary Date: circa 1859 the measurement of water depth at various places in a body of water; also the information derived from such measurements • bathymetric also bathymetrical …   New Collegiate Dictionary

  • bathymetry — the measurement of depth and relief in a water body …   Dictionary of ichthyology

  • bathymetry — noun The measurement of the depths of the seas …   Wiktionary

  • bathymetry — Synonyms and related words: altimetry, aquiculture, bathometry, biometrics, biometry, cadastration, cartography, chorography, craniometry, depth sounding, echo sounding, echolocation, fathomage, fathoming, geodesy, geodetics, goniometry,… …   Moby Thesaurus

  • bathymetry — ba·thym·e·try || bÉ™ θɪmɪtrɪ n. measuring of the depth of bodies of water …   English contemporary dictionary


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