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  2. Bathymetry - Wikipedia

    en.wikipedia.org/wiki/Bathymetry

    Bathymetry (/ b ə ˈ θ ɪ m ə t r i /; from Ancient Greek βαθύς (bathús) 'deep' and μέτρον (métron) 'measure') [1] [2] is the study of underwater depth of ocean floors (seabed topography), lake floors, or river floors. In other words, bathymetry is the underwater equivalent to hypsometry or topography.

  3. Bathymetric chart - Wikipedia

    en.wikipedia.org/wiki/Bathymetric_chart

    Bathymetric charts showcase depth using a series of lines and points at equal intervals, called depth contours or isobaths (a type of contour line). A closed shape with increasingly smaller shapes inside of it can indicate an ocean trench or a seamount, or underwater mountain, depending on whether the depths increase or decrease going inward.

  4. Depth gauge - Wikipedia

    en.wikipedia.org/wiki/Depth_gauge

    A depth gauge is an instrument for measuring depth below a vertical reference surface. They include depth gauges for underwater diving and similar applications. A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough ...

  5. Depth sounding - Wikipedia

    en.wikipedia.org/wiki/Depth_sounding

    A sailor and a man on shore, both sounding the depth with a line. Depth sounding, often simply called sounding, is measuring the depth of a body of water.Data taken from soundings are used in bathymetry to make maps of the floor of a body of water, such as the seabed topography.

  6. Bathometer - Wikipedia

    en.wikipedia.org/wiki/Bathometer

    The depth was determined (rather inaccurately) by the time it took to surface. [3] Jacob Perkins (1766–1849) proposed a bathometer based on the compressibility of water. [ 4 ] In this instrument the movement of a piston compressing a body of water enclosed in its cylinder is dependent on the pressure of the water outside the cylinder, and ...

  7. CTD (instrument) - Wikipedia

    en.wikipedia.org/wiki/CTD_(instrument)

    The instrument is lowered into the water in what is called the downcast to a determined depth or to a few meters above the ocean floor, generally at a rate of about 0.5 m/s. Most of the time a conducting wire cable is attached to the CTD frame connecting the CTD to an onboard computer, and allows instantaneous uploading and real time ...

  8. Bathythermograph - Wikipedia

    en.wikipedia.org/wiki/Bathythermograph

    Maximum Depth Rated Ship Speed Vertical Resolution T-4: Standard probe used by the U.S. Navy for ASW operations: 460 m 1500 ft: 30 knots: 65 cm T-5: Deep ocean scientific and military applications: 1830 m 6000 ft: 6 knots: 65 cm Fast Deep: Provides maximum depth capabilities at the highest possible ship speed of any XBT: 1000 m 3280 ft: 20 ...

  9. Marine geophysics - Wikipedia

    en.wikipedia.org/wiki/Marine_geophysics

    Objectives of marine geophysics include determination of the depth and features of the seafloor, the seismic structure and earthquakes in the ocean basins, the mapping of gravity and magnetic anomalies over the basins and margins, the determination of heat flow through the seafloor, and electrical properties of the ocean crust and Earth's mantle.