OCS 2008 Chapter : Ocs 2007 Ch3
15 Mar 2019
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Document Summary
Measurement of ocean depths and the charting of the shape or topography of the ocean floor. Involves measuring the vertical distance from the ocean surface down to the mountains, valleys, and plains of the sea floor. Sounding was very performed in the mediterranean sea by posidonius. Refers to a probe of the environment for observation and was borrowed from atmospheric scientists who released probes called soundings into the atmosphere, doesn"t actually involve sound yet ironically. Formed in 1900s, sends a sound signal called a ping from ship down into ocean where it produces an echo when it bounces off any density differences, such as marine organisms or the floor. Lacks detail and often gives inaccurate view of sea floor. Pdr (precision depth recorder) 1950s, uses a focused-frequency sound beam to measure depths to a better resolution. Modern acoustic instruments include multi-beam echo sounders and side- scan sonar (sound navigation and ranging)
