Echo sounding is the technique of using sound pulses to find the depth of water. The interval from the emission of a pulse to reception of its echo is recorded, and the depth calculated from the known speed of propagation of sound through water. This information is then typically used for navigation purposes or in order to obtain depths for charting purposes. Echo sounding can also refer to hydroacoustic "echo sounders" defined as active sound in water (sonar) used to study fish. Hydroacoustic assessments have traditionally employed mobile surveys from boats to evaluate fish biomass and spatial distributions. Conversely, fixed-location techniques use stationary transducers to monitor passing fish.
The word sounding is used for all types of depth measurements, including those that don't use sound, and is unrelated in origin to the word sound in the sense of noise or tones. Echo sounding is a more rapid method of measuring depth than the previous technique of lowering a sounding line until it touched bottom.
Read more about Echo Sounding: Technique, Common Use, Use in Hydrography, Standards For Hydrographic Echo Sounding
Famous quotes containing the words echo and/or sounding:
“If I had not come to America, where I felt free to formulate tentatively insights at which I had empathically arrived, I would have accomplished very little. I would never have begun to publish, to teach, to undertake research. Because if one does not find an assenting echo to one’s ideas, if one is passed over, as I was in Vienna, then one cannot create. To create, after all, is to believe that what one says will count.”
—Margaret S. Mahler (1897–1985)
“The middle years are ones in which children increasingly face conflicts on their own,... One of the truths to be faced by parents during this period is that they cannot do the work of living and relating for their children. They can be sounding boards and they can probe with the children the consequences of alternative actions.”
—Dorothy H. Cohen (20th century)