Determination of Sediment Sound Speed Profiles Using Caustic Range Information
A method for determining sediment sound speed profiles is described. It employs measurements, obtained at various receiver heights, of ranges to the caustic which is formed due to a positive gradient in the sediment. The bottom profile can then be obtained from equations, derived using the WKB approximation, which relate the parameters of the water-bottom profile to the caustic range and source/receiver heights. Using an existing result, the theory is presented for the case of an isovelocity ocean overlying a sediment half-space with a linear gradient and continuous sound speed at the water-bottom interface. A new theoretical result is derived for the linear gradient case with a discontinuity at the water-bottom interface. The method is illustrated using data at 220 Hz.
KeywordsSound Speed Positive Gradient Source Height Bottom Profile Sound Speed Profile
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- 1.G.V. Frisk, J.A. Doutt, and E.E. Hays, “Bottom Interaction of Low-Frequency Acoustic Signals at Small Grazing Angles in the Deep Ocean,” submitted to J. Acoust. Soc. Am.Google Scholar