range2tl
Compute underwater sound transmission loss from range
Description
Examples
Input Arguments
Output Arguments
Algorithms
Three sources of transmission loss are modeled in the underwater sound channel functions
range2tl
andtl2range
.Relaxation effects for boric acid and magnesium sulfate. Relaxation effects depend on seawater salinity (S). alkalinity (pH). and temperature (T). The model assumes constant seawater salinity of 35 ppt (parts per thousand), pH of 8, and water temperature of 10°C throughout the sound channel.
Shear and bulk viscosity of pure water.
Geometric spreading loss is depth-dependent. For ranges less than or equal to the transition depth, the transmission loss is due to spherical spreading. For ranges greater than the transition depth, the transmission loss it due to cylindrical spreading. The transition depth is one-half the channel depth specified by the
depth
argument.
The transmission loss model is valid for frequencies up to and including 2.0 MHz.
References
[1] Ainslie M. A. and J.G. McColm. "A simplified formula for viscous and chemical absorption in sea water." Journal of the Acoustical Society of America, Vol. 103, Number 3, 1998, pp. 1671--1672.
[2] Urick, Robert J. Principles of Underwater Sound, 3rd ed. Los Altos, CA:Peninsula Publishing, 1983.
Extended Capabilities
Version History
Introduced in R2017b
See Also
sonareqtl
| sonareqsnr
| sonareqsl
| tl2range