Calculate the mean absorption in salt water — mean

This function is used to calculate the mean absorption in salt water over a frequency range.

Usage

mean_absorption(freq, r, depth, Ttab = NULL)

freq: Specifies the frequency range, freq = c(fmin, fmax) in Hz. For a single frequency, use a scalar value for freq.
r: The path (slant) length in metres.
depth: The depths covered by the path. This can be a single value for a horizontal path or a two component vector i.e., depth = c(dmax, dmin) for a path that extends between two depths.
Ttab: (optional) The temperature (a scalar) in degrees C or specifies a temperature profile Ttab = c(depth, tempr) where depth and tempr are equal-sized column vectors. Default value is an isothermal profile of 13 degrees.

The mean sound absorption over the path in dB.

After Kinsler and Frey pp. 159-160.

mean_absorption(c(25e3, 60e3), 1000, c(0, 700))
#>          [,1]
#> [1,] 7.728188