ACOUSTICS UNPACKED

A General Guide for Deriving Abundance Estimates from Hydroacoustic Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TS Sv Noise Graph

TSSVGraph

SVTSGraph

Example

We are often interested in the TSuNZ and SvNZ levels at different depths. This program determines what those values are given the frequency of the acoustic unit, ambient temperature, and the TS value at 1 meter or the Sv value at 1 meter.

TSuNZ and SvNZ may be found as follows:

TSNZ   
  
SV   
TSSV   

 

where:
alpha

a

P = 1

f = frequency (e.g. 120 Hz)

T = Temperature (Celsius)

Ψ = - 20.8 dB

τ = 0.0004 s

c

and Z is depth in meters.