SVP

Question 1

Conjugate Depth

Answer 1

For a source below the sonic layer depth, that depth below the deep sound channel axis where the sound speed equals the speed at the source depth.

Question 2

Cutoff Frequency

Answer 2

That frequency below which an acoustic signal will tend not to be trapped in a layer or duct and is a function of the depth of the layer.

Question 3

Critical Depth

Answer 3

The depth below the deep sound channel (DSC) axis at which the sound speed is the same as it is at the sonic layer depth. The critical depth is the bottom of the DSC.

Question 4

Depth Excess

Answer 4

The difference between the bottom depth and the depth at which the sound velocity is equal to either the surface velocity when there is no layer depth, or the maximum velocity in the surface layer

Question 5

Sonic Layer Depth

Answer 5

The depth of maximum near-surface sound speed above the deep sound channel.

Question 6

Sound Channel Axis

Answer 6

The depth of minimum sound speed within a sound channel.

Question 7

Unadjusted speed through water

Answer 7

4800 fps

Question 8

Temperature vs. Sound Speed

Answer 8

Increase in 1 degree F = Increase of 6 fps

Question 9

Pressure vs. Sound Speed

Answer 9

Increase in 100 ft of depth = Increase in 2 fps

Question 10

Salinity vs. Sound Speed

Answer 10

Increase in 1 ppm = Increase in 4 fps