R2Sonic 2022 - Graph 5: Seawater Absorption (Salinity 35 Ppt); Graph 6: Freshwater Absorption

Page 109 of 133
Version 3.0 REV r000
Date 25-08-2010
Graph 5: Seawater Absorption (Salinity 35ppt)
Graph 6: Freshwater Absorption
0
20
40
60
80
100
120
140
160
5° 10
°
15
°
20
°
25°
Absorption dB/km
Frequency and Temperature Influence on Seawater
Absorption
400kHz
200kHz
Degrees Celsuis
Mean values for water
depths from 50 metres to
300 metres (400 metres
for 200 kHz)
0
10
20
30
40
50
60
70
5° 10° 15° 20° 25°
Absorption dB/km
Frequency and Temperature Influence on Freshwater
Absorption
400 kHz
200 kHz
Degrees Celsius
Mean values for
water depths
from 50 metres
to 300
metres
(