Controlling Machinery Induced Underwater Noise - NOAA
Controlling Machinery Induced Underwater Noise - NOAA
Controlling Machinery Induced Underwater Noise - NOAA
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FRV-40<br />
5-m Zodiac<br />
Tug & Barge @<br />
Supply Ship<br />
Large Tanker<br />
Drill ship, rigs,<br />
platforms<br />
Drill Ship<br />
Conical Drilling<br />
Unit<br />
DREDGING<br />
Ship 1<br />
Ship 2<br />
Range to 120 dB Level<br />
Source Level,<br />
dB re 1 μPa<br />
@1m<br />
150<br />
156<br />
171<br />
181-20=161<br />
190-20=170<br />
175-20=155<br />
185-20=165<br />
172-20=152<br />
185-20=165<br />
range, km<br />
Spherical<br />
spreading<br />
.03<br />
0.06<br />
0.4<br />
1.1->.11<br />
3.2->.32<br />
0.6->.06<br />
1.8->.02<br />
0.4->.04<br />
1.8->.02<br />
NCE/<strong>NOAA</strong> Symposium<br />
range, km<br />
1.5 power<br />
spreading<br />
.1<br />
0.25<br />
2.5<br />
12->.54<br />
46->2.1<br />
4.6->.2<br />
22->1<br />
3->.1<br />
22->1<br />
range, km<br />
Cylindrical<br />
spreading<br />
1<br />
4<br />
130<br />
1260->12.6<br />
10000->100<br />
320->3.2<br />
3200->32<br />
160->1.6<br />
3200->32
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