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Originally Posted by Kapitan
very true this is most likely why we have so many problems finding the deisel boats in littoral waters due to the currents temprature and stuff.
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Definitely! I am no expert; but what I understand is that acoustic conditions in the Persian Gulf, for example, generally suck more than in the Atlantic because:
- Water depth. Sound travels better in deeper water.
- Bottom type. No hard rock bottom to bounce sound around.
- Salinity, the amount of salt in the walter. This varies greatly in the littoral because salt water meets fresh water at rivers. It can play havoc with sonar conditions.
- Background noise. Tends to be greater near coastal shipping.
- Temperature. Sound travels better in colder water.
Weather also plays a part, but the weather in the Gulf tends to be pretty good and doesn't apply to my example.
You can see this for yourself in DW which models a lot of this stuff (maybe even all of it?). Set up two test missions, one in the North Atlantic with: good weather, in winter, convergence zone SVP, set bottom type to rock. Set up another one in the Persian Gulf in summer with: bad weather (rain, 20 knots of wind on surface, sea state of 3. we'll pretend it's a bad day in the Gulf to illustrate this), bottom limited SVP, set bottom type to sand. You should see drastic differences in tracking ranges.
PD