Keeping the blogosphere posted on the goings on of the world of submarines since late 2004... and mocking and belittling general foolishness wherever it may be found. Idaho's first and foremost submarine blog. (If you don't like something on this blog, please E-mail me; don't call me at home.)

Tuesday, May 03, 2005

Proving a Negative

This article in the Virginia Pilot on the proposed Navy Sonar Range and accompanying discussion of the possible effects of active sonar use on marine mammals shows what the Navy is up against whenever there's a beaching of whales or dolphins. Excerpt:

"The Navy concedes that its use of mid frequency sonar contributed to the stranding of 17 whales and dolphins, seven of which died, during sonar training in the Bahamas in 2000 , an event it had initially characterized as an unfortunate coincidence unrelated to its exercises.
"There are other possible links between mid frequency sonar and animal distress :
"Hours after NATO naval exercises off the Canary Islands in 2002, 14 beaked whales stranded and died. Scientists later determined that 10 of the animals had developed nitrogen gas bubbles in their tissues and blood vessels, possibly from surfacing too quickly in reaction to sonar.
"In waters off Washington state in 2003 , a Pacific-based destroyer was conducting sonar exercises at the same time a pod of killer whales was observed behaving erratically. Within a month of that drill, 14 harbor porpoises were found dead. A government report concluded that it was impossible to tell whether the whales had suffered hearing loss or whether the dead animals showed signs of acoustic trauma.
"As many as 200 melon-headed whales in Hanalei Bay, Hawaii, came unusually close to shore and showed clear signs of stress in 2004 . A six-ship group of U.S. and Japanese naval vessels had started sonar exercises 20 miles away that morning."


As you can see, anytime there are sonar exercises anywhere in the vicinity of a beaching, people will immediately blame the active sonar. While sonar use probably does contribute to some of the beachings, it's also clear that there are many other beachings which aren't related to sonar use; conversely, there are many times the sonar is used in the vicinity of marine mammals that don't lead to adverse effects. I think the most important thing for everyone involved is to set up some reasonable rules for the operation of the new range while still recognizing that it serves a vital military purpose.

8 Comments:

Blogger ninme said...

Dolphin butcher!

5/04/2005 12:06 AM

 
Blogger Bubblehead said...

Untrue! I love dolphins... my favorite times at sea were when I was OOD on the surface, and the dolphins would swim in from a mile away to ride the bow wave. I found that they liked it best when the boat was at 12 knots; 15 knots was a little fast for them, and 10 knots didn't generate enough of a wave.

5/04/2005 12:11 AM

 
Blogger StinKerr said...

I have pics of dolphins riding the bow wave of the various destroyers I served on. I was a Sonar Tech and I assure you that when we were at sea the sonar was always pinging.

My service time was the late 60's and early 70's and the sonars (AN/SQS-39 to 46 series & AN/SQS-23) were not as powerful as today's sonars.

However, if the modern sonars are powerful enough to cause dolphins and whales to beach at a distance, why aren't there vast reefs of dead fish in the wakes of modern sonar emitters?

5/04/2005 2:03 AM

 
Anonymous PigBoatSailor said...

Willy Shake and I just recently had a similar discussion, b/c of similar accusations in the wake of the USS Philly exercises. Exercises, I might add, that were SEAL training, and PD prep active use – i.e. All HF active sonar, the type that has –never- been shown to be damaging… Anyway,
here is the address of that particular discussion, not linked as HTML hates me:
http://unconsideredtrifles.blogspot.com/2005/05/upon-beached-verge-of-salt-flood.html#comments

5/04/2005 8:01 AM

 
Blogger ninme said...

*sigh*

about those passengers...

5/04/2005 2:47 PM

 
Blogger StinKerr said...

Thanks, PigBoatSailor. I've left a comment over there too. You may not believe it, but I edited it for brevity. Cut out a whole sea story that somehow worked its way into the comment.

5/04/2005 4:56 PM

 
Blogger Vigilis said...

Belated entry (remembered but could not find until now) this related bit of history (now on Ebay): "1903 Print French Submariners Murder Dolphins" see link:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=10882&item=7158104185&rd=1
Ironic and enlightening, n'est pa?

5/20/2005 2:49 PM

 
Anonymous Russian Architecture said...

love dolphins even though i haven't seen the real ones. ive only seen them on tv.

1/01/2010 6:56 AM

 

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