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- Path: sparky!uunet!paladin.american.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!uwm.edu!ogicse!amb4.ese.ogi.edu!jhurst
- From: jhurst@amb4.ese.ogi.edu (James Hurst)
- Newsgroups: sci.environment
- Subject: Re: Putting out Oregon fires
- Summary: Potential...
- Keywords: Stop the Orygun Firebomb Massacre, etc, etc.
- Message-ID: <41299@ogicse.ogi.edu>
- Date: 13 Aug 92 16:36:00 GMT
- Article-I.D.: ogicse.41299
- References: <1992Aug7.165114.6579@ncsu.edu> <41200@ogicse.ogi.edu> <Bsu34x.CLz@fmsrl7.srl.ford.com>
- Sender: news@ogicse.ogi.edu
- Distribution: usa
- Organization: Center of Nowhere
- Lines: 50
-
- Russ Cage write:
- > ... it occurs to me that FAE's
- >(fuel-air explosives) might be able to help in putting out
- >forest fires after all. What they could do is knock down
- >standing timber and remove branches from trees *ahead* of
- >the fire, like bulldozers cutting a fire break but immensely
- >faster.
-
- So we're talking about a linear explosion. I have no idea if this is
- feasible or not. Interesting possibility, but could you reliably lay
- down this kind of pressure wave without fire reaching the ground? The
- atmosphere is kind of elastic for that isn't it? Most of the time the
- system will be operating in rugged terrain.
-
- Knocking down the timber probably isn't enough, since it will still
- burn fine and hot on the ground. It *might* be enough to convert a
- crown fire to a ground fire, which could be a reasonable success in
- some cases. Good firebreaks are as wide as a road or wider, and clean
- to the mineral soil, so I'm a little skeptical this would work. Without
- salvage, your new firebreaks will dry out and become fire hazards in their
- own right next season.
-
- >If detonated high enough in the air, flame would
- >not reach the ground and ignition would be unlikely. If
- >propane is used as the fuel, the flame should be mostly
- >blue and clean and radiate relatively little heat.
-
- >My imagination conjures up images of re-usable bombs, basically
- >drone aircraft which are all wings and fuel tank, with spray
- >nozzles and dispensers for delayed igniters. They fly out,
- >level a stretch, and fly back for re-filling and re-stocking.
- >With nobody on board, nobody is at risk.
-
- Interesting. I'm skeptical. I think you're selling the people who work
- on fire protection short. It's no accident that aviation and fire protection
- are in a single division, and with lots of ex-military types flying for the
- forest service, the are presumably familiar with the technology available. My
- experience with the FS is that they are good to excellent about applying
- innovative solutions to their work.
-
- I'm also skeptical about the wisdom of fighting big fires head on. A more
- prudent and cost effective approach will probably be to manage the forests
- so that big fires are rare, and the landscape developed to provide natural
- breaks. That is, preventive care rather than crisis management. Still there
- will always be cases where fires threaten features worth protecting, so
- fire protection is not likely to disappear. The FS has lately taken a hard
- look at the economics of their fire programs, and is exploring the concept of
- controlled burns.
-
- Jim
-