393
Article 393 (13 more) in sci.engr.civil:
From: utidjian@remarque.berkeley.edu (David M.V. Utidjian)
Newsgroups: sci.environment,sci.engr.civil

Subject: Dredging.
Date: 31 Aug 1992 07:07:29 GMT
Organization: Processed People for a Processed America
Lines: 31
Distribution: world
Message-ID: <17sgfhINN3kn@agate.berkeley.edu>
NNTP-Posting-Host: remarque.berkeley.edu
Keywords: planes, maintenance, winglets
Originator: utidjian@remarque.berkeley.edu

Some years ago there was a dispute/discussion on how a certain
portion of the SF Bay was to be dredged to keep shipping channels
open.  The main problem is that when dredging operations stir up 
the muck it kills a lot of flora and fauna, at the very least, 
temporarily.  Another problem is wherever you dredged is going to
silt up again sooner or later.

I seem to remember that someone or somefirm proposed anchoring
little boomerang shaped winglets close to the bottom of the 
particular channel and as the tides went in and out of the bay
--MORE--(62%)the current passing the winglets would cause them to oscillate
which in turn would make the flow of water on the bottom turbulent.
This would give the desired result of lifting the silt and letting
the tidal currents carry the silt out of the bay.

This technique had some advantages over other dredging techniques.
-low energy consumption.
-keeps the turbid water low and close to the bottom.
-maintains the channel depth,(just leave it there).

Does any one remember this particular technique or
proposal?

Any and all responses would be welcome.... referrences too.

David Utidjian
utidjian@remarque.berkeley.edu

        "Don't sweat the technique?"
                                Anon.

End of article 393 (of 406)--what next? [npq] Article 396 (10 more) in sci.engr.civil:
From: eric@mpl.ucsd.edu (Eric Terrill)
Newsgroups: sci.environment,sci.engr.civil

Subject: Re: Dredging.
Date: 31 Aug 1992 18:46:19 GMT
Organization: Scripps Institution of Oceanography
Lines: 27
Distribution: world
Message-ID: <eric.44.0@mpl.ucsd.edu>
References: <17sgfhINN3kn@agate.berkeley.edu>
NNTP-Posting-Host: kiko.ucsd.edu
Keywords: planes, maintenance, winglets

In article <17sgfhINN3kn@agate.berkeley.edu> utidjian@remarque.berkeley.edu (Dav id M.V. Utidjian) writes:
>
>Some years ago there was a dispute/discussion on how a certain
>portion of the SF Bay was to be dredged to keep shipping channels
>open.  The main problem is that when dredging operations stir up 
>the muck it kills a lot of flora and fauna, at the very least, 
>temporarily.  Another problem is wherever you dredged is going to
>silt up again sooner or later.

--MORE--(64%)
The technique you are thinking of was developed and tested by 
Dr. Scott Jenkins, Scripps Institute of Oceanography,  Center for
Coastal Studies, sediment transport division

I don't know his e-mail address but you could write him at Scripps,
using the above information along with the post code:
La Jolla, CA  92093-0209


Good Luck
Eric

et@mpl.ucsd.edu
-------------------------------------------------------------------------
Eric J. Terrill                                         et@mpl.ucsd.edu
Scripps Institution of Oceanography, 0213               (619) 534-1085
La Jolla, CA 92093
End of article 396 (of 406)--what next? [npq] 