[Acoustics] Tethered Boat/Catamaran

[Thomas R. Payne]

Greg,

We just used an Ocean Science trimaran/RDI Rio Grand Workhorse ADCP
system on a 200-300 foot wide, high gradient river with great success.
The components were a Kevlar line, small pulley, trimaran bridle, and
pull/feed tapes/ropes attached to the trimaran.  We used a 60 pound
compound bow and a fishing line arrow to cross the river and pull back
the line for attachment.  Feed rates were 1/2 foot per second, plus a
customized ADCP initialization sequence to handle standing waves and
entrained air at 1500 cfs, using a crew of three.  The rope and bridle
allowed instream obstructions (rocks) to be avoided by steering the
trimaran upstream/downstream.  The trimaran was fitted with dual
modems to transmit data back to a shore laptop.

Pricey system but highly effective and well worth it.  We were doing
10-12 fish habitat transects (pools, runs, riffles, pocket water) a
day with difficult, spread-out access.  Get back if you want more
specifics.

Tom Payne
Thomas R. Payne & Associates
Fisheries Consultants
Arcata, California


----- Original Message -----
From: "Greg Olsen" <gwolsen at usgs.gov>
To: "adcp" <acoustics at simon.er.usgs.gov>
Sent: Friday, November 01, 2002 11:18 AM
Subject: [Acoustics] Tethered Boat/Catamaran


> Greetings,
>
>    We have some cableways here in the Northwest
> that are no longer safe for use with manned cable
> cars, but would be fine to use with some type of
> system for tethering a catamaran/ADP system for
> doing discharge measurements.  My question is: has
> anyone out there developed a system that allows
> one to move an acoustic device mounted on a
> catamaran type platform across a stream, as in a
> clothesline type apparatus, or maybe utilizing an
> electric garage door opener or some other type of
> motorized device? I have heard rumors that our
> Canadian counterparts may be using something of
> this nature.  ANY info would be greatly
> appreciated!
>
> --
> Greg Olsen
> US Geological Survey, Water Resources
> http://oregon.usgs.gov
> 10615 SE Cherry Blossom Dr.
> Portland, OR.  97216
> (503)251-3267 Fax: (503)251-3470
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