[Acoustics] Rigging a Rio Grande and Riverboat to deploy off the bow

[Tyrel F Brandt]

Jeff, 

We did some work on a small side channel of the Missouri with the 
riverboat and a 1200khz extended 10 feet or so in front of the boat.  The 
data collected was fairly good.  The boat we used was large and had a very 
large jet motor.  It was fairly difficult to maneuver slow enough and hold 
on the edges.  The setup we used was just a piece of tubing attached to 
the front rails at one end with the boat mounted on the other.  It has to 
be soft mounted, it cannot be rigid.  Make sure to have good communication 
between your crew and line of sight for your driver to the boat helps.  If 
your driver is good you shouldn't have any problems.  I don't think you 
will get electrical interference from the motor.  Depending on your 
velocity's I don't think the motor will disrupt the flow, but I don't 
know.  We just set our boat up with a transom mount electric motor so let 
me know what you find out. 

Tyrel F Brandt
Hydrologic Technician
U.S. Geological Survey
Fort Peck Field Office
P.O. Box 124
East Kansas ST
Fort Peck, MT
(406) 526-3532 Voice
(406) 390-1306 Cellular
(406) 526-3651 Fax
tfbrandt at usgs.gov



Jeffrey J Kvech <jjkvech at usgs.gov> 
Sent by: acoustics-bounces at simon.er.usgs.gov
01/13/2006 12:55 PM

To
acoustics at simon.er.usgs.gov
cc
Jeffrey J Kvech <jjkvech at usgs.gov>, Daniel J Phelan <djphelan at usgs.gov>
Subject
[Acoustics] Rigging a Rio Grande and Riverboat to deploy off the bow






We're looking at making up a temporary rig to use a 1200kHz Rio Grande 
with an Oceanscience Riverboat extended off the bow. I'm hoping some of 
you can give me some hints as far what to do, or not do, as the case may 
be. On this particular boat, an electric trolling motor is mounted on the 
front, and will be in use, so we'll need to extend the ADCP some distance 
(5ft? 10ft?) beyond the motor. I have two questions related to the 
electric motor...........first, how far away is far enough so that the 
prop (which, according to the plan, will stay downstream of the ADCP) 
doesn't affect the measurement, in terms of disturbing the flow? ; and, 
second, would the electric motor cause any interference that we might need 

to worry about?

Thanks for any info.

Jeff Kvech, Hydrologic Technician, U.S. Geological Survey
Maryland-Delaware-D.C.  Water Science Center
8987 Yellow Brick Rd., Baltimore, MD 21237
(office)410-238-4244;  (mobile)410-925-8581
jjkvech at usgs.gov
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