[Acoustics] WinRiver Expert command

[David S. Mueller]

Daniel,

 

I can think of two reasons, one of which is good and one of which is bad.

 

First the bad approach. If there were considerable fish or submerged debris,
it is possible that the user was unable to collect good data because the
rejection algorithm kept eliminating beams. By turning it off they may have
been able to collect data, although not necessarily valid data. However,
this is recoverable in WinRiver because you can manually set the fish
threshold in the Configuration Settings, Processing tab. You can replay the
data set with the standard value for WA entered and the software will screen
the data as if the WA command had been set.

 

The good approach is that the user knew he could set the WA in software so
he decided to turn it off in hardware and simply apply the software filter.
This is certainly acceptable and is something that has been discussed as a
potentially recommended procedure but never officially recommended.

 

 

David S. Mueller

U.S. Geological Survey

Office of Surface Water

9818 Bluegrass Parkway

Louisville, KY 40299

 

dmueller at usgs.gov

 

Voice: 502-493-1935

Fax: 502-493-1909

Mobile:502-558-5907

 

  _____  

From: acoustics-bounces at simon.er.usgs.gov
[mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of McBride, Daniel J
MVR
Sent: Wednesday, August 10, 2005 3:27 PM
To: acoustics at simon.er.usgs.gov
Subject: [Acoustics] WinRiver Expert command

 

Greetings-

I was reviewing some [RDI ADCP] data collected by someone else, and I
noticed that they used the command "WA255", disabling the "false target
threshold maximum".  The documentation I have describes this as a feature
that screens, on a cell-by-cell basis, for things (fish) being detected in a
beam.  Can anyone explain the rationale behind disabling this function?  The
data was collected on the Mississippi River during high water, so there were
definitely fish and other things in the water being measured.

Thanks in advance,

Daniel McBride

Hydrologist

U.S. Army Engineer District, Rock Island

Water Quality and Sedimentation Section

CEMVR-ED-HQ

Clock Tower Building, P.O. Box 2004

Rock Island, IL  61204-2004

Phone: (309) 794-5720   Fax: (309) 794-5584

        E-mail: daniel.j.mcbride at mvr02.usace.army.mil

 

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