[Acoustics] Re: Acoustics Digest, Vol 32, Issue 6

[RMarsden at Teledyne.com]

NIck,

The high frequency of the StreamPro would be more likely to read shallower 
than a staff since the StreamPro should reflect off the top surface of the 
silt.

Are you sure that the transducer depth was set correctly in the StreamPro 
software?  If the transducer depth were set too deep, then the total depth 
would be off by the same amount. 

Please send me the data and xml files and I will take a look. If you have 
an electroinic version of the convertional field data, please send that as 
well.

Randy Marsden
Water Resources Applications Scientist
Teledyne RD Instruments
Ph: 858-693-1178
rmarsden at rdinstruments.com



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Acoustics Digest, Vol 32, Issue 6






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Today's Topics:

   1. false bed (Nick Wray)


----------------------------------------------------------------------

Message: 1
Date: Fri, 17 Mar 2006 12:27:30 +0000
From: "Nick Wray" <nick.wray at environment-agency.gov.uk>
Subject: [Acoustics] false bed
To: <acoustics at simon.er.usgs.gov>
Message-ID: <s41aab3d.021 at environment-agency.gov.uk>
Content-Type: text/plain; charset=US-ASCII


Whilst using a stream pro 2.4Mhz to gauge a section of slow river that
had a bed of light silt (no moving bed)   the depth recorded was deeper
than measured by staff. Is the ADCP ping being absorbed slightly by the
silt before returning the echo hence measuring a deeper depth.and
therefore a greater area than actual.

Nick

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