[Acoustics] WM5 stops to work well

[Victor A Levesque]

Hello Paulo,

If you are using Water Mode 5, you probably don't have enough depth to 
resolve ambiguity. Try WM11 with the same WM5 settings...it will forget 
about resolving the ambiguity velocity when the depth gets too shallow.

Victor

Victor Levesque

U.S. Geological Survey
Florida Science Center
St. Petersburg and Tampa, FL
727-803-8747 extension 3085
813-975-8620 extension 167



Paulo Everardo Muniz Gamaro <pemg at itaipu.gov.br> 
Sent by: acoustics-bounces at simon.er.usgs.gov
06/20/2006 11:31 AM

To
"Nick j Everard" <nick.everard at environment-agency.gov.uk>
cc
acoustics at simon.er.usgs.gov
Subject
Re: [Acoustics] WM5 stops to work well






Hi Nick

Thanks, for your comment
I have achiving great measurements in this mode in his high limits, of
course higher you told me because is a 600
but here my problem is the contrary.

 I am measuring in a 1 meter depth, and near zero velocities, flat bottom 
,
so I think, or I am under his low limit, or a problem in the
hardware/firmware.
 It suppose to work, if I took : 10 cm depth cell, 25 cm blank, 10 cm
draft, plus around 10 for another cell would give me 45 cm as a minimun
depth, which is less then the minimun depth required (65 cm) , but  both,
less then the meter I measured.
 Or we have a third option here, low limit is not what we think in real
life.

Have any of you measure in such condition with a 600 khZ ?
Which is the shallow measurement you did with a 1200 ?

Cheers

Paulo



______________________________________________
PAULO EVERARDO M. GAMARO
Divisão de Estudos Hidrologicos e Energeticos
ITAIPU BINACIONAL
Brazil
fone +55 045 5206824
fax +55 045 5202074

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