[Acoustics] Re: Acoustics Digest, Vol 29, Issue 4

[Pedro Moreira]

Randy,

Today,  a colleague from our Manaus office sent the raw data and config 
files of some measurements made in last november,1. It is available at CPRM 
FTP area in the folder /ftpcprm/ADCP/Porto Velho with the others uploaded 
earlier. (ftp://ftpcprm:ftpcprm@ftp.cprm.gov.br).
There was no bad ensembles and bad bins were around 1%. They used single 
pings ensembles and configuration wizard commands and increased bottom pings 
to 2 (BP2) as suggested by RDI field service. The 600 kHz WH Monitor 
firmware was updated recently to version 16.27. Standard Dev./Average 
calculated by WinRiver and showed at Discharge History Tabular View was only 
0.01. Mean discharge = 7.300 m3/s and max. velocity 1,5 m. Please, see some 
screen capture contained in pdf file comparing intensity, backscatter and 
velocity plots between measurements made in february and november/2005..

Measuments made with a 600 kHz Rio Grande, firmware 10.14, in february max. 
velocity almost doubled and mean discharge was around 26.000 m3/s (?). 
That´s when bottom tracking begin to fail.

Regards,

Pedro Moreira
CPRM - Brazilian Geologic Service
Hydrology Department
Rio de Janeiro - Brasil
55 21 2546-0352

----- Original Message ----- 
From: <acoustics-request at simon.er.usgs.gov>
To: <acoustics at simon.er.usgs.gov>
Sent: Saturday, December 10, 2005 4:03 PM
Subject: Acoustics Digest, Vol 29, Issue 4


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>   1. RE: Acoustics Digest, Vol 29, Issue 3 (Randy Marsden)
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> Message: 1
> Date: Fri, 9 Dec 2005 10:47:45 -0800
> From: "Randy Marsden" <rmarsden at rdinstruments.com>
> Subject: [Acoustics] RE: Acoustics Digest, Vol 29, Issue 3
> To: <acoustics at simon.er.usgs.gov>
> Message-ID: <D07AC0DAEF7F464CBCAC6BAD375584F7E36C at RDINT5.RDI.ADCP>
> Content-Type: text/plain; charset="us-ascii"
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> Pedro,
>
> Please send the data and configuration files to RD Instruments field
> service for analysis. You can put them in the incoming folder at
> "ftp.rdinstruments.com" and send an email to rdifs at rdinstruments.com .
>
> Randy Marsden
> Water Resources Applications Scientist
> Teledyne RD Instruments
>
> Ph: 858-693-1178
> email: rmarsden at rdinstruments.com
>
>
> -----Original Message-----
> From: acoustics-bounces at simon.er.usgs.gov
> [mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of
> acoustics-request at simon.er.usgs.gov
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> To: acoustics at simon.er.usgs.gov
> Subject: Acoustics Digest, Vol 29, Issue 3
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>   1. High number of bad ensembles (Pedro Moreira)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 8 Dec 2005 18:25:08 -0200
> From: "Pedro Moreira" <pneto at rj.cprm.gov.br>
> Subject: [Acoustics] High number of bad ensembles
> To: <Acoustics at simon.er.usgs.gov>
> Cc: Newton de Oliveira Carvalho <newtonoc at openlink.com.br>,
> "naziano.filizola" <naziano.filizola at ig.com.br>
> Message-ID: <002301c5fc35$7bea3520$cf10000a at pedro>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hello,
>
> I wonder if any one you have experienced ADCP river discharge
> measurements with exaggerated number of single ping bad ensembles (40%
> and even 60% of total ensembles) and identified the cause.
>
> Amazon basin is a challenge for river measurements with doppler effect
> based equipments. Madeira river has a high sediment concentration ( >
> 2.000 ppm) and mooving bottom at Porto Velho site. The measuments were
> made by ANA (Brazilian National Agency) and HIBAM (Hydrology of Amazon
> Basin) with a 300 and 600 kHz WorkHorse Monitor ADCP, Winriver wizard
> commands, maximum depth = 35 meters and averaged discharge between
> 23.000 and 31.000 m3/s .
> Even though range is improved by higher sediment concentration some
> colleagues think over mooving bottom as a probable cause. Others believe
> in bed rugosity and/or bed fractured rocks. No problem with bad bins
> (between 0 and 1%). As a test, I suggested to field personnel to use
> once the user command WB1, trying to cross the bottom material obstacle.
> RD Instruments expert command description says that: sets profiling mode
> bandwidth (sampling rate).  Smaller bandwidths allow the ADCP to profile
> farther, but the standard deviation is increased by as much as 2.5
> times., even knowing that 300 and 600 kHz maximum ranges are 60 and 130
> meters, respctively. Standard deviation could be reduced increasing the
> depht cell size, averaging ensembles ou using multi pings ensembles. No
> improvment was achieved.
>
> If requested I can upload raw and configuration files to a FTP folder
> for analysis.
>
> Thank you,
>
> Pedro Moreira
> CPRM - Brazilian Geologic Service
> Hydrology Departament
> Rio de Janeiro - Brasil
> 55 21 2546-0352
>
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