[Acoustics] ADCP echo intensity and SSC correlation

[Marinna A Martini]

Hi Niel,

The answer is... it depends.

Yes, you can get an indication of the absence or presence of turbidity 
using the ADCP backscatter, but beyond that, it might be misleading, 
because the signal return depends on grain size.  I.e. a 1200 kHz doppler 
signal will "see" only a certain range of grain size.  So you have to know 
a bit about the sediment you are chasing.
I have heard good things about the Sediview package for teasing more 
specific information out of the backscatter by using samples... many 
samples.
Folks in the know about Sediview lurk on this list, so I'll let them 
answer....

But, if you put in the time and care, you can get some good information 
out of it.

Cheers,
Marinna

-------- "Be seeing you..."  - The Prisoner ----------------------------
Marinna Martini,  Electronics/Ocean Engineer
USGS Woods Hole Science Center, MA
mmartini at usgs.gov, (508) 457-2326, FAX (508) 457-2313


acoustics-bounces at simon.er.usgs.gov wrote on 09/12/2006 03:51:28 AM:

> 
> Hi all,
> 
> I am looking at linking ADCP echo intensities to turbidity events in 
bays.I
> realize that I would need in situ water samples to do calibrate the ADCP
> data,but I think as long as the echo intensity is representative of 
> where there
> is plenty of SSC in the bay ,same as where there is little SSC.I would 
like to
> know if there 
> are any special precausions I would need to follow when analyzing the 
echo
> intensity data?
> 
> Thank you for your time
> 
> Niel Engelbrecht
> 
> 
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