[Acoustics] mode use for slow vel

[Pilling,Roger [Yel]]

Water mode 5 or 11 should work well. We have done a few comparisons with
mode 5 and 12 SB, and in low velocities (0.3-0.5 m/s, or about 1 ft/s)
and we found mode 12SB results in  from 5-8% less discharge compared to
mode 5. Why this happens no one seems to know.
 
Roger Pilling
Water Survey of Canada
Fort Simpson, NWT

-----Original Message-----
From: acoustics-bounces at simon.er.usgs.gov
[mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of Randy A
Samuelson
Sent: Wednesday, September 13, 2006 12:33 PM
To: Huston, Dave
Cc: acoustics-bounces at simon.er.usgs.gov; acoustics at simon.er.usgs.gov
Subject: RE: [Acoustics] mode use for slow vel



WM 11 should work great if the water is calm (no chop) and there is no
significant shear in the column.  I've been using it with good results
at sites with similar depths with velocities up to 1.2 ft/s.   

Randy A Samuelson

US Geological Survey                 
8027 Exchange Dr                         512-927-3539 (work)
Austin, TX 78754                            512-423-3523 (cell)
http://tx.usgs.gov





"Huston, Dave" <dwhuston at water.ca.gov> 
Sent by: acoustics-bounces at simon.er.usgs.gov 


09/13/2006 12:55 PM 


To
<acoustics at simon.er.usgs.gov> 

cc

Subject
RE: [Acoustics] mode use for slow vel

	




That or WM11 a) if you have it and b) if you keep your boat speed down. 
  
*********************************** 
Dave Huston, P.E. 
Dept. of Water Resources 
Central District 
901 P Street 
Sacramento, CA. 95814 
(916) 651-0762 (OFFICE) 
(916) 651-0766 (FAX) 
*********************************** 
  


  _____  

From: acoustics-bounces at simon.er.usgs.gov
[mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of Terry A.
Kenney
Sent: Wednesday, September 13, 2006 10:40 AM
To: acoustics at simon.er.usgs.gov
Subject: RE: [Acoustics] mode use for slow vel

These conditions are ideal for water mode 5. 
  
********************************** 
Terry A. Kenney, Hydrologist
U.S. Geological Survey
Utah Water Science Center
2329 Orton Circle
Salt Lake City, UT  84119-2047
(801)908-5046 voice 
  
 <http://ut.water.usgs.gov/> http://ut.water.usgs.gov 

  _____  


From: acoustics-bounces at simon.er.usgs.gov
[mailto:acoustics-bounces at simon.er.usgs.gov] On Behalf Of David M
Hernandez
Sent: Wednesday, September 13, 2006 10:50 AM
To: acoustics at simon.er.usgs.gov
Subject: [Acoustics] mode use for slow vel 
  

To all, The conditions are: Channel width 100 to 200 ft. Depth 3 to 7
ft. velocity < .1ft/sec. Used Rio 1200khz water mode 12sb bottom mode 5.
Not sure it was the best combination for those conditions, does anyone
have similar conditions? Which mode combinations would work best for
collecting repeatable transects?
Dave_______________________________________________
Acoustics mailing list
Acoustics at simon.er.usgs.gov
http://simon.er.usgs.gov/mailman/listinfo/acoustics



-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://simon.er.usgs.gov/pipermail/acoustics/attachments/20060913/f1f8bbfa/attachment.html