realtime sound velocity corrections -20 min (2)
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VIII Reunion del SEPHC12 y 13 de mayo de
2008Cartegena, Colombia
Derrick R. Peyton,MSc, MBA
P.Eng, CLS, IHO Cat Ad e ton brooke-ocean.com
Real-time Automated
Sound Velocity DataCorrections
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ODIM BROOKE OCEAN
Outer Beams have most error
Multibeam
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Variations in SV Data per l
1525 m/s 1532 m/s
2.5 hrs
Contract Hydrography: An Opportunity for Innovation in HydrographicSurveying,Jana L. DaSilvaFugro GeoServices, Inc., U.S. Hydrographic Conference 2001, May 22-24, 2001
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ODIM BROOKE
Horizontal Error of Plotted Soun
Point A Point BDistance = 0.7km or 11 minutes
a horizontal difference of 8m between a plotted soundingfrom the 75 deg beam angle of two points located 0.7kmapart.
The Effect of Refraction on Oblique Angles of Multibeam Echo-
Sounders due to Sound Speed changes through the WaterColumn, Desiree Batton, The Hydrographic Journal, No. 113, July,
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Spatial Resolution of SV D
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Depth Errors due to SV d
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Depth Errors due to SV d
1m
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NOAA Field Operatio
Currently, the NOAA hydrographic vessels are required to
insert the following sound speed uncertainty values inCARIS:
For ODIM MVP Casts: use 1 m/s for casts every 15min or less
For regular CTD Casts: use 4 m/s for casts every 4hours
MVPs would automatically have lower uncertaintydue to the fact that they are typically taken much
more frequently and therefore suffer less temporalincrease in uncertainty.
An Algorithm for Estimating the Sound Speed Component of Total
Depth Uncertainty, Gretchen Imahori and James Hiebert,Canadian Hydrographic Conference, Victoria, British Colombia,May 6-8, 2008
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ODIM BROOKE
Observing Water Column - CTD
Disadvantages- Low spatial resolution of SV data
- Labour intensive- Time Consuming- Costly ship time- Danger to Safety
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ODIM Moving Vessel Profiler (MVP)
ODIM MVPTM
(Moving VesselProfiler)
ODIM BROOKE
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Multi / Single Sensor Free Fall Fish
AML CTD, SV&P, Dissolved Oxygen Seabird 9Plus Wet Labs ECO Fluorometer, C-Star
Transmissometer Seapoint Turbidity Meter D&A OBS (turbidity) AML DO Micro Sensor Data Telemetry Module (DTM) Control
Module Satlantic ODIM LOPC (Laser Optical Plankton Counter)ODIM BROOKE
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Integrated Software System
Safety Depth
MVP Fish track
WinchControls
Navigation
ultibeam Bottom
Data output
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http://c/Documents%20and%20Settings/Administrator/My%20Documents/sephc/ODIM/flash-MVP-fish_profile%20(2).avi -
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ODIM MVPTM30ODIM MVPTM30-350
ODIM BROOKE
knots7 meters.8 minutes
6 knots145
meters10.8
minutes
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MVP 30 (A-FrameSheave)
US Naval OceanographicOffice
ODIM BROOKE
MVP 30 (A-FrameSheave)
NOAA, Office ofCoastal Survey
350
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ODIM MVPTM200
ODIM BROOKE
6 knots320 meters8.1 minutes
MVP200
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MVP 200
Royal Australian
Navy
MVP200
ODIM BROOKE
MVP 200
NOAA, Office of Coast
Survey
Free Fall Cone Penetrometer
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Free Fall Cone Penetrometer(FFCPT)
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ODIM MVP200 &
FFCPT(Free Fall ConePenetrometer)
Defense Research &Development Canada
FFCPT
ODIM BROOKE
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MVP30
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MVP 300SeismicApplications
Fugro Geo Atlantic
MVP300
ODIM BROOKE
MVP 300
University of Hawaii
M l i S F F ll Fi h
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Multi Sensor Free Fall Fish
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ODIM MVPTM800
ODIM BROOKE
6 knots2100 meters73 minutes
MVP80
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MVP 800Naval & OceanographicApplications
British Admiralty HMS Scott
ODIM BROOKE
MVP800
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ODIM LOPC(Laser Optic Plankton Counter)
ODIM BROOKE
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ODIM MVPTM200 LOPC
ODIM BROOKE
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www.brooke-ocean.com
www.odim.com