Puget Sound Tow CTD chain TestJanuary 4, 2011
Participants:Scientist : Frank Henyey, Barry MaCaptain : Eric BogetEngineer : Tim McGinnis, Tim Wen, Nicolas Michel-HartSBE expert: Joel Reiter, Robin Clifford
TOWSBE Tow chain system with inductive SBE microCATS Steel armored cable (long-line fishing proof). Real time inductive queries Internal recording Adjustable sensor amount and depth Attachable Fairing system
Sea Cable150m
6-8SBE37IMPMicroCats
V-Fin Depressorw/Lower Electrode
Deck Unit
Deck Cable30m
R/V Robertson
A-Frame
Steel or Kevlar Tow Cable
Electronics Housing
Winch
LabView interface
Puget Sound Trial January 4, 2011
Sea Cable150m
6-8SBE37IMPMicroCats
V-Fin Depressorw/Lower Electrode
Deck Unit
Deck Cable30m
R/V Robertson
A-Frame
Steel or Kevlar Tow Cable
Electronics Housing
Winch
New clamp designSwing with flow
Fairing reduce drag and strumming
Electronic housing
SBE37IM x8
Depressor
80m Fairings
150 m armored coax sea-cable
UIMM
UIMMx1
15meter interval
January 4, 2011 TOWSBE Puget Sound Trial
8 SBE 37 IM sensors (C, T, P) with 150m armored cable SBE sampling interval 10s, query 1 period: dn20 /3min, query2: dn10/3min Towing speed 1~ 4 kts Upper and lower boundaries mark the instrument depth Black dots indicate near real-time data query during the Puget Sound Trial.
query 1 query 2
Detail Ocean Structure Reviewed
January 4, 2011 TOWSBE Puget Sound Trial
TOWSBE Puget Sound trial results New clamp designs ensured the micorCATs swing freely Armored sea cable has good inductive character for data transmission and
also prevent potential damage from long-line fishing. Ship speed over 4 kts affect inductive transmission. More query errors
occurred. Possible caused by the cable strumming due to the upper 70m without fairings during the Puget Sound trial.
SBE37 IM #1 and #2 (top two sensors ) have more query errors (cable strumming? loaner units? older IMM model? without pump?)
microCATs internal recordings data are good. High resolution downloaded after TOWSBE recovery
Little flow effect observed on the microCATs conductivity data (need to further verify).
LabView interface and Matlab near real-time processing are tested.
Data: SBE raw and Queriedhttp://kirin.apl.washington.edu/~barry/TOWSBE_0104_2011/data/Cable strumming videohttp://kirin.apl.washington.edu/~barry/TOWSBE_0104_2011/movie/Strumming0104.AVI
IWISE Field Program TOWSBE Spec 800m armored sea cable Fully faired ~ 40 microCATs sensors ~10 HOBO U10 loggers 3-4 kts towing speed High resolution T,C,P data internal recording Real time inductive query for assessing ocean condition