Mooring Sensor Network for Ocean Observatories: Continuous, Adaptive Profiling

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Mooring Sensor Network for Ocean Observatories
Continuous, Adaptive Profiling Development
Status Report

• Bruce M. Howe,
• Timothy McGinnis, Jason Gobat
• Applied Physics Laboratory, University of
  Washington

Roger Lukas, Univ Hawaii Emmanuel Boss, Univ
Maine Ocean Sciences Honolulu 24 February 2006
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Introduction

• A major effort and cost in the lifetime of an
  ocean observatory system will be in the sensor
  networks
• Here the sensor network infrastructure part
• Terminology
• Backbone infrastructure provides primary junction
  boxes/nodes
• Sensor networks (sensors/instruments sensor
  network infrastructure)
• A system integration problem many components

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Need for profiling moorings in ORION and ocean
observatories

• Reduce temporal and spatial aliasing in vertical
  sampling of the ocean, e.g., at tide and internal
  wave frequencies and space scales
• Deliberately intensive sampling of fine vertical
  structure Meddies/coherent eddies, biological
  thin layers, overflows, etc.
• Sampling of episodic or otherwise non-stationary
  flow
• Less expensive than many fixed instruments

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ExampleFully loaded mooring (RFA Daly et al.
2005)

• Two platforms for remote sensing and point
  instruments
• Two profilers
• Tomography source and receiver
• Bottom instrument suite
• Called for in many ORION RFA proposals (e.g.,
  Barth, Daly, Dever, Duda, Send, Worcester, )

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ALOHA-MARS Observatory Mooring

• Features
• Enables adaptive sampling
• Distributes power and communications capability
  throughout the water column
• ROV servicing
• Major Components
• Subsurface float at 165 m depth with sensor
  suite and junction box
• Mooring profiler with sensor suite that can
  dock for battery charging, continuous two-way
  communications
• Electro-optical-mechanical mooring cable
• Seafloor sensor suite and junction box
• Deployments
• June 2006 on Seahurst Observatory in Puget Sound,
  30 m depth
• 2007-2008 on MARS in Monterey Bay, 900 m depth

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FLOAT ASSEMBLY
Instrument Package
ADCP
Secondary node
Center Ti Post
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INSTRUMENT PACKAGE
BB2F
SIIM
CTDO2
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SWIVEL
Float Ti Post
Oil Reservoir
All Electrical
D Plate
EO Converter
Mooring Cable Termination
Electrical and Optical
Primary Winding
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MMP
Secondary Winding

• Concentrated on Inductive power coupler
• SK Engineering
• 3 mm gap
• Efficiency 65
• 200 W transfer
• 50 kHz
• MMP electronics includes 16 V battery charging

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Seafloor Secondary Node

• Stainless steel electronics case (on-hand, full
  ocean depth)
• PC-104 controller
• 400-48V dc (Vicor)
• MOSFET and deadface switches, software controlled
• Ground fault detection a la MARS
• 8-port 100baseT Ethernet switch
• Two guest ports

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Deck Frame
Requires DP ship Mooring winch Trawl winch Load
transfers Anchor first
Rail system moves float and mooring cable in
and out
Lays on fantail Bolts to 2-ft pattern
Float and Ti post locked during prep
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SensorsComponents
BB2F
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Schedule

• First test
• Seahurst, Puget Sound
• June 2006
• MARS Location
• Deploy summer 2007

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Other possible users

• Jack Barth upper ocean profiler
• Jeff Nystuen ocean ambient sound
• Peter Worcester vertical line array
• Ken Smith bottom rover
• Tom Sanford, Doug Luther HPIES
• John Horne fisheries sonar
• Lee Freitag acoustic modem/nav/comms

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AMM animation - docking