Mooring Sensor Network for Ocean Observatories: Continuous, Adaptive Profiling

– Development Status Report –

Bruce M. Howe,

Timothy McGinnis, Jason GobatApplied Physics Laboratory, University of Washington

Roger Lukas, Univ HawaiiEmmanuel Boss, Univ Maine

Ocean SciencesHonolulu

24 February 2006

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

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

Example:Fully 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, …)

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

FLOATASSEMBLY

InstrumentPackageADCP

Center Ti Post

Secondary node

INSTRUMENT PACKAGE

SIIM

BB2F

CTDO2

SWIVEL Float Ti Post

Oil Reservoir

“D” Plate

Mooring CableTermination

Primary Winding

All Electrical

EO Converter

Electrical and Optical

MMP

SecondaryWinding• Concentrated on

Inductive power coupler– S&K Engineering– ~3 mm gap– Efficiency ~65%– 200 W transfer– 50 kHz– MMP electronics

includes 16 V battery charging

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 portsRemovable ballast

ROV-mateable connectors Electronics

ROV “fork” slots

Fiberglass grating

Deck Frame

Float and Ti post locked during prep

Rail system – moves float and mooring cable in and out

Lays on fantailBolts to 2-ft pattern

Requires DP shipMooring winchTrawl winchLoad transfersAnchor first

SensorsComponents

BB2F

RS-232-Ethernet

CTDO2

Acceleration, attitude

ACMVideo-cam

ADCP 150 kHz

Connectors

-1300

570,000 571,000 572,000 573,000 574,000 575,000 576,000 577,000

4,06

0,00

04,

061,

000

4,06

2,00

04,

063,

000

4,06

4,00

0

122°13'0"W 122°12'30"W 122°12'0"W 122°11'30"W 122°11'0"W 122°10'30"W 122°10'0"W 122°9'30"W 122°9'0"W 122°8'30"W 122°8'0"W

36°4

1'0"

N36

°42'

0"N

36°4

3'0"

N

³

200 0 200 400 600 800Meters

1:20,000

Datum: WGS1984Grid: UTM Zone 10NSurvey Date: October 22, 2004

MARS ALOHA Mooring Location

MARS Node

HydroGeo Borehole

Seismo Borehole

MOBB

Proposed Aloha Site

UTM: 574520E, 4061663N

36 41’ 51.742”N 122 9’ 56.775”W

Schedule

• First test– Seahurst,

Puget Sound– June 2006

• MARS Location– Deploy

summer 2007

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

AMM animation - docking