tfh berlin deployment technologies of seafloor observatories hans w. gerber dept. mechanical...
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TFH Berlin
Deployment technologies of seafloor observatories
Hans W. GerberDept. Mechanical Engineering
TFH Berlin, University of Applied Sciences, Germany
feasible and reasonable
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MARINE SCIENCES MARINE TECHNOLOGY
OCEANOGRAPHY ENGINEERING SCIENCES
EQUIPMENT – PROCEDURES - DESIGNS
MAN AT SEAROV / AUV
SUBMERSIBLES AND - … SYSTEMS
EXPLORATION EXPLOITATION AND PROTECTION
OBSERVATION MEASUREMENT
INSPECTIONMAINTENANCE
REPAIR
Technology at sea
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• Arctic - water exiting into the Atlantic ocean • Norwegian margin - slope instabilities - slides • North of the Faroes oceanic fluxes of heat, salt …. • Porcupine Seabight/Abyssal Plain bio-geochemical flux, fisheries and oil-gas exploration• Azores Mid-Atlantic Ridge habitats with hydrothermal vents and sea floor morphology - crust spreading
• Gulf of Cadiz - Iberian margin. complexity with the junction of the Eurasian and African plates • Ligurian Sea Existing cables installed for the ANTARES neutrino detector experiment • Eastern Sicily near Etna, multidisciplinary observatory recently completed its first mission - existing
cable• Hellenic Area characterized by significant seismicity, special habitats in deep basins• Black Sea anoxic conditions in the deep, invasive species and high sediment loads
Proposed deep sea observatories
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MODUS
Bottom Station
Moored Buoy for Near-Real-Time Communication
Combined systems: mooring and observatory
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0
500
1000
1500
2000
2500
3000
0 45 90 135 180 225 270 315 360
Time [d]
ma
ss [k
g]
Data link related to the amount storage, nrtcs, rtcs, cable (band width)
BENTHICSTATIONand/or
MOORING
LANDER
RO
V
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A-Frame - Ship motion and collision force during operation
Wind ForceWave Slam
Current induced DragWave particle drag; Intertial Force
Umbilical Slack cond.Heave DragInertial force
UmbilicalAdded mass
Heave,Roll, ...
Impact forces, DeploymentRecovery docking
system definition
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7From concept to operation
Interventionat 4000 meter
Concept
Design
Analysis
Manufac. + Tests
operation
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horizontal
CFD Simulation
deployment
recovery
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9CAD, FEM, CFD, RPT -> Product
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10Environmental conditions
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11MABEL - Multidisciplinary Antarctic BEnthic Laboratory
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12BIODEEP
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13aboard
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14Flow around an observatory: velocity magnitude
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15Observatory with standard interface and open frame
Robust frame for long term operation and heavy equipment
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Satellite Node(host)
Gateway Station
SatelliteLink
Acoustic Links
Sea floor
On-shore Networks (Internet)BUOY
Sea surface
Satellite Node(host)
c
GEOSTAR as gateway stationplus
satellites (incl. most demanding sensors)
6-8 month experiment NW of the Marsili volcanic seamount at 3260 m w.d.
ORION
ORION: Networking
Satellite Node(host)
Gateway Station
SatelliteLink
Acoustic Links
Sea floor
On-shore Networks (Internet)BUOY
Sea surface
Satellite Node(host)
c
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18Latch Device
TopofBS
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19Intervention systems
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Operation viaOperation via
AUVAUV((LLaunch aunch AAnd nd
RRecovery ecovery SSystem)ystem)
ROVROV(A-Frame)(A-Frame)
Cable-Cable-systemsystem(A-Frame)(A-Frame)
Operation Operation depth 4000 depth 4000
m?m?few availablefew available some some
availableavailablesome some
availableavailable
ultimate ultimate payloadpayload <10 KN<10 KN <10 KN<10 KN ~30 KN~30 KN
Handling Handling PeoplePeople >=3>=3 >=3>=3 22
Duration of Duration of Underwater Underwater OperationOperation
<= 48h<= 48h TheoreticTheoretical infiniteal infinite
TheoreticTheoretical infiniteal infinite
Sea State Sea State limitationslimitations
DuringDuringLaunch & Launch & RecoveryRecovery
During During Launch &Launch &RecoveryRecovery
During During whole whole Oper.Oper.
Different field for operation
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21Cable connected systems like MODUS
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22Cable connected systems like MODUS
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23End