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Worldwide Internal Soliton CriteriaGus Jeans OceanalysisMark Calverley Fugro GEOSWilliam Jeffery Fugro NPAChris Jackson Global Ocean AssociatesVasiliy Vlasenko University of PlymouthAl Osborne Nonlinear Waves Research Corporation
Oceanology International Conference14 March 2012
NONLINEAR WAVES RESEARCH CORPORATION
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Presentation Structure
Motivation
Data Sources
Project Team
NONLINEAR WAVES RESEARCH CORPORATION
Deliverables
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Soliton Impact
Copyright © 2010 Fugro GEOS
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Project Motivation
• Prediction
• Quantification
• Enhance soliton desk studies
• Enhance early warning system
• Clarify in-situ measurement recommendations
• Derive more information from satellite data
• Apply recent modelling advances
• OGP Metocean Brainstorming
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Levels of Interest
Interest Level Development Phase Reccommended Deliverables 1 Asset Appraisal Preliminary soliton activity desk study
GIS soliton atlas and Metocean strategy 2 Seismic Exploration Soliton quantification and predictability desk study 3 Exploration Drilling
Operations Soliton quantification and predictability desk study In-situ soliton analysis Rig operability desk study
4 Engineering Design In-situ soliton analysis Soliton Design Criteria
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Project Team Roles
Fugro GEOS Joint Industry Project ManagementIn-situ Measurement & Analysis
Fugro NPA Oil & Gas Satellite Database
Global Ocean Associates Internal Wave Atlas
University of Plymouth Internal Wave Modelling
Nonlinear Waves Research Soliton Theory & Analysis
Oceanalysis Analysis & Review
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro GEOS: Soliton Desk Study Andaman Sea
218 satellite images with 77 images subjected to detailed analysis
Propagation speed and direction calculated (1.7ms-1)
Generation zone identified
Confirmed need for a SEWS
Identified best locations for SEWS moorings
Goff et al (2008)
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro GEOS: Soliton Early Warning System
•Oceanor Wavescan Buoy•Iridium data transmission•TRDI 75kHz Longranger ADCP•Aanderaa DCS3900 •3 x Seabird SBE-37 CT Sensors
Thermocline
Jack Bates
Direction of soliton propagation
SEWS#1 SEWS#2
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro GEOS: Soliton Early Warning System
Rig tilt observed from Helideck as solitons passed through
NOTE: this was AFTER appropriate action taken
Did the SEWS avoid the previous fate -pushed off location up to 189m and a broken drill string?
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro GEOS: Soliton Analysis
0 m
250 m
-12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 (Hours)Current Velocity (m/s)
Northward Velocity (m/s)
Eastward Velocity (m/s)
Solitons observed at SEWS#2
30º C
0 m
250 m
18º C
-0.6 -0.4 -0.2 0 0.2 0.4 0.6
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro GEOS: Soliton Analysis
50
25
0
0 0.2 0.4 0.6 0.8 1.0 1.2
Frequency of solitons
Peak current speed (m/s)
No. of solitons
Peak soliton current speeds were predominantly higher at SEWS#1 than at SEWS#2 due to attenuation of energy over the distance travelled from soliton generation zone.
SEWS#1SEWS#2
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro GEOS: Soliton Analysis
2.0 m
0 mNovember December January February
Occurrence and magnitude of solitons relative to tide
Peak current speed (m/s)
Maximum soliton speed
Tidal range
1.0 ms-1
0 ms-1
SEWS#1SEWS#2
The number of solitons at SEWS#1 peaked 2-hours after High Water with solitons occurring at SEWS#2 9-hours after High Water.
As expected, solitons were more frequent with higher magnitude around spring tides.
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro NPA: Global Satellite Database
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro NPA: Sulu Sea
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Fugro NPA: South China Sea
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Global Ocean Associates: The Atlas
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Global Ocean Associates: New Sightings
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Global Ocean Associates: Empirical Model
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Global Ocean Associates: Empirical Model
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
University of Plymouth: A Generation Story
Jeans (1998) A Nonlinear Internal Tide on the Portuguese Shelf
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Sherwin, Vlasenko, Stashchuk, Jeans and Jones (2002). Along-Slope Generation as an Explanation for Some Unusually Large Internal Tides. Deep-Sea Research I, 49, 1787-1799.
University of Plymouth: Global Generation
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
WISC Tier One Workflow
Modelling
Satellite
GOA
Plymouth
Fugro NPA
Literature
Participants
Fugro GEOS
GIS Atlas
Fugro NPA
Fugro GEOS
Oceanalysis
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
WISC Tier One
Applications:
• Asset appraisal
• Exploration planning
• Seismic exploration
• Exploration drilling
Data Sources:
• Literature review
• Satellite data screening and analysis
• Simple internal wave generation models
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
WISC Tier One Global Deliverables
• GIS Atlas covering offshore oil and gas regions worldwide
• Stand alone ESRI readable product and shapefiles
• Satellite image footprints showing internal wave activity
• Regions of theoretical internal wave generation potential
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
WISC Tier One Focus Region Deliverables
• Representative set of satellite images illustrating key characteristics
• Identification of likely generation sites and propagation directions
• Engineering focussed description of soliton activity in the region
• Summary of measured soliton current speeds*
• Soliton predictability relative to time of local high water*
• Soliton predictability relative to spring-neaps cycle*
• Assessment of seasonal trends and correlation with stratification*
• Recommended metocean strategy including sampling intervals
• A list of references used in the literature review
* if available
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
WISC Tier One Global Region Definition
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
WISC Tier Two
Applications:
• Preliminary engineering
• Engineering design
Data Sources:
• In-situ measurement
• Three dimensional non-linear, non-hydrostatic modelling
• Nonlinear Fourier Analysis
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
x=250 m; y=1000 m
Grid in horizontal directions
Grid in vertical direction:z=10 m in upper 500 mz=50 m in the rest of water
x
y
MITgcm Modelling
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Nonlinear Fourier Analysis
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Oceanology International Conference 14 March 2012 Worldwide Internal Soliton Criteria
Summary
• Solitons represent a major hazard to offshore operations
• Impact remains incompletely understood in some regions
• World class project team assembled for WISC
• Tier One to provide global summary with detail in focus regions
• Overlay literature review, satellite data and generation model in GIS
• Tier Two to consider engineering design