Presentation
Tarsiut Caissons – Bathymetric Surveys for ConocoPhillips 14 August to 03 September 2013 Bruce Calderbank
rpsgroup.com/canada
CONTENTS • • • • • • • • • • • • •
A BRIEF HISTORY (SEE SEPARATE SLIDE SHOW) SAFETY TUKTOYAKTUK APPROACHES AND SET DOWN AREA THETIS BAY CAISSON STORAGE 2013 SURVEY TASK OVERVIEW SURVEY OPERATIONS MODIFICATIONS TO SCOPE OF WORK SURVEY TIMING ANALYSIS TUKTOYAKTUK SET DOWN AREA – RESULTS TUKTOYAKTUK APPROACHES – RESULTS THETIS BAY CAISSON STORAGE – RESULTS CONCLUSIONS THANKS
rpsgroup.com/canada
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A BRIEF HISTORY • • • • • • •
JUNE 1944 – MULBERRY HARBOURS A AND B JAN TO JUN 1981 – FOUR (4) CAISSONS BUILT IN VANCOUVER JUL TO AUG 1981 – TRANSPORTED ON SUBMERSIBLE BARGE SEP TO OCT 1981 – COMPLETED INSTALLATION ON BERM OCT 1981 TO OCT 1982 – DRILLING OPERATIONS OCT 1982 TO SUMMER 1983 – ICE TEST PLATFORM JUL TO AUG 1984 – DECOMMISSIONED AND STORED AT THETIS BAY, HERSCHEL ISLAND • 2001, 2007 AND 2015 – REFLOATED AND REPOSITIONED • AUG TO SEP 2013 – BATHYMETRIC AND PRE-SALVAGE SURVEYS
rpsgroup.com/canada
3
SAFETY • THERE WERE NO PERSONAL INJURY OR MATERIAL DAMAGE INCIDENTS DURING THE COURSE OF THE WORK. • PROJECT BRIEFINGS ONSHORE AT START UP IN INUVIK, AND FOR NTCL SUPPORT TUG CREW AT THETIS BAY. • SURVEY LAUNCH INSPECTION IN INUVIK CARRIED OUT BY NAV QC. • VESSEL INDUCTION ON SURVEY LAUNCH AND SUPPORT TUG FOR SURVEY PERSONNEL. • RESPONSE VESSEL CALL OUT TEST IN TUKTOYAKTUK.
rpsgroup.com/canada
4
TUKTOYAKTUK APPROACHES AND SET DOWN AREA • MOST OF THE SET DOWN AREA (IN RED BELOW) WAS IN AREA A
• TOW ROUTE TO WEST OF APPRAOCHES OFFERED BEST SUCCESS. rpsgroup.com/canada
5
THETIS BAY CAISSON STORAGE • PRECISE POINT POSITIONING WAS PERFORMED FOR HORIZONTAL OR VERTICAL CONTROL USING CAISSONS. • ORIGINAL LEASE AREA (IN RED BELOW) EXPANDED TO ACCOUNT FOR REFLOATING AND REPOSITIONING OF CAISSONS.
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2013 SURVEY TASK OVERVIEW • ON THE WEST SIDE OF TUKTOYAKTUK USE CAISSONS TO CREATE A BARRIER TO SLOW STORM CAUSED EROSION: IDENTIFY ANY POSSIBLE CONSTRAINTS AND HAZARDS FROM MAN-MADE, NATURAL AND GEOLOGICAL FEATURES WHICH MAY AFFECT THE CAISSON PLACEMENT OVER THE CHOSEN SET DOWN AREA. IDENTIFY A TOW ROUTE WEST OF THE TUKTOYAKTUK APPROACHES WITH A REDUCED WATER DEPTH OF GREATER THAN 4.2 METRES.
• AT THETIS BAY AS FOLLOWS: CARRY OUT A PRE-SALVAGE SURVEY TO MAP THE SEA BED AND DEBRIS AT THE LEASE SITE. POSITION AND CARRY OUT PICTORIAL INSPECTION OF CAISSONS. rpsgroup.com/canada
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SURVEY OPERATIONS • • • • • • • • •
14 AUG – INUKSHUK PEOPLE IN INUVIK 19 AUG – SURVEY LAUNCH DEPARTED INUVIK 21 AUG – MBES IN SET DOWN AREA – WOW 22 AUG – WOW; EXTRA LAND SURVEY 23 TO 25 AUG – MBES IN AREAS A AND B 26 TO 27 AUG – GRAB AND CORE SAMPLING 27 TO 28 AUG – SHORELINE TOPO SURVEY 29 AUG – DATA PROCESSING 30 AUG – TRANSFER TO NTCL SUPPORT TUG HENRY CHRISTOFFERSEN • 31 AUG TO 01 SEPT – MBES IN THETIS BAY • 02 T0 03 SEPT – DEMOB TO INUVIK
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MODIFICATONS TO SCOPE OF WORK • SHORE LINE TOPOGRAPHICAL SURVEY AND ASSOCIATED PHOTOGRAPHIC WORK CARRIED OUT ON 27 AND 28 AUGUST WHILST WAITING FOR ARRIVAL OF SUPPORT TUG. SURVEYED CONCRETE FORMS USED TO LIMIT SHORE EROSION, FROM FLAG POLE POINT TO SOUTH WEST. • GAS-FREE BARGE AND ZOOM BOOM WAS ADDED TO THE EQUIPMENT TAKEN TO THETIS BAY TO ALLOW THE SAFEST POSSIBLE ACCESS TO THE TOP OF THE CAISSONS FOR THE LAND SURVEY OPERATIONS TO POSITION THE CAISSONS. rpsgroup.com/canada
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SURVEY TIMING ANALYSIS • • • • •
PROJECT TOTAL = 20 DAYS OPERATIONAL TIME ALMOST EQUALED MOB/DEMOB TIME. WEATHER DOWNTIME = 17 HOURS AT TUKTOYAKTUK. SURVEY CREW WORKED A 12 HOUR DAY. NO DISPUTED TIME!
rpsgroup.com/canada
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TUKTOYAKTUK SET DOWN AREA – RESULTS • SET DOWN AREA – FINAL BATHYMETRY
rpsgroup.com/canada
11
TUKTOYAKTUK APPROACHES – RESULTS • POTENTIAL TOW ROUTE – FINAL BATHYMETRY
rpsgroup.com/canada
12
THETIS BAY CAISSON STORAGE – RESULTS • SOME SILTATION BUILD UP ON WEST AND NORTH SIDES, WITH DEEPER WATER ON EAST AND SOUTH SIDES. • WATER DEPTH 4.5 TO 11.0 METRES RELATIVE TO CHART DATUM. • 8 TARGEST FOUND IN SURVEY AREA WHICH APPEAR TO BE METAL OR OTHER DEBRIS. rpsgroup.com/canada
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CONCLUSIONS • THE OVERALL REQUIREMENTS OF THESE SURVEYS WERE ACHIEVED. • AT TUKTOYAKTUK, BASED ON THE MULTIBEAM ECHO SOUNDER AND SUB BOTTOM PROFILER DATA THE FOLLOWING CONCLUSIONS WERE MADE: THERE WAS A POSSIBILITY THE CAISSONS COULD HAVE BEEN USED IN SOME MANNER AS AN OFFSHORE BARRIER HOWEVER; A SHALLOW GRAVEL SPIT WAS EVIDENT RUNNING NORTH WEST FROM FLAGPOLE POINT ACROSS AREA A WHICH WOULD HAVE HAD TO BEEN DREDGED TO ALLOW ACCESS TO THE SET DOWN SITE. THROUGH THE TUKTOYAKTUK APPROACHES THERE WAS NO SUITABLE TOW ROUTE. • AT THETIS BAY THE PICTORIAL RECONNAISSANCE AND PRESALVAGE SURVEY WILL PROVE ESSENTIAL FOR THE FUTURE REMOVAL AND SALVAGE OPERATIONS. rpsgroup.com/canada
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THANKS • TO CONOCOPHILLIPS CANADA FOR ALLOWING THIS PRESENTATION TO BE PUBLISHED. • TO THE CANADIAN HYDROGRAPHIC SERVICE (CHS) FOR SHARING BATHYMETRIC DATA FOR THE TUKTOYAKTUK HARBOUR AND THE APPROACHES. [ALL CONOCOPHILLIPS CANADA SURVEY DATA WAS SHARED WITH CHS.] • TO INUKSHUK GEOMATICS AND SEAFORTH ENGINEERING FOR THEIR COOPERATION. • TO THE AUDIENCE.
• MERRY CHRISTMAS • HAPPY NEW YEAR. rpsgroup.com/canada
15
rpsgroup.com/canada
CONTENTS • • • • • • • • • • • • •
A BRIEF HISTORY (SEE SEPARATE SLIDE SHOW) SAFETY TUKTOYAKTUK APPROACHES AND SET DOWN AREA THETIS BAY CAISSON STORAGE 2013 SURVEY TASK OVERVIEW SURVEY OPERATIONS MODIFICATIONS TO SCOPE OF WORK SURVEY TIMING ANALYSIS TUKTOYAKTUK SET DOWN AREA – RESULTS TUKTOYAKTUK APPROACHES – RESULTS THETIS BAY CAISSON STORAGE – RESULTS CONCLUSIONS THANKS
rpsgroup.com/canada
2
A BRIEF HISTORY • • • • • • •
JUNE 1944 – MULBERRY HARBOURS A AND B JAN TO JUN 1981 – FOUR (4) CAISSONS BUILT IN VANCOUVER JUL TO AUG 1981 – TRANSPORTED ON SUBMERSIBLE BARGE SEP TO OCT 1981 – COMPLETED INSTALLATION ON BERM OCT 1981 TO OCT 1982 – DRILLING OPERATIONS OCT 1982 TO SUMMER 1983 – ICE TEST PLATFORM JUL TO AUG 1984 – DECOMMISSIONED AND STORED AT THETIS BAY, HERSCHEL ISLAND • 2001, 2007 AND 2015 – REFLOATED AND REPOSITIONED • AUG TO SEP 2013 – BATHYMETRIC AND PRE-SALVAGE SURVEYS
rpsgroup.com/canada
3
SAFETY • THERE WERE NO PERSONAL INJURY OR MATERIAL DAMAGE INCIDENTS DURING THE COURSE OF THE WORK. • PROJECT BRIEFINGS ONSHORE AT START UP IN INUVIK, AND FOR NTCL SUPPORT TUG CREW AT THETIS BAY. • SURVEY LAUNCH INSPECTION IN INUVIK CARRIED OUT BY NAV QC. • VESSEL INDUCTION ON SURVEY LAUNCH AND SUPPORT TUG FOR SURVEY PERSONNEL. • RESPONSE VESSEL CALL OUT TEST IN TUKTOYAKTUK.
rpsgroup.com/canada
4
TUKTOYAKTUK APPROACHES AND SET DOWN AREA • MOST OF THE SET DOWN AREA (IN RED BELOW) WAS IN AREA A
• TOW ROUTE TO WEST OF APPRAOCHES OFFERED BEST SUCCESS. rpsgroup.com/canada
5
THETIS BAY CAISSON STORAGE • PRECISE POINT POSITIONING WAS PERFORMED FOR HORIZONTAL OR VERTICAL CONTROL USING CAISSONS. • ORIGINAL LEASE AREA (IN RED BELOW) EXPANDED TO ACCOUNT FOR REFLOATING AND REPOSITIONING OF CAISSONS.
rpsgroup.com/canada
6
2013 SURVEY TASK OVERVIEW • ON THE WEST SIDE OF TUKTOYAKTUK USE CAISSONS TO CREATE A BARRIER TO SLOW STORM CAUSED EROSION: IDENTIFY ANY POSSIBLE CONSTRAINTS AND HAZARDS FROM MAN-MADE, NATURAL AND GEOLOGICAL FEATURES WHICH MAY AFFECT THE CAISSON PLACEMENT OVER THE CHOSEN SET DOWN AREA. IDENTIFY A TOW ROUTE WEST OF THE TUKTOYAKTUK APPROACHES WITH A REDUCED WATER DEPTH OF GREATER THAN 4.2 METRES.
• AT THETIS BAY AS FOLLOWS: CARRY OUT A PRE-SALVAGE SURVEY TO MAP THE SEA BED AND DEBRIS AT THE LEASE SITE. POSITION AND CARRY OUT PICTORIAL INSPECTION OF CAISSONS. rpsgroup.com/canada
7
SURVEY OPERATIONS • • • • • • • • •
14 AUG – INUKSHUK PEOPLE IN INUVIK 19 AUG – SURVEY LAUNCH DEPARTED INUVIK 21 AUG – MBES IN SET DOWN AREA – WOW 22 AUG – WOW; EXTRA LAND SURVEY 23 TO 25 AUG – MBES IN AREAS A AND B 26 TO 27 AUG – GRAB AND CORE SAMPLING 27 TO 28 AUG – SHORELINE TOPO SURVEY 29 AUG – DATA PROCESSING 30 AUG – TRANSFER TO NTCL SUPPORT TUG HENRY CHRISTOFFERSEN • 31 AUG TO 01 SEPT – MBES IN THETIS BAY • 02 T0 03 SEPT – DEMOB TO INUVIK
rpsgroup.com/canada
8
MODIFICATONS TO SCOPE OF WORK • SHORE LINE TOPOGRAPHICAL SURVEY AND ASSOCIATED PHOTOGRAPHIC WORK CARRIED OUT ON 27 AND 28 AUGUST WHILST WAITING FOR ARRIVAL OF SUPPORT TUG. SURVEYED CONCRETE FORMS USED TO LIMIT SHORE EROSION, FROM FLAG POLE POINT TO SOUTH WEST. • GAS-FREE BARGE AND ZOOM BOOM WAS ADDED TO THE EQUIPMENT TAKEN TO THETIS BAY TO ALLOW THE SAFEST POSSIBLE ACCESS TO THE TOP OF THE CAISSONS FOR THE LAND SURVEY OPERATIONS TO POSITION THE CAISSONS. rpsgroup.com/canada
9
SURVEY TIMING ANALYSIS • • • • •
PROJECT TOTAL = 20 DAYS OPERATIONAL TIME ALMOST EQUALED MOB/DEMOB TIME. WEATHER DOWNTIME = 17 HOURS AT TUKTOYAKTUK. SURVEY CREW WORKED A 12 HOUR DAY. NO DISPUTED TIME!
rpsgroup.com/canada
10
TUKTOYAKTUK SET DOWN AREA – RESULTS • SET DOWN AREA – FINAL BATHYMETRY
rpsgroup.com/canada
11
TUKTOYAKTUK APPROACHES – RESULTS • POTENTIAL TOW ROUTE – FINAL BATHYMETRY
rpsgroup.com/canada
12
THETIS BAY CAISSON STORAGE – RESULTS • SOME SILTATION BUILD UP ON WEST AND NORTH SIDES, WITH DEEPER WATER ON EAST AND SOUTH SIDES. • WATER DEPTH 4.5 TO 11.0 METRES RELATIVE TO CHART DATUM. • 8 TARGEST FOUND IN SURVEY AREA WHICH APPEAR TO BE METAL OR OTHER DEBRIS. rpsgroup.com/canada
13
CONCLUSIONS • THE OVERALL REQUIREMENTS OF THESE SURVEYS WERE ACHIEVED. • AT TUKTOYAKTUK, BASED ON THE MULTIBEAM ECHO SOUNDER AND SUB BOTTOM PROFILER DATA THE FOLLOWING CONCLUSIONS WERE MADE: THERE WAS A POSSIBILITY THE CAISSONS COULD HAVE BEEN USED IN SOME MANNER AS AN OFFSHORE BARRIER HOWEVER; A SHALLOW GRAVEL SPIT WAS EVIDENT RUNNING NORTH WEST FROM FLAGPOLE POINT ACROSS AREA A WHICH WOULD HAVE HAD TO BEEN DREDGED TO ALLOW ACCESS TO THE SET DOWN SITE. THROUGH THE TUKTOYAKTUK APPROACHES THERE WAS NO SUITABLE TOW ROUTE. • AT THETIS BAY THE PICTORIAL RECONNAISSANCE AND PRESALVAGE SURVEY WILL PROVE ESSENTIAL FOR THE FUTURE REMOVAL AND SALVAGE OPERATIONS. rpsgroup.com/canada
14
THANKS • TO CONOCOPHILLIPS CANADA FOR ALLOWING THIS PRESENTATION TO BE PUBLISHED. • TO THE CANADIAN HYDROGRAPHIC SERVICE (CHS) FOR SHARING BATHYMETRIC DATA FOR THE TUKTOYAKTUK HARBOUR AND THE APPROACHES. [ALL CONOCOPHILLIPS CANADA SURVEY DATA WAS SHARED WITH CHS.] • TO INUKSHUK GEOMATICS AND SEAFORTH ENGINEERING FOR THEIR COOPERATION. • TO THE AUDIENCE.
• MERRY CHRISTMAS • HAPPY NEW YEAR. rpsgroup.com/canada
15
