Arctic Dredging Past, Challenges and Future
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1 Arctic Dredging Past, Challenges and Future
2 Agenda Introduction Past Challenges Developments Aquarius Oranje 2
3 Past Historic projects Beaufort Sea, Cutters, Hoppers, Trenching Pipe laying studies Newfoundland, Glory holes Russia, river maintenance Sakhalin shore approaches, sea bed preparation Caspian, island port construction Gogland, L1 summer broken ice 3
4
5 Beaufort Hoppers Vessels by Boka, Volker, Zanen, Issues Season Performance 5
6 Sailing and Dredging in ice 6
7 Dragram and wires in ice 7
8 Bun building Ice Management 8
9 Issues Class and season (extension) July / end Oct Preparations start Mar, min 40C Break up: floe ice incl MY ice Continue: to abt 10cm ice No open water 1 in 10 yrs Uptime, safe speed in ice (Numeral) Icebreaker Support; Alerting Technical; equipment; Winterization Crew; other 9
10 Class Notation
11
12 Season, Beaufort Experience Effective operating days 85% Limited due to limited icebreaking power Limited due to safety constraints by hull loads Effective sailing speed, worst yr 70% Circumnavigate dangerous ice Lack of power in new ice Reduced speed in transit No downtime due to arms wires in ice Ice thickness limit 10/20 cm new ice 12
13 Operating Season Hoppers Beaufort Sea Class CASPPR Proposed Class D, E Class A Class Class Class 6 All year
14 Beaufort Conditions, NRC CHC TR 57 Wave height Kopanoar 14
15 Beaufort % of ice cover Aug 13,
16 Sea ice chart, Aug 24,
17 FMI Thickness and Drift Chart
18 Performance Operational limits Speed in kt. More IM, Higher Class, Lower concentration Thickness in m
19 Hopper Dredge Design No ice class Stationary craft with subm fairleads Sufficient freeboard Bow reinforced Superdredge Ice class Shell strengthened Increased Midship Section Dragarm and wire protection More power Shelter Ductile materials Class 6, m3 19
20 Arctic hopper dredgers, OMAE 1994 Unit Cost, 20% lower for Class 6 Performance ratings 20
21 Pipelaying and trenching Design requirements Vessels Stationary Mobile Summer Large Hull Bow strengthening Large freeboard Hoist wire protection Enviro protection Good maneuverability Winter Strong winches, wires Wire protection Underwater fairleads Wire reinforcement Local strength Propulsion power Shelter Local strength Shelter 21
22 Trenching season limitations Summer storms effect surface trenchers 25% downtime Hopper dredge production loss < 10% Ice floes in summer Thickness of first year ice Drift and speed of ice Season length Summer start <2/10th ice Summer end < 15 cm ice Healy Rock dredging, Alaska Aug
23 Surface trenchers progress rates 23
24 Ice effects operations through: Station keeping / mooring in ice Wire exposure Pipeline stinger exposure Trenching may become critical in comparison to a possible layrate Ice management Ice alerts, ice monitoring 24
25 Caspian Sea, Kashagan Field D Island 8 cofferdams Ice ride up Ice in port 25
26 Monitoring: Satellite, Heli recce, IT06
27 Alerting, AKAC Inc IT 06
28 Ice Monitoring Developments 1. New/more Satellites: more, quicker, cheaper? 2. Enhance a. ice drift monitoring tools b. ice forecasting tool c. identification of different ice types 3. Provide high resolution localized ice charts 4. Enhance understanding of types & kinds of ice conditions Ice Parameters of Interest Timco 2007
29 Dutch ice developments Arctic Operating Handbook, MIP Determine Operations gaps Icing, season, environmental severity, rules, uptime, safety, risks, human capital Prepare suggestions for new Operating Guidelines for submission to ISO MIIP projects (Maritieme Innovatie Impuls Projecten) Remote Sensing in arctic waters Dredging and trenching in arctic waters Others 29
30 Future developments Baffin Bay Barents Sea Bay of Baydaradskaya Beaufort & Chukchi Sea Kara Sea Sea of Okhotsk Challenges Concepts Cost Feasibility Knowledge and tools Seasons and durations Systems Support and logistics Uptime 30
31 Beaufort: 2012/27 for DIAND, LTLC April 12 Conoco Phillips 3 yr study Evaluate commercial development of Amauligak Develop concepts, GBS, Floater, Transport, Soils, scouring, environment, construction 31
32 Questions? 32
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