A new Norwegian icegoing research vessel

A new Norwegian icegoing
research vessel
Hans Petter Knudsen, Per W. Nieuwejaar
and Einar Osland
Institute of Marine Research, Bergen
Project goal
• To develop a proposal for a multipurpose
icegoing RV to replace ”Lance” and
”Jan Mayen”
Proposed renewal plan
for Norwegian RVs,
dated March 2006
Background
Proposal for icegoing RV,
dated June 2007
Feasibility study funded,
November 2007
Proposed vessel
LOA: 92.8m, LPP: 77.6m, Beam: 19.0m, Draught: 7.2m
Project plan
• 2008:
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Vessel design, model testing and
development of tender documents
Fall 2009: Tendering and contract
negotiations
Fall 2009: Signing ship building contract
End of 2011: Vessel delivery
Spring 2012: Setting to work
Summer 2012: First regular science cruise
Vessel concept
• Multifunctional
(biology, oceanography, geology)
• Ice breaking capabilities (POLAR 10)
• Helicopter carrier
• Logistics vessel
• Student training
• Long endurance
• Clean ship
Hull and propulsion
• DNV Polar 10 or Polar 10 Icebreaker
(POLAR 10 definition: Vessels intended for ice
breaking, built for another main purpose. Ice
conditions: Winter ice with multi-year ice-floes and
glacial ice inclusions. Accidental ramming. Figures
indicate nominal ice thickness in dm.)
• Propulsion system: Diesel-electric machinery (AC)
and ”Z-drive” propulsors. Two tunnel thrusters in the
bow area for DP operations.
Scientific sampling areas
Biology
• One set of trawl winches and double set
of trawl doors (demersal and pelagic)
• Ice gallows integrated in the A-frame for
trawling in ice waters
• Multifrequency EK 60 echosounder
mounted in drop keel
• Different nets for plankton sampling
• Benthos sampling using grabs over the
side
Clean ship
• No discharge of any kind on station in
ice covered waters
• Using gas generator for electrical power
production
• All water discharge to separate storage
tanks
• Means no contamination of any water or
air samples
Design challenges
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Radiated noise
Bubble sweep down
Monpool design
Hull mounted instruments
Cold weather conditions
Radiated noise
• The vessel will not be designed to fully meet
the ICES 209 recommendations for radiated
noise since stock assessment is not the
primary function for the vessel
• Every effort will be made to reduce radiated
noise and vibrations to create the best
possible working conditions for instruments
and personell
Bubble sweep down
• Air bubbles under the hull is a major
challenge for all hydroacoustical equipment
on board
• Two drop keels will ensure good working
conditions for fisheries acoustics and sea
current measurements
• The main concern is the hull mounted
multibeam echosounders and the sub bottom
profiler equipment. The plan is to lower the
”skeg” under the hull to get the transducers
below the main bubble stream
The drop keel position the transducers below the layer of aerated water
3 metres
below
the hull
ISOM 2006 Galway
Air bubble damping and
blocking
Moonpool design
• Moonpool to be used in ice covered waters to avoid
exposure to outside air and ice floes
• Must have a hatch in the bottom to avoid filling the
moonpool with ice
• Very high upward pressure when ice floes passes under
the moonpool hatch creates a risk of bending/braking the hatch
Hull mounted instruments
• Equipment: Drop keels, Multibeam echo
sounder systems and Sub bottom
profiler
• Bottom of hull exposed to large upward
forces when breaking ice
• Drifting ice under the hull will represent
an upward force and will also ”scratch”
the hull when passing under
Cold weather conditions
Cold weather and icing conditions
can create a number of technical
and operatioinal challenges.
Specially for delicate instruments!
Norwegian Defence
Research Establishment
Questions?