Kaj Riska

Kaj Antero Riska (born January 25, 1953, Helsinki, Finland) is a naval architect and engineer with expertise in ice and arctic technology. He has written various publications about ice-going ships and icebreaker design, ice loads and ice management for arctic offshore floating platforms. He worked at Total S.A. as Senior Ice Engineer. He received the 2019 POAC Founders Lifetime Achievement Award.

Education and career Kaj Riska graduated from the Helsinki University of Technology (TTK) () in Naval Architecture as M.Sc. in 1978 and D.Sc. in 1988. He worked at the Technical Research Centre of Finland from 1977 to 1988 as the group leader for Arctic Marine Technology. From 1989 to 1991 he was a senior researcher for the Academy of Finland. From 1992 to 1995 he was the director of Arctic Offshore Research Centre and from 1995 to 2005 the professor of Arctic Marine Technology at the Helsinki University of Technology.

Since 2005 he has been a partner of the company ILS Oy and since 2006 Professor at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway. He and his Ph.D. students were investigating the models to describe the ice action on ships and their application in various ship design aspects.Design of Ice Breaking Ships

Exams Kaj Riska passed his student exam (upper secondary school) at Helsingin Yhtenäiskoulu in May 1972. He received his Master of Science degree in naval architecture in June 1978 and his Doctor in Technology degree in September 1988, both issued by the Helsinki University of Technology.

Previous professional experience

From 1974 and up to 2005, Kaj Riska worked at many academic institutions as researcher or professor. These experiences can be summarized as follow: TKK, Laboratory of Mechanics: assistant to professor. Technical Research Centre of Finland, Ship Laboratory: research assistant, research scientist, senior research scientist and head of division. TKK, Laboratory of Naval Architecture and Marine Engineering: senior research scientist. Academy of Sciences in Finland: senior fellow. TKK, Arctic Offshore Research Centre: Director. TKK, Ship Laboratory: acting professor and Professor in Arctic Marine Technology. Also, he has been giving lectures at TKK, Laboratory of Naval Architecture and Marine Engineering in ship vibrations, winter navigation and marine technology. He worked as Project Manager from 1989 to 1992 in the same laboratory.

In 2005, Kaj Riska joined ILS Ltd as Senior Naval Architect and partner. ILS Lts is an independent, private owned consulting and engineering company, specialized in ship design and especially in ship project evaluation and basic design. In 2012, Riska left ILS Ltd to join Total S.A.

Present activities Since 2012, Kaj Riska is working at the supermajor Total in ParisLinked In as Senior ice engineer. Total is positioned on two large-scale projects in the Arctic: Shtokman and Yamal LNG, both in the Russian Arctic Shelf. Riska is Professor II at the University of Science and Technology of Trondheim, Norway, since 2006

Influence

Kaj Riska is a key person in the Arctic Technology area. His works are key references for ISO standards (ISO 19906) and Rules of Classification of ice-going ships. He is an active member of many organizations.

Scientific activities

PolarTech (member of the standing committee since 1991) Conference of Port and Ocean Engineering under Arctic Conditions (POAC) (member of the international committee since 1990, chairman 1998-2000) Society of Structural Mechanics (secretary 1984-85, chairman 1996-2001) The Association of Finnish Metal Industries, Shipbuilding group, R & D committee (member and secretary, 1985-1998) 11th and 12th International Ship & Offshore Structures Congress (ISSC) (member of committee I.2 1988-1994, chairman of ice-structure interaction committee 1994-2000) 20th International Towing Tank Conference (ITTC) (member of performance in ice-covered waters committee 1990-1993, chairman 1993-1996) The Board of the Maritime Institute of Finland (member 1994-1999) The Finnish Polar Council (member 1994-1999) International Journal of Polar Engineering and Offshore Mechanics (associate-editor 1995-1998) Oceanic Engineering International - journal (associate-editor 1996-1999) Specific Committee for European Union scientific programme MAST (Marine Science and Technology) (national delegate 1997-1998) European Association of Universities in Marine Technology and Related Sciences (member of the executive committee 2001-2004) European Shipbuilders Association (CESA), the R&D working group of CESA (COREDES) (scientific adviser 2003-2005) The Maritime Institute of Finland (chairman of the board 2004) Expert Pilot Panel of IMO on developing the GBS (member 2007-2008)

Partial list of project management

Expert for the Finnish Transport Safety Agency in developing the ice class correction factors for EEDI at IMO/MEPC, since 2009 Expert in developing the Finnish-Swedish ice class rules for the Finnish and Swedish Maritime Administrations, since 1995 Updating the performance requirements of the Finnish-Swedish ice class rules, technical background, The Finnish Maritime Administration, since 1993 Coordinator of the EC-funded project SAFEICE (Increasing the Safety of Icebound Shipping), 2004 – 2005 Expert for the Finnish Maritime Administration in the EC-funded PHARE-project Strengthening Enforcement of Maritime Safety, a twinning project between Estonia and Finland, 2003 - 2005 Coordinator of the EC-funded project IRIS (Ice ridging information for decision making in shipping operations), 2003 – 2005 Member of the ad hoc IACS working group to develop the harmonized polar rules, 1993 – 2001 Evaluation of design ice loads of a FPSU operating in the Bohai Bay, 1997-1999, The China Offshore Oil Bohai Corporation and the Finnish Ministry of Trade and Industry. Coordinator of the EC-funded MAST III project ICE STATE concerned with modelling and remote sensing of the ice cover, 1996-1999 Safety of RORO vessels, ship collision risks in the Finnish waters and external collision dynamics, 1996. International joint industry project coordinated by Det norske Veritas. Ice interaction with the Bohai Bay production station, 1992, China Offshore Oil Design and Engineering Corporation. Model tests to design the Finnish multipurpose icebreaker, 1991–92, The Board of Navigation and Finnyards. Ice expedition to the Pechora Sea, winter 1992. Offshore Industry Group in Finland. Ice expedition to the Okhotsk Sea, winter 1990 and 1991. Offshore Industry Group in Finland. Ice load evaluations for the various production platform concepts for the Shtockmanovskoye gas field, 1990, Wärtsilä Project Export, 2000, Fortum. Ice load on ships in realistic ice conditions, 1989 - 1993, jointly with National Research Council of Canada. The Joint Research Project Arrangement No. 5 (JRPA V) between Finland and Canada. Theoretical modelling of ship/ice interaction, 1987 - 1990. The Technology Development Centre of Finland. Physical modelling of ship/ice interaction, 1986 - 1989, jointly with Canadian Coast Guard. The Joint Research Project Arrangement No. 3 (JRPA III) between Finland and Canada. Ice load penetration model, 1985 - 1987, jointly with National Research Council of Canada. The Joint Research Project Arrangement No. 1 (JRPA I) between Finland and Canada. Estimation of ice loading and strength of shell structure of MV Arctic, 1983, Canadian Coast Cuard. Statistical measurement of wave and ice loads on MV Arctic in the Canadian Arctic and North Atlantic, 1982, Canadian Coast Guard. Measurement of ice loads on Canmar Kigoriak in the Beaufort Sea August and October, 1981, Dome Petroleum.

Publications

Theses

Riska, K. 1978. On the Application of Macroscopic Failure Criteria on Columnar-Grained Ice. M.Sc. Thesis, Helsinki University of Technology, Department of General Sciences, Otaniemi 1978. 71 p. (in Finnish) Riska, K. 1978. On the Mechanics of the Ramming Interaction between a Ship and a Massive Ice Floe. Technical Research Centre of Finland, Publications 43, Espoo, 1987, 86 p.

Scientific publications

Riska, K. & Varsta, P. 1977. State-of-Art Review of Basic Ice Problems for a Naval Architect. Espoo 1977, VTT Ship Laboratory, Report No. 2, 63 p. Riska, K. & Varsta, P. 1977. Failure Process of Ice Edge Caused by Impact with Ships Side. Symposium in connection with 100 Years Celebration of Finnish Winter Navigation, Oulu, Finland, December 16–17, 1977. Publ. Board of Navigation, Helsinki 1979, pp. 235–262. Riska, K. 1980. On the Role of Failure Criterion of Ice in Determining Ice Loads. Espoo 1980, VTT Ship Laboratory, Report No. 7. 31 p. Enkvist, E. & Varsta, P. & Riska, K. 1979. The Ship-Ice Interaction. POAC 1979, Proceedings, vol. 2, Trondheim, August 13–18, 1979, pp. 977–1002. Vuorio, J. & Riska, K. & Varsta, P.1979. Long Term Measurements of Ice Pressure and Ice-Induced Stresses on the Icebreaker SISU in Winter 1978. Helsinki 1979, Winter Navigation Research Board, Report No. 28, 50 p. Riska, K. & Kujala, P. & Vuorio, J. 1983. Ice Load and Pressure Measurements onboard I.B. SISU. POAC 1983, Proceedings, Vol. 2, Helsinki, April 5–9, 1983, pp. 1055–1069. Nyman, T. & Riska, K. 1984. The Level Ice Resistance - Ideas Stemming from the Model and Full Scale Tests. VTT Symposium 52, Ship Strength and Winter Navigation, Espoo, January 10–11, 1984, pp. 183–200. Kujala, P. & Riska, K. 1983. Evaluation of Some Factors Influencing Material Selection for Arctic Vessels. Proceedings of the Study Session on Fracture Toughness Evaluation of Steels for Arctic Marine Use, October 1983, Ottawa, Canada, Publ. Physical Metallurgy Research Laboratories MRP/PMRL 83-72 (OP-J), pp. 3/1-3/27. Riska, K. & Frederking, R. 1987. Ice Load Penetration Modelling. POAC 1987, proceedings, Vol. 1, Fairbanks, Alaska, August 17–21, 1987, pp. 317–328. Riska, K. 1989. An Analysis of Factors Influencing Ship Response in Collision with Multi-Year Ice Floes. POAC 1989, Proceedings, Vol. 2, Luleå, June 12–16, 1989, pp. 750–763. Riska, K. 1991. Theoretical Modelling of Ice-Structure Interaction. S. Jones & R.McKenna & J. Tillotson & I. Jordaan (Eds.): Ice-Structure Interaction. IUTAM-IAHR Symposium, St. John's, Newfoundland, Canada, Springer-Verlag, Berlin,1991, pp. 595 – 618. Kujala, P. & Riska, K. & Varsta, P. & Koskivaara, R. & Nyman, T. 1990. Results from In-Situ Four Point Bending Tests with Baltic Sea Ice. IAHR Symposium on Ice 1990, Proceedings, Vol. 1, Espoo, Finland, August 20–24, 1990, pp. 261–278. Veitch, B. & Lensu, M. & Riska, K. & Kosloff, P. & Keiley, P. & Kujala, P. 1991. Field Observations of Ridges in the Northern Baltic Sea. 11th International Conference on Port and Ocean Engineering under Arctic Conditions (POAC), Proceedings, Vol 1, St. John's, Canada, September 24–28, 1991, pp. 381 – 400. Riska, K. 1991. Observations of the Line-like Nature of Ship-Ice Contact. 11th International Conference on Port and Ocean Engineering under Arctic Conditions, Proceedings, Vol 2, St. John's, Canada, September 24–28, 1991, pp. 785 – 811. Kujala, P. & Varsta, P. & Riska, K. 1993. Full-Scale Observations of Ship Performance in Ice. The 12th International Conference on Port and Ocean Engineering under Arctic Conditions, 17–20 August 1993, Hamburg, Germany, pp. 209–218. Soininen, H. & Nyman, T. & Riska, K. & Lohi, P. & Harjula, A. 1993. The Ice Capability of the Multipurpose Icebreaker FENNICA - Full-Scale Results. The 12th Int. Conference on Port and Ocean Engineering under Arctic Conditions (POAC), 17–20 August 1993, Hamburg, Germany, pp. 259–271. Riska, K. & Baarman, L. 1993. A Model for Ice Induced Vibration of Slender Offshore Structures. The 12th International Conference on Port and Ocean Engineering under Arctic Conditions (POAC), 17–20 August 1993, Hamburg, Germany, pp. 578–594.