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Estimating and managing blowout risk during access to subglacial Antarctic lakes

Published online by Cambridge University Press:  09 August 2012

Mario P. Brito ,
Gwyn Griffiths ,
Matthew Mowlem  and
Keith Makinson
Mario P. Brito*
Affiliation:
National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton SO14 13ZH, UK
Gwyn Griffiths
Affiliation:
National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton SO14 13ZH, UK
Matthew Mowlem
Affiliation:
National Oceanography Centre, University of Southampton Waterfront Campus, European Way, Southampton SO14 13ZH, UK
Keith Makinson
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
*
mario.brito@noc.ac.uk
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Abstract

As Antarctic subglacial lake research progresses to in situ exploration an important topic is the lake's probable gas concentration. Depending on hydrological setting, subglacial lakes may contain large amounts of dissolved gas or gas trapped within clathrates. Consequently, access can be potentially dangerous due to the risk of blowout where depressurization could lead to high-speed ejection of water and gas from a borehole. We present a structured approach to assess the blowout risk in subglacial lake exploration. The approach integrates a generic event tree, applicable to open and closed hydrological systems, with site-specific expert judgment incorporating rigorous probabilistic formulations. The methodology is applied to a motivating example: Ellsworth Subglacial Lake. Judgments elicited through a formal process were provided by five experts with 88 years combined experience that, after aggregation, gave a median risk of blowout of 1 in 2186 with a lower quartile of 1 in 3433 and an upper quartile of 1 in 1341. This approach can be applied to any subglacial lake given a modicum of knowledge on its hydrological setting, as uncertainty can be captured through the elicited judgments. Additionally, the event tree analysis informs blowout mitigation strategies to reduce risk of injury or death.

Keywords

Ellsworth Subglacial Lakeexpert judgmenthot-water drilling
Type
Physical Sciences
Information
Antarctic Science , Volume 25 , Issue 1 , February 2013 , pp. 107 - 118
Copyright
Copyright © Antarctic Science Ltd 2012

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References

Ang, M.L.Buttery, N.E. 1997. An approach to the application of subjective probabilities in level 2 PSAs. Reliability Engineering and System Safety, 58, 145–156.CrossRefGoogle Scholar
Bentley, C.R.Koci, B.R. 2007. Drilling to the beds of the Greenland and Antarctic ice sheets: a review. Annals of Glaciology, 47, 1–9.CrossRefGoogle Scholar
Brito, M.P., Griffiths, G., Mowlem, M., Waugh, E., Saw, K., Wyatt, J.B., Tsaloglou, M-N., Fowler, L., Campbell, J.Rundle, N. 2011. Reliability Case Notes No. 6. Risk assessment of the Ellsworth probe: development, design and deployment. Southampton: National Oceanography Centre, 40 pp.Google Scholar
CEE. 2011. Proposed exploration of Subglacial Lake Ellsworth, Antarctica: draft comprehensive environmental evaluation. http://www.antarctica.ac.uk/about_antarctica/geography/environment/eia/subglacial_lake_ellsworth_cee.pdfGoogle Scholar
Ellis-Evans, J.C.Wynn-Williams, D.D. 1996. A great lake under the ice. Nature, 381, 644–646.CrossRefGoogle Scholar
Filina, I.Y., Blankenship, D.D., Thoma, M., Lukin, V.V., Masolov, V.N.Sen, M.K. 2008. New 3D bathymetry and sediment distribution in Lake Vostok: implication for pre-glacial origin and numerical modeling of the internal processes within the lake. Earth and Planetary Science Letters, 276, 106–114.CrossRefGoogle Scholar
Holand, P.Rausand, M. 1987. Reliability of subsea BOP systems. Reliability Engineering, 19, 263–275.CrossRefGoogle Scholar
HSE. 1992. Tolerability of risk for nuclear power stations. UK: Health and Safety Executive, 62 pp.Google Scholar
HSE. 2001. Reducing risks, protecting people. UK: Health and Safety Executive, http://www.hse.gov.uk/risk/theory/r2p2.pdfGoogle Scholar
Ikeda, T., Fukazawa, H., Mae, S., Pepin, L., Duval, P., Champagnon, B., Lipenkov, V.Y.Hondoh, T. 1999. Extreme fractionation of gases caused by formation of clathrate hydrates in Vostok Antarctic ice. Geophysical Research Letters, 26, 91–94.CrossRefGoogle Scholar
Kynn, M. 2008. The ‘heuristics and biases’ bias in expert elicitation. Royal Statistical Society: Series A, 171, 239–264.CrossRefGoogle Scholar
Lipenkov, V.Ya.Istomin, V.A. 2001. On the stability of air clathrate-hydrate crystals in subglacial Lake Vostok, Antarctica. Material of Glaciological Investigations, 91, 138–148. [In Russian].Google Scholar
Makinson, K. 1993. The BAS hot water drill: development and current design. Cold Regions Science and Technology, 22, 121–132.CrossRefGoogle Scholar
McIntyre, N.F. 1983. The topography and flow of the Antarctic ice sheet. PhD thesis, University of Cambridge, 198 pp. [Unpublished.]Google Scholar
McKay, C.P., Hand, K.P., Doran, P.T., Andersen, D.T.Priscu, J.C. 2003. Clathrate formation and the fate of noble and biologically useful gases in Lake Vostok, Antarctica. Geophysical Research Letters, 10.1029/2003GL017490.CrossRefGoogle Scholar
Mowlem, M., Tsaloglou, M.-N., Waugh, E.M., Floquet, C.F.A., Saw, K., Fowler, L., Brown, R., Pearce, D., Wyatt, J.B., Beaton, A.D., Brito, M.P., Hodgson, D.A., Griffiths, G. and Lake Ellsworth Consortium 2011. Probe technology for the direct measurement and sampling of Ellsworth Subglacial Lake. Geophysical Monograph Series, 192, 159–186.CrossRefGoogle Scholar
O'Hagan, A., Buck, C.E., Daneshkhah, A., Eiser, J.E., Garthwaite, P.H., Jenkinson, D.J., Oakley, J.E.Rakow, T. 2006. Uncertain judgements: eliciting expert probabilities. Chichester: Wiley, 328 pp.CrossRefGoogle Scholar
Otway, H.Winterfeldt, D. 1992. Expert judgment in risk analysis and management: process, context, and pitfalls. Risk Analysis, 12, 83–93.CrossRefGoogle ScholarPubMed
Oswald, G.K.A. & Robin, G. De Q. 1973. Lakes beneath the Antarctic ice sheet. Nature, 245, 251–254.CrossRefGoogle Scholar
Renooij, S.Witteman, C. 1999. Talking probabilities: communicating probabilistic information with words and numbers. International Journal of Approximate Reasoning, 22, 169–194.CrossRefGoogle Scholar
Robin, G. De Q., Swithinbank, C.W.M. & Smith, B.M.E. 1970. Radio echo exploration of the Antarctic ice sheet. International Association of Scientific Hydrology Publication, 86, 97–115.Google Scholar
Robinson, R.V. 1960. Experiment in visual orientation during flights in the Antarctic. International Bulletin of the Soviet Antarctic Expeditions, 18, 28–29.Google Scholar
SCAR. 2010. Code of conduct for the exploration and research of subglacial aquatic environments. XXXI Scientific Committee on Antarctic Research (SCAR) Delegates Meeting, 9–11 August 2010, Buenos Aires, Argentina, SCAR SSG-LS 2010 Doc 16.Google Scholar
Siegert, M.J., Dowdeswell, J.A., Gorman, M.R.McIntyre, N.F. 1996. An inventory of Antarctic subglacial lakes. Antarctic Science, 8, 281–286.CrossRefGoogle Scholar
Siegert, M.J., Carter, S., Tabacco, I., Popov, S.Blankenship, D.D. 2005. A revised inventory of Antarctic subglacial lakes. Antarctic Science, 17, 453–460.CrossRefGoogle Scholar
Siegert, M.J., Clarke, R.J., Mowlem, M., Ross, N., Hill, C.S., Tait, A., Hodgson, D., Parnell, J., Tranter, M., Pearce, D., Bentley, M., Cockell, C., Tsaloglou, M.N., Smith, A., Woodward, J., Brito, M.P.Waugh, E. 2011. Clean access, measurement, and sampling of Ellsworth Subglacial Lake: a method for exploring deep Antarctic subglacial lake environments. Reviews of Geophysics, 10.1029/2011RG000361.Google Scholar
Siegert, M.J., Behar, A., Bentley, M., Blake, D., Bowden, S., Christoffersen, P., Cockell, C., Corr, H., Cullen, D.C., Edwards, H., Ellery, A., Ellis-Evans, C., Griffiths, G., Hindmarsh, R., Hodgson, D.A., King, E., Lamb, H., Lane, L., Makinson, K., Mowlem, M., Parnell, J., Pearce, D.A., Priscu, J., Rivera, A., Sephton, M.A., Sims, M.R., Smith, A.M., Tranter, M., Wadham, J.L., Wilson, G.Woodward, J. 2007. Exploration of Ellsworth Subglacial Lake: a concept paper on the development, organization and execution of an experiment to explore, measure and sample the environment of a West Antarctic subglacial lake. Reviews in Environmental Science and Biotechnology, 6, 161–179.CrossRefGoogle Scholar
Signoret, J.P.Leroy, A. 1985. The 1800 m water depth drilling project: risk analysis. Reliability Engineering, 11, 83–92.CrossRefGoogle Scholar
Vaughan, D.G., Rivera, A., Woodward, J., Corr, H.F.J., Wendt, J.Zamora, R. 2007. Topographic and hydrological controls on Subglacial Lake Ellsworth, West Antarctica. Geophysical Research Letters, 10.1029/2007GL030769.CrossRefGoogle Scholar
Volkanovski, A., Cepin, M.Mavko, B. 2009. Application of the fault tree analysis for assessment of power system reliability. Reliability Engineering and System Safety, 94, 1116–1127.CrossRefGoogle Scholar
Woodward, J., Smith, A.M., Ross, N., Thoma, M., Corr, H.F.J., King, E.C., King, M.A., Grosfeld, K., Tranter, M.Siegert, M.J. 2010. Location for direct access to Subglacial Lake Ellsworth: an assessment of geophysical data and modelling. Geophysical Research Letters, 1029/2010GL042884.CrossRefGoogle Scholar