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Modelling glacial lake outburst flood impacts in the Bolivian Andes

Author

Listed:
  • Ioannis Kougkoulos

    (Manchester Metropolitan University)

  • Simon J. Cook

    (University of Dundee)

  • Laura A. Edwards

    (Liverpool John Moores University)

  • Leon J. Clarke

    (Manchester Metropolitan University)

  • Elias Symeonakis

    (Manchester Metropolitan University)

  • Jason M. Dortch

    (University of Kentucky)

  • Kathleen Nesbitt

    (University of Manchester)

Abstract

The Bolivian Andes have experienced sustained and widespread glacier mass loss in recent decades. Glacier recession has been accompanied by the development of proglacial lakes, which pose a glacial lake outburst flood (GLOF) risk to downstream communities and infrastructure. Previous research has identified three potentially dangerous glacial lakes in the Bolivian Andes, but no attempt has yet been made to model GLOF inundation downstream from these lakes. We generated 2-m resolution DEMs from stereo and tri-stereo SPOT 6/7 satellite images to drive a hydrodynamic model of GLOF flow (HEC-RAS 5.0.3). The model was tested against field observations of a 2009 GLOF from Keara, in the Cordillera Apolobamba, and was shown to reproduce realistic flood depths and inundation. The model was then used to model GLOFs from Pelechuco lake (Cordillera Apolobamba) and Laguna Arkhata and Laguna Glaciar (Cordillera Real). In total, six villages could be affected by GLOFs if all three lakes burst. For sensitivity analysis, we ran the model for three scenarios (pessimistic, intermediate, optimistic), which give a range of ~ 1100 to ~ 2200 people affected by flooding; between ~ 800 and ~ 2100 people could be exposed to floods with a flow depth ≥ 2 m, which could be life threatening and cause a significant damage to infrastructure. We suggest that Laguna Arkhata and Pelechuco lake represent the greatest risk due to the higher numbers of people who live in the potential flow paths, and hence, these two glacial lakes should be a priority for risk managers.

Suggested Citation

  • Ioannis Kougkoulos & Simon J. Cook & Laura A. Edwards & Leon J. Clarke & Elias Symeonakis & Jason M. Dortch & Kathleen Nesbitt, 2018. "Modelling glacial lake outburst flood impacts in the Bolivian Andes," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 94(3), pages 1415-1438, December.
    • Handle: RePEc:spr:nathaz:v:94:y:2018:i:3:d:10.1007_s11069-018-3486-6
    DOI: 10.1007/s11069-018-3486-6
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    References listed on IDEAS

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    1. Miyuki Hino & Christopher B. Field & Katharine J. Mach, 2017. "Managed retreat as a response to natural hazard risk," Nature Climate Change, Nature, vol. 7(5), pages 364-370, May.
    2. M. Jakob & D. Stein & M. Ulmi, 2012. "Vulnerability of buildings to debris flow impact," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 60(2), pages 241-261, January.
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