Articles | Volume 26, issue 2
https://doi.org/10.5194/nhess-26-733-2026
https://doi.org/10.5194/nhess-26-733-2026
Research article
 | 
06 Feb 2026
Research article |  | 06 Feb 2026

Modelling the effectiveness of GLOF DRM measures – a case study from the Ala-Archa valley, Kyrgyz Republic

Laura Niggli, Holger Frey, Simon Allen, Nazgul Alybaeva, Christian Huggel, Bolot Moldobekov, and Vitalii Zaginaev

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Cited articles

Allen, S., Rastner, P., Arora, M., Huggel, C., and Stoffel, M.: Lake outburst and debris flow disaster at Kedarnath, June 2013: hydrometeorological triggering and topographic predisposition, Landslides, 13, 1479–1491, https://doi.org/10.1007/s10346-015-0584-3, 2016. 
Allen, S., Frey, H., Huggel, C. et al.: GAPHAZ 2017: Assessment of Glacier and Permafrost Hazards in Mountain Regions – Technical Guidance Document, Standing Group on Glacier and Permafrost Hazards in Mountains (GAPHAZ) of the International Association of Cryospheric Sciences (IACS) and the International Permafrost Association (IPA), Zurich, Switzerland/Lima, Peru, 72 pp., https://gaphaz.org/data-reports (last access: 3 February 2026), 2017. 
Allen, S., Zhang, G., Wang, W., Yao, T., and Bolch, T.: Potentially dangerous glacial lakes across the Tibetan Plateau revealed using a large-scale automated assessment approach, Sci. Bull. (Beijing), 64, 435–445, https://doi.org/10.1016/j.scib.2019.03.011, 2019. 
Ballesteros Cánovas, J. A., Stoffel, M., Corona, C., Schraml, K., Gobiet, A., Tani, S., Sinabell, F., Fuchs, S., and Kaitna, R.: Debris-flow risk analysis in a managed torrent based on a stochastic life-cycle performance, Science of the Total Environment, 557–558, 142–153, https://doi.org/10.1016/j.scitotenv.2016.03.036, 2016. 
Bartelt, P., Bieler, C., Bühler, Y., Christen, M., Deubelbeiss, Y., Graf, C., McArdell, B., Salz, M., and Schneider, M.: RAMMS: DEBRISFLOW User Manual v1.8.0, https://ramms.ch/wp-content/uploads/RAMMS_DBF_Manual.pdf (last access: 3 February 2026), 2022. 
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Short summary
Glacial lake outburst floods (GLOF) pose significant risks to communities and infrastructure. Our study explores how effective different measures are in reducing such risks. Using numerical modelling, we evaluate three strategies: lowering lake levels, building a deflection dam, and creating a retention basin. We compared their hazard and exposure reduction and their costs and benefits. This offers insights that can improve GLOF risk management worldwide and support better decision-making.
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