Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-228
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
11 Jul 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Large drainages from short-lived glacial lakes in the Teskey Range, Tien Shan Mountains, Central Asia
Chiyuki Narama1, Mirlan Daiyrov1,2, Murataly Duishonakunov3, Takeo Tadono4, Hayato Satoh1,5, Andreas Kääb6, Jinro Ukita1, and Kanatbek Abdrakhmatov7 1Department of Environmental Science, Niigata University, Niigata, Japan
2Central-Asian Institute for Applied Geosciences (CAIAG), Bishkek, Kyrgyzstan
3Department of Physical Geography, Kyrgyz National University
4Japan Aerospace Exploration Agency (JAXA), Tsukuba, Japan
5Kokusai Kogyo Co., Ltd, Tokyo
6Department of Geoscience, University of Oslo, Norway
7Institute of Seismology, Kyrgyz Academy of Science, Kyrgyzstan
Abstract. During 2006–2014 in the western Teskey Range, Kyrgyzstan, four large drainages from glacial lakes have occurred. These flooding events caused extensive damage, killing people and livestock as well as destroying bridges, roads, homes, and crops. According to satellite data analysis and field surveys, the volume of water that drained at Kashkasuu glacial lake in 2006 was 198,000 m3, that at Jeruy lake in 2013 was 163,000 m3, and that at Karateke lake in 2014 was 169,000 m3. Due to their tunnel outlet, we refer here to these glacial lakes as a tunnel-type of short-lived glacial lakes that drastically grow and drain over several months. From spring to early summer, such a lake either appears, or in some cases, significantly expands from an existing lake, and then drains during summer. Our field surveys show that these short-lived lakes form when the ice tunnels inside a debris landform get blocked. The blocking is caused either by the freezing of stored water during winter or from collapse of the ice tunnel. The draining occurs through an open ice tunnel during summer. The growth–drain cycle can repeat when the ice-tunnel closure behaves like that on supraglacial lakes on debris-covered glacier. We argue here that the geomorphological conditions in which such a short-lived glacial lake appears are (i) existence of an ice-containing debris-landform (moraine complex), (ii) existence of lake-basin depressions having its water supply on a debris-landform, and (iii) no surface water channel from lake-basin depressions. Using these geomorphological conditions, we examined 60 lake-basin depressions (> 0.01 km2) in this region and identify here 56 of them that are potential locations for a short-lived glacial lake.

Citation: Narama, C., Daiyrov, M., Duishonakunov, M., Tadono, T., Satoh, H., Kääb, A., Ukita, J., and Abdrakhmatov, K.: Large drainages from short-lived glacial lakes in the Teskey Range, Tien Shan Mountains, Central Asia, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-228, in review, 2017.
Chiyuki Narama et al.
Chiyuki Narama et al.
Chiyuki Narama et al.

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