The evolution of Petrov lake and moraine dam rupture risk (Tien-Shan,Kyrgyzstan) |
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| Authors: | Bohumír Janský Zbyněk Engel Miroslav Šobr Vojtěch Beneš Karel Špaček Serguei Yerokhin |
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| Institution: | (1) Faculty of Science, Department of Physical Geography and Geoecology, Charles University in Prague, Prague, Czech Republic;(2) GIMPULS Prague, Prague, Czech Republic;(3) Government Institute of Geology and Mineral Resources, Bishkek, Kyrgyz Republic |
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| Abstract: | An interdisciplinary study of glacier-related hazards in the Petrov lake region (Ak-Shiirak Range, the Inner Tien-Shan, Kyrgyzstan)
has been undertaken to identify potential dangers to the area. A cooperative effort from experts in the fields of hydrology,
glaciology, geomorphology and geophysics has been employed in this study. For the hazard assessment, evolution of the Petrov
glacier and lake was reconstructed using historical reports, aerial photographs and satellite images. Geomorphological mapping
and geophysical soundings was applied to the lake territory and the moraine dam. This has identified potentially hazardous
areas of the dam including subsurface drainage zones and cracks that could cause a sudden extremely high discharge. In the
past three decades, the Petrov lake has doubled in size, while in recent years, its area has been increasing by more than
92,000 square metres per year. Although there is no evidence for an imminent outburst, the dramatic increase in the lake’s
size emphasizes the importance of this study. |
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| Keywords: | Moraine-dammed lake Rupture risk Bathymetry Geophysical measurements Glacier fluctuations Petrov glacier Tien-Shan |
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