Exploration of breakthrough lakes in the river basin Karatag

Exploration of breakthrough lakes in the river basin Karatag

From September 20 to 27, 2019, in the Karatag river basin, specialists of the Agency for Hydrometeorology of the Committee for Environmental Protection under the Government of the Republic of Tajikistan R. Rakhmonov, head of the glaciological center, Khudodov H., head of the hydrography and expedition department, as well as specialists in the forecasting, information and archiving Nazirzoda K. and Nazirov B. were trained in the study of breakthrough lakes Piron and Temurdara. The main purpose of this training was to assess the state of high mountain lakes as a result of general climate change in the Karatag basin.

Byron  lake is located in the middle reaches of the Payron River at an altitude of 2123 m above sea level. The surface area of ​​the lake reaches 160 thousand m2, and the volume is 173 thousand m3.

                                                                                                                          Picture 1. Lake Pyron

Observations showed that the volume of water decreased from normal limits and that the water level in the lake was lower than a maximum of 2-2.5 m. Therefore, the water in the lake was below the level of the drain.

The influx of water due to the low water level in the lake is caused by filtration through the dam body. This indicates that in autumn water consumption is lower than its spring feed and amounts to 1.2 m3/s.

Trees and shrubs grow on the body of the lake dam, which indicates the long-term stability of the dam.

The water temperature in the lake was in the range of 10-110 C. Around Lake Payron and the river flowing from it, no signs of flood events were found.

Lake Timurdara. The lake is located in the middle reaches of the Kaznak River, which is the left tributary of the Karatag River. The area of ​​the mirror is 80 thousand m2, and the volume of water is 720 thousand m3. The lake is located at an altitude of 1986.3 m above sea level.

Picture 2. Lake Temurdara

Water flow from the lake is carried out through the channel in the upper part of the dam and a small fraction of the filtration through the body of the dam.

At the time of the survey, the water level in the lake ranges from 60 to 80 cm. This indicates that the water consumption is lower than when feeding in the spring. The flow rate is 0.7 m3 / s. The dam is stable and there is no risk of breakthroughs. The water temperature in the lake reached 12-130 C. No signs of flood events were found around Lake Temurdara.

Observations show that the lakes are currently in a stable condition and no destruction is expected in the near future. This year, in autumn, the water level of the lakes decreased, which eliminates the risk of flooding around the lakes.

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