Эволюция озёр у ледника Джикиуганкез (Северное Приэльбрусье) в 1957–2020 гг. с учётом подземных каналов стока

Докукин, М.Д.; Савернюк, Е.А.; Беккиев, М.Ю.; Калов, Р.Х.; Хаткутов, А.В.

Авторы: Докукин М.Д., Савернюк Е.А., Беккиев М.Ю., Калов Р.Х., Хаткутов А.В.
Журнал: Лед и снег
Том: 62
Номер: 1
Год издания: 2022
Издательство: ФГБУ "Издательство "Наука"
Местоположение издательства: Москва
Первая страница: 47
Последняя страница: 62
Переводные версии: Evolution of lakes at Dzhikiugankez Glacier (Northern Elbrus Region) in 1957–2020, taking into account subsurface flow channels
DOI: 10.31857/S2076673422010115
Аннотация: Evolution of lakes near the Dzhikiugankez Glacier in the north of Elbrus for the period of 1957–2020 was studied using a comparative interpretation of aerial and satellite images as well as aerial and ground surveys in 2007–2018. Within this period the area of the Dzhikiugankez Glacier (43,35 N, 42,53 E) decreased by 8.2 km2. On the territory previously occupied by the glacier and close to it, 19 lakes appeared at different times, which dynamically developed and broke through. The lakes cover the area of 0.43 km2, that equals to 5.21% of the total icefree area. The average area of the lakes is 26.6 thousand m2. The maximum (the lake East Birdzhaly) is 89 thousand m2. In total there were six lakes larger than 25 thousand m2. They are concentrated in depressions on the surface of an ancient lava flow dammed by laciers, dead ices and moraine lines. At a certain stage in the evolution of lakes, water from them enetrated through these barriers and, thus, formed ubglacial and underground drainage channels. In 2013, during helicopter flights, an underground drainage hannel with a length of more than 80 m was detected in the moraine line around the Lake «Podkova». The survey made possible to determine decreasing in the lake level by 2 m, and the accumulation of water with a volume of up to 48 thousand m3 in the cavities of the moraine massif, until it reaches the outer slope. The accumulated volume of water interflowed through the underground channel gradually, but despite the pot-holes on its bottom, no mudflow happened in the valley. Although in another case, the ormation of an underground drainage channel from the Severnoye Chungurchat Lake was accompanied by a lake breakthrough and a mudflow. Other haracteristic features of the evolution of lakes and changes in the direction of drainage from glaciers are also analyzed in the paper.
Добавил в систему: Савернюк Елена Александровна

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Эволюция озёр у ледника Джикиуганкез (Северное Приэльбрусье) в 1957–2020 гг. с учётом подземных каналов стокастатья Исследовательская статья

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