Structure of snow-­ice dams of the outburst lakes in the Broknes Peninsula (Larsemann Hills, East Antarctica) based on ground­penetrating radar data

• Published in: Ice and Snow
• Main Authors: S. Grigoreva D., E. Kiniabaeva R., M. Kuznetsova R., S. Popov V., M. Kashkevich P., С. Григорьева Д., Э. Киньябаева Р., М. Кузнецова Р., С. Попов В., М. Кашкевич П.
• Other Authors: The authors are grateful to their colleagues during the 65th Russian Antarctic Expedition A.V. Mirakin, A.V. Semionov, I.B. Khokhriakov for their assistance in the field investigations. The research was supported by RFBR within the framework of the projects № 18-05-00421 «Characteristics of formation and evolution of the outburst floods of Antarctic subglacial reservoirs» and № 20-05-00343 «Identification of the main features of outbursts at the lakes of Antarctic oases based on the fieldwork data and mathematical modeling»., Авторы выражают благодарность своим коллегам по 65-й Российской антарктической экспедиции А.В. Миракину, А.В Семёнову, И.Б. Хохрякову за помощь в проведении полевых исследований. Работа выполнена при поддержке грантов РФФИ № 18-05-00421 «Особенности формирования и развития паводков подледниковых водоёмов Антарктиды» и № 20-05-00343 «Выявление особенностей протекания процесса прорывов озёр оазисов Антарктиды на основе данных полевых исследований и математического моделирования».
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: IGRAS 2021
• Subjects: Broknes Peninsula;East Antarctica;ground-penetrating radar;Larsemann Hills;outburst floods; Восточная Антарктида;георадарное профилирование;полуостров Брокнес;прорывные паводки;Холмы Ларсеманн; Antarctic; East Antarctica; Larsemann Hills; Broknes; Progress Lake; Antarc*; Antarctica; Антарктида
• Online Access: https://ice-snow.igras.ru/jour/article/view/896; https://doi.org/10.31857/S2076673421020089

During the summer field season of the 65th Russian Antarctic Expedition a research aimed at studying the structure of the snow-­ice dams of the Lakes Progress and Discussion (Larsemann Hills, East Antarctica), which are characterized with annual outburst floods, was carried out. Survey was performed using ground­penetrating radar sounding complemented with non­core drilling and analysis of the aerial photo data acquired with unmanned aerial vehicle during the last field seasons. The results show that location of the waterways, which occur during the outbursts of the both lakes, does not change significantly year in year out and fits a linear depression in basement topography under the dam and a following flexure of the ice layer. During the winter period, the opened channels are being filled with snow, and thereby a natural soſtened zone is being formed. Further outburst flood propagates mainly within this zone. Monitoring survey of the snow­i-ce dam of the Progress Lake during the summer period showed that destruction of the dam does not happen rapidly when the outburst takes place, but begins a few weeks before it with gradual filtration within the snow layer. Приведены результаты изучения строения снежно-ледовых перемычек прорывоопасных озёр Прогресс и Дискашн (оазис Холмы Ларсеманн, Восточная Антарктида), выполненные методом георадиолокации. Дополнительно проведены бескерновое механическое бурение и аэрофотосъёмка с использованием беспилотного летательного аппарата. На примере изученных водоёмов установлены основные геолого-гляциологические тенденции формирования прорывных паводков ледниковых озёр.