TY - JOUR

T1 - Строение снежно-ледовых перемычек прорывных озёр полуострова Брокнес (оазис Холмы Ларсеманн, Восточная Антарктида) по данным георадиолокации

AU - Григорьева, Светлана Дмитриевна

AU - Киньябаева, Эльвира Равилевна

AU - Кузнецова, Мария Руслановна

AU - Попов, Сергей Викторович

AU - Кашкевич, Марина Петровна

N1 - Funding Information: Acknowledgements. The authors are grateful to their colleagues during the 65th Russian Antarctic Expedi tion A.V. Mirakin, A.V. Semionov, I.B. Khokhriakov for their assistance in the field investigations. The re search 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». Publisher Copyright: © 2021 Izdatel'stvo Nauka. All rights reserved.

PY - 2021

Y1 - 2021

N2 - During the summer field season of the 65 th Russian Antarctic Expedition a research aimed at studying the structure of the snowice 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 softened zone is being formed. Further outburst flood propagates mainly within this zone. Monitoring survey of the snowice 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.

AB - During the summer field season of the 65 th Russian Antarctic Expedition a research aimed at studying the structure of the snowice 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 softened zone is being formed. Further outburst flood propagates mainly within this zone. Monitoring survey of the snowice 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.

KW - Broknes Peninsula

KW - East Antarctica

KW - Ground-penetrating radar

KW - Larsemann Hills

KW - Outburst floods

KW - Broknes Peninsula

KW - East Antarctica

KW - Larsemann Hills

KW - ground-penetrating radar

KW - outburst floods

KW - Ground-penetrating radar

KW - Outburst floods

UR - http://www.scopus.com/inward/record.url?scp=85107523231&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/9a0a4b9c-b923-3ffb-9305-a48331874ceb/

U2 - 10.31857/S2076673421020089

DO - 10.31857/S2076673421020089

M3 - статья

VL - 61

SP - 291

EP - 300

JO - Лед и Снег

JF - Лед и Снег

SN - 2076-6734

IS - 2

ER -