|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ЦЭМИ РАН |
||
Methodology for assessment the avalanche nourishment of glaciersтезисы доклада Электронная публикация Тезисы
- Авторы: Sokratov S.A., Turchaninova A.S., Petrakov D.A., Seliverstov Yu G., Lazarev A.V., Bashkova E.I.
- Сборник: American Geophysical Union (AGU) 2019 Fall Meeting
- Тезисы
- Год издания: 2019
- Издательство: AGU Publications
- Местоположение издательства: Вашингтон
- Первая страница: C31B-1495
- Аннотация: The contribution of snow avalanches to the seasonal snow accumulation on a glacier is among the least studied components of the glacier’s mass balance. We propose a possible technique for the numerical assessment of snow avalanche contribution to accumulation at mountain glaciers. The developed methodology consists of the following steps: terrain analysis; weather data analysis; snow avalanche volume assessment during an analysed balance year; numerical simulation of snow avalanches using RAMMS; evaluation of snow avalanches contribution into a glacier accumulation. The proposed methodology was tested on three glaciers in the Inner Tien Shan: Batysh Sook, № 354 and Karabatkak during the 2015/16 balance year. To evaluate snow avalanche contribution to the seasonal accumulation, we reconstructed avalanche release zones that were most probably active during the 2015/16 balance year and corresponding snow fracture height in each of these zones. The numerical simulations of most probable released snow avalanches during the winter period 2015/16 using avalanche dynamics software RAMMS were performed and compared with the field observations and UAV orthophoto image from July 2016. The outlines of avalanches deposits were realistically reproduced by RAMMS according to the results of field observation. The estimated share of snow avalanche contribution to the accumulation on the studied glaciers during the 2015/16 balance year turned out to be: Batysh Sook – 7,4±2,5%; № 354 – 2,2±0,7%; Karabatkak – 10,8±3,6% of the winter mass balance.At the next step we applied the developed methodology for the Kolka glacier in the Caucasus. In strong contradiction to the benchmark glaciers in the region, the Kolka demonstrates rapid mass gain. It might be explained by significant, up to 80% share of avalanche feeding to glacier mass balance. We also note that avalanche-fed glaciers seem to be more stable at current stage of regional warming observed both at the Caucasus and Tian Shan.The research was supported by the RFBR grant № 18-35-00419 “Evaluation of snow avalanches contribution into glacier accumulation provided a lack of direct observational data”.https://abstractsearch.agu.org/meetings/2019/FM/C31B-1495.html
- Добавил в систему: Сократов Сергей Альфредович