30 September 2019 to 3 October 2019
The Royal Danish Academy of Sciences and Letters
Europe/Copenhagen timezone

Temperature distribution in ice around thermally drilled borehole

30 Sep 2019, 17:20
4m
The Royal Danish Academy of Sciences and Letters

The Royal Danish Academy of Sciences and Letters

The Royal Danish Academy of Sciences and Letters H.C. Andersens Boulevard 35 DK-1553 Copenhagen V Denmark
Poster Session 2

Speaker

Dr Xiao Li (Polar Research Center, Jilin University, Changchun, China)

Description

As one of the effective methods of rapid ice drill, thermal drilling is widely used to study ice sheets and glaciers. After drilling, the refreezing of the meltwater in the borehole is the key factor hindering down-the-hole observations. The temperature distribution in ice around thermally drilled borehole has a direct impact on the closure rate of the borehole. In order to determine the temperature distribution around the borehole and the ice boundary affected by the thermal drilling, a temperature field detection testing stand using hot-point drill with constant bit load was designed. The temperature distribution around the borehole during hot-point drilling process and the closure process in ice with temperature in the range from -10 to -30 ℃ were measured. The borehole was drilled by different diameters drill bits with 1-2 kW power. The results showed that the distance from the temperature changing boundary to the borehole is about 2-3 times of the borehole radius during thermal drilling, and after drilling, the influence of melting water on the temperature changing boundary is about 10 times of the ice hole radius.

Primary author

Dr Xiao Li (Polar Research Center, Jilin University, Changchun, China)

Co-authors

Dr Xiaopeng Fan (Polar Research Center, Jilin University, Changchun, China) Mr Jinbo Wang (Polar Research Center, Jilin University, Changchun, China) Mr LiXian Dai (Polar Research Center, Jilin University, Changchun, China) Ms Xueqi Wang (Polar Research Center, Jilin University, Changchun, China) Prof. Pavel Talalay (Polar Research Center, Jilin University, Changchun, China)

Presentation Materials

There are no materials yet.