Publication Abstracts

Shields et al. 2023

Shields, C., P. Talalay, X. Fan, A.P. Lines, J. Elliott, H. Rajaram, K. Mankoff, M. Jensen, M. Backes, Y. Liu, X. Wei, N.B. Karlsson, H. Spanggård, and A.Ø. Pedersen, 2023: Design and performance of the Hotrod melt-tip ice-drilling system. Geosci. Instrum. Method. Data Syst., 12, no. 2, 121-140, doi:10.5194/gi-12-121-2023.

We introduce the design and performance of an electrothermal ice-drilling system designed to insert a temperature sensor cable into ice. The melt tip is relatively simple and low-cost, designed for a one-way trip to the ice-bed interface. The drilling system consists of a melt tip, umbilical cable, winch, interface, power supply, and support items. The melt tip and the winch are the most novel elements of the drilling system, and we make the hardware and electrical designs of these components available open-access. Tests conducted in a laboratory indicate that the melt tip has an electrical energy to forward melting heat transfer efficiency of ∼35% with a theoretical maximum penetration rate of ∼12 m/h at maximum 6.0 kW power. In contrast, ice-sheet testing suggests the melt tip has an analogous heat transfer efficiency of ∼15% with a theoretical maximum penetration rate of ∼6 m/h. We expect the efficiency gap between laboratory and field performance to decrease with increasing operator experience. Umbilical freeze-in due to borehole refreezing is the primary depth-limiting factor of the drilling system. Enthalpy-based borehole refreezing assessments predict refreezing below critical umbilical diameter in ∼4 h at -20°C ice temperatures and ∼20 h at -2°C. This corresponds to a theoretical depth limit of up to ∼200 m, depending on firn thickness, ice temperature, and operator experience.

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BibTeX Citation

  author={Shields, C. and Talalay, P. and Fan, X. and Lines, A. P. and Elliott, J. and Rajaram, H. and Mankoff, K. and Jensen, M. and Backes, M. and Liu, Y. and Wei, X. and Karlsson, N. B. and Spanggård, H. and Pedersen, A.Ø.},
  title={Design and performance of the Hotrod melt-tip ice-drilling system},
  journal={Geosci. Instrum. Method. Data Syst.},

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RIS Citation

ID  - co01410l
AU  - Shields, C.
AU  - Talalay, P.
AU  - Fan, X.
AU  - Lines, A. P.
AU  - Elliott, J.
AU  - Rajaram, H.
AU  - Mankoff, K.
AU  - Jensen, M.
AU  - Backes, M.
AU  - Liu, Y.
AU  - Wei, X.
AU  - Karlsson, N. B.
AU  - Spanggård, H.
AU  - Pedersen, A.Ø.
PY  - 2023
TI  - Design and performance of the Hotrod melt-tip ice-drilling system
JA  - Geosci. Instrum. Method. Data Syst.
VL  - 12
IS  - 2
SP  - 121
EP  - 140
DO  - 10.5194/gi-12-121-2023
ER  -

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