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Air reverse circulation at the hole bottom in ice-core drilling

  • ZHENGYI HU (a1) (a2), PAVEL TALALAY (a2), ZHICHUAN ZHENG (a2), PINLU CAO (a2), GUITAO SHI (a1), YUANSHENG LI (a1), XIAOPENG FAN (a2) and HONGMEI MA (a1)...

Abstract

Ice-core drilling to depths of 200–300 m is an important part of research studies concerned with paleoclimate reconstruction and anthropogenic climate change. However, conventional drilling methods face difficulties due to firn permeability. We have developed an electromechanical ice-core drill with air reverse circulation at the hole bottom. We believe that the new drilling system will recover ice cores faster than shallow auger drills, with high efficiency and low energy consumption. The theoretically estimated up-hole speed of the airflow should be not <7.7 m s−1 to allow proper removal of ice cuttings from the borehole bottom. The computer simulation and test results showed that the design of the new ice-coring drill is feasible. The maximum allowed penetration rate depends by square law on airflow.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Correspondence: Talalay Pavel <ptalalay@yahoo.com> and Hu Zhengyi <huzhengyi@pric.org.cn>

References

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Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
  • URL: /core/journals/journal-of-glaciology
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