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

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

Content Provider	Scilit
Author	Hu, Zhengyi Talalay, Pavel Zheng, Zhichuan Cao, Pinlu Shi, Guitao Li, Yuansheng Fan, Xiaopeng Ma, Hongmei
Copyright Year	2019
Description	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.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/DCDB4123291A047D740065797D533323/S0022143018000953a.pdf/div-class-title-air-reverse-circulation-at-the-hole-bottom-in-ice-core-drilling-div.pdf
Ending Page	156
Page Count	8
Starting Page	149
ISSN	00221430
e-ISSN	17275652
DOI	10.1017/jog.2018.95
Journal	Journal of Glaciology
Issue Number	249
Volume Number	65
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	2019-02-01
Access Restriction	Open
Subject Keyword	Journal of Glaciology Petroleum Engineering Ice Coring Ice Engineering Polar Firn
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes

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