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2019 Vol.39, Issue 6 Preview Page

Geotechnical Engineering

A Study on the Lunar Ground Temperature Profile for Investigation of Possible Condition of the Ice Layer Existence in Sub-surface of the Moon

달 지하 얼음 층 존재 가능조건 검토를 위한 달 지반 온도 프로파일 산정 연구

Gyu-Hyun Go1
Jangguen Lee2
Hyu-Soung Shin3*
고 규현1
이 장근2
신 휴성3*
1Kumoh National Institute of Technology
2Korea Institute of Civil Engineering and Building Technology
3Korea Institute of Civil Engineering and Building Technology
1금오공과대학교 토목공학과 조교수
2한국건설기술연구원 미래융합연구본부 연구위원
3한국건설기술연구원 미래융합연구본부 본부장
* Corresponding Author
December 2019. pp. 801-809
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Abstract

2009년 NASA에서 수행된 달 극지 탐사 미션을 통해 달 극지의 영구음영지역에 얼음 층이 존재한다는 증거가 발견되었다. 이후, 달 극지 지역 얼음 층 탐사를 위한 지반 특성 평가 연구들이 국내외적으로 활발히 이루어지고 있다. 본 연구에서는 달 영구음영지역의 지반온도변화를 예측하고, 얼음 층이 지반 온도 프로파일에 미치는 영향을 정량적으로 평가하고자 달 지반에 대한 비정상 상태 열 해석을 수행하였다. 수치해석결과를 통해 위도 86°이상에서 달 지반 내부의 온도가 얼음승화 기준온도인 112 K 이하로 수렴한다는 것을 확인하였고, 이는 달 극지 내 얼음 층이 존재하고 있을 가능성이 높은 지역을 확률적으로 판단할 수 있는 근거가 되었다. 얼음 층이 매장되어 있는 깊이에 따라 지반 온도 프로파일에 미치는 영향정도가 다르게 나타났는데, 온도 편차가 큰 얕은 심도에 존재하는 얼음 층은 이질적인 온도분포 특성을 초래한다는 사실을 확인하였다. 또한, 본 연구는 매장된 얼음의 상을 보존하도록 하는 드릴 비트의 최대 허용 마찰열에 대해서 고찰하였다.

키워드
달극지탐사
영구음영지역
열전달해석
얼음층
지반온도프로파일

NASA’s lunar polar exploration mission in 2009 confirmed the presence of ice-layer in the permanently shadowed regions (PSR) of the moon. Since then, studies have been actively conducted to evaluate the ground characteristics for exploring the ice-layer in the polar regions of the Moon. In this study, transient heat transfer analysis for the lunar ground was conducted to predict the ground’s temperature that varies with the time and location. As a result of the numerical analysis, it was confirmed that the temperature under the lunar ground converged to below the ice sublimation reference temperature (≒112 K) at above 86° latitude. This model enabled us to identify the regions where there is a high possibility of ice being buried. Besides, we found that the ice-layer in the shallow region, where the temperature deviation is significant, makes ground temperature distribution heterogeneous. Lastly, this study suggested the maximum allowable frictional heat of a drill bit that can preserve the phase of buried ice.

Keywords
Lunar pole exploration
Permanently shadowed regions
Heat transfer analysis
Ice-layers
Ground temperature profile
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Information
  • Publisher :Korean Society of Civil Engineers
  • Publisher(Ko) :대한토목학회
  • Journal Title :KSCE JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING RESEARCH
  • Journal Title(Ko) :대한토목학회 논문집
  • Volume : 39
  • No :6
  • Pages :801-809
  • Received Date :2019. 08. 06
  • Revised Date :2019. 09. 25
  • Accepted Date : 2019. 11. 04
  • DOI :https://doi.org/10.12652/Ksce.2019.39.6.0801
Journal Informaiton Agriculture and Life Sciences Research Institute KSCE JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING RESEARCH
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