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2019 Vol.29, Issue 3 Preview Page

Research Article

Study of Groundwater Recharge Rate Change by Using Groundwater Level and GRACE Data in Korea

지하수위와 GRACE 자료를 이용한 국내 지하수 함양량 변화 연구

Hang-Tak Jeon1
,
Se-Yeong Hamm2*
,
Young-Heon Jo3
,
Jinsoo Kim4
,
Soyoung Park5
,
Jae-Yeol Cheong6
전 항탁1
,
함 세영2*
,
조 영헌3
,
김 진수4
,
박 소영5
,
정 재열6
1Doctoral Student, Department of Geological Sciences, Pusan National University
2Professor, Department of Geological Sciences, Pusan National University
3Professor, Department of Oceanography, Pusan National University
4Professor, Department of Spatial Information Engineering, Pukyong National University
5Research Professor, BK21 Plus Project of the Graduate School of Earth Environmental Hazard System, Pukyong National University
6Director, Safety Assessment Team, Korea Radioactive Waste Agency
1부산대학교 지질환경과학과 박사수료생
2부산대학교 지질환경과학과 교수
3부산대학교 해양학과 교수
4부경대학교 공간정보학과 교수
5부경대학교 BK21 지구환경재해사업단 연구교수
6한국원자력환경공단 안전평가팀 팀장
*Corresponding Author
30 September 2019. pp. 265-277
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Abstract

Changes in the amount, intensity, frequency, and type of precipitation, in conjunction with global warming and climate change, critically impact groundwater recharge and associated groundwater level fluctuations. Monthly gravity levels by the Gravity Recovery and Climate Experiment (GRACE) are acquired to monitor total water storage changes at regional and global scales. However, there are inherent difficulties in quantitatively relating the GRACE observations to groundwater level data due to the difficulties in spatially representing groundwater levels. Here three local interpolation methods (kriging, inverse distance weighted, and natural neighbor) were implemented to estimate the areal distribution of groundwater recharge changes in South Korea during the 2002-2016 period. The interpolated monthly groundwater recharge changes are compared with the GRACE-derived groundwater storage changes. There is a weak decrease in the groundwater recharge changes over time in both the GRACE observations and groundwater measurements, with the rate of groundwater recharge change exhibiting mean and median values of -0.01 and -0.02 cm/month, respectively.

Keywords
groundwater level
GRACE
climate change
groundwater recharge change
interpolation methods

지구 온난화에 따른 기후 변화, 강수량, 강우 강도, 빈도 그리고 강우 유형의 변화는 지하수 함양과 지하수위 변동에 큰 영향을 미친다. 전 세계적인 총 저수량 변화를 파악하는데, GRACE의 월 중력값 이용되어지고 있다. 그러나 지하수위의 공간적인 분포를 표현하기가 쉽지 않으므로, GRACE자료와 지하수위 자료를 정량적으로 연관시키기는 쉽지 않다. 본 연구에서는 세 가지 국지적인 보간법(크리깅, 역 거리 가중값 및 자연 인접)을 이용하여 2002년부터 2016년 까지 국내 지하수 함양 변화량의 공간적인 분포를 추정하였다. 그리고 추정된 월평균 지하수 함양 변화량과 GRACE의 월별 지하수 저장량 변화값을 비교하였다. GRACE자료와 실측 지하수자료의 함양량 변동값은 미약하지만 시간이 경과할수록 감소추세를 보이고 있으며, 연구기간 동안에 지하수 함양 변화량의 평균값은 -0.01 cm/month, 중앙값은 -0.02 cm/month로 산정되었다.

키워드
지하수위
GRACE
기후변화
지하수 함양 변화량
보간법
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 29
  • No :3
  • Pages :265-277
  • Received Date : 2019-08-22
  • Revised Date : 2019-09-06
  • Accepted Date : 2019-09-10
  • DOI :https://doi.org/10.9720/kseg.2019.3.265
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