KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Estimation of Exploitable Groundwater in the Jinju Region by Using a Distributed Hydrologic Model

분포형 수문모형을 이용한 진주지역의 지하수 개발가능량 추정

  • Lee, Jeong Eun (Korea Institute of Civil engineering and building Technology) ;
  • Chung, Il-Moon (Korea Institute of Civil engineering and building Technology) ;
  • Lee, Jeongwoo (Korea Institute of Civil engineering and building Technology) ;
  • Kim, Min Gyu (Korea Institute of Civil engineering and building Technology)
  • 이정은 (한국건설기술연구원 수자원하천연구본부) ;
  • 정일문 (한국건설기술연구원 수자원하천연구본부) ;
  • 이정우 (한국건설기술연구원 수자원하천연구본부) ;
  • 김민규 (한국건설기술연구원 수자원하천연구본부)
  • Received : 2021.09.01
  • Accepted : 2021.09.29
  • Published : 2021.12.01
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Abstract

This study aimed to estimate exploitable groundwater for the sustainable supply of groundwater in the Jinju region of South Gyeongsang Province. As an integrated hydrologic analysis model, SWAT-MODFLOW was used to estimate the distributed groundwater recharge in consideration of land use and soil distribution. As a result of calibration of the model, the coefficient of determination between the observed flow and the simulated flow was 0.75-0.80, which was good. The simulated groundwater recharge rate showed a spatio-temporal distribution due to heterogeneous watershed characteristics. The amount of groundwater recharge shows lower values over winter and spring, but it increases according to the pattern of precipitation in summer and autumn. The calculated average annual groundwater recharge was compared with the result using the baseflow separation method of natural flow, and the deviation of both results was small, within 3 %, confirming the validity of the estimated groundwater recharge. Exploitable groundwater is defined as the amount of recharge corresponding to low flow with 10 years of return period. Therefore, in this study, 14.2 % of the annual precipitation was found to be exploitable as a result of calculating the amount of recharge at a 10-year frequency using a statistical frequency analysis technique.

본 연구에서는 진주지역의 지속가능한 지하수 공급을 위한 지하수 개발가능량을 추정하고자 한다. 토지이용, 토양분포 등을 고려한 분포형 함양량을 산정하기 위해 통합수문해석 모형인 SWAT-MODFLOW를 사용하였다. 모형의 검보정 결과 관측유량과 모의유량치와 모의치의 결정계수가 0.75 ~ 0.80으로 양호하게 나타났다. 계산된 지하수 함양량은 시공간적 분포를 나타내며 겨울과 봄에 걸쳐 낮은 함양량을 나타내나 여름과 가을에는 함양량이 강수량의 패턴에 따라 증가하는 것을 알 수 있었다. 계산된 연평균 함양량을 자연유량의 기저유출 분리법을 이용한 결과와 비교하였으며 편차는 3 %내로 적게 나타나 추정된 함양량의 타당성을 확인할 수 있었다. 지하수 개발가능량은 10년빈도 갈수시의 함양량으로 규정하고 있어 본 연구에서는 통계학적 빈도해석 기법을 이용하여 10년빈도 갈수시의 함양량을 산정한 결과 연 강수량의 14.2 %가 개발가능한 양으로 나타났다.

Keywords

Acknowledgement

본 연구는 환경부 대행사업인 "진주지역 통합 지하수 기초조사"의 연구성과입니다.

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