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Research Article

Determination of Hydraulic Conductivities in the Sandy Soil Layer through Cross Correlation Analysis between Rainfall and Groundwater Level

강우-지하수위 상관성 분석을 통한 사질토층의 수리전도도 산정

Seunghyuk Park1
,
Doo Gie Son2
,
Gyo-Cheol Jeong3*
박 승혁1
,
손 두기2
,
정 교철3*
1Deputy General Manager, JoongangConsultant Co., Ltd.
2Director, JoongangConsultant Co., Ltd.
3Professor, Department of Earth and Environmental Sciences, Andong National University
1중앙컨설턴트(주) 차장
2중앙컨설턴트(주) 이사
3안동대학교 지구환경과학과 교수
*Corresponding Author
30 September 2019. pp. 303-314
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Abstract

Surface permeability and shallow geological structures play significant roles in shaping the groundwater recharge of shallow aquifers. Surface permeability can be characterized by two concepts, intrinsic permeability and hydraulic conductivity, with the latter obtained from previous near-surface geological investigations. Here we propose a hydraulic equation via the cross-correlation analysis of the rainfall- groundwater levels using a regression equation that is based on the cross-correlation between the grain size distribution curve for unconsolidated sediments and the rainfall-groundwater levels measured in the Gyeongju area, Korea, and discuss its application by comparing these results to field-based aquifer test results. The maximum cross-correlation equation between the hydraulic conductivity derived from Zunker’s observation equation in a sandy alluvial aquifer and the rainfall-groundwater levels increases as a natural logarithmic function with high correlation coefficients (0.95). A 2.83% difference between the field-based aquifer test and root mean square error is observed when this regression equation is applied to the other observation wells. Therefore, rainfall-groundwater level monitoring data as well as aquifer test are very useful in estimating hydraulic conductivity.

Keywords
shallow aquifer
hydraulic conductivity
unconsolidated deposit
maximum cross correlation coefficient (CCFmax)
rainfall-groundwater level monitoring

얕은 대수층에서 매우 복잡한 함양과정을 거치는 지하수의 함양은 지표와 지하매질의 투수성에 의해 상당한 영향을 받는다. 투수성은 고유투수계수(intrinsic permeability)와 수리전도도(hydraulic conductivity)의 두 가지 개념으로 설명되며 이중 지표매질의 특성만으로 수리전도도를 구하려는 많은 연구가 이루어졌다. 본 연구에서는 경주지역 지하수기초조사에서 수행된 미고결퇴적물의 입도분포곡선과 강우-지하수위 교차상관분석을 토대로 회귀식을 사용하여 강우-지하수위 교차상관분석을 통한 수리전도도 산정식을 제안하고 실제현장에서 수행한 대수성 시험결과와 비교하여 그 적용성을 검토하였다. 그 결과 사질토 기반 충적층대수층에서 Zunker의 경험식에서 산정된 수리전도도와 강우-지하수위 최대 교차상관계수의 상관식이 자연로그형태로 증가하면서 결정계수 0.95 이상으로 매우 큰 상관성을 나타내었고 이 회귀식을 다른 관측공에 적용한 결과 실제 현장에서 수행한 대수성시험결과와 평균제곱근오차가 2.83%로 나타나 강우-지하수위 모니터링 자료만으로 매우 신뢰할 만한 수리전도도를 추정할 수 있었다.

키워드
얕은 대수층
수리전도도
미고결퇴적물
최대교차상관계수
강우-지하수위 모니터링
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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 :303-314
  • Received Date : 2019-09-02
  • Accepted Date : 2019-09-11
  • DOI :https://doi.org/10.9720/kseg.2019.3.303
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