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2020 Vol.30, Issue 3 Preview Page

Research Article

Estimating Exploitable Groundwater as a Function of Precipitation Using a Distributed Hydrologic Model and Frequency Analysis

분포형 수문모형과 빈도해석을 이용한 강수량별 지하수 개발가능량 산정

Minsoo Kim1
,
Gyocheol Jeong2
,
Jeong Eun Lee3
,
Min-Gyu Kim14*
김 민수1
,
정 교철2
,
이 정은3
,
김 민규14*
1Ph.D. Student, Department of Earth and Environmental Science, Andong National University
2Professor, Department of Earth and Environmental Science, Andong National University
3Senior Researcher, Department of Land, Water and Environment Research, KICT
4Research Specialist, Department of Land, Water and Environment Research, KICT
1안동대학교 지구환경과학과 박사과정
2안동대학교 지구환경과학과 교수
3한국건설기술연구원 국토보전연구본부 수석연구원
4한국건설기술연구원 국토보전연구본부 전임연구원
*Corresponding Author
30 September 2020. pp. 253-268
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Abstract

In this study, recharge rates are estimated using SWAT-K (a distributed hydrological model). The validity of the estimated recharge rates were evaluated by employing the baseflow separation method based on observed hydrological data. The exploitable groundwater is typically determined as the 10-year drought frequency recharge rate that is calculated by average recharge ratio multiplied by 10-year drought frequency precipitation. In practice, however, recharge rates typically decrease in line with precipitation; therefore, exploitable groundwater could be overestimated when average recharge rates are used without considering precipitation. To resolve this overestimation, exploitable groundwater was calculated by re-estimating recharge rates that consider precipitation intensity. By applying this method to the Uiwang, Gwacheon, and Seongnam sub-basins, the exploitable groundwater decreased by 55.5~77.6%, compared with recharge rates obtained using the existing method.

Keywords
distributed hydrologic model
frequency analysis
exploitable groundwater
groundwater recharge
SWAT-K
precipitation

본 연구에서는 분포형 수문모형 SWAT-K를 사용한 함양률을 산정하고 이를 뒷받침하기 위해 유역 내에서 실제로 관측한 수문곡선 자료를 기반으로 기저유출 분리법을 이용하여 함양량 산정의 타당성을 평가하였다. 통상 지하수 개발가능량 산정 시 10년 빈도 갈수 시 강수량에 평균함양률을 곱하여 실무에 활용하고 있으나, 실제로 함양률은 강수량이 작을수록 작아지는 경향을 보이기 때문에 평균 함양률을 사용하게 되면 개발가능량이 과다 산정될 가능성이 높다. 이러한 문제를 해결하기 위해서 본 연구에서는 강수량 규모를 고려한 함양량으로 함양률을 재산정하여 개발가능량을 산정하였다. 이 방법을 의왕 ‧ 과천 ‧ 성남시에 적용한 결과 소유역별 개발가능량은 기존 방법 대비 55.5~77.6%로 감소하는 것으로 나타났다.

키워드
분포형 수문모형
빈도해석
지하수 개발가능량
지하수 함양량
SWAT-K
강수량
References
1
Arnold, J.G., Allen, P.M., Bernhardt, G., 1993, A comprehensive surface-groundwater flow model, Journal of Hydrology, 142(1-4), 47-69.
10.1016/0022-1694(93)90004-S
2
Chung, I.M., Kim, N.W., Lee, J., Lee, J.E., 2014, A method of estimating conservative potential amount of groundwater, Journal of The Korean Society of Civil Engineers, 34(6), 1797-1806.
10.12652/Ksce.2014.34.6.1797
3
Chung, I.M., Lee, J., Kim, N.W., 2011, Estimating exploitable groundwater amount in musimcheon watershed by using an integrated surface water-groundwater model, Economic and Environmental Geology, 44(5), 433-442 (in Korean with English abstract).
10.9719/EEG.2011.44.5.433
4
Chung, I.M., Lee, J., Lee, J.E., Kim, M.S., 2019, Method of estimating exploitable groundwater amount considering relationship between precipitation and recharge and the variation of 10-year minimum precipitation, Journal of Korea Water Resources Association, 52(6), 421-427 (in Korean with English abstract).
5
Hosking, J.R.M., 1990, L-Moments: analysis and estimation of distributions using linear combinations of order statistics, Journal of the Royal Statistical Society, Series B, 52(1), 105-124.
10.1111/j.2517-6161.1990.tb01775.x
6
Kim, N.W., Chung, I.M., Kim, C., Lee, J., Lee., J.E., 2009, Development and applications of SWAT-K (Korea), In: Arnold, J. et al. (Eds.), Soil and Water Assessment Tool (SWAT) Global Applications, Special Publication No. 4, World Association of Soil and Water Conservation, Bangkok, Thailand.
7
MOCT (Ministry of Construction and Transportation), 2002, Groundwater management basic plan.
8
ME (Ministry of Environment), 2018, Basin groundwater investigation at Uiwang, Gwacheon, and Seongnam region.
9
ME (Ministry of Environment), 2019, Guidelines of integrated groundwater survey and groundwater map production and management, 174p.
10
MOLIT (Ministry of Land, Infrastructure and Transport), 2017, Groundwater management basic plan.
11
Nathan, R.J., McMahon, T.A., 1990, Evaluation of automated techniques for base flow and recession analyses, Water Resources Research, 26(7), 1465-1473.
10.1029/WR026i007p01465
12
Neitsch, S.L., Arnold, J.G., Kiniry, J.R., Williams, J.R., 2001, Soil and water assessment tool version 2000, Agricultural Research Service, Texas Agricultural Experiment Station, Temple, Texas.
Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 30
  • No :3
  • Pages :253-268
  • Received Date : 2020-08-04
  • Revised Date : 2020-08-17
  • Accepted Date : 2020-08-18
  • DOI :https://doi.org/10.9720/kseg.2020.3.253
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