Preliminary Evaluation of the Optimal Injection Rate and Injection Efficiency of Groundwater Artificial Recharge Site Using Numerical Model

Jang-Hwan Cha; Gyoo-Bum Kim; Jae Young Lee

doi:10.9720/kseg.2021.1.019

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2021 Vol.31, Issue 1 Preview Page Next Page

Research Article

Preliminary Evaluation of the Optimal Injection Rate and Injection Efficiency of Groundwater Artificial Recharge Site Using Numerical Model 수치모델을 활용한 지하수 인공함양 대상지의 적정 주입량 및 주입효율 예비 평가

31 March 2021. pp. 19-30

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Abstract

This study evaluated the injection rate and the injection efficiency of the artificial recharge in the upper drought-prone watershed region, where the remaining water was used for injection, by using a numerical model to secure water during a drought. As a result of a numerical model under the condition of diverse injection rates per a well and hydraulic characteristics of the aquifer, the optimal injection rate per a well was estimated as 50.0 m³/day, and the injection efficiency was simulated as 33.2% to 81.2% of the total injection volume. As the injection time was shorter, the injection efficiency tented to increase non-linearly. As the injection rate increased, the residual storage in aquifer increased and available groundwater amount also increased, which could be advantageous for drought relief. For a more accurate assessment of injection efficiency, the model will be validated using the field injection data and optimum scenarios will enable the efficient operation of the artificial recharge system in the study area.

Keywords

artificial recharge

injection efficiency

numerical model

recharge scenario

본 연구에서는 가뭄이 빈번히 발생하는 지류 상류 지역에서 농번기에 부족한 물을 확보하기 위하여 평상시 잉여의 물을 지하 대수층에 주입하는 인공함양 방식을 설계함에 앞서 적정 주입량 및 주입효율을 수치모델을 활용하여 평가하고자 하였다. 인공함양 수치모델 대상지역은 홍성군 갈산면 운곡리 일대를 대상으로 하였으며 다양한 공당 주입량 조건과 대수층의 수리적 특성을 고려하여 모델링을 수행한 결과, 연구지역의 공당 적정주입량은 50.0 m³/day/공로 평가되었으며 주입효율은 총 주입용량 대비 33.2~81.2%로 예측되었다. 특히, 주입효율은 주입시간이 짧을수록 비선형으로 증가하는 양상을 보였으며 잔류 저류용량은 총 주입용량이 많을수록 증가하여 물부족 시 사용 가능량이 많아지므로 보다 유리할 것으로 보였다. 향후 보다 정확한 함양효율 평가를 위해 현장 실증시험 결과를 활용하여 모델을 검증하고 이를 통해 주입 및 취수에 대한 적정 시나리오를 구축한다면 보다 효율적인 인공함양 시스템의 운영이 가능할 것이다.

키워드

인공함양

주입효율

수치모델

함양 시나리오

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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 : 31
No :1
Pages :19-30
Received Date : 2020-12-09
Revised Date : 2021-01-23
Accepted Date : 2021-01-25
DOI :https://doi.org/10.9720/kseg.2021.1.019

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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