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J. Korean Soc. Hazard Mitig. > Volume 18(7); 2018 > Article
Journal of the Korean Society of Hazard Mitigation 2018;18(7):555-562.
DOI: https://doi.org/10.9798/KOSHAM.2018.18.7.555    Published online December 31, 2018.
K-DRUM과 MODFLOW를 연계한 장기유출량 정확도 개선
허영택1, 박구영2, 박진혁3, 김형산4
1정회원, K-water융합연구원 책임연구원
2정회원, K-water 물순환사업처 사원
3정회원, K-water융합연구원 수석연구원
4정회원, K-water융합연구원 위촉선임연구원
Improvement of the Long-term Discharge Simulation Linked with K-DRUM and MODFLOW
Young Teck Hur1, Gu Young Park2, Jin Hyeog Park3, Hyung San Kim4
1Member, Principal Researcher, K-water Convergence Institute, K-water
2Member, Staff, Integrated Water Cycle Business Department, K-water
3Member, Head Researcher, K-water Convergence Institute, K-water
4Member, Postdoctoral Research Associate, K-water Convergence Institute, K-water
Corresponding author:  Hyung San Kim, Tel: +82-42-870-7482, Fax: +82-42-870-7499, 
Email: hskim@kwater.or.kr
Received: 2 October 2018   • Revised: 8 October 2018   • Accepted: 17 October 2018
Abstract
In this study, the K-DRUM (K-water Distribution Runoff Model), which is a distributed rainfall runoff model, and MODFLOW (a Modular Three-Dimensional Finite-Difference Ground Water Flow Model) are linked to improve the accuracy of base flow. The K-DRUM model and MODFLOW model are set to share the terrain, boundary condition, and input/output data as a grid-based model. The model linkage has shown that the PBIAS has been improved from satisfactory to very good, especially with a distinct improvement in base flow. As a result, it is possible to compensate the difficulties of spatiotemporal distribution of recharge, which is a disadvantage of groundwater flow, and can be utilized in water impact assessment through long-term runoff analysis according to future climate change scenarios.
Key Words: K-DRUM, MODFLOW, Long-term Runoff Analysis, Model Linkage, Baseflow
요지
본 연구에서는 분포형 강우유출모형인 K-DRUM (K-water Distribution Runoff Model)과 3차원 지하수 유동 모형인 MODFLOW (A Modular Three-Dimensional Finite-Difference Ground Water Flow Model)를 연계하여 장기유출분석을 위한 기저유출량의 정확도를 향상시키고자 하였다. K-DRUM모형과 MODFLOW모형은 격자기반 모형으로 지형, 경계조건 및 입출력자료를 공유하 도록 설정하였으며, 모형 간 연계를 통해 PBIAS가 충분함에서 매우 좋음으로 향상되었고 특히 기저유출량이 뚜렷하게 개선되었 음이 확인되었다. 결과적으로, 강우유출모형의 단점인 지하수유동과 지하수유동모형의 단점인 함양량의 시공간적 분포의 어려움을 상호 보완할 수 있었으며, 향후 기후변화 시나리오에 따른 장기유출분석을 통해 수자원 영향평가에 활용될 수 있을 것으로 사료된다.
핵심용어: K-DRUM, MODFLOW, 장기유출분석, 모형연계, 기저유출
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