Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Combined Effects of Groundwater Abstraction and Irrigation Reservoir on Streamflow

지하수 이용과 농업용 저수지가 하천유량에 미치는 복합 영향

  • Kim, Nam Won (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology) ;
  • Lee, Jeongwoo (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology) ;
  • Chung, Il Moon (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology) ;
  • Lee, Min Ho (Han River Flood Control Office)
  • 김남원 (한국건설기술연구원 수자원연구실) ;
  • 이정우 (한국건설기술연구원 수자원연구실) ;
  • 정일문 (한국건설기술연구원 수자원연구실) ;
  • 이민호 (한강홍수통제소 하천정보센터)
  • Received : 2013.02.14
  • Accepted : 2013.04.18
  • Published : 2013.07.31
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Abstract

In this study, a watershed-based surface-water and groundwater integrated model, SWAT-MODFLOW was used to evaluate streamflow depletion induced by groundwater withdrawals and irrigation reservoirs for the Juksan-cheon watershed in South Korea. The streamflow responses to groundwater pumping and irrigation reservoirs were simulated under several different scenarios. The scenarios were (1) current pumping well withdrawals with reservoirs; (2) current pumping well withdrawals without reservoirs; (3) no pumping well withdrawals with reservoirs; (4) no pumping well withdrawals without reservoirs (natural condition). The simulated results indicated that the effects of groundwater pumping on streamflow depletion are a little more significant than those of irrigation reservoirs. Particularly, the groundwater withdrawals with irrigation reservoirs at current status (scenario 1) has induced the decrease of more than 20% in drought flow against the natural condition (scenario 4) at the outlet of the watershed. The specific drought flows through the main stream of Juksan-cheon watershed were simulated in order to assess the irrigation effects on downstream flows. It was found out that the specific drought flows are increasing as the distance from the reservoir increases due to the accumulation of the return flows to stream.

본 연구에서는 죽산천 유역에 대해 지표수와 지하수의 통합거동을 유역 스케일로 장기간 모의할 수 있고 양수정의 공간분포 및 저수지 운영을 복합적으로 고려할 수 있는 유역단위 통합수문해석모형 SWAT-MODFLOW를 적용하여 지하수 양수 및 농업용 저수지가 하천유량에 미치는 영향을 평가하였다. 지하수 양수 및 농업용저수지 고려 유무에 따라 4가지 시나리오(1) 현 지하수 이용량 고려, 저수지 고려, (2) 현 지하수 이용량 고려, 저수지 미고려, (3) 지하수 이용량 미고려, 저수지 고려), (4) 지하수 이용량 미고려, 저수지 미고려(자연상태)를 구성하고 각 시나리오별로 하천유량의 변화를 모의한 결과, 죽산천 유역 출구부를 기준으로 지하수 양수로 인한 영향이 농업용 저수지에 의한 영향보다 상대적으로 크게 발생하였으며, 갈수량은 용수이용이 없는 자연 상태(natural flow)에 비해서 지하수 양수만의 영향으로 약 17%, 저수지만의 영향으로 약 11%, 양수 및 저수지의 복합영향으로 인해 약 23% 만큼 감소하는 것으로 분석되었다. 농업용 저수지로부터 떨어진 거리에 따른 하천유량의 변화를 평가하기 위해서 죽산천 본류를 따라 비갈수량을 산정한 결과, 저수지 관개용수의 회귀수 영향으로 하류로 내려갈수록 비갈수량이 증가하였으며, 죽산천 상류에 위치한 덕산 저수지로부터 약 6.5 km까지는 저수지의 영향이 상당히 미치는 것으로 분석되었다.

Keywords

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