The Ministry of Environment is determining reference flows and goal water qualities in many stations over all around riverbasin to control TMDL. Reference flow is now defined to 10 years averaged 275th minimum flow$(Q_{275})$. Dam operation takes direct effect on flows downstream. The Yon...
The Ministry of Environment is determining reference flows and goal water qualities in many stations over all around riverbasin to control TMDL. Reference flow is now defined to 10 years averaged 275th minimum flow$(Q_{275})$. Dam operation takes direct effect on flows downstream. The Yongdam mutipurposed dam was constructed in 2002 and TMDL managing stations between the Daecheong dam and the Yongdam dam are the Geumbon B, C, D, E, and F in main stream of the Geum river. Geumbon F is the Daecheong dam site. Observed flows are ideal to be used to set reference flows, but simulated flows are more practical to be used to set reference flows from the cause of the Yongdam dam's operation. A system for simulating daily storages of the Yongdam dam was constructed and the DAWAST model was selected to simulate daily streamflows. Analysis period was selected for 10 years from 1996 to 2005. Scenario was set as follows; Firstly, observed outflows from the Yongdam dam are used from 2002 to 2005 and the Yongdam dam does not exist from 1995 to 2001. Secondly, the Yongdam dam existed also from 1995 to 2001 and simulated outflows from the Yongdam dam are used from 1996 to 2005 with provision of constant outflow of $7.0m^3/s$ and water supply to the Jeonju region outsided watershed of $900,000m^3/day$. In case of scenario 1 reference flows at the Geumbon B, C, D, E, F are 4.52, 6.69, 7.96, 11.17, and $13.21m^3/s$, respectively. And in case of scenario 2 reference flows at the Geumbon B, C, D, E, F are 6.27, 8.48, 9.58, 12.73, and $15.12m^3/s$, respectively.
The Ministry of Environment is determining reference flows and goal water qualities in many stations over all around riverbasin to control TMDL. Reference flow is now defined to 10 years averaged 275th minimum flow$(Q_{275})$. Dam operation takes direct effect on flows downstream. The Yongdam mutipurposed dam was constructed in 2002 and TMDL managing stations between the Daecheong dam and the Yongdam dam are the Geumbon B, C, D, E, and F in main stream of the Geum river. Geumbon F is the Daecheong dam site. Observed flows are ideal to be used to set reference flows, but simulated flows are more practical to be used to set reference flows from the cause of the Yongdam dam's operation. A system for simulating daily storages of the Yongdam dam was constructed and the DAWAST model was selected to simulate daily streamflows. Analysis period was selected for 10 years from 1996 to 2005. Scenario was set as follows; Firstly, observed outflows from the Yongdam dam are used from 2002 to 2005 and the Yongdam dam does not exist from 1995 to 2001. Secondly, the Yongdam dam existed also from 1995 to 2001 and simulated outflows from the Yongdam dam are used from 1996 to 2005 with provision of constant outflow of $7.0m^3/s$ and water supply to the Jeonju region outsided watershed of $900,000m^3/day$. In case of scenario 1 reference flows at the Geumbon B, C, D, E, F are 4.52, 6.69, 7.96, 11.17, and $13.21m^3/s$, respectively. And in case of scenario 2 reference flows at the Geumbon B, C, D, E, F are 6.27, 8.48, 9.58, 12.73, and $15.12m^3/s$, respectively.
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문제 정의
본 연구에서는 용담댐의 운영 시나리오를 설정하고, 하류하천의 수질총량 관리지점별로 유량을 생산하여 합리적인 기준유량을 설정하고자 한다.
제안 방법
연구방법은 첫째, 용담댐 저수량 모의 모형을 구축하고 둘째, 일 유출 모형을 선정하고 셋째, 용담댐 운영 시나리오를 설정하고 넷째, 시나리오별로 지점별 기준유량을 산정하는 것으로 하였다.
대상 데이터
연구자료는 유역내의 우량, 유량, 댐운영 자료 등이고, 자료기간은 1996년부터 2005년까지로 하였다. 연구방법은 첫째, 용담댐 저수량 모의 모형을 구축하고 둘째, 일 유출 모형을 선정하고 셋째, 용담댐 운영 시나리오를 설정하고 넷째, 시나리오별로 지점별 기준유량을 산정하는 것으로 하였다.
성능/효과
본 연구에서는 용담댐의 운영에 따른 영향을 분석하였으며, 용담댐에서 대청댐 사이의 용담댐 하류 하천의 수질총량 관리지점에서 기준 유량이 1.56~1.91m3/s 로 증가하였다.
후속연구
전국 수계에 맑은 물을 흐르게 하여 국민의 삶의 질을 향상시키기 위한 수질오염총량제의 실시에 따라 수질이 많이 개선될 것으로 기대한다. 수계별로 댐이 많이 있으며, 댐의 운영에 따라 하류의 유량이 영향을 받기 때문에 이를 충분히 고려하여야 한다.
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