KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Improvement of Water Supply Capability of the Nakdong River Basin Dams with Weirs

보를 포함한 낙동강 다목적댐 용수공급능력 개선에 관한 연구

  • 장철호 (한국수자원공사) ;
  • 김영오 (서울대학교 공과대학 건설환경공학부)
  • Received : 2016.02.22
  • Accepted : 2016.06.23
  • Published : 2016.08.01
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Abstract

This study sought to reevaluate the water supply capacities of the Nakdong river dams, and identify measures to remedy any shortages using weirs, focusing on 5 multipurpose dams and 8 weirs. The reevaluation of the dams was performed by the HEC-5 program using the original design criteria and inflow data recorded for each dam. The results show that the capacities of the 3 dams has decreased to 73~87%. Three simulations were performed to determine the effect of coordinating the dams and weirs. The first simulation was based on individual operation of the dams; the second on coordinated operation of the dams; and the third on coordinated operation of the dams and weirs. To obtain a water supply reliability of 95%, the annual water shortage was calculated for a 20-year period (1992~2011). In addition, long-term runoff simulation data used in the national river basin investigation by the Ministry of Land, Infrastructure and Transportation were used with the dam discharge data, because long-term inflow data for the weirs were not available. The simulations were performed by the HEC-ResSim program, with the reservoir network divided into 2 groups based on the Waegwan water station. The results show that water supply capacity for the 3 simulations to be $2424Mm^3/yr$, $2612Mm^3/yr$ and $2734Mm^3/yr$, respectively. This indicates that coordinated operation of the dams and weirs could provide an additional water supply of $122Mm^3/yr$.

본 연구에서는 낙동강수계 다목적댐의 용수공급능력을 재평가해보고, 감소된 공급능력을 보완하기 위한 방안으로 '보'를 포함한 용수공급능력과 연계운영 방안을 검토하였다. 연구 대상은 낙동강 5개 다목적댐(안동, 임하, 합천, 남강, 밀양)과 8개 보(상주, 낙단, 구미, 칠곡, 강정고령, 달성, 합천창녕, 창녕함안)로 하였다. 먼저, 기존댐의 용수공급능력 재평가는 각 댐의 설계당시 평가 기준을 준용하여 HEC-5로 모의하였으며, 입력 자료는 준공 이후 각 댐별로 축적된 유입량 자료를 활용하였다. 모의 결과, 3개 댐의 공급능력이 73~87% 수준으로 감소했음을 확인할 수 있었다. 보를 포함한 용수공급능력의 효과를 확인하기 위해서, 각 댐별 모의, 댐간 연계운영 모의, 댐-보 연계운영 모의 등 세가지 case에 대해 HEC-ResSim 모형을 활용하여 비교 검토하였다. 이수안전도 95%를 적용하기 위해 20개년(1992~2011년) 중 1회 물부족을 허용하는 것으로 하였으며, 보는 축적된 유입량 자료가 없어, 전국유역조사(국토교통부)의 장기유출 모의자료(PRMS)에 댐 방류량 자료를 결합하여 활용하였다. 연계운영 모의시 왜관 수위표 지점을 기준으로 낙동강 상 하류를 구분하여 연계운영 네트워크를 구성하였다. 3가지 case에 대한 모의 결과, 댐별 운영시 24억$m^3$/년, 댐간 연계운영시 26억$m^3$, 댐-보 연계운영시 27억$m^3$/년의 용수공급이 가능한 것으로 평가되었다. 즉, 보를 포함하여 용수공급을 할 경우 연간 1.2억$m^3$ 가량의 추가 공급이 가능하여, 댐 설계당시 용수공급 계획량(27억$m^3$/년)과 같은 수준의 공급이 가능할 것으로 판단된다.

Keywords

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