• Title/Summary/Keyword: Andong-Imha diversion tunnel

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Computational Fluid Dynamics Simulation of Flow Pattern Change in the Andong-Imha Reservoir Connecting Tunnel Due to Fish Exclusion Screens (어류 차단 스크린 설치에 따른 안동-임하호 연결터널 내 흐름변화에 대한 전산유체동역학 수치모의)

  • An, Sangdo
    • Journal of Korean Society on Water Environment
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    • v.30 no.5
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    • pp.477-485
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    • 2014
  • Imha Reservoir is connected to Andong Reservoir via a diversion tunnel allowing water to pass between. The diversion tunnel is equipped with screens to exclude exotic largemouth bass due to their predatory impacts on prey assemblages resulting in a degradation of species richness of local fish fauna and extinction of local fish populations in Korea. Flow pattern changes resulting from the fish screens and trash racks were investigated using a computational fluid dynamics (CFD) model. Numerical simulations showed that the decrease in the discharge capacity of the tunnel is approximately 8.6% and the headloss coefficient for fish screen at Andong intake tower was determined to be 1.5. In order not to allow the small fishes enough to pass through the wire openings enter into Imha Reservoir through tunnel, the velocity in the tunnel should be greater than 1.48 m/s which is a critical ascending velocity of the bass. This study suggests that it can keep the velocity higher enough to exclude largemouth bass when a gate opens with the condition of 1.0m difference in water stage between two reservoirs.

Study on Potential Water Resources of Andong-Imha Dam by Diversion Tunnel (안동-임하 연결도수로 설치에 따른 가용 수자원량에 관한 연구)

  • Choo, Yeon Moon;Jee, Hong Kee;Kwon, Ki Dae;Kim, Chul Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.2
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    • pp.1126-1139
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    • 2014
  • World is experiencing abnormal weather caused by urbanization and industrialization increasing greenhouse gas and one of these phenomenon domestically happening is flood and drought. The increase of green-house gases is due to urbanization and industrialization acceleration which are causing abnormal climate changes such as the El Nino and a La Nina phenomenon. It is expected that there will be many difficulties in water management, especially considering the topography and seasonal circumstances in Korea. Unlike in the past, a variety of water conservation initiatives have been undertaken like the river-management flow and water capacity expansion projects. To meet the increasing demand for water resources, new environmentally-friendly small and medium-sized dams have been built. Therefore, the development of a new paradigm for water resources management is essential. This study shows that additional security is needed for potential water resources through diversion tunnels and is very important to consider for future water supplies and situations. Using RCP 6.0 and RCP 8.5 in representative concentration pathway climate change scenario, specific hydrologic data of study basin was produced to analyze past observed basin rainfall tendency which showed both scenario 5%~9% range increase in rainfall. Through sensitivity analysis using objective function, population in highest goodness was 1000 and cross rate was 80%. In conclusion, it is expected that the results from this study will help to make long-term and stable water supply plans by using the potential water resource evaluation model which was applied in this study.