• 한국태양에너지학회 논문집
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• 제31권3호
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• pp.42-47
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• 2011

Small hydropower resources for five major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow caused from rainfall condition. And another model to predict hydrologic performance for small hydropower(SHP) plants is established. Monthly inflow data measured at Andong dam were analyzed. The predicted results from the developed models in this study show that the data were in good agreement with measured results of long term inflow at Andong dam. It was found that the models developed in this study can be used to predict the available potential and technical potential of SHP sites effectively. Based on the models developed in this study, the hydrologic performance for small hydropower sites located in river systems have been analyzed. The results show that the hydrologic performance characteristics of SHP sites had some difference between the river systems. Especially, the specific design flow and specific output of SHP sites located on North Han river and Nakdong river systems had large difference compared with other river systems.

• Computers and Concrete
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• 제13권5호
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• pp.633-648
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• 2014

The seismic safety of concrete dams is one of the important problems in the engineering due to the vast socio-economic disasters which may be caused by collapse of these infrastructures. The accuracy of the risk evaluation associated with these existing dams as well as the efficient design of future dams is highly dependent on a proper understanding of their behaviour due to earthquakes. This paper develops an anisotropic damage model for arch dam under strong earthquakes. The modified Drucker-Prager criterion is adopted as the failure criteria of the dynamic damage evolution of concrete. Some process fields and other necessary information for the safety evaluation are obtained. The numerical results show that the seismic behaviour of concrete dams can be satisfactorily predicted.

• 한국관개배수논문집
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• 제12권1호
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• pp.116-122
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• 2005

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.950-952
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• 2004

The developments of small hydropower plants in korea have been delayed by rising construction cost/low feasibility, local people's disagreement even though the capacity of water resources are enough. However, the recent raising of electricity purchasing price, the government's enlarging plan of small hydropower plants caused the newly development to be accelerated. In this paper, the design of remote control of small hydropower plants are proposed for better economy and easy control. The operation and monitoring of power plants are planned based on One(1)-man control from the central control room of regional area water works/ operating station and engineering station multipurpose dam offices with the equipments of OS, RTU(PLC), KT leased lines, WMPS, CSU and etc.

• Structural Engineering and Mechanics
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• 제57권3호
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• pp.529-541
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• 2016

Under the interaction between dam body, dam foundation and external environment, the dam structural behavior presents the time-varying nonlinear characteristics. According to the prototypical observations, the correct identification on above nonlinear characteristics is very important for dam safety control. It is difficult to implement the description, analysis and diagnosis for dam structural behavior by use of any linear method. Based on the rescaled range analysis approach, the algorithm is proposed to identify and extract the fractal feature on observed dam structural behavior. The displacement behavior of one actual dam is taken as an example. The fractal long-range correlation for observed displacement behavior is analyzed and revealed. The feasibility and validity of the proposed method is verified. It is indicated that the mechanism evidence can be provided for the prediction and diagnosis of dam structural behavior by using the fractal identification method. The proposed approach has a high potential for other similar applications.

• Computers and Concrete
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• 제29권4호
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• pp.209-217
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• 2022

In order to analyze the static and dynamic structural characteristics of the Obermeyer gate under overflow conditions, the force characteristics and vibration characteristics of the shield plate structure are studied based on the fluid-solid coupling theory. In this paper, the effects of the flow rate, airbag pressure and overflow water level on the structural performance of shield plate of air shield dam are explored through the method of controlling variables. The results show that the maximum equivalent stress and total deformation of the shield plate decrease first and then increase with the flow velocity. In addition, they are positively correlated with the airbag pressure. What's more, we find that the maximum equivalent stress of the shield plate decreases first and then increases with the overflow water level, and the total deformation of the shield plate decreases with the overflow water level. What's more importantly, the natural frequency of the shield structure of the Obermeyer gate is concentrated at 50 Hz and 100 Hz, so there is still the possibility of resonance. Once the resonance occurs, the free edge of the shield vibrates back and forth. This work may provide a theoretical reference for the safe and stable operation of the shield of the Obermeyer gate.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.531-534
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• 2003

A model using a nonlinear programming technique was applied for allocating the optimal water depending on storage level changes of the Sumjin dam. The objective function of optimization model was set up to maintain the storage at target level, to satisfy the water demand, and to maximize the hydropower production. In this way, the water allocation as to target level and instream flow was optimized and compared with historical operational data.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 춘계학술발표대회 논문집
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• pp.235-240
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• 2011

Small hydropower resources for five major river systems have been studied. The model, which can predict flow duration characteristic of stream, was developed to analyze the variation of inflow caused from rainfall condition. And another model to predict hydrologic performance for small hydropower(SHP) plants is established. Monthly inflow data measured at Andong dam were analyzed. The predicted results from the developed models in this study showed that the data were in good agreement with measured results of long term inflow at Andong darn. It was found that the models developed in this study can be used to predict the available potential and technical potential of SHP sites effectively. Based on the models developed in this study, the hydrologic performance for small hydropower sites located in river systems have been analyzed. The results show that the hydrologic performance characteristics of SHP sites have some difference between the river systems. Especially, the specific design flowrate and specific output of SHP sites located on North Han river and Nakdong river systems have large difference compared with other river systems.

• 한국수자원학회논문집
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• 제44권9호
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• pp.753-763
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• 2011

댐의 계획과 설계단계에서 설정된 유효저수용량은 여러 가지 이유로 운영단계에서 잘 지켜지지 못하는 경우가 있다. 어떤 댐은 운영과정에서 내 외적인 주변여건의 변화로 본연의 운영목적을 달성하는데 어려움이 있을 수 있다. 따라서 이를 개선하기 위해서는 시설물의 목표 달성을 위한 기능회복이 적절히 이루어져야 하며, 관련 대안들이 마련되어야 한다. 특히댐 하류하천의 부적절한 관리는 댐의 홍수조절기능과 하천환경에 부정적인 영향을 미친다. 결국 댐의 다목적 기능을 정상화 시키고, 댐의 경제적 가치를 높이기 위한 댐하류하천정비가 댐사업자에 의해 진행되고 있다. 본 연구는 댐하류하천정비의 미흡으로 홍수조절을 위해 제약되었던 댐의 유효저수용량의 회복에 의한 이수편익을 분석하였다. 분석결과 임하, 대청 및 용담댐 등 3개댐에서 용수공급량은 19.9백만$m^3$/년 그리고 발전량은 20.8GWh/년이 증대되는 것으로 나타났다. 아울러 본 연구를 통해 얻어진 이수효과 정보는 댐직하류하천정비사업의 전체 경제성 평가 및 비용배분의 기초자료로 활용되었다.

• 한국수자원학회논문집
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• 제38권11호
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• pp.937-946
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• 2005

본 연구에서는 저수지의 용수수요 증가에 따른 용수공급능력 평가를 실시하여 추가 공급 가능량과 이를 위한 저수지 운영방법을 제안하였다. 이를 위하여 전역 최적해를 탐색하는 SCE-UA법과 다중 목적함수를 적용한 최적화 모형과 저수지의 유입량, 수요량, 발전량을 추정하는 저수지 운영 모형을 결합한 저수지 최적운영 모형을 개발하였다. 개발된 모형의 적용성은 섬진강댐의 최적운영에 모형을 적용하여 평가하였다. 모형의 적용기간은 유입량을 고려하여 풍수기, 평수기, 갈수기로 구분하였다. 풍수기에는 목표 운영수위별의 발전량이 실측발전량 보다 $-2.29{\~}14.61\%$, 갈수기에는 실측발전량 보다 $-5.94{\~}3.98\%$ 증가된 결과를 나타냈다. 평수기에는 실측발전량 보다 $-0.43{\~}6.35\%$ 증가 된 결과를 나타냈다. 섬진강댐의 하류 용수 증가에 따른 용수공급 가능량을 산정하기 위하여 댐하류 방류량을 0.17, 0.50, 0.70, 1.0, 1.5, $3.0\;m^3/sec$로 구분하여 최적 운영한 결과, 하류 방류량을 $0.70\;m^3/sec$ 이하, 목표 저수위를 194.0m 이하로 할 경우 실적 운영 결과 보다 향상된 결과를 나타냈다.