• 한국수자원학회논문집
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• 제30권6호
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• pp.709-720
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• 1997

다목적 댐의 홍수기 저수지 운영에 있어 댐 규정에 명시된 홍수조절용량이 부족하다고 판단되는 경우, 한정된 저수공간의 탄력적인 이용방안을 강구하여 추가적인 홍수조절용량을 확보하여야 한다. 본 연구에서는 홍수기의 기상특성을 반영하여 홍수기를 시기적으로 구분하고, 구분된 홍수기간별로 각각의 이수목적수위와 치수목적수위를 검토하였다. 검토된 결과를 바탕으로 서로 상반되는 이수와 치수를 함께 고려할 수 있는 방안을 강구하였으며, 이로부터 결정된 홍수기 댐 운영수위를 홍수기 가변제한수위라 정의하였다. 홍수기 가변제한수위를 결정하는 일련의 절차에 대해 대청 다목적 댐을 대상으로 적용하고 그 결과를 분석하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.697-703
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• 2008

Excessive water leakage phenomenon happens through damage of nation core zone of about 17,000 storage of water facilities or collapse of dam is worried, is being damaged or enforce dilapidated fill dam core zone's repair reinforcement. Example that use grouting method of construction considering construction and economic performance etc. recently by repair reinforcement way about defect of dam is increased. Permeation grouting method repair & reinforcement of fill dam countermeasure is preferred in nation. Do that is economical to decide these repair reinforcement effect and grouting effect estimation method that do not give damage to dam is effective. Therefore, observing electricity resistivity Survey change of dam since grouting reinforcement using Electric resistivity Survey inquiry of seismic survey method in this research, Wished to verify grouting effect whether is possible as Electric resistivity Survey, and study whether integrity of dam through repair reinforcement defined.

• 한국관개배수논문집
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• 제19권1호
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• pp.19-29
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• 2012

The data of the agricultural water quality survey network was analyzed between from 1990 to 2010 in order to propose effective plans for water quality management by analyzing the characteristics of agricultural lakes and the change of water quality. The result of the analysis shows that there is a correlation between water quality and items that can be a function of water depth such as dam height, dam length, dam height/dam length ratio and active storage/surface area of lake ratio. This means that, Korean agricultural lakes, there is a correlation between water quality and water depth. Water quality of the lakes that have lower than 5m of active storage/surface area of lake ratio (effective water depth) especially tends to get worse rapidly. The Chl-a and COD concentration of Korean agricultural lakes have a tendency to increase between June and September. Therefore, we recommend first taking a water quality improvement project for the lakes preformed watershed management project, and taking a preventive short-term water quality improvement project for the unperformed lakes before June among lakes that have lower than 5m of effective water depth.

• Geomechanics and Engineering
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• 제13권5호
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• pp.881-892
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• 2017

Design and management of concrete slabs in concrete-faced rock-fill dams are crucial issues for stability and overall dam safety since cracks in the concrete face induced by stress, shrinkage, and deterioration can cause severe leakage from the reservoir into the dam. Especially, the increase of dam height to a certain level to enhance the storage capacity and to improve hydraulic stability can lead to undesirable deformation behavior and stress distribution in the existing dam body and in the concrete slabs. In such conditions, simulation of a concrete slab with a numerical method should involve the use of an interface element because the behavior of the concrete slab does not follow the behavior of the dam body when the dam body settles due to the increase of dam height. However, the interfacial properties between the dam body and the concrete slab have yet to be clearly defined. In this study, construction sequence of a 125 m high CFRD in South Korea is simulated with commercial FDM software. The proper interfacial properties of the concrete slab are estimated based on a comparison to monitored vertical displacement history obtained from the concrete slab. Possibility of shear strength failure under the critical condition is investigated based on the simplified model. Results present the significance of the interfacial properties of the concrete slab.

• 물과 미래
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• 제26권1호
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• pp.93-101
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• 1993

화천댐 상류에는 최근 금강산댐과 평화댐이 건설되었으며 이로인해 홍수유출 및 수위에 큰 변화를 보여왔다. 본 연구에서는 가용한 유역 자료를 사용하여 상류조건의 변화에 따른 화천댐으로의 유입량 및 수위 변화를 모의하였다. 모의를 위해서는 수문학적 추적 방법중 저류함수법과 수리학적 홍수 추적 방법중 미국 NWS의 DWOPER(Dynamic Wave Operational Model)Package를 사용하였다. 홍수 추적은 1) 금강산댐과 평화댐 건설전, 2) 금강산댐 유역제외(평화댐 건설전), 3) 금강산댐 유역제외(평화댐 건설후), 4) 평화댐의 수문폐쇄시등의 4가지 경우에 대하여 모의하였다. 그 결과 상류댐의 건설로 인해 화천댐 유역의 유입량과 수위가 감소되는 것으로 나타났다. 이같은 결과는 화천댐의 최적운영을 위하여 새로운 댐 조작기준의 설정이 필요함을 의미한다고 사료된다.

• 한국농공학회논문집
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• 제47권2호
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• pp.3-12
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• 2005

The objective of this study is securement of upland irrigation water using storage level management of small dams. However, it is not new development of water resources but securement of water using storage level management of existing dam. This study has enhanced the water utilization coefficient of dam, after extra available water had been calculated by application of periodical management storage level and this water is used to other water like the upland irrigation water demand. As the result of application, it can secure extra available water except the water requirement. Minimum extra available water except flood is about $20,000,000\;m^3$ and crop irrigation water demand of 10yr frequency is about $2,033,000\;m^3$ in Seongju. The utilization of crop irrigation water can be possible. And extra available water is about $3,102,000\;m^3$ in 2000, $1,959,000\;m^3$ in 2001 except flood period and crop irrigation water demand of 10yr frequency is about $2,272,000\;m^3$ in Donghwa. It is judged that extra available water cannot be used to crop irrigation water during the dry season in Dongwha. Consequently, when management storage level is determined and more efficient use of water is gotten like this study, water utilization coefficient will be enhanced.

• 한국환경과학회지
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• 제14권11호
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• pp.995-1004
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• 2005

As a research establish reservoir safety operation for small dam systems. This study presents hydrologic analysis conducted in the Duckdong and Bomun dam watershed based on various rainfall data and increase inflow. Especially the Duckdong dam without flood control feature are widely exposed to the risk of flooding, thus it is constructed emergency gate at present. In this study reservoir routing program was simulation for basin runoff estimating using HEC-HMS model, the model simulation the reservoir condition of emergency Sate with and without. At the reservoir analysis results is the Duckdong dam average storage decrease $20\%$ with emergency gate than without emergency gate. Also, the Bomun dam is not affected by the Duckdong flood control augmentation.

• 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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• 제37권8호
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• pp.653-662
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• 2004

본 연구에서는 평화의댐을 화천댐과 연계운영하여 치수측면에서 뿐만 아니라 이수측면에서의 효과를 증대시키는 방안을 모색하였다. 평화의댐은 2003년 2단계 축조공사 완료후 현재 댐 마루표고가 EL.225m에서 증축될 계획이어서 담수능력이 증가될 것이다. 만일 평화의댐 저수용량이 증대되고 수문이 설치된다면 치수뿐만 아니라 이수 측면에서도 한강수계에 도움이 될 것이다. 본 연구에서는 모의운영 기법을 사용하여 평화의댐 상시만수위 변화, 화천댐 하절기 제한수위의 변화, 그리고 평화의댐으로 유입되는 유입량의 변화를 다양하게 고려한 저수지 운영을 실시하여, 신뢰도 95%시 화천댐 연평균발전량, 상시발전량, 용수공급량을 산정하였다. 그 결과 평화의댐 상시만수위와 화천댐 제한수위 증대시 발전량은 증가하나 유입량 감소시에는 발전량에 크게 변화를 미치지 않았다. 용수공급능력은 동일한 조건하에서 유입량 감소시 약 35∼40%가량 감소하므로 일정수준을 유지하려면 평화의댐을 증고하여 상시만수위를 높여야 할 것으로 판단된다.

• Computers and Concrete
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• 제33권5호
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• pp.559-572
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• 2024

Problems of under-sized dams (small dams with large basin area) could get worse under the global warming condition. This study evaluates the possible change of these problems with the Namgang Dam, an under-sized dam in Korea. For this purpose, first, this study simulates the dam inflow data using a rainfall-runoff model, which are then used as input for the reservoir operation. As a result, daily dam storage, dam release, and dam water supply are derived and compared for both past observed period (1973~2022) and future simulated period (2006~2099) based on the global warming scenarios. Summarizing the results are as follows. First, the inflow rate in the future is expected to be increased significantly. The maximum inflow could be twice of that observed in the past. As a result, it is also expected that the frequency of the water level reaching the high level is increasing. Also, the amount and frequency of dam release are to be increased in the future period. More seriously, this increase is expected to be concentrated on rather extreme cases with large dam release volume. Simply, the condition for flood protection in the downstream of the Namgang Dam is becoming worse and worse. Ironically, the severity of water shortage problem is also expected to become much worse. As the most extreme case, the frequency of no water supply was zero in the observed period, but in the future period, it becomes once every five years. Both the maximum consecutive shortage days and the total shortage volume are expected to become more than twice in the future period. To prevent or mitigate this coming problem of an under-sized dam, the only countermeasure at this moment seems to be its redevelopment. Simply a bigger dam with larger dam reservoir can handle this adverse effect more easily.