• Title, Summary, Keyword: Dam

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Evaluation of Resistance of Concrete-Face Rockfill Dam to Seismic Loading Using Shaking Table Test (진동대시험을 이용한 콘크리트 표면 차수벽형 석괴댐의 내진성능 평가)

  • Ha, Ik-Soo;Kim, Yong-Seong;Seo, Min-Woo;Park, Dong-Soon
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1118-1125
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    • 2005
  • In this study, seismic safety of CFRD(Concrete-Face Rockfill Dam) type "D" dam in operation is evaluated from the results of 1-g shaking table test using similitude laws. Model dam is made by similitude law considering the grain size of prototype dam component. After the model dam is impounded to the normal water level(N.W.L), it is excited by artificial earthquake wave corresponding to standard design respond spectrum of the "D" dam site. Displacement response behavior of the dam is examined through the measurement of vertical and horizontal displacement of dam crest. Also, amplification characteristics of acceleration with dam height is examined through the measurement of acceleration with dam height. Finally, the purpose of this study is to evaluate seismic safety of "D" dam in operation. From the results of acceleration measurement, it was found that acceleration of dam crest was amplified about 1.52 times compared to the acceleration of dam bottom and amplification phenomenon is outstanding at three quarters of dam height from the bottom of dam. From the analysis of displacement behavior, it was estimated that vertical displacement of prototype dam is 6.8cm (0.1% of dam height) and horizontal displacement 12.3cm(0.2% of dam height). These percentages is much lower than 1% of dam height(general stability criteria). Therefore, it was concluded that seismic stability of "D" dam against an estimated earthquake is guaranteed.

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Effect of the Peace-Dam Construction on the Flood Discharge and the Flood Stage of the Hwachun-Dam

  • Jun, Byoung-Ho;Shin, Hyun-Suk;Yoon, Jae-Young
    • Korean Journal of Hydrosciences
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    • v.5
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    • pp.17-31
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    • 1994
  • Because of the Keumkangsan-Dam and the Peace-Dam constructed in recent years, it is expected that the peak flood discharge and the peak flood stage at the Hwachun-Dam site have been changed. In this study, two methods were used to simulate and compare the effects of the upstream dam construction on the change of the discharge and the stage. One is the storage function method widely used for the hydrological routing in the country. The other is the DWOPER(Dynamic Wave Operational Model) package conducted on four different scenarios: (1) before the construction of the Keumkangsan-Dam and the Peace-Dam; (2) the exclusion of the Keumkangsan-Dam watershed (before the construction of the Peace-Dam); (3) the exclusion of the Keumkangsan-Dam watershed (after the construction of the Peace-Dam) ; (4) the exclusion of the Peace-Dam watershed. The results of the four test cases from the two methods show that the peak flood discharge and the peak flood stage at the Hwachun-Dam site are reduced due to the construction of the Peace-Dam. From these findings, it is suggested that the operational criteria for the optimal dam-operation of the Hwachun-Dam need to be modified.

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Development of Efficient Dam Safety Management System (댐의 효율적인 관리를 위한 프로세스 개발)

  • Lim, Jeong-Yeul;Kim, Bum-Joo;Oh, Seok-Hoon;Jang, Bong-Seok;Park, Han-Gyu
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.1596-1601
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    • 2005
  • Recently, the probable maximum precipitation (PMP) of dam sites has been greatly increased, compared to that in design, due to a rise in precipitation by abnormal weather, which led to an increase in National interest for dam safety. Therefore, the purpose of this study is to develop a management system of dam safety. The main contents of the first stage($'03{\sim}'04$) of the project consisted of determining the object of management system of dam safety through researched present situation of dam safety management in domestic and reviewing operation for management system of dam safety in abroad. In the second stage($'05{\sim}'06$), the study pursues constructing a basis process of synthetic safety management system through dam safety program and developing a system that can judge dam safety with an improve in reliability of measurement data.

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Evaluation of Internal Settlement of Rockfill Dam under Construction (석괴댐의 축조 중 내부 침하 거동 평가)

  • Seo, Min-Woo;Kim, Yong-Seong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.4
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    • pp.45-52
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    • 2010
  • The purposes of this research are to analyze the internal settlement behavior of Concrete Faced Rockfill Dam (CFRD) typed 'D dam' and to evaluate the stability of the 'D dam' during dam construction using internal settlement measurements and results of numerical analysis. The field measurements were obtained during dam construction period. The numerical analysis was also carried out for the same construction period. The numerical analysis focused mainly on prediction of stress and displacement behavior of 'D dam' during dam construction stage using input parameters obtained from laboratory tests, i.e. large triaxial tests. The behavior of 'D dam' was evaluated to be stable from comparing the results of field measurements and numerical analysis. A simple empirical equation is also presented to predict final settlement at the completion of dam construction, using settlement measurement monitored during dam embankment.

Geotechnical considerations for the existing dam rehabilitation (기존댐 재개발시의 지반공학적 고려)

  • Jeon, Je-Sung;Shin, Dong-Hoon;Kim, Ki-Young;Cho, Sung-Eun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.589-596
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    • 2005
  • The public has negative understanding about dam construction nowadays although dam plays an important role in water supply to satisfy essential demand for living. Dam rehabilitation, in this actuality, has been recognized as an alternative to expedite continuous water policies related to irrigation and flood control. This study focused on dam rehabilitation and included its necessity and discussions on case histories associated with increasing reservoir capacity, spillway modification, overtopping protection, seepage control and improving stability of old dam. This paper, in geotechnical aspects, presents discussions of various rehabilitation methods and factors to be considered in designing dam rehabilitation.

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The Effect of Flood Discharge due to Dam Breach on Downstream Channel (댐붕괴시 홍수가 하천하류에 미치는 영향)

  • Ahn, Sang-Jin;Lee, Jun-Geun;Yeon, In-Sung;You, Hyung-Gyu
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.1666-1670
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    • 2006
  • The purpose of this study is to analyze how a downstream channel is affected in case of hypothetical dam failure. The object of it is Hwacheon dam basin within the basin of North Han river. This study has analyzed the influence on Pyeonghwa(Peace) dam and Hwacheon dam supposing that the Imnam dam in North Korea on the upper stream of North Han river is failed hypothetically at the MFWL(maximum flood water level) by a deluge of rain. The model applied at the main study is NWS(National Weather Service) FLDWAV(Flood Wave Routing Model). Dam breach characteristics data are analyzed by making nine hypothetical scenarios on the basis of other studies on the shape and size of dam breach, time of failure and so on. Expected peak discharge through the breach is verified to have the propriety in comparison with empirical function which is developed on the basis of the case of dam breach in the foreign countries and it is observed that peak discharge is more increasing, as the time of breach gets shorter and the breach width gets bigger. As a result of main study, even though the Imnam dam is hypothetically failed down, there has no influence on the Hwacheon dam of the downstream as the extended Pyeonghwa dam on the downstream controls the volume of discharge properly.

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Dam Failure and Unsteady Flow Analysis through Yeoncheon Dam Case(I) -Analysis of Dam Failure Time and Duration by Failure Scenarios and Unsteady Flow - (연천댐 사례를 통한 댐 파괴 부정류해석 및 하류 영향 검토(I) -댐 파괴 시나리오와 부정류 해석을 통한 지속시간 및 파괴시간 해석-)

  • Jang, Suk-Hwan
    • Journal of Environmental Science International
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    • v.17 no.11
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    • pp.1281-1293
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    • 2008
  • This study aims at the estimation of dam failure time and dam failure scenario analysis of and applied to Yeoncheon Dam which was collapsed August 1st 1999, using HEC-HMS, DAMBRK-FLDWAV simulation model. As the result of the rainfall-runoff simulation, the lancet flood amount of the Yeoncheon Dam site was $10,324\;m^3/sec$ and the total outflow was $1,263.90\;million\;m^3$. For the dam failure time estimation, 13 scenarios were assumed including dam failure duration time and starting time, which reviewed to the runoff results. The simulation time was established with 30 minutes intervals between one o'clock to 4 o'clock in the morning on August 1, 1999 for the setup standard for each case of the dam failure time estimation, considering the arrival time of the flood, when the actually measured water level was sharply raising at Jeongok station area of the Yeoncheon Dam downstream, As results, dam failure arrival time could be estimated at 02:45 a.m., August 1st 1999 and duration time could be also 30 minutes. Those results and procedure could suggest how and when dam failure occurs and analyzes.

EVALUATION OF THE WATER RESOURCES ASPECT OF THE OPERATING RESULTS OF THE DAECHEONG MULTIPURPOSE DAM

  • Noh, Jaek-young
    • Water Engineering Research
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    • v.5 no.1
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    • pp.17-36
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    • 2004
  • This paper evaluated the water resources aspect of the operating results of the Daecheong Multipurpose Dam for the last 21 years. The elements that were evaluated included the amount of water supply from the dam. volume of outflow from the regulating dam, changes in the runoff volume at the dam site and downstream, and variations in the water supply capacity of the Daecheong Multipurpose Dam and the Geum River Barrage Dam situated in the estuary. The rainfall-runoff model was used to evaluate the changes in the runoff volume, and the water balance analysis system was used to evaluate the variations in the dams'water supply capacities. The volume of domestic and industrial water supply from the Daecheong Multipurpose Dam increased to 6.1 times for the last 21 years from 61${\times}$$10^6$$m^3$ in 1981 to 375${\times}$$10^6$$m^3$in 2001. The rate of outflow to inflow of the Daecheong Dam was analyzed 1.30 times in dry season, 1.12 times in semi-dry season, and 0.90 times in rainy season. The volume of inflow to the Geum River Barrage Dam down- stream after the dam's construction increased to 1.25 times in dry season and 1.02 times in semi-dry season and decreased to 0.94 times in rainy season. The water supply capacity of the estuary barrage dam almost did not change in cases with or without the Daecheong Multipurpose Dam, but storages were largely affected by the outflows of the Daecheong Multipurpose Dam.

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Shaking Table Test for Comparison of Seismic Performance of Concrete-Face Rockfill Dam and Earth Core Rockfill Dam (표면차수벽형 석괴댐과 락필댐의 내진성능 비교를 위한 진동대시험)

  • Ha, Ik-Soo;Lim, Eun-Sang;Seo, Min-Woo;Kim, Yong-Seung
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.3-10
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    • 2005
  • In this study, 1-g shaking table tests on the model of CFR(Concrete-Face Rockfill) type "D" dam in operation and the model of virtual ECRD(Earth Core Rockfill Dam) of which static stability is about the same compared to the model of CFRD were carried out. The purpose of this study is to compare the seismic performance of CFRD and ECRD from the analysis of model test results. Displacement response behavior of the dam was examined through the measurement of vertical and horizontal displacement of model dam crest. Also, amplification characteristics of accelerometers installed with dam height were examined through the measurement of acceleration with dam height. Also, in the case of ECRD, patterns of excess pore pressure generation with dam height were examined. From the test results, it was found that accelerations of dam crest of CFRD and ECRD were amplified about 1.52 times and 2 times compared to the accelerations of dam bottom, respectively. amplification was outstanding at three quarters of dam height from the bottom of dam. This phenomenon was outstanding in case of ECRD. And it was estimated that vertical and horizontal displacement of prototype dam of CFRD were 6.8cm (0.1% of dam height) and 12.3cm (0.2% of dam height), respectively. Also, it was estimated that vertical and horizontal displacement of prototype dam of ECRD were 4.3cm (0.1% of dam height) and 5.5cm (0.11% of dam height), respectively.

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Runoff Estimation of Imjin River Basin through April 5th Dam and Hwanggang Dam Construction of North Korea (북한의 4월5일댐과 황강댐 건설에 따른 임진강 유역의 유출량 평가)

  • Kim, Dong-Phil;Kim, Kyoung-Ho;Kim, Joo-Hun
    • Journal of Environmental Science International
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    • v.20 no.12
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    • pp.1635-1646
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    • 2011
  • This April 5th dam and Hwanggang dam, which are located in Imjin river, North Korea, become the main causes of water shortages and damages in Imjin river downstream. April 5th dam is assumed a small or medium-sized dam, its total storage volume reaches about 88 million $m^3$. And Hwanggang dam, multi-purposed dam of total storage volume approximately 0.3 billion $m^3$ to 0.4 billion $m^3$ is used as source of residental or industrial water in Gaeseong Industrial Complex. North Korea, which has April 5th dam and Hwanggang dam in Imjin river, manages water of approximately 0.39 billion $m^3$ to 0.49 billion $m^3$ directly. As water is storaged or discharged through dam, it causes a severe damage to areas in Yeoncheon-gun and Paju city, South Korea. Therefore, this study intends to analyze and estimate runoff through dam construction by using hydrological observation data and artificial data such as service water supply and agricultural water in Imjin river, water shortage and damage correctly.