• Title/Summary/Keyword: Daecheong Dam

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Bivariate Drought Frequency Analysis to Evaluate Water Supply Capacity of Multi-Purpose Dams (이변량 가뭄빈도해석을 통한 다목적댐의 용수공급능력 평가)

  • Yu, Ji Soo;Shin, Ji Yae;Kwon, Minsung;Kim, Tea-Woong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.37 no.1
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    • pp.231-238
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    • 2017
  • Water supply safety index plays an important role on assessing the water supply capacity of hydrologic system. Due to the absence of consistent guidance, however, practical problems have been brought up on data period used for dam design and performance evaluation. Therefore, this study employed bivariate drought frequency analysis which is able to consider drought severity and duration simultaneously, in order to evaluate water supply capacity of multi-purpose dams. Drought characteristics were analyzed based on the probabilistic approach, and water supply capacity of five multi-purpose dams in Korea (Soyang River, Chungju, Andong, Daecheong, Seomjin River) were evaluated under the specific drought conditions. As a result, it would be possible to have stable water supply with their own inflow during summer and fall, whereas water shortage would occur even under the 1-year return period drought event during spring and winter due to low rainfall.

Phytosociological Characteristics of Qeurcus acutissima Forest in Daecheong-dam basin (대청댐 유역 상수리나무림의 식물사회학적 특성)

  • Kim, Sung-Yeol;Moon, Geon-Soo;Lim, Sung-Been;Paek, Hye-Jung;Song, Won-Kyong;Choi, Jae-Yong
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.24 no.2
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    • pp.85-102
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    • 2021
  • Phytosociological characteristics on Quercus acutissima forests distribution in Daechong-dam basin survey has been carried out using Z.-M. School's methodology and numerical-classification analyses. A total of 43 phytosociological relevés were sampled. Syntaxa were described as Oplismenus undulatifolius-Quercus acutissima community(typicum subcommunity, Phryma leptostachya var. asiatica subcommunity, Ulmus davidiana var. japonica subcommunity), Quercus acutissima community and Quercus variabilis-Quercus acutissima community (typicum subcommunity, Castanea crenata subcommunity). The above three plant communities were classified with species composition reflecting local environmental characteristics of mountain topographies, inclination degrees, and rock exposure rates. Conclusively, those communities were recognized as secondary vegetation affected by high intensity and frequency of human impacts as they inhabited in southward hill lands and low lying grounds in mountains adjacent to human settlements and arable lands. Quercus acutissima community was classified as rural type syntax based on their inlandward distribution and species composition differences from urban forests. Afforest process and natural succession were discussed in relation with habitat environmental elements of Quercus acutissima forest in the survey area.

Rainfall-Runoff Character Using Rainfall-Runoff Forecasting Model (RRFS) on Daecheong Dam Basin (RRFS에 의한 대청댐 유역의 강우-유출 특성)

  • Maeng, Seung-Jin;Hwang, Man-Ha;Ko, Ick-Hwan;Lee, Hyeon-Gyu
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.1782-1786
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    • 2006
  • 본 연구에서는 1983년부터 2004년까지의 대청댐 유입량과 RRFS에 의한 모의 유출량 분석을 실시하여 해당 월의 강우 특성에 대응하는 유출분석을 실시하였다. 본 연구에서는 대청댐의 강수량대비 유출율의 변화를 살펴보았으며 그 결과 대청댐 유입량의 유출률은 약 $20%{\sim}80%$의 큰 편차를 보이고 있었다. 이러한 원인은 연강수량의 편차가 크기 때문이다. 연강수량과 유출율 관계에 대한 상관분석결과 결정계수가 0.7261로서 5% 수준의 유의차가 인정되었다. 강우량 대비 분기별/월별 유출률 변화를 살펴보면 대청댐 유입량의 경우 홍수기인 3/4분기에 강우량이 증가함에 따라 유출률이 증가하여 나타났으나 이외의 시기에서는 커다란 산포도를 보이며 뚜렷한 상관관계를 나타내지는 않았다. 이와 같은 특성은 월별 유출률 변화에서도 확인할 수 있었다. 본 연구의 후속으로는 유역유출의 주요인자인 강우량뿐만 아니라 용수이용량, 회귀량 등과 같은 여러 유출인자에 대해 유출량과의 물리적/통계학적인 분석을 실시함으로써 소유역 및 주요지점별로 유출지표를 개발하고자 한다. 이와 같이 개발된 유출 지표는 RRFS 모의 운영상의 중요 참고 자료로 활용될 수 있을 것이다.

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Removal of Odor and THM from the Raw Water of Daecheong Dam (대청호 원수내 냄새 및 THM 제거방안 연구)

  • Jeon, Hang-Bae;Yun, Gi-Sik
    • Journal of Korea Water Resources Association
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    • v.30 no.3
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    • pp.235-245
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    • 1997
  • A pilot scale study for removing odor and trihalomethane formation potential (THMFP) was investigated in the standard water treatment plant equipped with ozone oxidation and granular activated carbon (GAC) adsorption processes. The removal efficiency of dissolved organic carbon (DOC) in the pilot scale standard water treatment process (PSWTP) was about 25%, however, no more removal in the ozone oxidation process. On a GAC after 30 days operation, DOC removal efficiency was about 75%. Odor removal efficiency was about 30% in PSWTP, 60% in ozone oxidation, and almost complete in well as DOC. Mid-1 and 2 that showed breakthrough in odor inducing material as well as DOC. Mid-1 and 2 chlorination was able to reduce trihalomethanes (THM) by 25% compared to prechloringation, while postchlorination alone could reduce them by 30%.

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Comparison of streamflow runoff model in Korea for applying to reservoir operation (저수지 운영을 위한 한국 하천 유출 모형의 비교)

  • Noh, Jae-Kyoung;Lee, Jae-Nam
    • Korean Journal of Agricultural Science
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    • v.38 no.3
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    • pp.513-524
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    • 2011
  • To evaluate the applicability of inflow runoff model to reservoir operation in Korea, DAWAST model and TPHM model which are conceptual lumped daily runoff model and were developed in Korea, were selected and applied to simulate inflows to Daecheong multipurpose dam with watershed area of 4,134 $km^2$, and water storages in Geryong reservoir with watershed area of 15.1 $km^2$ and total water storage of 3.4 M $m^3$. Evaluating inflows on an yearly, monthly, ten-day, and daily basis, inflows by DAWAST model showed balanced scatters around equal value line. But inflow by TPHM model showed high in high flows. Annual mean water balance by DAWAST model was rainfall of 1,159.9 mm, evapotranspiration of 622.1 mm, and inflow of 644.6 mm, from which rainfall was 104.8 mm less than sum of evapotranspiration and inflow, and showed unbalanced result. Water balance by TPHM model showed satisfactory result. Reservoir water storages were shown to simulate on a considerable level from applying DAWAST and TPHM models to simulate inflows to Geryong reservoir. But it was concluded to be needed to improve DAWAST and TPHM model together from imbalance of water balance and low estimation in high flow.

Optimal Allocation of Water Resources based on the Network Model (Network 모형에 의한 수자원의 최적배분)

  • 연규방;심순보
    • Water for future
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    • v.27 no.1
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    • pp.111-121
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    • 1994
  • The purpose of this paper is to construct a network model for the optimal allocation of limited water resources to the nodal system with given priorities. The solution technique for the model is based on the out-of-kilter algorithm(OKA). For the verification and application of the theoretical methodology and computer programs, the Geum river system is selected. Using release of Daecheong dam and water demand in Geum river basin, optimal allocation of water resources is accomplished for 4 cases(case 1 - case 4) which consider priority numbers in the demand nodes. The results of the application show that the model can reasonably represent the physical system, and water shortage at the demand nodes with high priority numbers is reduced. Its system solution was verified with that by the revised simplex algorithm.

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A Study on the Real Time Forecasting for Monthly Inflow of Daecheong Dam using Seasonal ARIMA Model (계절 ARIMA모형을 이용한 대청댐 유역 실시간 유입량 예측에 관한 연구)

  • Kim, Keun-Soon;Ahn, Jae-Hyun
    • Proceedings of the Korea Water Resources Association Conference
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    • 2010.05a
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    • pp.1395-1399
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    • 2010
  • 최근 들어 전 세계적으로 태풍과 가뭄 그리고 국지적인 호우 등의 기상변화로 인하여 수자원 종합적인 개발과 이용계획에 대한 전문적인 예측이 필요하다. 우리나라는 홍수기에 집중적인 강우 발생으로 인하여 평수기와 유입량 차이가 심한 수문특성을 가지고 있어 안정적인 수자원 공급에 대한 장기적인 관점에서 이수와 치수정책을 수립해야 한다. 본 연구는 1985년 1월부터 2008년 12월까지 24년에 해당하는 한정된 기간의 짧은 유출량 자료를 갖는 대청댐 유역에서의 시계열 유입량 특성을 Box-Jenkins모형 또는 ARIMA모형을 적용하여 추계학적 분석을 실시하였다. 월유입량과 같은 비정상성 시계열에 적용될 수 있는 적절한 추계학적 모형을 찾기 위하여 모형의 식별과 모형의 추정, 모형의 검진 등의 3단계에 걸친 분석을 실시하였다. 연구결과 대청댐 월유입량 예측모형으로 승법계절 ARIMA$(0,1,2){\times}(1,1,0)_{12}$이 유도되었으며, 이 모형으로 1, 3, 6, 12개월의 선행기간에 대한 실시간 유입량을 예측하였다. 예측된 유입량을 2008년 실측유입량과 비교한 결과 6개월에 대한 예측의 정확성이 가장 높게 나타났다. 또한 평수기와 홍수기를 구분한 예측도 실시하였으며, 평수기는 1개월 홍수기는 3개월 간격으로 예측하는 것이 가장 적절한 것으로 분석되었다.

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A Study on the Characteristics of Depositional Landform Change in the Geum River Channel Using Unmanned Aerial Vehicle: Focusing on Before and After the Opening Gate of Gongju Weir (무인항공기를 활용한 금강 하도내의 퇴적지형 변화 특성 연구: 공주보 개방 전·후를 중심으로)

  • Yoon, Hye-Yeon;Yun, Kwang-Sung;JANG, Dong-Ho
    • Journal of The Geomorphological Association of Korea
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    • v.28 no.4
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    • pp.1-13
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    • 2021
  • In this study is aerial photos and UAV(Unmanned Aerial Vehicle) images were used to analyzed the characteristics of depositional landform changes in the Geum river channels before and after the opening gate of Gongju weir. Based on the depositional landform classification result, the main stream and the bare land occupied most of the area in all periods, and also found that the main stream, mid-channel island, and sand bar occupied a greater degree of area increase or decrease compared to other landforms in the classification items. As a result of analyzing the characteristics of depositional landform changes before and after the opening gate of Gongju weir, it is judged that the depositional landforms have changed due to the decreased water level of the Geum river after the opening of the weir, the summer rainy season and typhoons, river stabilization after the effluence of Daecheong dam, supply and deposition of river sediments and fixation of vegetation. The results derived from this study can be used as basic data for the study of river depositional landforms and the establishment of management and conservation plans for the landforms in river channels.

Variation of Inflow Density Currents with Different Flood Magnitude in Daecheong Reservoir (홍수 규모별 대청호에 유입하는 하천 밀도류의 특성 변화)

  • Yoon, Sung-Wan;Chung, Se-Woong;Choi, Jung-Kyu
    • Journal of Korea Water Resources Association
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    • v.41 no.12
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    • pp.1219-1230
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    • 2008
  • Stream inflows induced by flood runoffs have a higher density than the ambient reservoir water because of a lower water temperature and elevated suspended sediment(SS) concentration. As the propagation of density currents that formed by density difference between inflow and ambient water affects reservoir water quality and ecosystem, an understanding of reservoir density current is essential for an optimization of filed monitoring, analysis and forecast of SS and nutrient transport, and their proper management and control. This study was aimed to quantify the characteristics of inflow density current including plunge depth($d_p$) and distance($X_p$), separation depth($d_s$), interflow thickness($h_i$), arrival time to dam($t_a$), reduction ratio(${\beta}$) of SS contained stream inflow for different flood magnitude in Daecheong Reservoir with a validated two-dimensional(2D) numerical model. 10 different flood scenarios corresponding to inflow densimetric Froude number($Fr_i$) range from 0.920 to 9.205 were set up based on the hydrograph obtained from June 13 to July 3, 2004. A fully developed stratification condition was assumed as an initial water temperature profile. Higher $Fr_i$(inertia-to-buoyancy ratio) resulted in a greater $d_p,\;X_p,\;d_s,\;h_i$, and faster propagation of interflow, while the effect of reservoir geometry on these characteristics was significant. The Hebbert equation that estimates $d_p$ assuming steady-state flow condition with triangular cross section substantially over-estimated the $d_p$ because it does not consider the spatial variation of reservoir geometry and water surface changes during flood events. The ${\beta}$ values between inflow and dam sites were decreased as $Fr_i$ increased, but reversed after $Fr_i$>9.0 because of turbulent mixing effect. The results provides a practical and effective prediction measures for reservoir operators to first capture the behavior of turbidity inflow.

Analyzing Ecological Soundness Considering the Implicit Weight of the Indicator (지표의 내재적 가중치를 고려한 하천의 생태적 건전성 평가)

  • Kim, Hong-Myung;Ha, Sung-Ryong
    • Journal of Environmental Impact Assessment
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    • v.30 no.4
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    • pp.258-269
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    • 2021
  • The purpose of this study is to establish a system to evaluate the ecological soundness of the Geum river basin. The study target area is 14 sub-watersheds of the Geum river basin. For the selection of indicators to ensure transparency and consistency of the evaluation indicators, the ecological soundness indicators were secured by using the indicator adjustment method derived in consideration of the intrinsic weight change characteristics between indicators. The index with the greatest impact on the final composite index was identified as the index of the aquatic ecology among the water quantity, water quality, aquatic ecology, and habitat-riparian environment dimensions. As a result of analyzing the ecological health index of the river, the watershed upstream of the dam (based on the Daecheong -dam) was evaluated to be in relatively good condition until 2014 compared to the base year(2008), and the watershed downstream of the dam was evaluated to be in a poor condition. The annual trend of changes in the ecological soundness index on an annual basis is as follows. In the case of Yongdamdam, Yongdamdamdownstream, Bocheong-chun, Daechungdam, Daechungdamdownstream, and Nonsancheon, although there are differences by time period, the soundness index is in declining. On the other hand, Mujunamdaecheon, Yeongdongcheon, and Gapcheon were evaluated to have improved soundness, while Chogang, Daechungdamupstream, Mihocheon, Gongjugeumgang, and Geumgangestuary were evaluated to deteriorate again after soundness was improved.