• Water Engineering Research
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• 제1권1호
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• pp.25-37
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• 2000

This study presents some results of a preliminary study for the coupled precipitation and river flow prediction system. The model system in based on three numerical models, Mesoscale Atmospheric Simulation model for generating atmospheric variables. Soil-Plant-Snow model for computing interactions within soil-canopy-snow system as well as the energy and water exchange between the atmosphere and underlying surfaces, and TOPMODEL for simulating stream flow, subsurface flow, and water tabled depth in an watershed. The selected study area is the 2,703 $\alpha_4$ $\km_2$ Soyang River basin with outlet at Soyang dam site. In addition to providing the results of rainfall and stream flow predictions, some results of DEM and GIS application are presented. It is obvious that the accurate river flow predictions are highly dependant on the accurate predictation predictions.

• 산업기술연구
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• 제21권B호
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• pp.233-240
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• 2001

This research was conducted with the aim of efficiently managing large scale of rivers such like Songyang-river through predicting water quality change with analyzing the characteristics of the flowing in nutrients and pollutants. The main result will be used as basic data for effectively operating reservoirs through controling water quality and quantity. The relationship between quantity of flow and water quality was analyzed and pollution loading into the basin was estimated. Three areas of Soyang-river upstream and one area of Suip-cheon in Yanggu-gun were selected as research sites. Flow and water quality were measured simultaneously. The relation between quantity of discharge and pollution concentration and between quantity of discharge and pollution loading were analyzed by statistical method, respectively. We provided a rating curve through measuring quantity of discharge(collecting quantity of discharge) and pollutograph and pollution loading curve through water quality data. Also, we analyzed the correlation between quantity of discharge per unit area and pollution loading per unit area in each basin. As resurt of this research, Buk-cheon spot revealed an excellent first grade water quality for the items including $BOD_5$, DO, and SS. The correlation coefficient between Buk-cheon spot's quantity of discharge and pollution loading was 0.896~0.996, showing the validity of analysis applying correlation curve formula of quantity of discharge and pollution loading in the same spot. Also, pollution loading per unit area of the items including $BOD_5$, COD, DO, SS, T-N, T-P increased as the area of basins get increased following the sequence of Buk-cheon, Suip-cheon, Naelin-cheon spots.

• 한국물환경학회지
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• 제33권3호
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• pp.282-290
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• 2017

A long-term resuspension of small particles, called persistent turbidity, is one of the most important water quality concerns in the dam reservoirs system located in North Han River. Persistent turbidity may incur aesthetic nuisance and harmful effect on the ecosystem health, in addition to elevated water treatment costs for the drinking water supply to the Seoul metropolitan area. These sufferings have been more intensified as the strength and frequency of rainfall events increase by climate change in the basin. This study was to analyze the effect of an extreme turbidity flow event that occurred in 2006 on the serial reservoirs system (Soyang-Uiam-Cheongpyung-Paldang) in North Han River. The CE-QUAL-W2 model was set up and calibrated for the river and reservoirs system using the field data obtained in 2006 and 2007. The results showed that Soyang Reservoir released turbid water, which was classified as the TSS concentration is greater than 25 mg/L, for 334 days with peak TSS of 264.1 mg/L after the extreme flood event (592.7 mm) occurred between July 10 and 18 of 2006. The turbid water departed from Soyang Reservoir reached at the most downstream Paldang Reservoir after about 20 days and sustained for 41 days, which was validated with water treatment plant data. Since the released water from Soyang Reservoir had low water temperature and high TSS, an underflow formed in the downstream reservoirs and vertically mixed at Paldang Reservoir due to dilution by the sufficient inflow from South Han River.

• 한국습지학회지
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• 제10권1호
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• pp.1-9
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• 2008

본 연구에서는 융설을 고려할 수 있는 물수지 모형인 WASMOD(Water And Snow MODeling system)에 대하여 기술하였으며, 소양강댐 상류유역에 적용하여 장기 월 유출량을 산정하였다. WASMOD의 장점은 입력자료의 구축이 간단하며 사용자가 쉽게 운영할 수 있다는 점이다. 모형의 매개변수를 최적화하기 위해 자동추적법인 VA05A를 이용하였으며, 관측 월 유출 수문곡선과 모의 월 수문곡선을 비교하였다. 관측 유출량과 계산 유출량간의 상관계수가 0.89이상으로, 이를 통해 WASMOD의 국내 유역에 적용가능성을 확인할 수 있었다.

• 한국수자원학회논문집
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• 제33권1호
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• pp.87-98
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• 2000

본 연구의 목적은 물리적 분포형 모형인 TOPMODEL의 국내 단일 유역에서의 홍수예보 능력을 검토하는데 있다. 이를 위해서 소양강댐 상류유역을 선정하였으며, 1990~1996년의 일 및 시 홍수사상을 선택하였다. 모형의 매개변수는 1990년의 일 호우사상을 이용하여 수동보정법으로 추정하였으며, 지형지수의 분포가 유출에 미치는 영향을 해석하였다. 모형의 매개변수 추정에 이용하지 않은 95년 및 96년 일 호우사상 및 90년, 95년, 96년 시 호우사상을 이용하여 TOPMODEL의 홍수예보능을 검토한 결과 관측유량과 계산유량의 상관계수가 일 홍수사상의 경우 0.77 이상, 시 홍수사상의 경우 0.87 이상으로 우수한 결과를 나타내었다. 국내의 홍수유출 특성과 모형의 개념 및 유량 산정 결과 등을 고려할 때 TOPMODEL의 홍수예보능은 우수한 것으로 판단된다.

• 한국물환경학회지
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• 제27권5호
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• pp.587-596
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• 2011

The interest in hydrological modeling has increased significantly recently due to the necessity of watershed management, specifically in regards to lumped models, which are being prosperously utilized because of their relatively uncomplicated algorithms which require less simulation time. However, lumped models require empirical coefficients for hydrological analyses, which do not take into consideration the heterogeneity of site-specific characteristics. To overcome such obstacles, a distributed model was offered as an alternative and the number of researches related to watershed management and distributed models has been steadily increasing in the recent years. Thus, in this study, the feasibility of a grid-based rainfall-runoff model was reviewed using the flood runoff process in the Han River basin, including the ChungjuDam, HoengseongDam and SoyangDam watersheds. Hydrological parameters based on GIS/RS were extracted from basic GIS data such as DEM, land cover, soil map and rainfall depth. The accuracy of the runoff analysis for the model application was evaluated using EFF, NRMSE and QER. The calculation results showed that there was a good agreement with the observed data. Besides the ungauged spatial characteristics in the SoyangDam watershed, EFF showed a good result of 0.859.

• 한국농공학회지
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• 제39권2호
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• pp.1-8
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• 1997

Abstract The need for integrated reservoir system operation become more intense as the demands from the system increase. A deterministic, three-dimensional discrete incremental dynamic programming approach is presented to derive reservoirs system operational planning strategies. The developed H3DP model optimizes the monthly operation of the Hwachon and Soyang Projects on the North Han river and Chungju Main Project on the South Han river. By using the H3DP model, Hwachon project was reevaluated as a component of the upstream multipurpose storage reservoirs in the basin based on 1993 hydrology. This case study demonstrates the practical use of the developed model for the basin multi-reservoir system operation in an integrated, multipurpose fashion.

• 한국수자원학회논문집
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• 제50권12호
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• pp.837-847
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• 2017

본 연구에서는 소양강댐 유역의 수문기상인자들의 시공간적 변동성을 명확히 파악하기 위하여 지표해석모형을 구축하였다. 지표해석 모형으로는 Variable Infiltration Capacity (VIC) 모형을 사용하였으며, 모형의 공간 해상도는 10 km, 시간 해상도는 1일로 정하였다. 2007~2010년 기간의 일유량자료를 바탕으로 Isolated Particle Swarm Optimization 알고리즘을 사용하여 모형의 7개 매개변수를 보정하였고, 2011~2014년 기간의 일유량자료를 사용하여 모형을 검증하였다. 보정된 모형은 보정기간과 검증기간 모두에 대하여 0.90의 Nash-Sutcliffe Coefficient값과 0.95의 상관계수를 보였다. 소양강댐유역에 대하여 산출된 인자들은 여름철에 강우가 집중되어있는 우리나라의 계절적인 특성과 기온변화로 인한 장 단파 복사량의 변화와, 지표면 온도의 변화, 이로 인해 피복층에서의 증발과 식생 증산의 변화가 고려되어 총 증발산이 변화하는 경향이 잘 반영된 것으로 나타났다. 산출된 수문인자를 검증하기 위하여 지상관측토양수분자료와 비교하였다. 겨울철을 제외한 4~11월의 비교결과 두 자료의 추세선의 기울기는 1.087로 나타났고, 상관계수는 0.723의 값을 나타냈다. 이러한 본 연구의 결과는 지표해석모형이 우리나라 주요 댐 유역의 수문기상인자의 시공간적인 변화를 정확히 파악하는데 활용될 수 있으며, 나아가서는 더욱 정밀하고 효율적인 수자원계획을 수립하는 데에도 활용될 수 있다는 점을 시사한다.

• 산업기술연구
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• 제19권
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• pp.379-390
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• 1999

The purpose of this study is to investigate the applicability of Nakayasu & SCS method and Clark method to the computation of runoff from the river basin in Soyang watershed. As the result, each runoff was conducted to compare and analyze existing established peak flow model, and to propose a pertinent model.

• 환경영향평가
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• 제20권4호
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• pp.575-583
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• 2011

In this study, the plausible grid size was estimated to increase for efficiency of reservoir management using 3 dimensional water quality model. To validate utilization of a real time water quality management tool, ELCOM-CAEDYM model was applied to Soyang reservoir in korea. 100m grid size can represent the real topography and take out exact analysis results. $400{\times}400m$ grid can be easily used to analysis because of data capacity. Consequently, the grid size of 200m or 300m was recommended to establish 3D model considering the required simulation time and the irrelevance between horizontal grid size and vertical distribution for temperature and turbidity analysis.