• 환경영향평가
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• 제18권2호
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• pp.59-67
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• 2009

Water quality of the Lake Youngrang in the Sokcho City is eutrophic. Jangcheon is the largest inflow source to the lake. Major pollutant sources are stormwater runoff from resort areas and various land uses in the Jangcheon watershed. A storm sewer on the southern end of the lake is also an important pollution source. In this study, water quality modelling for Lake Youngrang was carried out considering the rainfall-runoff pollution loads from the watershed. The rainfall-runoff curves and the rainfall-runoff pollutant load curves were derived from the rainfall-runoff survey data during the recent 4 years. The rainfall-runoff pollution loads and flow from the Jangcheon watershed and the storm sewer were estimated using the two kinds of curves, and they were used as the flow and the boundary data of the WASP model. With the measured water quality data of the year 2005 and 2006, WASP model was calibrated. Non-point pollution control measures such as wet pond and infiltration trench were considered as the alternative for water quality management of the lake. The predicted water quality were compared with those under the present condition, and the improvement effect of the lake water quality were analyzed.

• 전기학회논문지
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• 제66권12호
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• pp.1712-1720
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• 2017

In South Korea, minimum reserve rate, which is to satisfy reliability standard, has been determined by simulation result using WASP. But, it is still controversial whether the level of minimum reserve rate is adequate. Thus, in this study, various analyses of minimum reserve rate are being conducted. WASP uses the probabilistic simulation technique to evaluate whether reliability standard is satisfied. In this process, forced outage rate and maintenance periods of each generator play important roles. Especially, the long-term plan can be varied depending on how maintenance periods deal with. In order to model maintenance periods in the probabilistic simulation technique, WASP uses derating method. However, broad analyses have to be conducted because there are various ways including derating method to model maintenance periods which result in different results. Therefore, in this paper, 3 different maintenance outage rate modeling methods are applied to arbitrarily modeled system based on the basic plan for long-term electricity supply and demand of South Korea. Results show impact of each modeling method on minimum reserve rate.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2000년도 학술발표회 논문집
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• pp.703-708
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• 2000

• 환경영향평가
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• 제8권1호
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• pp.93-105
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• 1999

Lately water quality of Daechong Reservoir has become more eutrophicated than ever before and there has been much concern over especially the eutrophication of the embayment near Daejon and Chongju Water Intake Tower every summer. The purpose of this study is to predict the impact of change in the pollutant loading, flowrate, nitrogen and phosphorus release from sediment, SOD(sediment oxygen demand) upon the water quality of Daechong Reservoir by WASP5/EUTR05 in order to suggest water quality management alternatives. The data of Sep. 1995 were used for the calibration of the model and those of Sep. 1997 was for verification. The result of the modeling can be summarized as follows. 1. The 50% increase(decrease) of pollutant loading has caused that of T-N concentration by 0.10-0.14 mg/l, T-P concentration by 0.003-0.005 mg/l, and CBOD concentration by 0.16-0.18 mg/l. But the ratio of DO change by the change of pollutant loading was relatively small. 2. The sensitivity test of NH4 flux to T-N and that of P04 flux to T-P shows that T-N and T-P concentration were changed more in the epilimnion segments (SEG4, SEG5, SEG6, SEG7) than the other segments. As SOD increases, DO was predicted to decrease more especially in the hypolimnion (SEG9-SEG14). 3. As flowrate increase, the concentration of T-N, T-P, and CBOD were predicted to decrease, but DO concentration increased especially in the hypolimnion segments(SEG11, SEG12, SEG13, and SEG14). As the flowrate changed from $119m^3/sec$ to $50m^3/sec$, the concentration of T-N and CBOD in the hypolimnion was predicted to decrease.

• 대한토목학회논문집
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• 제33권3호
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• pp.975-985
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• 2013

본 연구에서는 도암댐 유역을 대상으로 유역모형과 호소 및 하천모형의 연계를 통해 통합모델링시스템을 구축하였다. 국내 기후 특성상 하절기에 집중되는 강우로 인해 댐의 건설은 홍수조절, 용수확보 및 전력생산 등의 목적에 있어서 불가피하다. 특히 이러한 목적의 댐 형태가 하천과 하천 사이에 위치할 경우에는 연계된 구간을 하나의 유역으로 보고 이를 통합적으로 모의 및 관리 할 수 있는 시스템이 필요하다. 본 연구에서는 도암댐 유역을 대상으로 유역모형인 SWAT 모형을 구축하고 저수지 및 하천의 수리 및 수질 모의를 위해 EFDC-WASP 모형을 구축하였다. 또한 현재 도암댐 상부에서 시범가동 중인 수질개선장치 효율이 반영된 시나리오를 모의하여 통합모델링시스템의 적용성을 검토하였다.

• 대한환경공학회지
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• 제22권4호
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• pp.743-754
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• 2000

WASP5 모형을 새만금호에 적용하여 모형의 매개변수 추정을 수행하였다. 추정방법으로는 수질항목 및 매개변수들을 몇 개의 군으로 나누어, 각 군의 매개변수들을 시행착오법에 의하여 순차적으로 추정하는 방법을 사용하였다. 모의 수질항목으로서 엽록소 a, 질소 순환요소들, 인순환요소들, BOD 및 DO 등을 포함하였으며, 복잡도 4에서 수질을 모의하였다. 새만금 담수호의 전체유역을 수 개의 물수지 단위 소유역으로 구분하여 물수지 분석을 하였다. 본 연구에서는 물수지 분석모형에 의한 1975년부터 1996년까지 22년간 월별 평균유입량을 산정하여 모형의 상류경계단에서의 유량 입력자료로 이용하였다. 1997 및 1998년의 수질측정자료는 계절별 평균치와 함께 계절별 매개변수의 보정 및 검증에 각각 사용하였다. 수질항목 및 관련 매개변수들을 계열별로 분류하여 추정하는 것이 많은 수의 매개변수 추정에 있어서 효율적인 방법임을 알 수 있었다. 모형의 보정 및 검증 결과, 유기물의 비점오염원에 대한 정량적 평가가 필요함을 알 수 있었다.

• 대한환경공학회지
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• 제35권2호
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• pp.101-108
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• 2013

경인아라뱃길은 한강하류와 서해를 잇는 국내 첫 인공운하이다. 아라뱃길 내에는 한강갑문으로부터 유입되는 담수와 서해갑문으로부터 유입되는 해수가 혼합됨으로써 염분 분포 및 성층특성이 발달되면서 복잡한 수리동역학적 특성을 나타낼 수 있으며 그에 따라 수질 특성도 크게 영향을 받을 것으로 판단된다. 본 연구에서는 운하 내의 염분 및 수온을 고려하여 3차원적인 수리동역학적 특성을 예측할 수 있는 EFDC (Environmental Fluid Dynamics Code)모델과 이에 따른 수질현상을 고려할 수 있는 WASP (Water Quality Analysis and Simulation Program)모델을 연계하여 사용함으로써 갑문 운영에 따른 3차원 시공간적 수리 및 수질특성을 예측할 수 있는 시스템을 구축하였다. 해수가 유입되는 서해갑문 측의 수질은 대체적으로 양호한 것으로 나타났으나 한강갑문 방향으로 이동할수록 수질은 점점 악화되는 것을 확인할 수 있었다. 또한 봄철 및 가을철에 경인아라뱃길 주운수로 내에서는 DO가 2 mg/L 이하로 감소되는 등 빈 산소층이 형성되었으며, 체류시간 증가에 의한 BOD에 의한 DO소모가 가장 큰 원인으로 작용하는 것으로 추정된다. 따라서 운하 내의 빈산소 현상을 제어하기 위해서 자체적으로 BOD 농도를 개선하기 어려운 경우 수체의 체류시간을 단축시켜서 운영하는 방법을 선택하는 것이 바람직할 것으로 판단된다.

• 한국농공학회지
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• 제42권5호
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• pp.94-102
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• 2000

Investigated was the effectiveness of a constructed wetland system on water quality in Hwa-Ong estruarin reservoir, located in Hwasung-Gun, Kyunggi-Do. Procedures for estimation of pollutant loading from watershed and required area for natural systems, and simulation of corresponding reservoir water quality were reviewed. Generally, simulated reservoir water quality was within the reasonable range, and about 15% of total polder farmland was required to meet the agricultural water quality standards. The model was applied based on the current loading condition without additional treatment systems. Wetland system is an ecologically sound treatment system. Therefore, natural systems can be an alternative measure for water quality improvement in polder projects. The area for natural systems was estimated using literature value which might be acceptable at the planning stage. However, pilot system and its experimental data are requisite for large scale field application. WASP5 was proved to be a useful and versatile model, and its application to estuarine reservoir water quality simulation was thought to be appropriate.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.527-533
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• 2005

Recently reservoir is polluted by concentrative development of urbanization. Accordingly, the prediction of water quality has import meaning for protecting of water quality pollution. This study was carried out to predict water quality of Gyung Cheon reservoir by WASP5. We have established an integrated system on the basis of web, which predicts the future quality of water through water quality model, WASP5 based on information of water environment in a reservoir for agriculture, uniting expert system which supports the determination to set up measures for improving the quality of water to cope with the result.

• 상하수도학회지
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• 제11권3호
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• pp.112-123
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• 1997

The Anyang stream is one of the Han river in Seoul Metropolitan area. It is 35.1km long, has a basin area of $282.26km^2$ and touches seven cities of Kyounggido and some of Seoul Metropolitan area. The situations of Anyang stream have resulted in severe stream water pollution problems. The purpose of this study were to measure the hydraulic characteristics and water quality, to make the countermeasures to achieve the stream water quality, to suggest the future conditions to improve water quality trough the Hydrodynamic and Water Quality Modal(WASP4). As the result of Anyang stream water quality forecsat, they are follows. Sewerage systems in the watershed of the Anyang stream have to be amended for wrong systemn and constructed in the upstream area of Anyang. The discharge of industrial wastewater has to be throughly controlled from the upstream area of the Anyang stream. Hydrodynamic and Water Quality Model(WASP4) for this study revealed the future water quality of the Anyang stream by computer simulation.