• 한국산학기술학회논문지
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• 제12권3호
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• pp.1465-1472
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• 2011

평택호의 수질개선 대책을 수립하기 위하여 호수 내 수질조사를 2회 수행하였으며, 상류 유역의 부하량 삭감에 따른 호소 내 수질개선 효과를 파악하기 위하여 WASP/EUTRO5 모형을 사용하여 시뮬레이션 하였다. 현재의 부하량이 장래에도 지속이 되는 경우에는 호소 내 수질이 상류 유역의 개발에 따른 오염부하량의 증가로 수질이 더욱 더 악화되는 것으로 나타났다. 이에 본 연구에서는 다양한 부하량 삭감 대책을 수립하여 장래의 수질을 예측하였으며, 대안 6가 다른 대안에 비하여 호소의 수질농도를 낮추는 데 크게 기여하는 것으로 나타났다. 그러나, 대안 6의 경우에도 2016년에 호소 내 COD 농도가 9.74 mg/L로 호소수질환경기준 약간 나쁨(4등급, COD 8 mg/L 이하)에도 미치지 못하는 것으로 나타났으며, 2021년에도 유사한 경향을 나타내었다. 대안 6에 부하량을 추가로 삭감하여도 호소의 수질개선 효과는 미미하며 경제적인 측면에서도 적합하지 않은 것으로 나타났다.

• 한국농공학회논문집
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• 제47권7호
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• pp.57-66
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• 2005

The Hydrological Simulation Program - FORTRAN (HSPF) was modified to simulate nonpoint pollutant loadings from paddy fields using a field experimental data collected during 2001-2002. The concept of a 'dike height' was added in a modified HSPF code, named HSPF-Paddy, to consider the function of retaining water by a weir at the field outlet. The effect of fertilization on the variances of nutrients on the soil surface and shallow soil layer was described mathematically with a Dirac delta function (or first-order kinetics). As confirmed through model verification, the HSPF-Paddy modifications were shown to represent the function of retaining water, varied ponded water, and surface runoff by forced drain during both rainy and non-rainy seasons and reasonably predicted the water balance and nutrients behavior in paddy fields. It is a distributed watershed model which, with the paddy modifications, can now simulate nonpoint pollutant loadings where paddy fields are dominant, and it can be used to evaluate the effects of paddy fields on the water quality at a basin scale, and assess the impacts of proposed BMPs applied to paddy fields.

• 한국물환경학회지
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• 제21권2호
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• pp.184-189
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• 2005

Impacts of non-point source pollution on water quality are well known. In this paper, effects of land use, precipitation characteristics, discharge characteristics on non-point source pollutant loadings at urban, agricultural and forestry watersheds were discussed. Rainfall runoffs from fifteen rainfall events were sampled and analysed at two urban watersheds, one rural watershed, and one forestry watershed. EMCs (Event Mean Concentration) were calculated based on monitored flow rates and concentrations. Statistical analysis carried out with runoff loadings and affecting variables indicated that runoff loadings are weakly correlated with the rainfall intensity and the dry days before rainfall events while showed no correlations with rainfall depth nor runoff quantity. By comparing EMCs between study watersheds on log-normal cumulative probability scale, EMCs ranking were in the descending order of urban watershed>agricultural watershed>forestry watershed for SS, TCOD, TN, and TP.

• 농촌계획
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• 제7권1호
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• pp.77-88
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• 2001

In order to evaluate the applicability of GWLF model which can efficiently estimate non-point and point source pollutant loadings in rural watershed including urban district, the model was applied to an experimental watershed. The model was calibrated using observed data such as daily runoffs, sediment yields, T-N, and T-P. Simulated daily runoffs and sediment yields by the model using calibrated parameters were in food agreement with the observed data. There were difference between the simulated and observed nutrient loading which was considered resonable. The simulated results by the model showed that T-N, T-P and sediment yields were dependent on the amount of stream runoff discharge and land use. GWLF model is believed to applicable to estimate amount of pollutant loading of non-point source pollution for the water qualify control of agricultural watersheds.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.689-694
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• 1999

This study estimated average yearly watershed pollutant loading by using SWMM(Storm Water Management Model) which is one of the nonpoint source quality models. Two sites were measured discharge and water quality at dry period and wet period. The rainfall data is used from 1989 to 1998 . During a decade, the average year watershed pollutant loading, which is SS, BOD5 , TN, TP, were 2.39E+06kg, 0.92E +05kg, 2.53E+05kg, 2.66E+04kg respectively. During dry period, SS, BOD5 TN, TP loadings were 1.89E+05kg, 1.7E+05kg, 1.04E+05kg, 1.11E+04kg, and during wet period 1.89E+05kg, 1.17E+05kg, 1.04E+05kg, 1.11E+04kg respectively so wet period loading are more than dry day loadings.

• Spatial Information Research
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• 제1권1호
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• pp.39-53
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• 1993

지리 정보시스템(Geographical Information System)을 이용하여 도심지 Non Pount Source오염 물질의 양이 오염원 종류별로 확인되고 적절하한 오염감소를 위한 대책이 마련되었다. 경험에 의한 공해물질 예측모델을 운용하기 위한 모든 입력 자료들이 도심지의 거리 구획별(Street block)별로 제공되어 각 거리 구획별 오염량이 계산되었다. 계산된 오염량은 각 우수 배출구별로 합산되어 오염량이 많은 지역이 판명되었다. 또한 오염량을 줄이기 위하여 인공호수를 만들기 위한 적지분석이 수행되었으며, 그에 따른 비용분석이 이루어졌다. 본 연구는 지형정보시스템의 도심지 공해연구에의 기여도를 입증시켜 주었다.

• 한국농공학회논문집
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• 제48권1호
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• pp.91-102
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• 2006

Most projects of tideland reclamation with dike construction produce estuarine reservoirs, which may result in water quality problems due to blocking of natural flow of stream water to the sea. External loadings to the reservoirs through tributaries are major concerns in a concerned water quality management. The water quality of a reservoir is greatly influenced by watershed drainage, and accurate estimation of pollutant is indispensable for in the reservoir management. Concentrations of the microorganisms in stream water and conventional parameters were monitored in the 13 water quality monitoring sites located in a rural watershed of Hwaong estuarine reservoir. The indicator of microorganisms showed strong correlation between them, and regression equations with $R^2\geq0.70$ may be used fur estimating one from other microorganisms. The relationships between water quality parameters obtained in this study may be used to infer one unknown pollutant concentrations from the measured pollutant loadings. This methodology could be applied to other areas where the watershed characteristics are not significantly different from the study area. High concentrations of nitrogen was observed in water quality monitoring sites affected by urban land uses and numbers of livestock in wet day as well as dry day, due to the influent of diffuse sources.

• 한국수자원학회논문집
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• 제45권11호
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• pp.1081-1091
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• 2012

가뭄, 홍수와 같은 이상기후에 따른 낙동강 유역의 수문과 수질에 미치는 영향을 평가하기 위해 강우 시나리오기반의 장기유출 유역모의를 통해 지표유출과 오염부하량 발생 특성을 살펴보았다. 전반적으로가뭄년도에서는지표유출량감소에 따라 오염부하량 감소현상을, 홍수년도에는 강우유출 증가에 따른 부하량 증가를 나타냈으나, 상류유역의 댐 직 하류와 같은 특정유역에서는 가뭄 시 댐 운영으로 인한 방류효과와 토양수분량의 변화 등의 물리적 요인들로 인해 SS부하량의 증가현상이 나타났다. 가뭄에 따른 SS의 농도변화는 유량변화에 따라 민감하게 반응하여 가뭄년도의 평수량 및 갈수량 시기에 높은 농도분포를 나타내었고 T-P는 상대적으로 본류구간보다는 유량이 비교적 적은 지류구간에서 높은 농도범위를 나타내었다. 반면, 홍수년도의 경우SS와T-P 모두 기준년도와 유사한농도범위에서 완만한형태의 변화를보였다. 또한, 유출량이 적은 건기 시에는 SS 부하량 유출도 감소하지만 유출량이 증가할수록 부하량이 급격히 증가하는 반면, T-P의 경우 건기 시에 부하량 유출이 크고 강우 시에는 오히려 감소하여 건기일수와 강우패턴에 지배적으로 각기 다른 영향을 받는 것으로 판단된다.

• 한국농공학회논문집
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• 제52권1호
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• pp.1-11
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• 2010

Generation and transportation of runoff and pollutant loads within watershed generated eutrophication at Daecheong reservoir. To improve water quality at Daecheong reservoir, the best management practices should be developed and applied at upper watersheds for water quality improvement at downstream areas. In this study, two small watersheds of upper Daecheong reservoir were selected. The Long-Term Hydrologic Impact Assessment (L-THIA) model has been widely used for the estimation of the direct runoff worldwide. To apply the L-THIA ArcView GIS model was evaluated for direct runoff and water quality estimation at small watershed. And the Web-based Hydrograph Analysis Tool (WHAT) was used for direct runoff separating from total flow. As a result, the $R^2$ (Coefficient of determination) value and Nash-Sutcliffe coefficient value for direct runoff comparison at An-nae watershed were 0.81 and 0.71, respectively. And the $R^2$ value and Nash-Sutcliffe coefficient value at Wol-oe were 0.95 and 0.93. The $R^2$ value of BOD, TOC, T-N and T-P at An-nae watershed were BOD 0.94, TOC 0.81, T-N 0.94 and T-P 0.89. And the $R^2$ value of BOD, TOC, T-N and T-P at Wol-oe watershed were BOD 0.80, TOC 0.93, T-N 0.86 and T-P 0.65. The result that estimated pollutant loadings using the L-THIA ArcView GIS model reflected well the measured pollutant loadings except for T-P in Wol-oe watershed. With L-THIA ArcView GIS model, the direct runoff and non-point pollutant (NPS) loadings in the watershed could be analyzed through simple input data such as daily rainfall, land uses, and hydrologic soil group.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.701-707
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• 1999

This study was initiated to collect background pollutant data for rural watersheds. The effluent/run-off polutant load and run-off ratio of the study areas were calculated and the two types of regression equations, L=a$.$Q+b and L=c$.$Qd where L and Q are the pollutant load(L) and discharge (Q), were derived. We acquired that the correlation coeffcients of the two types of regression equations were over than 90% except for BOD . Therefore, L-Q equations would be a measure to predict water quality of rural watersheds.