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- 저자 : 정광욱 ( Kwang Wook Jung ) (검색결과 97 건)
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정광욱,윤춘경,장재호,전지홍,Jung Kwang-Wook,Yoon Chun-Gyeong,Jang Jae-Ho,Jeon Ji-Hong 한국농공학회 2006 한국농공학회논문집 Vol.48 No.1
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.
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LID시설의 유출량 및 오염부하 저감효율평가를 위한 SWMM모델의 적용
정광욱,정종석,박진성,현경학,Jung, Kwang-Wook,Jung, Jong-Suk,Park, Jin-Sung,Hyun, Kyoung-Hak 한국토지주택공사 토지주택연구원 2017 LHI journal of land, housing, and urban affairs Vol.8 No.4
최근 도시의 확대와 팽창에 따라 불투수층 증가에 따른 물순환의 건전성 약화, 녹지 등 생태계의 파괴 등 사회적인 문제를 해결하기 위한 방안으로 LID 기법이 활용되고 있다. 본 연구에서는 신도시인 아산탕정 분산형 빗물관리 시범지구를 대상으로 SWMM 모텔을 구축하여 LID시설 적용 전후의 유출량 및 오염부하 저감효과에 대한 평가를 실시하였다. 2016년 강우를 대상으로 모의한 결과 배수구역 기준 12.2%, 집수구역 기준 62.0%의 유출저감효과가 있는 것으로 평가되었다. COD오염부하 저감효과 평가 결과 배수구역기준 15.5%, 집수구역 기준 74.9%, TP의 경우 배수구역기준 9.2%, 집수구역 기준 71.4%의 효율을 나타내었다. 아산탕정 지구 내에 설치된 4가지 시설물에 대한 효과분석 결과 효율은 식생수로가 가장 높고 측구형 침투시설이 가장 낮은 것으로 검토되었다. 하지만 이는 시설물의 개소수, 체적을 고려하지 않은 결과로 실제 시설물의 효율을 비교를 위해서는 시설물의 공극률을 고려한 체적을 산정하여 비교하는 것이 합리적이며, 집수면적당 시설물의 공극률을 고려한 체적(V/A)이 낮은 침투도랑 및 측구형 침투시설이 가장 낮은 효율을 나타내었다. SWMM 모델의 LID모듈을 이용하여 물순환 및 오염부하 저감효과를 검토한 결과 정량적인 해석이 가능하였으며, 다양한 시나리오의 검토를 통해 효과적인 LID시설을 설계하는데 활용 기능할 것으로 평가된다. Urbanization can be remarkable affected flood, pollutant loading, ecological system, and green infrastructure by distortion of hydrologic cycle. In order to mitigate these problems in urban, Low Impact Development(LID) technique has been introduced and applied in the world. SWMM model was calibrated with sets of field monitoring data and applied for calculation of runoff and pollutant loading in Asan-tangjung LID city under 2016 rainfall. Runoff reduction of watershed and catchment basins were showed efficiency 12.2% and 62.0%, respectively. Reduction of COD and TP loading also high efficiency in catchment basins were evaluated 74.9 and 71.4%. The results of this study can be used effectively in decision making processes of urban development project by comparing watershed runoff and pollutant reduction by designs of sort of LID technique, LID volume and location.
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정광욱,윤춘경,이인호,이승일,강수만,함종화,Jung, Kwang Wook,Yoon, Chun Gyeong,Lee, In Ho,Lee, Seung Il,Kang, Su Man,Ham, Jong Hwa 한국농공학회 2014 한국농공학회논문집 Vol.56 No.1
Sediment pollutants have been considered an important source for the eutrophication of estuarine reservoir. In this study, the effects of pollutants released from bottom sediment to water column were investigated. Sediment samples were collected each two station from Namyang and Sukmoon estuarine reservoirs in August 2013. The fractionation result of sediment phosphorus indicated that Adsorbed-P ($36.7{\pm}8.84%$) and Nonapatite-P ($29.3{\pm}12.50%$) are the two dominant phosphorus groups in the sediments. For sediment release test, eight sets of acrylic chamber (0.3 m $diameter{\times}1m$ high, with 0.15 m sediment depth) were used with aerobic and anaerobic environment. Under anaerobic conditions, rates of $NH_4-N$ release from the sediments were highly variable, with final concentrations of $NH_4-N$ in the overlying water varying from between about 0.69~1.04 in Namyang and 2.58~4.23 mg/L in Sukmoon reservoir. The $NH_4-N$ release was active at the upstream around the confluence of tributary compared to downstream near the embankment. The $PO_4-P$ release was more obvious than $NH_4-N$ in anaerobic condition. The final $PO_4-P$ concentrations were approximately from two-fold to eight-fold higher than initial concentration. In terms of reservoir water quality management, not only tributary pollutants but also sediment nutrient loading is necessary to consider the water quality contribution.
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BASINS/HSPF를 이용한 화성유역 오염부하량의 정량적 평가
정광욱,윤춘경,장재호,김형철,Jung, Kwang-Wook,Yoon, Chun-G.,Jang, Jae-Ho,Kim, Hyung-Chul 한국농공학회 2007 한국농공학회논문집 Vol.49 No.2
A mathematical modeling program called Hydrological Simulation Program-FORTRAN (HSPF) developed by the United States Environmental Protection Agency (EPA) was applied to Hwaseong watershed. It was run under BASINS (Better Assessment Science for Integrating Point and Nonpoint Sources) program, and the model was validated using monitoring data of $2002{\sim}2005$. The model efficiency of runoff ranged from good to fair in comparison between simulated and observed data, while it was from very good to poor in the water quality parameters. But its reliability and performance were within the expectation considering complexity of the watershed and pollutant sources. The nonpoint source (NPS) loading for T-N and T-P during the monsoon rainy season (June to September) was about 80% of total NPS loading, and runoff volume was also in a similar range. However, NPS loading for BOD ($55{\sim}60%$) didn't depend on rainfall because BOD was mostly discharged from point source (more than 70%). And water quality was not necessarily high during the rainy season, and showed a decreasing trend with increasing water flow. BASINS/HSPF was applied to the Hwaseong watershed successfully without difficulty, and it was found that the model could be used conveniently to assess watershed characteristics and to estimate pollutant loading including point and nonpoint sources in watershed scale.
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정광욱,윤춘경,장재호,김형철,전지홍,Jung Kwang-Wook,Yoon Chun-Gyeong,Jang Jae-Ho,Kim Hyung-Chul,Jeon Ji-Hong 한국농공학회 2005 한국농공학회논문집 Vol.47 No.4
A study was performed to examine the effects of reclaimed-water irrigation on microorganism con-centration in ponded-water of paddy rice plots. Several treatments were used and each one was triplicated to evaluate the change of indicator microorganisms (total coliforms (TC), fecal coliforms FC), and E. coli) concentrations in 2003 and 2004 growing seasons. Their concentrations increased significantly right after irrigation, but decreased about $45\%$ in 24 hours. It implies that agricultural activities such as plowing and fertilizing should be practiced one or two days after irrigation considering health-risks. Treatments with UV-disinfected water irrigation demonstrated significantly lower concentrations than others including control plots where natural surface water was irrigated. The monitoring results from actual paddy rice fields and experimental paddy plots showed that concentrations of indicator microorganisms ranged from $10^2\;to\;10^5$ MPN/100mL. A comprehensive assessment of existing agricultural practices and a thorough monitoring in the field as well as treatment-plots are recommended to make more realistic national guidelines more applicable. UV-disinfected water irrigation reduced microorganism concentrations in paddy fields down to below the concentration of conventional paddy rice culture, and is thought to be an effective and feasible measure fur agricultural reuse of secondary effluent.
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BASINS/WinHSPF 및 EFDC의 한강유역과 팔당호 적용
정광욱 ( Jung Kwang Wook ),윤춘경 ( Yoon Chun Gyeong ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
The WinHSPF model was initially calibrated for water flow and water qualities using Korea Total Maximum Daily Load (KTMDL, 31 stations, 2004~2006) data, and verified for water flow using Ministry of Construction and Transportation (MOCT, 15 stations, 2000~2006) and water quality using Ministry of Environment (MOE, 25 stations, 2002~2006). Water flow and water quality simulation results were also satisfactory over the 5-year period. It is noteworthy that the simulation process for two independent data sets was successful; implying that the calibrated WinHSPF model adequately simulated the watershed over diverse and long-term conditions. Calibration results reasonably reflected with the observed data of water flow, temperature, DO, BOD<sub>5</sub>, and nutrient simulation. Through source assessment, it was found that most of pollutant loading was contributed by nonpoint source pollution expecting some sub-basins. Time varying output from the WinHSPF was applied directly to the EFDC model, which in turn simulated hydrodynamic and water quality, including water depth, green algae, DO, total phosphorus, and total nitrogen. Model calibration was performed during 2004~2005. The output results showed a good agreement between the simulated and the observed data except some outlier. Some deviations were observed in the simulation; however, they were within expectations, considering inherent errors in the input and observed data, as well as the model formulation. Obtaining an acceptable agreement of observed and simulated concentration is essential for the procedure of watershed water quality calibration, maintaining the stream water quality parameters within physically realistic bounds, and the nonpoint loading rates within the expected ranges from the literature. The model developed in this study simulates complex physical, biological and chemical processes. A large number of modeling parameters have been defined based upon the best available data, standard modeling assumptions, and comparisons with relevant literature. It is recommended that the development of this model be continued to synthesize additional field data into the modeling process as such data, and a wide range of WinHSPF coupled with EFDC, becomes available for evaluating TMDL.
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정광욱 ( Kwang-wook Jung ),윤춘경 ( Chun G. Yoon ),장재호 ( Jea-ho Jang ),이광야 ( Kwang-ya Lee ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
Large scale projects of sea-land reclamation have been practiced mainly to enlarge farmland in Korea. Most projects produced estuarine reservoir with dike construction, which might result in water quality problems due to block of natural flowing of stream water to the sea. External loading to the reservoir through the tributaries are particularly concerned water quality management. Total phosphorus (TP), suspended solid (SS), and chemical oxygen demand (COD》were directly proportional to discharge rate. During wet-days, the TP demonstrated high correlation coefficients with SS and COD showing 0.50~0.97 and 0.52~0.99, respectively. During dry-days, correlation among pollutant concentrations was less apparent. The relationships among the pollutants might be used to estimate one pollutant concentration from the other in external loading estimates, and its application to other area could be possible if watershed characteristics are not significantly different. The watersheds studied are mainly non-urban and their land uses are similar to typical watershed of Korean estuarine reservoirs, therefore, the relationships developed in the study might be applicable to water quality management of others.
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