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오승영,김진수,오광영,Oh, Seung-Young,Kim, Jin-Soo,Oh, Kwang-Young 한국농공학회 2005 한국농공학회논문집 Vol.47 No.2
Characteristics of concentrations of total nitrogen (TN), total phosphorus (TP), and chemical oxygen demand (COD) pollutant in percolated water at four paddy field sites (Soro, Odong, Munui, and Boeun) were investigated by a nonparametric test. Percolation rate measurement and percolated water sampling were taken during irrigation periods at $5{\sim}10$ day intervals. The normality of percolation rate and pollutant concentrations were examined using histogram, boxplot, and the Kolmogorov-Smirnov (K-S) test. Pollutant concentrations in percolated water showed positively skewed distribution. The median concentrations of pollutant were 1.91 mg/L for TN, 0.021 mg/L for TP, and 6.6 mg/L for COD, which were lower than its arithmetic mean concentrations by $35\%$ for TN, $36\%$ for TP, and $13\%$ for COD. The median concentrations of TN and TP differed significantly among sample sites according to the Kruskal-Wallis test. However, median concentrations were not significantly different among month except for TN and TP of Soro and COD of Odong. The percolation load of pollutants during irrigation periods in the study area were estimated at $3.12{\sim}7.75\;kg/ha$ for TN, $0.033{\sim}0.155\;kg/ha$ for TP, and 10.7 kg/ha for COD, which were much lower than respective values reported in Japan.
오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),김규성 ( Kim Kyu Seong ),권순국 ( Kwun Soon Kuk ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
This study describes the characteristics of concentrations of pollutants such as total nitrogen(T-N), total phosphrous(T-P), and chemical oxgen demand(CODJ at paddy areas during 2-year dry irrigation periods. Most of pollutants concentrations in drainage water are lower than those in irrigation water after early July due to large uptake of pollutants by rice crop and denitrification. For drainage water, the concentrations of pollutants are constant irrespective of discharges and the average T-N/T-P ratios water range from 14 to 44, suggesting that phosphrous is limiting.
오염총량관리 할당부하량 초과지역의 최종 평가기준에 관한 연구
오승영 ( Seung Young Oh ),한미덕 ( Mideok Han ),김석규 ( Seok Gyu Kim ),안기홍 ( Ki Hong Ahn ),김옥선 ( Oksun Kim ),김용석 ( Yong Seok Kim ),박지형 ( Ji Hyoung Park ) 한국물환경학회 2016 한국물환경학회지 Vol.32 No.5
The Total Maximum Daily Load (TMDL) is a watershed management system that involves the establishment of the target water quality, the calculation of permission loading (allocation loading), and the control of total pollutants for each unit watershed. Allocation loading is assessed through the comprehensive implementation assessment of the previous year`s plan. Assessment results are used for follow-up management measures such as the limit of development and updating of TMDL Management Implementation Plans for the next planning period. Although detailed assessment criteria are important, they are not currently available. Therefore, we suggested assessment criteria by comparing two methods(‘integration method` and ‘separation method`) using combination point and non-point discharge loading. We also examined the penalty criteria considering controllable load local government and updating methods of the TMDL Management Implementation Plan for the next planning period.
오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),정구영 ( Jung Gu Young ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
Nutrients behavior were investigated at a paddy fields area(50ro-ri) with large-scaled plots on loam soil during irrigation seasons of 2001~2002. The average concentration of TN, TON and TOP in drainage water was higher than that in irrigation water. On the other hand, TP in irrigation water was higher than that in drainage water. The ratio of a TON to TN accounts for over 90% and the ratio of TOP to TP accounts for 50~70%. Especially, the ratio of TOP to TP in drainage water was bigger than that in irrigation water, suggesting that much of particulate component was reduced due to sedimentation and adsorption in paddy fields plots.
오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),이종진 ( Lee Jong Jin ),오광영 ( Oh Kwang Young ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
Concentration and discharge have been intensively monitored at the drainage canal in a paddy field area during storm-periods. Among 4 storm runoffs, the No. 2 and No. 3 runoff was in the fertilizer application period. The specific load-specific discharge equation L = aQ<sup>b</sup> have different characteristics for the pollutants. The coefficient of b generally shows values of more than 1 for T-N, about 1 for COD<sub>cr</sub> and less than 1 for T-P. For same specific discharge, No. 2 runoff shows higher specific load than other runoffs. For the coefficient of determination of the L-Q equation, COD<sub>cr</sub>, is higher than T-N and T-P. The mean concentration of direct runoff, significantly depending on the storm events, is 0.6 to 8.3 mg/l for T-N, 0.05 to 0.51 mg/l for T-P, and 10.0 to 18.3 mg/I for COD<sub>cr</sub>.
오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),김규성 ( Kim Kyu Seong ),김선종 ( Kim Seon Jong ),윤춘경 ( Yoon Chun Gyeong ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.2
Characteristics of unit loads of pollutants were investigated at a paddy fields area(Soro-ri) with large-scaled plots on loam soil during irrigation seasons of 1999 ∼2000. The average irrigation requirement of experimental paddy area are estimated at over 3,000 mm. The unit loads of pollutants in paddy fields area are determined by subtracting irrigation water load from outflow load (percolated and surface outflow loads). Surface outflow load in rainy days was calculated using the relationships of discharge and load, which are grouped into fertilizing and non-fertilizing periods. The ratios of the surface outflow load in rainy days to the total surface outflow load are 16.4% for T-N, 26.8% for T-P, and 23.3% far COD<sub>cr</sub>. The unit loads of pollutants show month-to-month and year-to-year variations, and monthly unit load of pollutants can show negative values, indicating that the paddy area acts as the pollutants sink. The average unit loads of the pollutants during irrigation seasons were estimated at 18.2 kg/ha fur T-N, 0.31 kg/ha for T-P, and 43.3 kg/ha for COD<sub>cr</sub>, which are smaller than the reported values for Kosei area in Japan.
오승영 ( Oh Seung-young ),김진수 ( Kim Jin-soo ),정구영 ( Jung Gu-young ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
본 논문에서는 1999~2003년의 관개기(4월 중순~9월 하순) 동안 대구획 광역논을 대상으로 논의 수질 정화 기능을 평가하고 영양물질의 유출부하 저감 방안을 제시하였다. 1. 심층 침투수의 TP 평균농도는 0.027 mg/L로 용수와 배수에 비해 매우 작게 나타났다. 이는 지하로 침투하면서 상당량 토양에 흡착되었기 때문으로 사료된다. 2. 순유출부하량이 양(+)인 경우에 논은 배출형(오염원), 음(-)인 경우에 논은 흡수형(정화형)을 나타내는데, 월별 순유출부하량은 6월에 많은 용수량 중간낙수, 장마기 강우 등의 영향으로 가장 높은 값을 나타냈다. 3. 본 연구에서 지표유출량과 순순유출부하량은 양의 상관관계를 보였고 TN은 지표유출량이 422 mm/월 이상, TP는 지표유출량이 약 610 mm/월 이상일 때 순유출부하량은 양(+)이 되는 것으로 나타났다. 4. 본 유역과 국외 논유역에서 측정된 영양물질의 순유출부하량은 강우량의 증가와 함께 증가하는 것으로 나타났다. 관개기간 중 강수량이 TN은 840 mm, TP는 1,130 mm이상일 때 논은 배출형으로 될 가능성이 크게 나타났고, 논에서의 수질정화 기능은 질소보다는 인이 뛰어난 것으로 나타났으며 배수 억제와 같은 물관리를 통하여 논에서의 유출부하를 저감시킬 필요성이 있다. Net outflow flux and unit load of pollutants were investigated at a paddy fields area(Soro-ri) with large-scaled plots on loam soil during irrigation seasons of 1999~2003. Water samples were collected, and inflow and outflow were measured at 5~10day intervals during non-storm periods and at 2~6 hours intervals during storm events. The average concentration of TP in percolated water was much smaller than that in irrigation and surface outflow water likely due to phosphorus absorption capacity of paddy soils. Net outflow flux in study area was significantly correlated with rainfall and surface outflow discharge. Nutrient flux from paddy fields can be abated by reduction in outflow surface discharge.
오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
We investigated net outflow load and unit load of pollutants from a paddy fields area in dry year 2001. Amount of irrigation water in 2001 was about 61-63% of that in previous years 1999 and 2000 due to drought. The net outflow load and unit load of pollutants in 2001 were negative, showing that paddy fields acts as sink of pollutants due to function of water quality purification. The relationship between unit load of pollutants and net surface outflow (= surface outflow - irrigation water) showed positive correlation. The results showed that abatement of surface outflow by appropriate water management contribute to reduce surface outflow load from paddy fields.