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정재운,윤광식,주석훈,최우영,이용운,류덕희,이수웅,장남익,Jung, Jae-Woon,Yoon, Kwang-Sik,Joo, Seuk-Hun,Choi, Woo-Young,Lee, Yong-Woon,Rhew, Doug-Hee,Lee, Su-Woong,Chang, Nam-Ik 한국농공학회 2009 한국농공학회논문집 Vol.51 No.6
In this study, pollutant loads delivery ratio by flow duration in Hwangryoung A watershed was estimated. The delivery ratio was estimated with measured data by Ministry of Environment(MOE) and the regression equation based on geomorphic parameters. Eight day interval flow data measured by the MOE were converted to daily flow to calculate daily load and flow duration curve by correlating data of neighboring station which has daily flow data. Regression equation developed by previous study was tested to study watershed and found to be satisfactory. The delivery ratios estimated by two methods were compared. For the case of Biochemical oxygen demand(BOD), the delivery ratios of low flow condition were 7.6 and 15.5% by measured and regression equation, respectively. Also, the delivery ratios of Total phosphorus(T-P) for normal flow condition were 13.3 and 6.3% by measured and regression equation, respectively.
비가림 조건에서 시비에 대한 논담수 중 총질소 및 총인 농도 반응
정재운,최우정,윤광식,김한용,곽진협,임상선,장남익,허유정,Jung, Jae-Woon,Choi, Woo-Jung,Yoon, Kwang-Sik,Kim, Han-Yong,Kwak, Jin-Hyeob,Lim, Sang-Sun,Chang, Nam-Ik,Huh, Yu-Jeong 한국관개배수위원회 2007 한국관개배수논문집 Vol.14 No.1
Temporal changes in total nitrogen (T-N) and phosphorus (T-P) concentrations in paddy floodwater in response to fertilization under rain-shielding pot and small-scaled field conditions were investigated. On the basis of the changing patterns, suggestions for the use of fertilization factors, such as days after fertilization, in developing models for the estimation of T-N and T-P loads from paddy fields were made. Total N concentration was susceptible to fertilization, showing a peak concentration right after fertilization followed by a decreasing pattern with the elapse of days after fertilization. The decreasing pattern of T-N concentration followed the first- order kinetics, indicating that the models are likely to be an exponential equation using days after fertilization as an independent variable. Comparison between the pot and field experiments conducted with soils different in soil fertility revealed that indigenous soil N concentration significantly affected T-N concentration, and this suggests that soil N status can be used as the second variable for the models. Meanwhile, temporal changes in T-P concentration did not respond to P fertilization as sensitively as T-N. In combination with other published results, our study suggests that rainfall intensity and other factors associated with farming activities that are likely to cause disturbance of soil particles containing P may be used as possible variables for the models.
논 강우사상 평균농도(EMC) 결측 자료 추정 방법 비교
정재운 ( Jung Jae Woon ),윤광식 ( Yoon Kwang Sik ),최우정 ( Choi Woo Jung ),최우영 ( Choi Woo Young ),진소현 ( Jin So Hyun ),이수형 ( Lee Soo Hyung ),김동호 ( Kim Dong Ho ),장남익 ( Chang Nam Ik ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
Missing data could be estimated by interpolation using observed data. Linear, flow weighted linear, and Lagrangina interpolation metehds were tested to the estimation of missing pollutant concentrations from paddy fields. The accuracy of the each method was evaluated by using field data collected from 2004 to 2007 in Hampyung site within Yeongsan river basin. Flow weighted linear interpolation showed the best results among three methods while Lagrangina interpolation methods found to be inaccurate.
정재운 ( Jung Jae Woon ),최우정 ( Choi Woo Jung ),윤광식 ( Yoon Kwang Sik ),임상선 ( Lim Sang-sun ),곽진협 ( Kwak Jin Hyeob ),오승규 ( Oh Seung Kyu ),김보민 ( Kim Bo Min ),최진규 ( Choi Jin Kyu ),조재영 ( Cho Jae Young ),김영주 ( 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
This study was conducted to develop universal models for loading estimate from paddy in Youngsan and Sumjin river watersheds. Factors associated with precipitation and fertilization were strongly correlated with pollutant loads and models were developed using factors precipitation amount, precipitation days and days after fertilization as parameter. The estimated load and measured values showed comparable results. Some measures for the improvement of the models were also suggested.
국내 논 오염부하 연구 결과 종합을 통한 부하특성 고찰
정재운 ( Jung Jae Woon ),윤광식 ( Yoon Kwang Sik ),최우정 ( Choi Woo Jung ),최우영 ( Choi Woo Young ),최동호 ( Choi Dong Ho ),이수형 ( Lee Soo Hyung ),김동호 ( Kim Dong Ho ),장남익 ( Chang Nam Ik ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
The objective of this study was to compile measured nutrient load data from paddy fields and pollutant load characteristics from paddy fields considered using compiled nutrient load data in the South Korea. For study period, statistical analyses with a variety of parameters(soil, fertilizer, hydrology factors) revealed that T-N load from paddy was significantly correlated with inflow amount(rainfall and irrigation amount). However, T-P load from paddy showed low correlation with parameters. Study results indicate that T-N load from paddy could be controlled by water management practices.