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RISS 인기검색어
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- 저자 : 정재운(Jae Woon Jung) (검색결과 141 건)
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정재운,장정렬,최강원,임병진,이영재,강재홍,박혜린,조소현,Jung, Jae-Woon,Jang, Jeong-Ryeol,Choi, Kang-Won,Lim, Byung-Jin,Lee, Young-Jae,Kang, Jae-Hong,Park, Hye-Lin,Cho, So-Hyun 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2
For efficient water quality management of Saemangeum lake, it is very important to accurately analyze discharged load characteristics using investigated pollution sources data from Saemangeum watershed. Investigation of pollution sources was conducted from 2003 to 2007. In this study, pollution sources are largely classified into human population, livestock, industry, and land use. Discharged loads of BOD, T-N and T-P from classified pollution sources were calculated by Korea TMDL (Total Maximum Daily Load) technical guideline. The calculated results showed that the major sources of BOD and T-N were land use, human population, livestock, and industry in order. However, the major sources of T-P were livestock, land use, human population, and industry in order. Our results clearly show that pollution sources of the priority management for water quality enhancement in the Saemangeum lake has represented land use and livestock.
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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.
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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.
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정재운,장정렬,정지연,최강원,임병진,김상돈,김갑순,윤광식,Jung, Jae-Woon,Jang, Jeong-Ryeol,Jung, Ji-Yeon,Choi, Kang-Won,Lim, Byung-Jin,Kim, Sang-Don,Kim, Kap-Soon,Yoon, Kwang-Sik 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.1
The HSPF (Hydrological Simulation Program-Fortran) model was applied to Mangyeong river watershed to examine its applicability through calibration using monitoring data. For the model application, digital maps were constructed for watershed boundary, land-use, Digital Elevation Model of Mangyeong river watershed using BASINS (Better Assessment Science for Intergrating point and Nonpoint Sources) program. The observed runoff was 1976.4mm while the simulated runoff was 1913.4mm from 2007 to 2008. The model results showed that the simulated runoff was in a good agreement with the observed data and indicated reasonable applicability of the model. In terms of water quality, trends of the observed value were in a good agreement with simulated value despite its model performance lower than expected. However, its reliability and performance were with the expectation considering complexity of the watershed, pollutant sources and land use intermixed in the watershed. Overall, we identified application of HSPF model as reliable evidence by model performance.
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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.
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화학비료 및 퇴비 시용에 따른 논 담수의 T-N, T-P, COD 농도 비교
정재운 ( Jung Jae Woon ),최우정 ( Choi Woo Jung ),윤광식 ( Yoon Kwang Sik ),김한용 ( Kim Han Yong ),곽진협 ( Kwak Jin Hyeob ),임상선 ( Lim Sang Sun ),이선일 ( Lee Sun Il ),김아라 ( Kim A Ra ),장남익,이수형 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
Composted livestock manure (referred to as compost) with a high nutrient concentration is a widely used organic input in organic farming systems. Due to the lack of guideline for standard application rate of compost, however, it tends to be applied at a rate over the crop nutrient requirement. In this context, paddy applied with compost may affect surface water quality more adversely than paddy receiving synthetic fertilizer at the standard rate. As drainage water quality is directly affected by that of floodwater in paddy, comparison of pollutant concentration in floodwater between synthetic fertilizer (conventional) and compost (organic) application could provide some insight into whether organic farming using compost is truly environment-friendly in terms of water pollution or not. Overall, Total N concentration was significantly higher in the fertilizer than in the compost treatments up to 2 weeks of basal fertilization, thereafter such difference was not observed. Meanwhile, TP and COD concentration were higher in the compost than in the fertilizer treatments up to 4 weeks of basal fertilization. Our study shows that compost application can decrease N loss but increase P loss via surface run-off and further suggests that a fertilization strategy to reduce P efflux that is the limiting factor of eutrophication from compost-applied paddy should be developed.
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농촌유역 유량-유달율 단순회귀식을 이용한 주암호 상류유역의 유달율 추정가능성 평가
정재운 ( Jae Woon Jung ),임병진 ( Byung Jin Lim ),최동호 ( Dong Ho Choi ),최유진 ( Yu Jin Choi ),이경숙 ( Kyoung Sook Lee ),김영주 ( Young Joo Kim ),김갑순 ( Kap Soon Kim ),장남익 ( Nam Ik Chang ),윤광식 ( Kwang Sik Yoon ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.10
The objective of this study is to evaluate Flow Pollutant load delivery ratio equations developed from rural watershed on main subwatersheds within Juam Lake. Two regression equations for BOD and three equations for T P were evaluated on Bosung cheon, Dongbok cheon, Songgwang cheon, Naenam cheon, and Sinpyeon cheon. The results show that estimation of BOD delivery ratio using flow delivery equation is reliable when relative composition of discharge load of pollutant sources of a watershed is similar to those of watershed where the equation developed. On the other hand, application of regression equation for T P was feasible when the landuse pattern and relative composition of discharge load of pollutant sources of a watershed is similar to those of watershed where the equation developed.
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