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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.
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.
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.
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.
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.
정재운 ( Jung Jae-woon ),윤광식 ( Yoon Kwagn-sik ),최수명 ( Choi Su-myung ),최진규 ( Choi Jin-kyu ),조재영 ( Cho Jae-young ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
상수원 농촌유역의 부하특성을 분석하기 위해 주암호 유역내 소유역인 외남천 유역을 선정하여 2001년 5월부터 2003년 9월까지 수문 및 수질 모니터링을 실시하였다. 2. 조사기간 동안 평균 수질농도는 T-N의 경우 강우시 2.15mg/L 비강우시 2.11mg/L로 강우, 비강우시 모두 4급수 이상의 수질이었고, T-P의 수질농도의 경우 강우시 0.022mg/L, 비강우시 0.01mg/L로 비강우시 1급수에서 강우시 3급수 이상 수질로 떨어짐을 알 수 있었다. 농촌지역은 강우시 수질은 평상시에 비해 T-N의 경우 큰 변화가 없으나 T-P의 경우 수질이 크게 악화됨을 알 수 있었다. 3. 조사유역의 강우시 부하량은 T-N의 경우 34.24kg/ha, T-P의 경우 0.48kg/ha로 나타났으며, 비강우시 부하량은 T-N의 경우 633kg/ha, T-P의 경우 0.09kg/ha로 나타났다. 농촌지역의 경우 점원부하의 영향보다 강우시 비점오염에 의한 오염부하가 지배적임을 알 수 있었다. 4. 원단위법에의해 산정된 부하량은 T-N의 경우 0.56kg/ha, T-P의 경우 3.69kg/ha로 나타났으며, 실측 T-N부하량은 40.57kg/ha, T-P 부하량은 0.56kg/ha로 나타났다. 주암호 T-N부하량은 원단위 발생부하량보다 더 큰부하가 유입되고, T-P부하량의 경우는 유달부하량이 훨씬 적은 것으로 나타났다. 5. 조사유역의 전체오염부하량 중 논에서의 오염부하량은 T-N의 경우 15%, T-P의 경우 45%로 나타났다. 주암호 녹조현상을 일으키는 제한인자인 인의 경우 농경지 부하가 큰 비중을 차지하고 있는 것으로 나타났다. A monitoring study has been conducted to identify hydrologic conditions, water quality and nutrient loading characteristics of small watershed in Juam Lake. Climate data of the watershed was collected; flow rate was measured and water quality sampling was conducted at the watershed outlet for this study. Water quality data revealed that T-N concentrations were not much varied between storm and base flow period while T-P concentrations were increased a lot during storm period compared to base flow period. Major portion of runoff amount discharged by a few storm events a year and nutrient loading showed apparent seasonal variation. Observed water quality exceeded water quality standard, but relatively low compared to wastewater. Huge runoff amounts were inflowed in short-term intermittently. Water quality improvement couldn't be achieved by treatment facilities due to above conditions. Therefore, water quality improvement by abating nonpoint source pollution in rural watershed of monsoon climate should be focused on source control. T-P losses from paddy field consist significant amount of total load from study watershed and management of drainage from paddy field is considered to be important for preventing algal blooming problem in Juam Lake.
SWAT 자동보정기능을 이용한 새만금유역에서의 유출량 모의
정재운 ( Jae Woon Jung ),장정렬 ( Jeong Ryeol Jang ),임병진 ( Byung Jin Lim ),이영재 ( Yeong Jae Lee ),김갑순 ( Kap Soon Kim ),강재홍 ( Jae Hong Kang ),박혜린 ( Hye Lin Park ),조소현 ( So Hyun Cho ),윤광식 ( Kwang Sik Yoon ) 한국수처리학회(구 한국수처리기술연구회) 2011 한국수처리학회지 Vol.19 No.1
Application of auto-calibration tool of the Soil and Water Assessment Tool(SWAT) model was evaluated for long-term stream flow simulation from the Samangeum watershed. Hydrologic parameters calibration for basin scale such as Samangeum watershed is quite challenging task since huge variations of hydrologic properties of HRU`s. In this study, the sensitivity analysis of hydrologic parameters was initially conducted to evaluate auto-calibration tool of the SWAT model. The most sensitive parameters were: channel effective hydraulic conductivity(CH_K2), SCS Curve Number II value (CN2), surface runoff lag time(SURLAG), base flow alpha factor (Alpha_Bf), soil evaporation compensation factor(ESCO), and available water capacity (Sol_Awc), respectively. After sensitivity analysis, some important parameters were selected for SWAT model optimization. Calibration of selected parameters was conducted using auto calibration tool of SWAT model over the Saemangeum Watershed. The comparison between the observed and simulated stream flow indicated that there was a good agreement between the observed and simulated discharge, which was verified by coefficient of determination (R2) and Nash Sutcliffe efficiency (NSE) greater than 0.5. We found that auto-calibration tool of SWAT model was reliable for the optimization of parameters reflecting Saemangeum Watershed conditions.
논으로부터 배출되는 유량가중평균 수질농도의 적정 확률분포 선정
정재운 ( Jae Woon Jung ),최동호 ( Dong Ho Choi ),윤광식 ( Kwang Sik Yoon ) 한국환경영향평가학회 2014 환경영향평가 Vol.23 No.4
In this study, we analyzed probability distribution of EMCs (Event Mean Concentration) of COD, TOC, T-N, T-P and SS from rice paddy fields and compared the mean values of observed EMCs and the median values of estimated EMCs (EMC50) through probability distribution. The field monitoring was conducted during a period of four crop-years (from May 1, 2008, to September 30. 2011) in a rice cultivation area located in Emda-myun, Hampyeong gun, Jeollanam-do, Korea. Four probability distributions such as Normal, Log-normal, Gamma, and Weibull distribution were used to fit values of EMCs from rice paddy fields. Our results showed that the applicable probability distributions were Normal, Log-normal, and Gamma distribution for COD, and Normal, Log- Normal, Gamma and Weibull distribution for T-N, and Log-normal, Gamma and Weibull distribution for T-P and TOC, and Log-normal and Gamma distribution for SS. Log-normal and Gamma distributions were acceptable for EMCs of all water quality constituents(COD, TOC, T-N, T-P and SS). Meanwhile, mean value of observed COD was similar to median value estimated by the gamma distribution, and TOC, T-N, T-P, and SS were similar to median value estimated by lognormal distribution, respectively.