http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
박기중,정상옥,손성호,Park, Ki-Jung,Chung, Sang-Ok,Sohn, Seung-Ho 한국농공학회 2004 한국농공학회논문집 Vol.46 No.4
The purpose of this study was to investigate tile effects of pending depth treatment on water balance in paddy fields. Field experiment was performed in an experimental farm in Taegu, southern part of Korea during the rice growing season In 2001, 2002 and 2003. Experimental plots were three 8m ${\times}$ 80m rectangular plots. Three pending depth treatments, very shallow, shallow, and deep were used. Daily values of water balance components were measured in the field. The irrigation amounts measured at the experimental plots showed that the very shallow and the shallow ponded plots required smaller amount than the deep ponded plot. The shallow ponded plot saved irrigation water about 17.7% compared with the traditional deep ponded plot in 2001 The very shallow ponded plot saved irrigation water about 25.7% compared with the traditional deep ponded Plot in 2002, The shallow ponded plot saved irrigation water about 18% compared with the deep ponded plot in 2003.
Scenario-Based Exposure Risk Assessment of Molinate in a Paddy Plot ; (2) Exposure Risk Assessment
박기중,정상옥,Park, Ki-Jung,Chung, Sang-Ok The Korean Society of Agricultural Engineers 2008 한국농공학회논문집 Vol.50 No.4
Exposure risk assessment of pesticide molinate using the RICEWQ model in a rice paddy plot was performed to observe the effects of various water and pesticide management scenarios. Several scenarios were developed to represent the specific water and pesticide management practices of rice cultivation in Korea. The results of the scenario analysis using the RICEWQ model simulation from the previous studies were analysed. The molinate risk for aquatic organisms is evaluated by the ratio of the predicted environmental concentration(PEC) and the predicted no-effect concentration(PNEC). The results showed that the no-effect periods for aquatic organisms for the deep, shallow and very shallow irrigation conditions were 33.3, 28.9 and 25.6 DATs for the lable rate application and 36.4, 33.7 and 30.8 DATs for the double lable rate application, respectively. The higher application rate showed greater exposure risk to the aquatic organisms. Based on this study, the withholding period of molinate practiced in Korea, that is 3 to 4 DATs, must be much longer. The results of this study can be used for the non-point source pollution control and environmental policy making regarding pesticides.
RICEWQ-RIVWQ 연계모형을 이용한 농약 PECs 모의
박기중 ( Park Ki-jung ),정상옥 ( Chung Sang-ok ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
In order to assess the environmental risk of pesticides, information is usually required on the likelihood of exposure of organisms to the constituents of pesticides, expressed as a predicted environmental concentrations (PECs) and the likely effects of the constituents of pesticides on aquatic and terrestrial organisms, expressed as a predicted no-effect concentrations (PNECs). In this paper, the pesticide fate model, RICEWQ alone and coupled with the pesticide movement model, RIVWQ was used to simulate the potential for predicting the environmental concentrations of pesticides in paddy fields and adjacent surface water systems. The RICEWQ model was successfully calibrated against field data in poinding depth for paddy field. For the assessment of importance for water and pesticide management conditions and field scales, the integrated RICEWQ-RIVWQ model was simulated by the scenario analysis. The results of this study can be used as a basic information for assessing the environmental risk of pesticides.
박기중 ( Park Ki-jung ),손성호 ( Sohn Seung-ho ),정상옥 ( Chung Sang-ok ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
The purpose of this study was to obtain optimal amount of groundwater development for a rural small watershed. The optimal amount of groundwater development in this experimental watershed is 13.8 %(0.67 x 10<sup>6</sup>m<sup>3</sup>) of the annual rainfall by SCS-CN method. The Visual MODFLOW analyses showed the optimal amount of groundwater development were 14.9 %(0.72 x 10<sup>6</sup> m<sup>3</sup>) of the annual rainfall.
박기중 ( Park Ki-jung ),정상옥 ( Chung Sang-ok ),( Christen Evan ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
농업 비점오염원 중의 하나인 제초제의 환경기준 설정을 위한 기초자료를 확보하기 위한 적절한 모형의 선정은 많은 시간과 노력을 절감할 수 있을 것이다. 본 연구에서는 논 농약 추적 모형인 RICEWQ 모형을 검증하기 위하여 호주 New South Wales에 위치한 Murrumbidgee Irrigation Area의 포장에서 관측한 논 담수심과 molinate 농도값과 모형 추정값을 비교 · 검토 하여 모형을 검증하였다. 모형의 검증 결과는 다음과 같다. 1) 모형에 의한 담수심 추정값과 관측값을 비교한 결과 최대 오차는 1.8 cm, 오차평균은 0.8 cm, RMSE는 1.0cm로 관측값과 잘 일치하는 것으로 나타났다. 2) 제초제 molinate의 농도 추정값과 관측값을 비교한 결과 최대 오차는 0.11 mg/L, 오차평균은 0.03 mg/L, RMSE는 0.05 mg/L로 관측값과 잘 일치하는 것으로 나타났다. 3) 모형에 의한 제초제의 농도 분석 결과, 살포 후 약 28일이 경과한 후 호주의 Notification Level인 0.0125mg/L 이하로 떨어지는 것으로 나타나 2001년의 경우 살포 후 28일 이전에는 논 담수의 배수관리가 필요한 것으로 판단된다. 이상에서와 같이 RICEWQ 모형은 시험포장의 담수심과 제초제의 운명을 잘 모의하는 것으로 나타났으며, 추후 우리나라의 다양한 환경 및 재배방법에 대해서도 본 모형을 검증한다면 비점오염원 관리를 위한 국내 제초제에 대한 환경기준 설정에도 활용할 수 있을 것으로 판단된다. The objective of this study was to assess the rice pesticide model RICEWQ for its applicability in simulating the herbicide molinate in a paddy field. To verify RICEWQ model, model predicted and observed water depths and molinate concentrations were compared in a paddy field from October to November 2001 in the Murrumbidgee Irrigation area of south eastern Australia. The analysis of the observed and modelled water depths showed that the average error 0.8 cm, the maximum error 1.8 cm, and the root mean square error 1.0 cm. The analysis of the observed and modelled molinate concentrations showed that the average error 0.03 mg/L, the maximum error 0.11 mg/L, and the root mean square error 0.05 mg/L. This results showed that the model was successfully verified against field data on water depths and molinate concentrations for a experimental paddy field and RICEWQ model could be used as a tool for establishing a pesticide environmental regulations in Korea.
박기중 ( Park Ki Jung ),김동주 ( Kim Dong Joo ),송태관 ( Song Tae Kwan ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
The artificial facilities constructed in estuary affect the change of natural flow properties in the vicinity of this construction. The Saemangeum sea dike constructed to store a freshwater connects Gunsan to Buan in Korea. Therefore, tide properties near the Saemangeum Reclamation Area will be changed. However, several researchers have performed the quantitative analysis for the change of tide properties. In this study, the harmonic analysis model, Delft3D-Tide, was used to assess the effect of the tide circumstances in ocean seas surrounding Saemangeum Area.
2 차원 수리동역학적 수치 모형을 이용한 새만금 호 내 유동 해석
박기중 ( Park Ki Jung ),정상옥 ( Chung Sang Ok ),박영진 ( Park Young Jin ),박창규 ( Park Chang Kyoo ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
The objective of the paper was to assess the two-dimensional hydrodynamic numerical model DELFT3D-Flow for its applicability in analyzing the current pattern in the Saemankeum Reservoir after final closure. To verify 2D DELFT3D-Flow model, model predicted and observed tide and tidal current patterns were compared from April to August 2006 in the Saemankeum reservoir at the western coast, Republic of Korea. This results showed that the model was successfully verified against field data on tide and tidal current patterns for the experimental reservoir and DELFT3D-Flow model could be used as a tool for establishing a gate operation guidelines for flood events.