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성충현 ( Seong Choung-hyun ),박승우 ( Park Seung-woo ),김상민 ( Kim Sang-min ),최자윤 ( Choi Ja-yoon ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
A hydrologic gauging network include a real-time measuring equipment was established within the Balhan watershed. Rainfall, stream water level, flow velocities were monitored at the six gauging stations. For stream flow gauging stations, the stage-discharge relationships were developed. The flow rate of the Balan watershed was 83.60% in 2001 and 48.79% in 2002.
농업소유역의 홍수유출량 추정을 위한 단위도 모형 비교연구
성충현 ( Seong Choung-hyun ),김상민 ( Kim Sang-min ),박승우 ( Park Seung-woo ) 한국농공학회 2008 한국농공학회논문집 Vol.50 No.3
In this study, three different unit hydrograph methods (Snyder, SCS, Clark) in the HEC-HMS were compared to find better fit with the observed data in the small agricultural watershed. Baran watershed, having 3.85㎢ in size, was selected as a study watershed. The watershed input data for HEC-HMS were retrieved using HEC-GeoHMS which was developed to assist making GIS input data for HEC-HMS. Rainfall and water flow data were monitored since 1996 for the study watershed. Fifty five storms from 1996 to 2003 were selected for model calibration and verification. Three unit hydrograph methods were compared with the observed data in terms of simulated peak runoff, peak time and total direct runoff for the selected storms. The results showed that the coefficient of determination (R<sup>2</sup>) for the observed peak runoff was 0.8666~0.8736 and root mean square error, RMSE, was 5.25~6.37㎥/s for calibration stages. In the model verification, R<sup>2</sup> for the observed peak runoff was 0.8588~0.8638 and RMSE was 9.57~11.80㎥/s, which were slightly less accurate than the calibrated data. The simulated flood hydrographs were well agreed with the observed data. SCS unit hydrograph method showed best fit, but there was no significant difference among the three unit hydrograph methods.
염분수지 및 EFDC 모형을 이용한 간척 담수화호 염도변화모의
성충현,Seong, Choung Hyun 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
Forecasting salinity in an estuary reservoir is essential to promise irrigation water for the reclaimed land. The objective of the research was to assess salinity balance and its temporal and spatial variations in the Iwon estuary reservoir which has been issued by its high contents of salinity in spite of desalination process for four years. Seepage flows through the see dikes which could be one of possible reason of high salinity level of the reservoir was calculated based on the salinity balance in the reservoir, and used as input data for salinity modeling. A three-dimensional hydrodynamic model, Environmental Fluid Dynamics Code (EFDC), was used to simulate salinity level in the reservoir. The model was calibrated and validated based on weekly or biweekly observed salinity data from 2006 to 2010 in four different locations in the reservoir. The values of $R^2$, RMSE and RMAE between simulated and observed salinity were calculated as 0.70, 2.16 dS/m, and 1.72 dS/m for calibration period, and 0.89, 1.15 dS/m, and 0.89 dS/m for validation period, respectively, showing that simulation results was generally consistent with the observation data.
HSPF 모형과 호소 물수지를 이용한 미계측 간척 담수화호 수문모델링
성충현,Seong, Choung Hyun 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
This research presents an streamflow modeling approach in a data-scarce estuary reservoir watershed which has been suffered from high salinity irrigation water problem after completion of land reclamation project in South Korea. Since limited hydrology data was available on the Iwon estuary reservoir watershed, water balance relation of the reservoir was used to estimate runoff from upstream of the reservoir. Water balance components in the reservoir consists precipitation, inflow from upstream, discharge through sluice, and evaporation. Estimated daily inflow data, which is stream discharge from upstream, shows a good consistency with the observed water level data in the reservoir in terms of EI (0.93) and $R^2$ (0.94), and were used as observed flow data for the streamflow modeling. HSPF (Hydrological Simulation Program - Fortran) was used to simulate hydrologic response of upstream of the reservoir. The model was calibrated and validated for the periods of 2006 to 2007 and 2008 to 2009, respectively, showing that values of EI and $R^2$ were 0.89 and 0.91 for calibration period, 0.71 and 0.84 for validation period.
하수처리수의 농업용수 재이용에 따른 포장단위 수질영향 분석
성충현,김성재,김성민,김상민,Seong, Choung-Hyun,Kim, Sung-Jae,Kim, Sung-Min,Kim, Sang-Min 한국농공학회 2011 한국농공학회논문집 Vol.53 No.4
The purpose of this study was to analyze the water quality change when wastewater applied to study paddy fields. CREAMS-PADDY (Chemical, Runoff and Erosion from Agricultural Management System) model was used to estimate the field-scale water quality. Simulated results were compared with observed data monitored from Byeongjeom study paddy fields which is located near the Suwon sewage treatment plant in Gyeonggi-do. Significance analysis was performed for the three different irrigation water quality level and five fertilizer reduction scenarios using LSD (Least Significant Difference) and DMRT (Duncan's Multiple Range Test). Total nitrogen was found to be significant for both irrigation water quality level and fertilizer reduction while total phosphorus was not. Annual drainage load for total nitrogen was reduced by 66~92 % compared to irrigation load when treated wastewater irrigated to study paddy fields from 2002 to 2007. Total phosphorus was reduced by 70~86 %.
성충현 ( Seong Choung-hyun ),박승우 ( Park Seung-woo ),김상민 ( Kim Sang-min ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
This paper presents how effective the detention storage is to control floods at a test watershed. HEC-HMS model was applied to simulate the effects of the storages of different levels and installation methods on the flood peak reduction. The results showed that the detention storage may significant reduce the flood peaks, and the effectiveness depends on the sizes of the storage and types of installation. The simulated peak values reduce considerably for the design storm events. The results also showed that alternatives to control flood may be evaluated using the model.
성충현 ( Seong Choung Hyun ),신정범 ( Shin Jung Bum ),장태일 ( Jang Tae Il ),박승우 ( Park Seung Woo ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
In this study, rainfall characteristics was analyzed for a feasibility study of wastewater reuse for agriculture in Jeju island. Selected gauging stations which have long term data are Jeju(north), Seogwipo(south), Gosan(west) and Seongsan(east). While the annual rainfall of Seongsan and Seogwipo was 1,856 mm and 1,821 mm, that of Gosan and Jeju was 1,121 mm and 1,430 mm respectivly. The probability drought analysis was performed with thirty-one years rainfall data for four gauging station. The drought day of 10 year return period was 9~55 days, especially 18-42 days from September to November in Gosan.
성충현,강문성,장태일,박승우,이광야,김해도,Seong, Choung-Hyun,Kang, Moon-Seong,Jang, Tae-Il,Park, Seung-Woo,Lee, Kwang-Ya,Kim, Hae-Do 한국농공학회 2009 한국농공학회논문집 Vol.51 No.1
The objective of this study is to assess the feasibility of wastewater reuse for the vegetable farming. The study region, about 250 ha in size, is located on the west coast of Jejudo, Korea. Major agricultural products of the study area are the cabbage, broccoli, garlic and onion. To confirm the feasibility of wastewater reuse, the drought duration and the water requirement analysis were conducted respectively. The average annual precipitation of the study region (1,121 mm) was smaller than that of Jeju island (1,975 mm). The drought duration for a ten-year return period in October through November was more than 20 days. The water requirement for irrigation was calculated by the FAQ Penman-Monteith method which took into account the cultivated crops, planting system, and meteorological conditions of the study region. The water requirement for a ten-year return period was estimated 4.7 mm/day and the water demand for irrigation was $4,584\;m^3/day$. As a result, the irrigation water for the crops was insufficient during their breeding season, especially in October through November. Thus, the result indicated that the study region required the alternative water supply such as wastewater reuse during the non-rainy season. As drought continues to place considerable stress on the availability of fresh water supplies in the study region, irrigation with reclaimed wastewater will play an important role in helping to meet future water demands.
시스템 다이내믹스를 이용한 하수재이용 유역의 일유출량 모의
정한석,성충현,박승우,Jeong, Han Seok,Seong, Choung Hyun,Park, Seung Woo 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6
This study presents a system dynamics modeling approach to simulate daily streamflow in a watershed including wastewater treatment plant which contributes to irrigation water supply. The conceptual system dynamics model considering the complex and dynamic hydrological processes in the watershed was developed. The model was calibrated and validated each for two years based on observed flow data. Model performances in terms of $E_{NS}$, RSR, PBIAS, and $R^2$ were 0.64, 0.60, -3.6 %, and 0.64 for calibration period, and 0.66, 0.58, -2.6 %, and 0.66 for validation period, respectively, showing an applicability on generating the daily streamflow. System dynamics modeling approach could help better understand the hydrological behavior of the watershed being reused wastewater for agriculture, by providing graphical dynamics of the hydrological processes as well as conventional rainfall-runoff model results.
HSPEXP 모형평가지표 이용한 HSPF 모형의 수문매개변수 보정
김상민,성충현,박승우,Kim, Sang-Min,Seong, Choung-Hyun,Park, Seung-Woo 한국농공학회 2009 한국농공학회논문집 Vol.51 No.4
The purpose of this study was to test the applicability of the HSPEXP model performance criteria for calibrating hydrologic parameters of HSPF. Baran watershed, located at Whasung city, was selected as a study watershed in this study. Input data for the HSPF model were obtained from the digital elevation map, landuse map, soil map and others. Water flow data from 1996 to 2000 was used for calibration and from 2002 to 2007 was for validation. Using the HSPEXP decision-support software, hydrology parameters were adjusted based on total volume, then low flows, storm flows, and finally seasonal flows. Suggested criteria for each model performance variables were referenced from the previous research. For the calibration period, all the HSPEXP model performance criteria were satisfied while two criteria were slightly violated for the validation period.