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이관재,박기욱,정영훈,정인균,정광욱,전지홍,이지민,임경재,Lee, Gwan Jae,Park, Ki Wook,Jung, Young Hun,Jung, In Kyun,Jung, Kwang Wook,Jeon, Ji Hong,Lee, Ji Min,Lim, Kyoung Jae 한국농공학회 2013 한국농공학회논문집 Vol.55 No.4
Annual average precipitation of Korea is 1,277 mm and around 2/3 of annual precipitation and 74 % of available water resources occurred during monsoon period. In recent years, many agricultural reservoirs have been heightened to increase flood control capacity, reduce flooding damage at downstream areas, and provide sustainable environmental flow during drought period. Thus in this study, the flood control effects of heightening of reservoir banks were simulated with HEC-ResSim and HEC-RAS models. These modes were applied to Bonghak reservoir and it was found that flood control effects were 3~4.5 % with 7 -m heightening. Also, with proper operation (1 m lower of full water level) of reservoir right before the monsoon period, flooding at downstream could be prevented even with design storm of 80 -year recurrence interval. As shown in this study, heightening of agricultural reservoir provides positive effects in flood control and flood damage reduction.
SWAT 모형과 BFlow를 이용한 지하수 함양, 기저유출의 시공간적 변화 분석
이지민 ( Ji Min Lee ),박윤식 ( Youn Shik Park ),정영훈 ( Young Hun Jung ),조재필 ( Jae Pil Cho ),양재의 ( Jae Eui Yang ),이관재 ( Gwan Jae Lee ),김기성 ( Ki Sung Kim ),임경재 ( Kyoung Jae Lim ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.5
Occurrence frequency of flood and drought tends to increase in last a few decades, leading to social and economic damage since the abnormality of climate changes is one of the causes for hydrologic facilities by exceedance its designed tolerance. Soil and Water Assessment Tool (SWAT) model was used in the study to estimate temporal variance of groundwater recharge and baseflow. It was limited to consider recession curve coefficients in SWAT model calibration process, thus the recession curve coefficient was estimated by the Baseflow Filter Program (BFLOW) before SWAT model calibration. Precipitation data were estimated for 2014 to 2100 using three models which are GFDL-ESM2G, IPSL-CM5A-LR, and MIROC-ESM with Representative Concentration Pathways (RCP) scenario. SWAT model was calibrated for the Soyang watershed with NSE of 0.83, and R2 of 0.89. The percentage to precipitation of groundwater recharge and baseflow were 27.6% and 17.1% respectively in 2009. Streamflow, groundwater recharge, and baseflow were estimated to be increased with the estimated precipitation data. GFDL-ESM2g model provided the most large precipitation data in the 2025s, and IPSL-CM5A-LR provided the most large precipitation data in the 2055s and 2085s. Overall, groundwater recharge and baseflow displayed similar trend to the estimated precipitation data.
SWAT모형을 이용한 해안면 만대천 유역의 미래 기후 지하수 함양량 평가
이지민 ( Ji Min Lee ),금동혁 ( Dong Hyuk Kum ),이관재 ( Gwan Jae Lee ),임경재 ( Kyoung Jae Lim ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
최근 이상기후 현상들로 인해 용수 공급이 안정적이지 못한 실정이다. 우리나라 전체 수자원 이용 량 중 농업용수가 45% 이상 차지하고 있으며, 농업용수 이용량 중 지하수 이용량 또한 점차 증가하 고 있는 것으로 분석되었다. 현재 국내에서는 지하수위 저하로 용수부족 및 지하수질 악화, 이로 인 한 건기 하천 생태계 파괴 등과 같은 다양한 문제가 발생하고 있다. 이러한 문제를 해결하기 위하여 지하수 함양량 평가가 수행되어야 하나, 이를 위한 기초자료가 제대로 구축되어 있지 않은 상태이며, 또한 최근 기후변화에 의한 지하수 함양량 변화에 관한 연구도 제한적으로 수행되어 오고 있다. 유역 에서의 지하수 함양량 평가를 산정하기 방법에는 여러 가지 공식이나 HSPF(Hydrological Simulation Program-Fortran), MODFLOW(Modular Ground Water Model), SWAT(Soil and Water Assessment Tool) 모형 등이 사용 될 수 있다. 본 연구에서는 위와 같은 방법 중 유역 수문-수질 모의가 가능 한 SWAT 모형을 이용하여 지하수 함양량을 평가 하였다. 이를 위하여 본 연구에서는 해안면 유역 에 대하 보정된 SWAT 모형과 기후변화 시나리오 자료를 이용하여 지하수 함양량의 시간적·공간 적 변화 특성을 분석하였다. 또한 기후변화정보센터(CCIC)에서 제공하는 기후모델인 A1B 시나리 오를 편의보정(Bias-correction)한 후 미래 기후변화에 따른 지하수 함양량을 분석하였다. 분석 결 과 유역내 다양한 지형, 토양, 토지이용특성에 따라 지하수 함양량에 있어 큰 차이가 있었으며, 기 후변화에 의해 지하수 함양량 또한 많은 변화가 있는 것으로 분석되었다. 본 연구의 결과는 해안 면 유역의 지하수 관리를 위해 유용하게 활용 될 수 있을 것으로 판단된다.
이지민 ( Ji Min Lee ),금동혁 ( Donghyuk Kum ),김영석 ( Young Sug Kim ),감윤즁 ( Yun Jung Kim ),강현우 ( Hyunwoo Kang ),장춘화 ( Chun Hwa Jang ),이관재 ( Gwan Jae Lee ),임경재 ( Jae Lim Kyoung ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.1
Much attention has been needed in water resource management at the watershed due to drought and flooding issues caused by climate change in recent years. Increase in air temperature and changes in precipitation patterns due to climate change are affecting hydrologic cycles such as evaporation and soil moisture. Thus these phenomena result in increased runoff at the watershed. The soil and water assessment tool model has been used to evaluate rainfall-runoff at the watershed reflecting effects on hydrology of various weather data such as rainfall temperature humidity solar radiation wind speed. For bias-correction of RCP data, at least 30 year data are needed. However for most gaging stations only precipitation data have been recorded and very little stations have recorded other weather data. In addition the RCP scenario does not provide all weather data for the SWAT model. In this study two scenarios were made to evaluate whether it would be possible to estimate strearmflow using measured precipitation and long-term average values of other weather data required for running the SWAT. With mcasurcd long -term weather data (scenario 1) and with long-term average values of weather data except precipitation(scenario 2) the estimate streamflow values were almost the same with NSE value of 0.99. Increase/decrease by ±2% ±4% in temperature and humidity data did not affect streamflow. Thus the RCP precipitation data for Hongcheon watershed were bias-corrected with measured long-term precipitation data to evaluate effects of climate change on streamflow. The results revealed that estimated streamflow for 2055s was the greatest among data for 2025s and 2085s. However estimated streamflow for 2085s decreased by 9% In addition streamflow for Spring would be expected to increase compared with current data and streamflow for Summer will be decreased with RCP data. The results obtained in this study indicate that the streamflow could be estimated with long-term precipitation data only and effects of climate change could be evaluated using precipitation data as shown in this study.