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임경재 ( Lim Kyoung-jae ),최예환 ( Engel Bernard A ),최중대 ( Choi Ye-hwan ),김기성 ( Choi Joong-dae ),신용철 ( Kim Ki-sung ),허성구 ( Shin Yong-cheol ),류창원 ( Heo Sung-gu ),( Lyou Chang Won ) 한국농공학회 2005 한국농공학회 학술대회초록집 Vol.2005 No.-
Accelerated soil erosion is a worldwide problem because of its economic and environmental impacts. To effectively estimate soil erosion and to establish soil erosion management plans, many computer models have been developed and used. The Revised Universal Soil Loss Equation (RUSLE) has been used in many countries, and input parameter data for RUSLE have been well established over the years. However, the RUSLE cannot be used to estimate the sediment yield for a watershed. Thus, the GIS-based Sediment Assessment Tool for Effective Erosion Control (SATEEC) was developed to estimate soil loss and sediment yield for any location within a watershed using the RUSLE and a spatially distributed sediment delivery ratio. SATEEC was enhanced in this study by developing new modules to:1) simulate the effects of sediment retention basins on the receiving water bodies, 2) prepare input parameters for the Web-based sediment decision support system using a GIS interface. This easy-to-operate SATEEC system can be used to identify areas vulnerable to soil loss and to develop efficient soil erosion management plans.
도시화에 따른 유출과 비점원 오염 영향을 평가하기 위한 L-THIA/NPS
임경재 ( Kyoung-Jae Lim ),버나드엥겔 ( BernardA. Engel ),김영식 ( Young-Sug Kim ),최중대 ( Joong-Dae Choi ),김기성 ( Ki-Sung Kim ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.4
The land use changes from non-urban areas to urban areas lead to the increased impervious areas, consequently increased direct runoff and higher peak runoff. Urban areas have also been recognized as significant sources of Nonpoint Source (NPS) pollution, while agricultural activities have been known as the primary sources of NPS pollution. Many features of the L-THIA/NPS GIS, L-THIA/NPS WWW system have been enhanced to provide easy-to-use system. The L-THIA model was applied to the Little Eagle Creek (LEC) watershed in Indiana to evaluate the accuracy of the model. The L-THIA/NPS GIS estimated yearly direct runoff values match the direct runoff separated from U.S. Geological Survey stream flow data reasonably. The R<sup>2</sup> and Nash-Sutcliffe values are 0.67 and 0.60, respectively. The L-THIA estimated runoff volume and total nitrogen loading for each land use classification in the LEC watershed were computed. The estimated runoff volume and total nitrogen loading in the LEC watershed increased by 180% and 270% for the 20 years. Urbanized areas -"Commercial", "High Density Residential", and "Low Density Residential"- of the LEC watershed made up around 68% of the 1991 total land areas, however contributed more than 92% of average annual runoff and 86% of total nitrogen loading. Therefore, it is essential to consider the impacts of land use change on hydrology and water quality in land use planning of urbanizing watershed.
Google Map과 WAMIS 자료를 이용한 직접유출/기저유출 분리 시스템의 개발
임경재 ( Lim Kyoung Jae ),박윤식 ( Park Younshik ),김종건 ( Kim Jonggun ),허성구 ( Heo Sung Gu ),신용철 ( Shin Yongchul ),유동선 ( Yoo Dong Sun ),김기성 ( Kim Ki-sung ),최중대 ( Choi Joongdae ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
The Geographic Information System has been widely used in every aspect of our lives. Many attempts have been made using freely available Google Map API, which provides various GIS and other functionalities with high-resolution satellite images all over the world. These high resolution data by the Google Map is very efficient in locating target area of interest compared with vector dataset. Therefore, the Google Map was used to develop Web GIS interface in locating the gaging station in Korea. The Web-based Hydrograph Analysis Tool (WHAT) was enhanced using the Google Map interface in this study. The Google Map interface was linked to the WAMIS web site for automatic retrieval of daily flow data for automatic baseflow separation Also, the Google Map WHAT interfaces were extended for 48 states in the US (http://www.EnvSys. co.kr/~what, http://cobweb.ecn.purdue.edu/~what/WHAT_GOOGLE). The biggest advantage of using the Google Map interface is that system developers do not need to install Web GIS system on the server, which is sometimes either expensive or heavy for the server. Also, numerous Google Map API can be integrated into the system with minor modifications, enabling very cost-effective Web GIS application. The easy-to-use Google Map interface WHAT system can be efficiently used in calibrating and validating hydrologic and water quality models. The Korea Department of Environment water quality data will be linked to the WHAT system for automatic analysis of water quality trends and pollutant loads characteristics.
SWAT모형을 이용한 수량-수질-수생태 통합 모델링 기법
임경재 ( Kyoung Jae Lim ),이관재 ( Gwanjae Lee ),한정호 ( Jeongho Han ),이동준 ( Dongjun Lee ),이서로 ( Seoro Lee ),양동석 ( Dongseok Yang ),최유진 ( Yujin Choi ) 한국농공학회 2019 한국농공학회 학술대회초록집 Vol.2019 No.-
유역 관리를 위한 유량 및 수질 분석, 수질 개선을 위한 오염저감기법 평가 등 다양한 목적을 위하여 HSPF(Hydrological Simulation Program - Fortran), SWAT(Soil and Water Assessment Tool), APEX(Agricultural Policy/Environmental eXtender) 등dml 유역 단위 수문 및 수질 모형을 활용한 연구가 진행되고 있다. 이와 더불어 수문 및 수질 모의 정확도를 향상시키기 위하여 모형을 개선하고 새로운 모의 기술을 개발하는 연구도 지속적으로 진행되고 있다. 이러한 연구의 일환으로 본 연구에서는 국내 유역을 대상으로 유량 및 수질 모의 정확도를 향상시키기 위하여 SWAT 모형을 대상으로 국내 경작지 특성을 반영할 수 있도록 토양 관련 인자 추출 방법, 토양유실량 산정 공식 등을 개선하여 수질 모의 정확도를 향상시켰다. 또한 유량 및 수질 모의 정확도를 높이기 위하여 국내 하천단면 특성을 반영하여 하천단면 산정 방법을 개선하였다. 그리고 이렇게 개선된 SWAT 모형을 통해 모의한 수심 및 유속 결과를 바탕으로 수생태 건강성 평가를 위해 사용되는 서식처 접합도 지수(Habitat Suitability Index, HSI)를 산정하여 수생태를 간접적으로 평가할 수 있는 수량-수질-수생태 통합 모델링 기법을 제시하였다.