In Jeju island, runoff has frequently happened when the rainfall depth is over a threshold value. To simulated this characteristic rainfall-runoff model structure has to be modified. In this study, the TRSM (Threshold Runoff Simulation Method) was developed to overcome the limitations of SWAT in applying to the hydrologic characteristics of Jeju island. When the precipitation and soil water are less than threshold value, we revised the SWAT routine not to make surface/lateral or groundwater discharge. For Hancheon watershed, the threshold value was set as 80% of soil water through the analysis of rainfall-runoff relationship. Through the simulation of test watershed, it was proven that TRSM performed much better in simulating pulse type stream flow for the Hancheon watershed.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. SWAT-K 모형의 개요
  2.2. SWAT-K 모형의 구조
  2.3. 모델 입력 자료 구축
  2.4. 한계유출 모의기법 개발
 3. 결과 및 고찰
  3.1. 기존 모형에 의한 분석
  3.2. 한계유출 모의기법 개발 및 적용
 4. 결 론
 참 고 문 헌

• 정일문(한국건설기술연구원 수자원연구실) | Il-Moon Chung (Department of Water Resources Research, Korea Institute of Construction Technology) Corresponding Author
• 이정우(한국건설기술연구원 수자원연구실) | Jeongwoo Lee (Department of Water Resources Research, Korea Institute of Construction Technology)
• 김지태(한국건설기술연구원 수자원연구실) | Ji-Tae Kim (Department of Water Resources Research, Korea Institute of Construction Technology)
• 나한나(한국건설기술연구원 수자원연구실) | Hanna Na (Department of Water Resources Research, Korea Institute of Construction Technology)
• 김남원(한국건설기술연구원 수자원연구실) | Nam-Won Kim (Department of Water Resources Research, Korea Institute of Construction Technology)