In recent localized heavy rainfalls have been arising from abnormal climate change. People are concerning about damages with increasing the frequency of flooding. Therefore, we need to understand river hydraulic characteristics and management to reduce damage from flooding. To study hydraulic characterization of Sincheon experimental catchment HEC-RAS (Hydrologic Engineering Center River Analysis System) model which provided by U.S Army Corps of Engineers (USACE) was applied. This study analyzed and compared water level the frequency flood for 100 years and 200 years by clark unit Hydrography. The change of the water level of Daejeon bridge, Sincheon bridge and Singi bridge showed increased for all conditions. The flow rate for the Daejeon bridge and the Sincheon bridge showed an increase, but the Sinki bridge showed a decreasing flow rate overally, except for 1hour-100 years. The verification result showed that the model was able to simulate the water level with 0.4709 coefficient of determination and error ration ranging from 1 to 3%.

1. 서론
 2. 재료 및 방법
  2.1. 대상유역 현황
  2.2. HEC-RAS 모형
  2.3. 부등류 기본 방정식
 3. 모형의 적용
  3.1. 자료 구축
  3.2. 수치모형 입력자료 산정
  3.3. 유역면적, 유로연장, 유역평균 폭, 유역형상계수
  3.4. 홍수재해 관리
  3.5. HEC-RAS 구축
 4. 모의 결과 및 고찰
  4.1. 빈도별 홍수량 수위변화
  4.2. 빈도별 홍수량 유속변화
  4.3. 범람모의
  4.4. 수위-유량곡선의 검증
 5. 결론
 REFERENCES

• 박병기(국립환경과학원 한강물환경연구소, Han-River Environment Research Center) | Byeongky Park
• 이명구(국립환경과학원 한강물환경연구소, Han-River Environment Research Center) | Myunggu Lee
• 홍창수(국립환경과학원 한강물환경연구소, Han-River Environment Research Center) | Changsu Hong
• 이재관(국립환경과학원 한강물환경연구소, Han-River Environment Research Center) | Jaekwan Lee
• 이영준(국립환경과학원 한강물환경연구소, Han-River Environment Research Center) | Young Joon Lee Corresponding author
• 최중대(강원대학교 지역건설공학과, Department of Regional Infrastructures Engineering, Kangwon National University) | Joongdae Choi