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2019 Vol.61, Issue 4 Preview Page
Improvement of Cross-section Estimation Method for Flood Stage Analysis in Unmeasured Streams

미계측 하천의 홍수위 해석을 위한 단면 추정 기법 개선

Sng Min Juna
,
Soon Ho Hwnga
,
Jung-Hun Songb
,
Si Nae Kimc
,
Soon-Kun Choid
,
Moon Seong Kange†
전 상민a
,
황 순호a
,
송 정헌b
,
김 시내c
,
최 순군d
,
강 문성e†
aPhD Student, Department of Rural Systems Engineering, Seoul National University
bResearch Scholar, Department of Agricultural and Biological Engineering & Tropical Research and Education Center, University of Florida
cUndergraduate Student, Department of Rural Systems Engineering, Seoul National University
dResearcher, Climate Change and Agroecology Division, National Institute of Agricultural Sciences
eProfessor, Department of Rural Systems Engineering, Research Institute for Agriculture and Life Sciences, Institute of Green Bio Science and Technology, Seoul National University
a서울 대학교 농촌 시스템 공학과 박사 과정 학생
b플로리다 대학교 농업 생물 공학부 및 열대 연구 교육 센터 연구 학자
c서울 대학교 농촌 시스템 공학과 학생
d국립 농업 과학원 기후 변화 농업과 연구원
e서울 대학교 녹색 생명 과학 연구소 농업 생명 과학 연구원 농촌 시스템 공학과 교수
† Corresponding author Tel.: +82-2-880-4582 Fax.: +82-2-873-2087 E-mail: mskang@snu.ac.kr
2019. pp. 11-22
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Abstract

The objective of this study was to improve the cross-sectional area and height estimation method using stream width. Stream water levels should be calculated together to simulate inundation of agricultural land. However, cross-sectional survey data of small rural rivers are insufficient. The previous study has developed regression equations between the width and the cross-sectional area and between the width and the height of stream cross-section, but can not be applied to a wide range of stream widths. In this study, cross-sectional survey data of 6 streams (Doowol, Chungmi, Jiseok, Gam, Wonpyeong, and Bokha stream) were collected and divided into upstream, midstream and downstream considering the locations of cross-sections. The regression equations were estimated using the complete data. R2 between the stream width and cross-sectional area was 0.96, and R2 between width and height was 0.81. The regression equations were also estimated using divided data for upstream, midstream and downstream considering the locations of cross-sections. The range of R2 between the stream width and cross-sectional area was 0.86 - 0.91, and the range of R2 between width and height was 0.79 ? 0.92. As a result of estimating the cross-sections of 6 rivers using the regression equations, the regression equations considering the locations of cross-sections showed better performance both in the cross-sectional area and height estimation than the regression equations estimated using the complete data. Hydrologic Engineering Center - River Analysis System (HEC-RAS) was used to simulate the flood stage analysis of the estimated and the measured cross-sections for 50-year, 100-year, and 200-year frequency floods. As a result of flood stage analysis, the regression equations considering the locations of cross-sections also showed better performance than the regression equations estimated using the complete data. Future research would be needed to consider the factors affecting the cross-sectional shape such as river slope and average flow velocity. This study can be useful for inundation simulation of agricultural land adjacent to an unmeasured stream.

Keywords
Unmeasured stream
stream cross-section
regression equation
HEC-RAS
flood stage analysis
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Information
  • Publisher :The Korean Society of Agricultural Engineers
  • Publisher(Ko) :한국농공학회
  • Journal Title :Journal of Korean Society of Agricultural Engineers
  • Journal Title(Ko) :한국농공학회논문집
  • Volume : 61
  • No :4
  • Pages :11-22
  • Received Date : 2019-03-07
  • Revised Date : 2019-05-22
  • Accepted Date : 2019-05-22
  • DOI :https://doi.org/10.5389/KSAE.2019.61.4.011
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