Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Estimating Ungauged River Section for Flood Stage Analysis

홍수위 해석을 위한 미측정 하천 단면 추정

  • Shin, Sat Byeol (Department of Rural Systems Engineering, Seoul National University) ;
  • Kang, Moon Seong (Department of Rural Systems Engineering, Research Institute of Agriculture and Life Sciences, Institute of Green Bio Science and Technology, Seoul National University) ;
  • Jun, Sang Min (Department of Rural Systems Engineering, Seoul National University) ;
  • Song, Jung Hun (Department of Rural Systems Engineering, Seoul National University) ;
  • Kim, Kyeung (Department of Rural Systems Engineering, Seoul National University) ;
  • Ryu, Jeong Hoon (Department of Rural Systems Engineering, Seoul National University) ;
  • Park, Jihoon (Department of Rural Systems Engineering, Seoul National University) ;
  • Lee, Do Gil (Department of Rural Systems Engineering, Seoul National University) ;
  • Lee, Kyeong-Do (National Academy of Agriculture Science, Rural Development Administration)
  • Received : 2016.04.04
  • Accepted : 2016.08.30
  • Published : 2016.09.30
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Abstract

The objective of this study was to develop the simple method to estimate ungauged river section for flood stage analysis. Damage prediction should be prioritized using hydrological modeling to reduce flood risk. Mostly, the geographical data using hydrological modeling depends on national river cross-section survey. However because of the lack of measured data, it is difficult to apply to many local streams or small watersheds. For this reason, this study suggest the method to estimate unguaged river cross-section. Simple regression equations were derived and used to estimate river cross-section by analyzing the correlation between the river cross-sectional characteristics (width, height and area). The estimated cross-sections were used to simulate flood level by HEC-RAS (Hydrologic Engineering Center's River Analysis System). The applicability of this method was verified by comparing simulated flood level between measured and estimated cross-section. The water surface elevation of the flood stage analysis was 6.56-7.24 m, 5.33-5.95 m and 6.12-6.75 m for measured cross section, for estimated cross section and for estimated cross section based on DEM elevation, respectively. Further study should consider other factors for more accurate flood stage analysis. This study might be used one of the guidelines to estimate ungauged river section for flood stage analysis.

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