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http://dx.doi.org/10.12652/Ksce.2011.31.1B.001

Evaluation of DEM-based Channel Network Delineation Methods on Watershed Drainage System  

Lee, Gi Ha (충남대학교 토목공학과 건설방재연구소)
Yoon, Eui Hyeok (충남대학교 토목공학과 수공 및 환경전공)
Kim, Joo Cheol (한국수자원공사 K-water연구원)
Jung, Kwan Sue (충남대학교 토목공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.31, no.1B, 2011 , pp. 1-11 More about this Journal
Abstract
Channel network delineation from DEM (Digital Elevation Model) is a fundamental pre-process for hydrologic model application since it determines the drainage system in a watershed. This study aims to propose an effective and efficient channel network delineation process and assess the effects of DEM-based channel networks on the watershed drainage system. For these objectives, we applied two methods to generate the channel networks of the Jinan-cheon catchment with $18.28km^2$ from the 20 m resolution DEM: a widely-used area-threshold method and a slope-area threshold method based on the relationship between contributing areas and local slopes. The results showed that the area-threshold method led to unreliable drainage system, which did not satisfy geomorphological laws with respect to drainage density and source area representation whereas the slope-area threshold method provided acceptable results under the geomorphological laws. Our suggestions in this study can give valuable pre-processing information in DEM-based hydrologic modeling.
Keywords
Area-threshold; channel network; DEM; watershed drainage system; geomophological laws; slope-area threshold;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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