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http://dx.doi.org/10.15681/KSWE.2018.34.4.391

Analysis of Variation for Drainage Structure with Flow Direction Methods on the Basis of DEM  

Park, Hye-Sook (Department of Health Environmental, Daejeon Health Science College)
Kim, Joo-Cheol (International Water Resources Research Institute, Chungnam National University)
Publication Information
Journal of Korean Society on Water Environment / v.34, no.4, 2018 , pp. 391-398 More about this Journal
Abstract
The main purpose of this study is to suggest and recommend the more reliable flow direction methods within the framework of DEM and power law distribution, by investigating the existing methodologies. To this end SFD (single flow direction method), MFD (multiple flow direction method) and IFD (Infinite flow direction method) are applied to analyze the determination of a flow direction for the water particles as seen in the Jeonjeokbigyo basin, and then assessed with respect to the variation of flow accumulation in that region. As the main results revealed, the study showed the different patterns of flow accumulation are found out from each applications of flow direction methods utilized in this study. This brings us to understand that as the flow dispersion on DEM increases, in this case the contributing areas to the outlet grow in sequence of SFD, IFD, MFD, but it is noted that the contribution of individual pixels into outlet decreases at that time. In what follows, especially with the MFD and IFD, the result tends to make additional hydrologic abstraction from rainfall excess, as noted due to the flow dispersion within flow paths on DEM. Based on the parameter estimation for a power law distribution, which is frequently used for identify the aggregation structure of complex system, by maximum likelihood flow accumulation can be thought of as a scale invariance factor. In this regard, the combination of flow direction methods could give rise to the more realistic water flow on DEM, as revealed through the separate flow direction methods as utilized for dispersion and aggregation effects of water flow within the available different topographies.
Keywords
DEM; Flow Accumulation; IFD; MFD; Power Law Distribution; SFD;
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Times Cited By KSCI : 2  (Citation Analysis)
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