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http://dx.doi.org/10.17663/JWR.2021.23.4.277

Use of a Structural Equation Model for the Long-term Evaluation of Hydrological Cycles in the Seolmacheon and Cheongmicheon Basin  

Kim, Soeun (School of Civil, Environmental and Architectural Engineering, Korea University)
Yoo, Chulsang (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, Munseok (School of Civil, Environmental and Architectural Engineering, Korea University)
Song, Sunguk (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Wetlands Research / v.23, no.4, 2021 , pp. 277-286 More about this Journal
Abstract
This study compares the long-term hydrological cycles of the Seolmacheon and Cheongmicheon basin by applying the structural equation model (SEM). These two basins are found different especially in their land-use pattern. Both basins have the actual evapotranspiration data measured by the eddy-covariance method as well as the rainfall and runoff data. The length of the data considered in this study is nine years from 2010 to 2018. The structure of the SEM is determined by considering the correlations among the data as well as the general knowledge on the hydrological cycle. As a result, a total of three SEMs are applied sequentially to analyze their fittings. As irony would have it, two basins are found to be similar in the application of one SEM, but different in the application of another. Especially, when considering the feedback process between precipitation and evapotranspiration, two basins are found to be very different. That is, the feedback process between precipitation and evapotranspiration is found to be significant in the Cheongmicheon basin where the portion of agricultural area (i.e., paddy) is more than 40%.
Keywords
Cheongmicheon basin; Hydrological Cycles; Seolmacheon basin; Structural equation Modeling;
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