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http://dx.doi.org/10.12652/Ksce.2010.30.5B.471

Revisiting Horton Index Using a Conceptual Soil Water Balance Model  

Choi, Daegyu (부경대학교 환경공학과)
Kim, Sangdan (부경대학교 환경공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.5B, 2010 , pp. 471-477 More about this Journal
Abstract
In this study, the variability of the Horton index which is ratio of vaporization and wetting water is investigated using a conceptual soil water balance model. From the proposed model, the steady-state soil water probabilistic density function is derived through meteorological and watershed characteristics and then the sensitivity of Horton index to the precipitation occurrence rate and the mean of wet day precipitation is examined. As a result, the inter-annual variability of the Horton index is lower than that of precipitation and they showed the strong negative correlation. It is also shown that although precipitation is not varied, the Horton index can be varied due to the fluctuation of the precipitation occurrence rate and the mean of wet day precipitation. In addition, it is presented that there is a non-linear relationship which has a critical point switching proportional or inverse relationship between the Horton index and two main characteristics of precipitation process.
Keywords
ecohydrology; horton index; soil water;
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