Effect of Climate Seasonality on Hydrological Partitioning of the Watershed

Abstract

In this study, the seasonal effect of climate on the hydrologic partitioning of the watershed was analyzed using Horton index. Horton index is to serve as quantified value on hydrologic partitioning, and was estimated using the soil moisture probability density function in this study. The probability density of the soil moisture was stochastically simulated using the meteorologic data at Seoul, Daegu, Busan and Jeju observation site. As a result, it could be seen that the seasonality had an effect on reducing Horton index. Seasonality could be thought to inhibit the vegetation water use efficiency, considering positive relationship between Horton index and the vegetation water use efficiency. However, much more than usual precipitation in seoul with a wet climate and much less than usual precipitation in daegu with a dry climate tended to disappear to the influence of seasonality on Horton index.