JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES

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　Hydrologic recession analysis is a traditionally used method to elucidate and model the runoff processes, separate runoff components, and estimate hydrological parameters through analyzing recession parts of hydrograph. Hydrologic recession analysis is also extremely important for long-term low water management. The influence of evapotranspiration on recession has long been reported, but it has rarely been considered explicitly. This study defines evapotranspiration from soil water, i.e., evapotranspiration excluding canopy evaporation, as soil evapotranspiration. We conducted recession analysis based on recession equations taking into account soil evapotranspiration proposed by this researcher, and attempted to estimate the basin-specific recession constant found from basin characteristics such as geology, and seasonal patterns of soil evapotranspiration. Results demonstrate the possibility of estimating basin-specific recession constants and seasonal patterns of soil evapotranspiration from recession curves.

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