酸性雪の流出モデルに関する基礎的研究

Abstract

The fast that river water turns out to be more acidie in the snowmelting season is known. The phenomenon is called acidic shock. According to the observation, the pH value of the river water increased in the snowmelting season. And the ion concentrations of the snowmelt water decrease in a day.This fact indicates that acidie materials concentrate in the outer part of the snow grains. The aim of this study is to make the model which concludes two processes. One is to compute the snow accumulations, melting and runoff process. Another is to compute acidic materials in the soil and river water. The model is applied to the Takatoki River located at the northern part of Lake Biwa.