猪苗代湖におけるpHの長期的推移に関する検討

摘要

The scenario of the long term pH transition in the Lake Inawashiro was discussed from the field observations and simulated analysis. The complete mixing model on mass conservation based on ion balance of the lake was build by the field data. From the analysis on thirty-five years, it was concluded that the increase of pH was caused by two categories: the first one is the former period until 1998 that was affected by increase of precipitation due to the climatic chang in the basin; the second is the period after 1998 that caused rapid neutralization, affected by the imbalance phenomenon of the total hydrogen ions (H~+) which decreased by 8% in sulfuric ions (SO_4~(2-)) from the basin.