蔵王火山の酸性河川酢川による溶存物質の流送について

概要

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The Su-kawa River in the Zao Volcano has ever been famous for poisonous acid water. It takes the origin at the bottom of the Takayu explosion crater. Therefore, supplied with a large amount of acid thermal water gushing there, this river displays a strongly acid reaction. The quality of water is characterized by the abundance of dissolved minerals which are represented by free sulfuric acid and aluminum sulfate. The yearlong observation reveals that there exists a linear relationship between the concentration of sulfate ion and acidity. The same is true to the correlation between dissolved silicate and the water temperature. Through the same water year, the transportation of ions in solution was also observed. Regarding the ions except silicate, mineral discharge is approximately proportional to the square root of flow rate. In the case of silicate, its discharge is proportional to flow rate. Annual mineral discharge through the channel is estimated at 50, 000 tons. It must be noted that the Su-kawa River transports 25, 000 tons (about half of total discharge) of free sulfuric acid in a year. This may be a measure of the activity of this volcano.
地理科学学会の論文