A geochemical investigation of the Oguni River

Abstract

The Oguni River, which is one of the important tributaries of the Mogami River, starts from the western side of the Ou Mountain Range.
As is often the case with the rivers near the copper mine, the waters of some tributaries in the left side are influenced by the mineral deposits in the catchment area. Such is not the case with the branches in the right side.
So far as the main stream is concerned, the water quality undergoes a remarkable change after joined by the waters issuing from the hot springs in the drainage basin. According to the observations at the fixed station, there exists a linear relationship (positive correlation) between the contents of SO₄^2- and Cl^-. Generally speaking, the increase of the water level tends to decrease the concentrations of the chemical constituents. In the case of melt water, the circumstances are different from this.