Abstract
Water resources are abundant in volcanic areas, and grasp of water environmental problems is important for conservation and use. Water pollution caused by eruption is characterized by wide range of contamination due to components eluted from volcanic ejecta, and its impact on living things and the economy is great. Based on this, I started studying how the eruption that occurred in Owakudani in Hakone on June 29, 2015 influences the surrounding water environment.
In the survey, AT, WT, pH, RpH, EC, etc. are measured mainly at river, lake and rain water at monthly intervals, and the main dissolved components are analyzed in the laboratory.
In Owakuzawa, Cl-tends to decrease as time passes since the eruption. The Cl-/SO42- ratio at Owakuzawa Shimoyu Bridge decreased from 1.1 at 1507 to 0.2 at 1707. This may be due to the change in the quality of the spring water in the source area due to the increase in volcanic activity, elution of components from the volcanic ejecta released by the eruption, and so on. Hayakawa was influenced by Owakuzawa, and Cl-/SO42- increased at the confluence point.
It turned out that the anion component ratio of Owakazawa changed with the passage of time from the eruption. Currently we are continuing to observe the flow rate, and from now on we will make quantitative considerations.
