[AHW34-P14] A comparative Study on Water Environment of Isolated Islands - Focusing on Islands in Nagasaki Prefecture -
Keywords:Iki Island, Tsushima Island, Goto archipelago, rainwater, water environment
Research method We conducted hydrological observations in the spring and fall seasons from 2014 to 2016.Temperature, water temperature, EC, pH, RpH were measured locally, samples were taken home, TOC measurement and main dissolved components by ion chromatography were analyzed. For rainwater, samples taken every month were analyzed in the same way.
Results and Discussion As a result of survey and analysis, the effects of sea salt on the land water of almost all islands are seen, the contribution of geology to sea salt is larger than that of sea salt as the overall feature of inland water in Ikijima, Shimoshima differed in Shimojima's water quality composition Shimoshima has a remarkable influence of wind salt transfer, the contribution of geology to Goto Islands was seen by the area, it was clear that many nitrate was detected compared to Ikijima and Tsushima became. These are thought to be due to differences in geology, topography, and agricultural form.