CLIMATE CHANGE IMPACT ON RIVER FLOW OF THE TONE RIVER BASIN, JAPAN

Future river flow changes in the Tone River basin, Japan, were investigated using a fine resolution distributed hydrologic model and the MRI-AM20km projection output, which is simulated under the A1B climate change scenario. Multiple dam reservoir operations and current water usage information were also considered for realistic river flow simulations. The future water usage and reservoir operation was assumed to be the same as under current conditions. Analysis results show that the river flow change downstream of the basin seems to be insignificant compared to the area upstream of the basin; however, more frequent water shortage days are expected in the future, especially at the Tone-Ozeki station. Revised dam reservoir operation rules should be prepared unless the current water demand changes properly in the future