P75  River Discharge Simulation by Using Runoff Data of WRF Model Output

Ma, Xieyao, Hiroaki Kawase, Takao Yoshikane, Masayuki Hara, Noriko Ishizaki, Mikiko Fujita, Sachiho Adachi,  Fujio Kimura, Japan Agency for Marine-Earth Science and Technology, Japan, Hiroshi G. Takahashi, Tokyo Metropolitan University, and H. Hatsushika, Toyama Prefectural Environmental Science Research Center

To clarify the possible effects of climate change on water resources in Toyama, we had a numerical investigation of river discharge by using runoff data derived by a regional climate model with a 4.5-km resolution as input data to the river networks in 30 arc seconds resolution.

Five main rivers in Toyama (Oyabe, Sho, Jinzu, Jyoganji and Kurobe) were selected in this study. The river basin area ranges from 368 km2 to 2,720 km2. A hindcast experiment, which to reproduce the current climate was carried out for the two decades, 1980s and 1990s. A future hydrological response to global warming under the 2030s condition was investigated using a pseudo-global-warming method. The results showed that the characteristic of river discharge in seasonal variation could be represented and there were overestimated compared with measured one except the Oyabe River, which was always underestimation. Compared with the reproduced discharges of 1980s and 1990s, the discharges will be increased in winter season from December to March under the projection of 2030s.