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.