Abstract
This paper's purpose is revealing that land use change and climate change impacted for water resources quantity in Toyama prefecture basin. We used Land use data during 1977-2014, Meteorological Agency mesh climate value in 2000 and 2010.For evaluation validity of distributed water balance model we chose Kuronagi obs. Station and Hasunuma obs. Station at upper stream basin and compared with observed value of river flow and analysis value. The result we reproduced the observed value of river flow for the most part.
The result of water balance analysis considered land use change, tendency of underground penetration decrease secular and surface runoff increase. This result was factor that increasing impermeable area as rice field decreased and building site, road and railway progressed. The result of water balance analysis considered climate change, decreasing of water resources availability became clear as decreasing precipitation. If compare with land use change and climate change, it revealed that impact on the water resources by land use change is extremely large.
