The Hokuriku region, located in the northwestern part of the main island of Japan is known as a heavy snowfall region in the world. It is predicted that the changes in snow fall and melt due to the global warming will have great effects on water resources in this region. The various types of hydrologic and meteorological data such as precipitation, runoff, solar radiation, air temperature and snow depth are being observed in our experimental catchment and discharge data in a large mountainous river as well as irrigation data are collected for water use analysis in the region. In our report, a model of snow fall and melt and a hydrologic model are proposed to predict and discuss the effects of the global warming on water resources, especially on irrigation water.
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