ABSTRACT
Firstly, the river basin is modeled with a multimesh and multilayer-typed runoff model combined with Geographical Information System (GIS) data. As the whole river basin must be considered, the basic mesh consists of squares and only one and straight channel exists in a mesh according to the digital elevation map. The mountain, paddy fields, and urbanized zones are decided with their occupation ratios under the classified infiltration rate. Regarding the paddy field, the intake discharge volume from river, the distribution procedures and storage (or overflow) processes are formulated through the linear storage method concept. Secondly, the concentrations of water qualities in the river channel are
calculated through diffusion and emission processes. As the water temperature is also one of the most important factors for creatures in rivers, it is analyzed by considering the heat balance using air temperature, soil temperature, and heat conductivity between atmosphere, groundwater, and soil. Finally, the impact of global warming on water resources is estimated under the assumption of global warming scenarios.
