STUDY ON THE DATABASE AND THE RECHARGE ACTION OF GROUNDWATER

Physical understanding of subsurface water characteristics is quite important for the efficient use of water resources, since heavy rainfall infiltrates into the underground and much water is being used from the underground through the pump or the well in our lives. From this point of view, we developed a practical tool that can analyze the quantity of the water under water circulation. The model consists of three sub-models: surface model, subsurface model, and database model. In this integrated model, we have also incorporated a function which can precisely evaluate the interaction between river and subsurface and can assess the cultivation water for the paddy field. The model has been applied to the simulation for the Ryochiku plain, Japan. The numerical results on the groundwater level and the river discharge have been compared with corresponding field observations. Good agreements have been obtained.