In watershed problems, the current distributions of groundwater levels and river flow rates are quite unknown, but we need them for simulation. To create the current conditions in the objective area, we took the following procedures.
Firstly we set the fully-water saturated condition with hydrostatic pressure in underground, together with completely dry conditions at the surface. Calculating from this initial condition and under the annual averaged precipitation and temperature, air-water two phase flows was traced by transient simulation for long period of time. During this computation, groundwater level around the mountainous area gradually decreased, and unsaturated zone is developed, by groundwater discharge (air intrusion) to the surface. At the same time, groundwater discharge formed river networks. Eventually, the conditions of the fluids reached to an equilibrium state in which the precipitation and runoff out to the external of the model balanced under the topography and geologic/hydraulic structures.In order to simulate the nature as it is, reproducing the natural field and various physical processes as precisely and consistently as possible in a computer is very important. This is the distinctive approach of GETFLOWS in the modeling of natural system. It is significantly different from the modeling of artificial objects, such as man-made structures, because artificial structures are easily grasped the entity.
The computer model, which is created to describe the fluid motion in accordance with the physical principles of surface/subsurface fluid motion analyzes and visualizes primary behavior of the nature. This is the “Numerical Simulation of a Natural System” that leads the people to a deeper understanding of the field and a new interpretation and revelation.
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