GETFLOWS is a general-purpose terrestrial fluid-flow simulator which has been developed with the aim of comprehensive fluid flow modeling. Its practical use for qualitative and quantitative assessments of water related problems is multiple.The fluid dynamics in GETFLOWS is based on the generalized Darcy’s law for multi-phase and multi-component fluid-flow system. One of the characteristic features of GETFLOWS is to compute surface and subsurface coupled fluid-flows including contaminant and heat transport. Various types of interactions between surface water and groundwater, water and air, freshwater and saltwater can be fully calculated by GETFLOWS.These features allow GETFLOWS simulator to be applied in many kinds of actual field situations which become obvious the interaction between surface and subsurface environment. Evaluating the impact of tunnel excavation on the surface/subsurface water environment, and the long-term fluctuation of available groundwater resources caused by urbanization or climate changes are two typical applications of GETFLOWS.
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