GGSD Program Details for HOTWTR

HOTWTR

Category	Groundwater flow (3D)
Publisher	US Geological Survey
Platform	DOS
Status	Public domain
Description	HOTWTR is a block-centred finite difference model for simulating 3D steady-state groundwater flow and heat transport in an isotropic, heterogeneous confined aquifer system with uniform thermal properties and no change of state. The interblock transmissivities are calculated as the harmonic mean of the adjacent blocks. Driving forces on the system are external hydrologic conditions of recharge from precipitation and fixed hydraulic head boundaries. Heat flux includes geothermal heat flow (in-flux), conduction from aquifer to the land surface, advection (heat conveyed by water) from areal recharge, and advection to or from fixed-head boundaries. The IGWMC version includes the effects of pumping and recharging wells, heat in-flux from recharging wells and heat loss through pumping wells. The program uses an iterative procedure that alternatively solves the groundwater-flow and heat-flow equations, updating advective flux after solution of the groundwater flow equation, and updating hydraulic conductivity after solution of the heat flow equation. The coupling is based on linear interpolation of hydraulic conductivity-viscosity-temperature tables. A utility is included to prepare 2D head and temperature distribution files for graphic postprocessing. It can handle various grid sizes, limited by a maximum of 200 elements in either direction.
Cost	US Dollars 120
Data formats supported	None stated
Supplier in United States of America	International Ground Water Modeling Center