Version: 4.42 (June 1995)
TARG-3DS Order No. TPS 24-1
TARG-2DM Order No. TPS 24-2
TARG-2DU Order No. TPS 24-3
TARG-2DH Order No. TPS 24-3
TARGET Series (all models) Order No. TPS 24-5
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TARGET is a well-established family of codes, capable of simulating ground-water flow and chemical-species transport in saturated and variably saturated porous media. TARGET, originally released in the early 1980s, has the ability to handle complex boundary conditions and multiple material properties, sources and sinks. TARGET consists of four independent computer codes for 1) two-dimensional, vertically integrated, confined/ unconfined, transient ground-water flow, and solute transport (TARGET-2DH); 2) two-dimensional vertically oriented (cross section), variably saturated, density coupled, transient ground-water flow, and solute transport (TARGET-2DU); 3) multi-layer (variable layer thickness), confined/unconfined, transient ground-water flow, and solute transport (TARGET-2DM); and 4) three-dimensional, saturated, density coupled, transient ground-water flow, and solute transport (TARGET-3DS). TARGET uses a integrated finite difference approach to minimize numerical dispersion normal to or upstream of the flow direction. A moisture content averaging scheme is used in unsaturated zone calculations to ensure mass balance and numerical convergence. An Iterative Alternating Direction Implicit algorithm is used as the solver in conjunction with an under-over relaxation of the iterative scheme to damp or accelerate the convergence rate of the solution.
The TARGET models can accommodate various physical mechanisms which influence problem hydrodynamics, including: regional or local recharge or discharge (e.g., rivers, wetlands, uplands, evapotranspiration, infiltration); hydraulic and density induced pressure gradients (e.g., recharge/discharge systems, migration of dense contaminants); compressibility of the matrix and water (e.g., changes in storage beneath the water table or in confined situations); variable saturation (e.g., moisture redistribution within impoundments, flow and transport from a spill or landfill to the water table); material property variations (e.g., heterogeneity, anisotropy, hysteresis in the unsaturated zone); all types of boundary conditions to represent river or ocean boundaries, lakes, ponds, evaporation, infiltration, zero-flux boundaries, leakage zones, canals, irrigation ditches, seepage faces, etc.); man made features (injection or extraction wells, impoundments, spills, slurry walls, infiltration barriers, remediation ditches); and mass transport mechanisms (advection, dispersion, molecular diffusion, density effects from contamination or salt water intrusion, viscosity effects, linear equilibrium adsorption, first-order decay).
Each program requires a single input file with specific Fortran data formats. These files can be prepared using a text editor. The programs generate a binary restart/plot file, and a detailed text output file containing an echo of the input data, a summary of model operation, mass balance summaries for flow and transport, and user-selected arrays. The binary restart plot file contains information on heads, velocities and concentrations. The programs come with dedicated postprocessing programs for graphical representation of results. Plotting of contours of scalar variables, vector representations of velocities and fluxes, simulation grid and model boundaries is facilitated by these programs.
Minimum hardware and software requirements:
IBM compatible 80386 or higher microprocessor, at least 4 Mb RAM, DOS 3.3 or higher, hard disk with 10-50 Mb free disk space, depending upon which programs are installed, and math co-processor (no screen graphics).
Optional, but recommended:
16 Mb RAM memory, DOS 5.0, 100 Mb hard drive space, and contouring software such as SURFER by Golden Software, Inc. (not provided).
The programs are described in detail in a comprehensive set of background documents and user manuals. The user manuals contain easy-to-follow input instructions and example problems. The programs have been tested extensively by the authors, some of which test are discussed in detail in the documentation.
There is one single set of documentation for all TARGET modules. All prices include a copy of the complete documentation. If more than one module is ordered, a $100 discount applies to the price of each additional module, with a maximum discount of $200. If all four modules are ordered use TPS 24-5; the price for the complete set of programs includes one copy of the documentation. There is no discount on the price of the complete set.
The TARGET Series of programs have been developed by Dames & Moore, Inc., Denver, Colorado.