Water Resources Applications Software

Geochemical || Ground Water || Surface Water || Water Quality || General

Summary of GAUSS

       gauss - An analytical solution for two-dimensional ground-water
               solute transport in an infinite-width system with uniform
               flow and a solute source having a gaussian concentration

       The program GAUSS computes the analytical solution to the two-
       dimensional solute-transport equation for an infinite-width system
       with a solute source having a gaussian concentration distribution.

       The computer program calculates the concentration for the two-
       dimensional system based on the equation given in Wexler (1992a, p.
       38). The concentration can be calculated for different times and
       spatial locations.

       Version 1.1 1996/04/03 - Code restructuring and clean up: use of
          consistent spacing; use of upper and lower case variable names;
          statement labels renumbered; comment statements altered to be
          consistent; use of Hollerinth data in FORMAT statements removed;
          all variables and routines declared; duplicate code placed in new
          routines; interactive prompting for graphics output devices
          added.  Bug fixed in contour routine related to contours at the
          left edge of the plot.

       Version 1.0 1990/04/03 - Initial published version.

       The program requires data on advective velocity, dispersion
       coefficient, spatial information, temporal information, and boundary
       concentrations.  Optional data may include a first-order solute-
       decay coefficient.

       Output is the calculated concentrations at specified points in time
       and space. A plotting option exists to view the output as graphs.

       pgm_name is written in Fortran 77 with the following extensions:
       use of include files and reference to compiler-dependent system date
       and time routines.  The program requires the file glq.pts
       (provided), which contains normalized roots and weights of the
       Legendre polynomials.  A script program is provided to facilitate
       connection of the program with the glq.pts file.  Graphics are coded
       using Computer Associates' DISSPLA library references.  Generally,
       the program is easily installed on most computer systems that have
       access to the DISSPLA graphics library.  Alternatively, graphics can
       be disabled and data can be easily extracted from the program output
       and plotted using graphic presentation programs.  The code has been
       used on UNIX-based computers.
       Wexler, E.J., 1992a, Analytical solutions for one-, two-, and three-
          dimensional solute transport in ground-water systems with uniform
          flow: U.S. Geological Survey Techniques of Water-Resources
          Investigations, book 3, chap. B7, 190 p.

       Wexler, E.J., 1992b, Analytical solutions for one-, two-, and three-
          dimensional solute transport in ground-water systems with uniform
          flow -- Supplemental Report: Source codes for computer programs
          and sample data sets: U.S. Geological Survey Open-File Report
          92-78, 3 p., 1 computer diskette.

       Some of the programs are introduced in the class Ground-Water
       Solute-Transport Concepts for Field Investigations (GW2005TC),
       offered annually at the USGS National Training Center.

          U.S. Geological Survey
          Office of Ground Water
          Thomas E. Reilly
          411 National Center
          Reston, VA 20192

          U.S. Geological Survey
          Hydrologic Analysis Software Support Program
          437 National Center
          Reston, VA 20192

       Official versions of U.S. Geological Survey water-resources analysis
       software are available for electronic retrieval via the World Wide
       Web (WWW) at:


       and via anonymous File Transfer Protocol (FTP) from:

         (path: /pub/software).

       The WWW page and anonymous FTP directory from which the ANALGWST
       software can be retrieved are, respectively:


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