pbcgen(1)        U.S. Geological Survey (wrdapp)        pbcgen(1)


NAME
       pbcgen - SUTRA utility program to generate hydrostatic
                pressure distribution

ABSTRACT
       PBCGEN is an auxiliary program to generate the hydrostatic pressure
       distribution based on a column of water with concentrations
       specified as a function of depth.  The pressures computed may be
       directly used as input in the SUTRA unit-K1 data file for the
       pressure data along a vertical (or oblique) boundary of a cross-
       sectional mesh.

DATA REQUIREMENTS
       PBCGEN prompts for the following values and then reads, free-format,
       from the standard input unit (normally the keyboard) values of
       concentration of seawater as a fraction of pure seawater of each
       node progressing downwards along a hydrostatic boundary:

             NNCOL  = Number of nodes in column
             N(1)   = Node number at top of column
             COLCON = Maximum saltwater chloride concentration
             P(1)   = Abient pressure at top of column
             INCNOD = Increment in node number going down column
             RHO0   = Water density at zero concentration chloride
             DRDC   = Coefficient of density change
             DELZ   = Vertical distance between nodes in column
             GRAVZ  = Absolute value of gravitation acceleration

       By free-format it is meant that values may be input in any columns
       as long as they are input in order (down the column), they are valid
       floating point values, all NNCOL values are input, and a blank(s), a
       comma, or a carriage return separates each value.

OUTPUT OPTIONS
       PBCGEN creates the file PBCOUT.DAT in the user's current directory.

DOCUMENTATION
       This program is provided without documentation.

CONTACTS
       Operation:
          U.S. Geological Survey
          Office of Hydrologic Research
          Clifford I. Voss
          431 National Center
          Reston, VA  20192

          cvoss@usgs.gov

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



                            7 Jul 1998                          1





pbcgen(1)        U.S. Geological Survey (wrdapp)        pbcgen(1)


          h2osoft@usgs.gov

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

                  http://water.usgs.gov/software/

       and via anonymous File Transfer Protocol (FTP) from:

                  water.usgs.gov (path: /pub/software).

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

                  http://water.usgs.gov/software/sutra.html
                                --and--
                  /pub/software/ground_water/sutra

       If you would like to obtain the price of and (or) order paper copies
       of USGS reports, contact the USGS Branch of Information Services at:

                  U.S. Geological Survey
                  Branch of Information Services
                  Denver Federal Center, Box 25286
                  Denver CO 80225-0286

       To inquire about Open-File Reports or Water-Resources Investigations
       Reports:
                  Tel: 303-202-4210; Fax 303-202-4695

       To inquire about other USGS reports:
                  Tel: 303-202-4700; Fax 303-202-4693

SEE ALSO
       mgenrad(1) - SUTRA utility program to generate a simple mesh
       mgenrec(1) - SUTRA utility program to generate a simple mesh
       sutra(1) - Saturated and (or) unsaturated, constant or
                  variable-density fluid flow, and solute or energy
                  transport (2-dimensional finite-element code)
       sutraplt(1) - Graphics postprocessor program for SUTRA
















                            7 Jul 1998                          2