Release of a new report entitled "A two-constituent solute-transport model for ground water having a variable density"



                UNITED STATES DEPARTMENT OF THE INTERIOR
                           GEOLOGICAL SURVEY
                           RESTON, VA. 22092

In Reply Refer To:                           March 5, 1986
WGS-Mail Stop 411


OFFICE OF GROUND WATER TECHNICAL MEMORANDUM NO. 86.03

Subject:  Publications--Release of a new report entitled "A two-
                        constituent solute-transport model for
                        ground water having a variable density" by
                        Ward E. Sanford and Leonard F. Konikow

The subject report has recently been approved and printed as U.S.
Geological Survey Water-Resources Investigations Report 85-4279.
Copies are being sent under separate cover to all District Offices
and some Subdistricts.

This report documents a numerical model to simulate solute
transport and dispersion of either one or two constituents in
ground water where there is two-dimensional, density-dependent
flow.  The model is a modified version of the one documented in
Techniques of Water Resources Investigations of the U.S.
Geological Survey, Book 7, Chapter 2 by Konikow and Bredehoeft
(1978), which uses finite-difference methods and the method of
characteristics to solve the flow and transport equations.  The
model was tested on an idealized seawater-intrusion problem for
which Henry (1964) developed an analytical solution.  The results
were nearly identical to those of other numerical models tested on
the same problem.  This documentation includes a description of
the formats for the input data, a sample input and output for a
two-constituent example problem, and a listing of the Fortran
Program.

All quantitative hydrologists should be aware of the existence of
this useful tool.  The understanding of solute movement in
variable-density fluids is not always conceptually straightforward
and numerical simulators (such as this one) can be of great help
in understanding a field problem.



                                   (s) Thomas E. Reilly
                                   for Eugene P. Patten
                                   Chief, Office of Ground Water

WRD Distribution:  A, B, S, FO, PO