ESTS0599 DPCT.

1. NAME OR DESIGNATION OF PROGRAM:  DPCT.

3. DESCRIPTION OF PROGRAM OR FUNCTION

DPCT is designed to simulate mass transfer by ground water movement in a vertical section of the  earth's mass. The model can account for convection, dispersion, radioactive decay, and cation exchange for a single component.

4. METHOD OF SOLUTION

The hybrid deterministic-probabilistic model is used. The hybrid method addresses the fundamental problem of describing the spread of a large number of moving reference particles within a region. It is impossible to represent individual  particle motion in exact mathematics. Statistical features provide a basis for representing an idealized pattern of motion. Because the individual particle position is known, one can easily determine the  distribution of contaminant mass. This distribution can be expressed in terms of concentrations. The actual pattern of ground water flow  is described by the ground water velocity field. A velocity is calculated for each reference particle in the region by interpolating values from the two-dimensional grid of velocities. Dispersions are accounted for in the particle motion by adding a random component to the deterministic motion. By summing the mass carried by each particle in a given cell and by determining the volume of water in the cell, it is possible to calculate contaminant concentrations within the region. When only convective and dispersive processes act, the quantity of mass is constant; however, when there is radioactive decay or cation exchange, the quantity of  mass is decreased. The solution of the ground water flow equation and the dispersion-convection equation is subject to boundary conditions.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The model is sufficiently general to enable the user to specify virtually any type of water table or geologic configuration, and a variety of boundary conditions.

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- F.W. Schwartz and A. Crowe:
  A Deterministic-Probabilistic Model for Contaminant Transport
  User Manual,
  NUREG/CR-1609 (August 1980)
  CGS/NR85U060
  GF

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  UNICOS.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

   F.W. Schwartz and A. Crowe
   Oak Ridge National Lab. TN (United States)

source program   mag tapeDPCT.F Source file                         SRCTP
source program   mag tapeDPCT.FOR Source file                       SRCTP
test-case data   mag tapeINP Sample Problem Input File              DATTP
test-case output mag tapeOUT Sample Problem Output File             OUTTP
user's guide             NUREG/CR-1609 (August 1980)                WRKPT