1. NAME AND TITLE
COLUMN2: Calculation of Effects of Physicochemical Processes on Migration.
Riso National Laboratory, Roskilde, Denmark, through the NEA Data Bank, Gif-sur-Yvette,
3. CODING LANGUAGE AND COMPUTER
Fortran 77; IBM 3090 and VAX 11/780 (C00534ALLMF00)
4. NATURE OF PROBLEM SOLVED
COLUMN2 is designed for studies of the effects of various physicochemical processes on
radionuclide migration in one dimension. It solves the solute transport equation and can take into
account dispersion, sorption, ion exchange, first and second order homogeneous chemical reactions.
Spacial variations of input pulses and retention factors are possible.
5. METHOD OF SOLUTION
The solution is based on a finite difference method followed by the application of the method of
characteristics on two separate grid systems.
6. RESTRICTIONS OR LIMITATIONS
For computational reasons the number of components has been limited to 5 and the maximum
number of second order reactions is 10. However, a redimensioning of all relevant arrays will allow
for any number of components and reactions. The maximum number of grid points, default value 801,
may be enlarged to redimension all relevant arrays.
7. TYPICAL RUNNING TIME
Test cases 3A through 3E have a typical CPU-time of 1 minute. NEA-DB ran the test cases
included in this package on the IBM 3090 and the VAX 11/780 computers. Execution times varied
between 11 seconds and 6 minutes on the VAX; the variation was between 1 second and 2.5 minutes
on the IBM.
8. COMPUTER HARDWARE REQUIREMENTS
An IBM 3090 or a VAX 11/780 computer is required. Main storage requirements for running the
test cases are: 400 K bytes (IBM 3090).
9. COMPUTER SOFTWARE REQUIREMENTS
A Fortran 77 compiler is required. The operating system for testing on the IBM 3090 was MVS-XA and on the VAX was VMS 4.6. The Risoe Interactive Graphics System (RIGS) was used for
O. J. Nielsen, P. Bo, and L. Carlsen, "COLUMN2--A Computer Program for Simulating Migration," RISO-R-514 (October 1985).
S. Rahbek, S. Frederiksen, and E. Hansen, "RISO Interactive Graphics System," RISO-M-2605
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
codes, an information file, interface routines (VAX only), JCL, and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: ENVIRONMENTAL DOSE; FINITE ELEMENT METHOD; LIQUID PATHWAY; NUCLIDE TRANSPORT; RADIONUCLIDES; RISK ASSESSMENT