1. NAME AND TITLE
SPOOR: Monte Carlo Simulation of the Turbulent Transport of Airborne Contaminants.
Los Alamos National Laboratory, Los Alamos, New Mexico.
3. CODING LANGUAGE AND COMPUTER
FORTRAN IV; CDC 7600.
4. NATURE OF PROBLEM SOLVED
SPOOR solves the problem of atmospheric turbulent diffusion of a contaminant cloud in three
dimensions with arbitrarily specified source configuration, turbulent-energy spectrum, and time-and-space-varying mean transport wind field.
5. METHOD OF SOLUTION
A Monte Carlo random-walk approach is used in which the contaminant cloud is represented as
an ensemble of particles. The trajectory of each particle is simulated through a series of small time
steps by taking into account the local mean wind, time-correlated velocity fluctuations, and random
components to account for small-scale effects.
6. RESTRICTIONS OR LIMITATIONS
For SPOOR, the small-core memory is 49,000 and the large-core memory is 37,000. For the
I/O Buffering Operations, the small-core memory is zero and the large-core memory is 350,000.
There are no known restrictions on argument range.
7. TYPICAL RUNNING TIME
Running time (T) in seconds on the CDC 7600:
T = 22 + 0.0004 (N x M),
where N = number of time steps,
M = number of histories.
8. COMPUTER HARDWARE REQUIREMENTS
SPOOR was designed to run on a CDC 7600 computer.
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN IV compiler is required.
C. W. Watson and S. Barr, "Monte Carlo Simulation of the Turbulent Transport of Airborne
Contaminants," LA-6103 (January 1976).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input. A listing of the sample problem output is printed in the documentation.
12. DATE OF ABSTRACT
May 1976; revised March 1982, January 1983; reviewed February 1985.
KEYWORDS: MONTE CARLO; AIRBORNE; NUCLIDE TRANSPORT; ENVIRONMENTAL DOSE