Accession Number : ADA305931

Title :   Macroscale Diffusion-Limited Sorption Modeling--A Preliminary Modeling Exercise for a Dover AFB Site.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Herman, Jason T.

PDF Url : ADA305931

Report Date : DEC 1995

Pagination or Media Count : 45

Abstract : A modification was made to the USGS SUTRA code which allowed the simulation of macro scale diffusion effects from specific layers. This modification utilized a split-operator finite element numerical technique to incorporate the macroscale diffusion. The code was applied to a conceptual site developed from a field site at Dover AFB, DL Simulations were done to compare the modified code to the unmodified code which clearly showed the modified code as a closer representation of reality. Simulations were also done to study the effects of pulsed and continuous pumping within the time frame of a field experiment at Dover. These simulations indicated that the diffusion time scale was too long to be studied within the 180 days of the field study. Further investigation over a longer period of time provided the opportunity to study rebound effects due to macroscale diffusion. These simulations confirm the effectiveness of the macroscale model in representing actual physical processes.

Descriptors :   *MATHEMATICAL MODELS, *GROUND WATER, *WATER POLLUTION, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, SPATIAL DISTRIBUTION, WATER FLOW, TIME DEPENDENCE, CHEMICAL CONTAMINATION, PARAMETERS, FINITE ELEMENT ANALYSIS, THESES, ETHYLENE, FINITE DIFFERENCE THEORY, WATER PUMPS, AQUIFERS, AIR FORCE FACILITIES, DIFFUSION, NONEQUILIBRIUM FLOW, INSTALLATION RESTORATION, SORPTION, WATER DISTRIBUTION, NONUNIFORM FLOW, WATER POLLUTION CONTROL EQUIPMENT, HYDRAULIC CONDUCTIVITY.

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE