- Program Areas
- Energy and Water
- Environmental Restoration
- Munitions Response
- Resource Conservation and Climate Change
- Weapons Systems and Platforms
Decision Support System for Matrix Diffusion Modeling
The objective of this project is to equip the groundwater community with accessible, easy-to-use, and useful models to evaluate matrix diffusion effects. Results of Air Force Center for Engineering and the Environment (AFCEE) and Strategic Environmental Research and Development Program (SERDP) research projects will be developed into analytical matrix diffusion models. These models will be used to create a decision support system that will enable users to enter site-specific parameters that can be used to predict matrix diffusion effects. The specific objectives are to (1) develop a decision support system equipped with planning level Mass Discharge Module and Concentration Module models; (2) create an interactive help guide and users manual; (3) test the decision support system using data from Environmental Security Technology Certification Program (ESTCP) and SERDP projects; and (4) finalize the decision support system and make it available as a free, easily downloadable software package.
The decision support system will consist of two modules. In the Mass Discharge Module, four separate models will provide users with planning level estimates of the mass discharge (in units of grams per day) caused by back diffusion from a low permeability diffusion-dominated unit (typically silt or clay) into a high permeability advection-dominated unit (typically sand or gravel). The Concentration Module will provide more detailed "two-layer" analytical matrix diffusion models and provide insights regarding complex heterogeneous settings. This module can be used as more of a conceptual model for multiple layer systems. Specifically, the Concentration Module model will provide a stylistic understanding of the matrix diffusion problem.
A comprehensive dynamic decision support tool can provide site stakeholders the information needed to characterize, understand, design, and predict the relevance and appropriateness of remediating sites affected by matrix diffusion. The Matrix Diffusion Decision Support System will provide a valuable tool for supporting site characterization efforts and determining if matrix diffusion will affect remediation goals for Department of Defense (DoD) sites. The decision support system will provide an improved understanding of matrix diffusion and help DoD site stakeholders determine if matrix diffusion processes are significant enough to cause "rebounding" groundwater concentrations of downgradient plume concentrations above remediation goals after plume remediation or isolation is complete. The decision support system will have the immediate benefit of summarizing existing matrix diffusion information and experience into one source. Having this information readily available before a remedy is implemented could assist DoD site stakeholders select more appropriate remedies and improve effective risk communication with regulators and the public. Furthermore, the software will assist project managers in determining if remediation goals are achievable in the short term. Cost savings can be realized by addressing extended remediation time frames caused by matrix diffusion. (Anticipated Project Completion - 2012)
Points of Contact
Dr. Charles Newell
GSI Environmental Inc.
SERDP and ESTCP
- Fact Sheet - Brief project summary with links to related documents and points of contact.
- Final Report - Comprehensive report for every completed SERDP and ESTCP project that contains all technical results.
- Cost & Performance Report - Overview of ESTCP demonstration activities, results, and conclusions, standardized to facilitate implementation decisions.
- Technical Report - Additional interim reports, laboratory reports, demonstration reports, and technology survey reports.
- Guidance - Instructional information on technical topics such as protocols and user’s guides.
- Workshop Report - Summary of workshop discussion and findings.
- Multimedia - On demand videos, animations, and webcasts highlighting featured initiatives or technologies.
- Model/Software - Computer programs and applications available for download.
- Database - Digitally organized collection of data available to search and access.