S & T Road Mapping for Needs From All Sources (Zachara EM-ST, PNNL Scope #30998)
EMSL Project ID
4599
Abstract
Hanford Remediation and Closure Science ProjectThe Hanford Site Groundwater Protection Program, formerly the Groundwater/ Vadose Zone Integration Project, was established in 1997 to develop the integrated approach, technical capability, and scientific information needed to perform site-wide assessments of the potential effects of Hanford Site soil and groundwater contaminants on people and the ecology. To complete this mission, gaps in scientific understanding and technologies were identified, and research to close those gaps was initiated.
The S&T Project is conducting field and laboratory studies and developing and applying numerical models that:
- result in improved conceptual and numerical models of important aspects of contaminant the vadose zone
- include evaluations of water and contaminant movement at representative, contaminated, uncontaminated field sites and targeted investigations to define controlling physical processes, including recharge, lateral spreading, and contaminant attenuation
- provide focused laboratory experiments on waste-sediment interactions and chemical develop improved (multiphase reactive) transport models to forecast the future migration contaminants and to influence remedial actions
- provide opportunities to deploy and test advanced characterization tools and methodologies identify mechanisms and processes that control the depth and extent of contaminant.
Specific capabilities and projects involving EMSL instumentation include:
- Develop experimental data, process-level models, and up-scaling approaches to improve capabilities to model U(VI) transport in heterogeneous vadose zone and groundwater plumes
- Time-resolved laser-induced fluorescence spectroscopy (TRLFS) and imaging spectromicroscopy (TRLFISM) to investigate the chemical speciation of uranyl in contaminated subsurface sediments and natural minerals
- Perform flow & transport laboratory experiments on migration of liquid and dissolved carbon tetrachloride and develop improved, multiphase reactive transport models. Incorporate new knowledge of carbon tetrachloride fluid properties, phase behavior, residual formation, and interaction with calcite-bearing sediments into multiphase reactive transport models to investigate carbon tetrachloride mobility and degradation in Hanford sediments.
- Design, build and demonstrate fully automated saturation-fluid pressure apparatus that can be used to determine constitutive relations of two- and three-phase fluid systems in porous media.
Project Details
Project type
Exploratory Research
Start Date
2003-08-15
End Date
2004-11-11
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members