see our Publications & Reports

Technical Details  

• Scalable design for execution on laptops and supercomputers 
• Laboratory and field installations
• Coupling with flow and transport models (e.g., PFLOTRAN, eSTOMP)
  1. Cost efficiency associated with pre-field planning
  2. Physically-based field-scale feasibility assessments
• Solutions for:
  1. Mesh generation (problem definition/boundaries)
  2. Forward modeling (feasibility and synthetic studies)
  3. Inverse modeling (static characterization)
  4. Time-lapse inverse modeling (monitoring)

What makes E4D unique?

• NQA-1 qualified
• Computational efficiency
• Customization
• Incorporation of prior information
  1. Perched-water and/or water table locations
  2. Metallic infrastructure locations
  3. Hydrostratigraphic boundaries
  4. Conductivity parameter bounds

How does E4D execute?

Reading user-created ascii text files customized for an operational run mode and site-specific description, E4D executes with a master-slave configuration, where the master process communicates with slave processes for parallel execution. This distributes the computational burden to slave nodes, allowing for near real-time interpretation of large geophysical datasets.

Field examples include:

• Characterization of hazardous nuclear wastes beneath underground tanks. The largest static ERT inversion to date with ~5,000 electrodes, 220,000 measurements, and 3 million inversion parameters.
• River-stage intrusion and paleochannel detection. Surveys were executed with 352 surface electrodes, collecting 139,000 measurements every 6 hours.  A time-lapse inversion of  ~905,000 inversion parameters executed within 2 hours on 353 cores.
• Tank leak detection. With 4 lines of 16 buried electrodes surrounding a tank, 5000 time-lapse measurements were inverted with ~950,000 parameters within 3 hours using 65 cores.