Geoelectrical Characterization of Mobile/Immobile Exchange: New Technologies for Field Testing and Data Analysis

reportActive / Technical Report | Accesssion Number: AD1202940 | Open PDF

Abstract:

The classical advective-dispersive transport model inadequately describes the migration of contaminants or other chemicals in groundwater in many geologic settings, particularly in heterogeneous aquifers and fractured rock. Alternative models, including the mobile/immobile model, are necessary to explain contaminant rebound at the end of pump-and-treat operations, extremely slow rates of contaminant removal, and other phenomena attributed to back diffusion. In the mobile/immobile model, the geologic medium comprises dual overlapping domains (Figure 1), one in which water and chemicals move through advection and dispersion (the mobile domain), and the other in which water is stagnant and chemicals are stored and slowly released (the immobile domain). Contamination trapped in the immobile domain acts as a long-term source, as it slowly diffuses back into the mobile domain where it is measured or observed in groundwater samples. The mobile/immobile model is widely used and supported in popular computer codes for contaminant transport including the U.S. Geological Surveys MODFLOW 6 (Langevin et al., 2017) and the MT3D family of codes.

Author(s):
Terry, Neil ; Slater, Lee ; Iery, Ramona ; Hammett, Steven
Author Organization(s):
NAVAL FACILITIES ENGINEERING COMMAND PORT HUENEME CA; GEOLOGICAL SURVEY WASHINGTON DC; RUTGERS - THE STATE UNIV NEWARK NJ
Funding Organization(s):
ENVIRONMENTAL SECURITY TECHNOLOGY CERTIFICATION PROGRAM ALEXANDRIA VA, ALEXANDRIA , VA
Document Type:
Technical Report/Other
Publication Date:
2021 Dec 27
Pagination:
5

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release

RECORD

Collection: TRECMS
Identifying Numbers
Project Number(s):
ER-201732
Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
data analysis, water resources, groundwater, three dimensional, computers, department of defense, diffusion, measurement, transport ships, contamination, fluids, mass transfer, monitoring, security, surveys, water, advection
Keyword(s):
Geoelectrical Characterization, Mobile Immobile Exchange, mi-pet (Mobile Immobile Porosity Exchange Tool), hydraulic isolation, fluid injection, fluid sampling, fluid conductivity, davt (Data Analysis and Visualization Tool)
Subject Categories:
Environmental Pollution and Control; Test Equipment, Research Facilities and Reprography; Mathematical and Computer Sciences
Creation Date:
2023 Jun 06
Update Date:
2023 Sep 06