Analysis of Tracer Tests with Multirate Diffusion Models: Recent Results and Future Directions within the WIPP Project Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title Analysis of Tracer Tests with Multirate Diffusion Models: Recent Results and Future Directions within the WIPP Project


  • Author: ALTMAN, SUSAN J.
    Creator Type: Personal
  • Author: HAGGERTY, ROY
    Creator Type: Personal
  • Author: MCKENNA, SEAN A.
    Creator Type: Personal
  • Author: MEIGS, LUCY C.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)


  • Name: Sandia National Laboratories
    Place of Publication: Albuquerque, New Mexico
    Additional Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA


  • Creation: 1999-10-01


  • English


  • Content Description: A series of single-well injection-withdrawal (SWIW) and two-well convergent-flow (TWCF) tracer tests were conducted in the Culebra dolomite at the WIPP site in late 1995 and early 1996. Modeling analyses over the past year have focused on reproducing the observed mass-recovery curves and understanding the basic physical processes controlling tracer transport in SWIW and TWCF tests. To date, specific modeling efforts have focused on five SWIW tests and one TWCF pathway at each of two different locations (H-11 and H-19 hydropads). An inverse parameter-estimation procedure was implemented to model the SWIW and TWCF tests with both traditional and multirate double-porosity formulations. The traditional model assumes a single diffusion rate while the multirate model uses a first-order approximation to model a continuous distribution of diffusion coefficients. Conceptually, the multirate model represents variable matrix block sizes within the Culebra as observed in geologic investigations and also variability in diffusion rates within the matrix blocks as observed with X-ray imaging in the laboratory. Single-rate double-porosity models cannot provide an adequate match to the SWIW data. Multirate double-porosity models provide excellent fits to all five SWIW mass-recovery curves. Models of the TWCF tests show that, at one location, the tracer test can be modeled with both single-rate and multirate double-porosity models. At the other location, only the multi-rate double-porosity model is capable of explaining the test results.
  • Physical Description: 10 p.


  • Keyword: Radioactive Waste Disposal
  • Keyword: Diffusion
  • STI Subject Categories: 12 Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities
  • Keyword: Wipp
  • Keyword: Tracer Techniques
  • Keyword: Dolomite
  • Keyword: Flow Models
  • Keyword: Environmental Transport
  • Keyword: Radionuclide Migration


  • Conference: 3rd Aspo International Seminar on Characterization and Evaluation of Sites for Deep Geological Disposal of Radioactive Wastes in Fractured Rocks, Oskarshamn (SE), 06/10/1998--06/12/1998


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article


  • Text


  • Report No.: SAND98-0810C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 12717
  • Archival Resource Key: ark:/67531/metadc622443


  • Display Note: INIS; OSTI as DE00012717
  • Display Note: Medium: P; Size: 10 pages