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Title: Reactive transport in the complex heterogeneous alluvial aquifer of Fortymile Wash, Nevada

Yucca Mountain, Nevada, had been extensively investigated as a potential deep geologic repository for storing high-level nuclear wastes. Previous field investigations of stratified alluvial aquifer downstream of the site revealed that there is a hierarchy of sedimentary facies types. There is a corresponding log conductivity and reactive surface area subpopulations within each facies at each scale of sedimentary architecture. Here in this paper, we use a Lagrangian-based transport model in order to analyze radionuclide dispersion in the saturated alluvium of Fortymile Wash, Nevada. First, we validate the Lagrangian model using high-resolution flow and reactive transport simulations. Then, we used the validated model to investigate how each scale of sedimentary architecture may affect long-term radionuclide transport at Yucca Mountain. Results show that the reactive solute dispersion developed by the Lagrangian model matches the ensemble average of numerical simulations well. The link between the alluvium spatial variability and reactive solute dispersion at different spatiotemporal scales is demonstrated using the Lagrangian model. Finally, the longitudinal dispersivity of the reactive plume can be on the order of hundreds to thousands of meters, and it may not reach its asymptotic value even after 10,000 years of travel time and 2–3 km of travel distance.
 [1] ;  [2] ;  [3]
  1. The Ohio State Univ., Columbus, OH (United States). School of Earth Sciences
  2. Univ. of Texas, Austin, TX (United States). Jackson School of Geosciences, Bureau of Economic Geology
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Jilin Univ., Changchun (China). College of Construction Engineering
Publication Date:
Report Number(s):
Journal ID: ISSN 0045-6535
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Additional Journal Information:
Journal Volume: 179; Journal Issue: C; Journal ID: ISSN 0045-6535
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; Reactive transport; Hierarchical porous media; Alluvial aquifer; Fortymile Wash Nevada; Lagrangian theory; Numerical simulation
OSTI Identifier: