Observation of Time Dependent Dispersion in Laboratory Scale Experiments with Intact Tuff Article

Rundberg, RS, Triay, IR, Ott, MA et al. (1991). Observation of Time Dependent Dispersion in Laboratory Scale Experiments with Intact Tuff . RADIOCHIMICA ACTA, 52-53(1), 219-228. 10.1524/ract.1991.5253.1.219

cited authors

  • Rundberg, RS; Triay, IR; Ott, MA; Mitchel, AJ

authors

abstract

  • The migration of radionuclides through intact tuff was studied using tuff from Yucca Mountain, Nevada. The tuff samples were both highly zeolitized ash-fall tuff from the Calico Hills and densely welded devitrified tuff from the Topopah Springs member of the Paintbrush tuff. Tritiated water and pertechnetate were used as conservative tracers. The sorbing tracers 85Sr, 13 7Cs, and 13 3Ba were used with the devitrified tuff only. Greater tailing in the elution curves of the densely welded tuff samples was observed than could be fit by adjusting the dispersion coefficient in the conventional Advection Dispersion Equation, ADE. The elution of strontium was found to agree with the measured batch Kd provided the dispersion was adjusted to a significantly larger value than observed for tritiated water. Similar agreement was achieved for cesium and barium using Gelhar's dispersion model for a stratified medium. These results will be discussed in the context of the relationship between the phenomenon of time dependent dispersion and the statistical properties of heterogeneous porous media. © 1991, Walter de Gruyter. All rights reserved.

publication date

  • January 1, 1991

published in

Digital Object Identifier (DOI)

start page

  • 219

end page

  • 228

volume

  • 52-53

issue

  • 1