Lumped mass transfer coefficient for divergent radial solute transport in fractured aquifers

Amin Sharifi Haddad, Hassan Hassanzadeh, Jalal Abedi, Zhangxin Chen

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Dispersion plays an important role in transport of contaminants and tracers in fractured aquifers. In this work we develop a model for the lumped mass transfer coefficient by including dispersion in the fracture network for slab-, cylindrical- and spherical-shapes of the aggregates for the immobile zone. Coupled transport equations of mobile and immobile zones are solved to develop a first-order lumped mass transfer coefficient. An equivalent fracture aperture, uniform rock matrix block size and constant volumetric water contents (mobile and immobile zones) with no adsorption/desorption are used to represent the aquifer. Results reveal that geometry of the rock matrix blocks and dispersivity have important effects on the upscaled mass transfer coefficient. It is found that field scale simulations of transport processes without including the dispersion in fractures are not valid for the whole range of practical injection rates (104 < Pe < 106). However, modeling of laboratory scale experiments (less than one meter in length) without including dispersion in the mobile zone may be valid at high injection rates (Pe > 105). It is confirmed that the upscaled lumped mass transfer coefficient is a function of scale and the rate of injection of the tracer. These findings will find applications in modeling of transport processes of contaminated sites remediation and waste disposal.
Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalJournal of Hydrology
Volume495
Early online date14 May 2013
DOIs
Publication statusPublished - 12 Jul 2013

Fingerprint

solute transport
mass transfer
aquifer
transport process
tracer
fracture aperture
matrix
dispersivity
fracture network
waste disposal
rock
slab
desorption
remediation
water content
adsorption
geometry
pollutant
modeling
simulation

Keywords

  • mass transfer coefficient
  • Ground water
  • Fractured rock
  • Modified Sherwood number
  • Dispersivity

Cite this

Lumped mass transfer coefficient for divergent radial solute transport in fractured aquifers. / Sharifi Haddad, Amin; Hassanzadeh, Hassan; Abedi, Jalal; Chen, Zhangxin.

In: Journal of Hydrology, Vol. 495, 12.07.2013, p. 113-120.

Research output: Contribution to journalArticle

Sharifi Haddad, Amin ; Hassanzadeh, Hassan ; Abedi, Jalal ; Chen, Zhangxin. / Lumped mass transfer coefficient for divergent radial solute transport in fractured aquifers. In: Journal of Hydrology. 2013 ; Vol. 495. pp. 113-120.
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N1 - Acknowledgments Financial support of NSERC/AIEES (AERI)/Foundation CMG and AITF (iCORE) Chairs is greatly acknowledged. The authors also would like to thank Peter K. Kitanidis Editor-in-Chief, Associate Editor and two reviewers for their useful comments.

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N2 - Dispersion plays an important role in transport of contaminants and tracers in fractured aquifers. In this work we develop a model for the lumped mass transfer coefficient by including dispersion in the fracture network for slab-, cylindrical- and spherical-shapes of the aggregates for the immobile zone. Coupled transport equations of mobile and immobile zones are solved to develop a first-order lumped mass transfer coefficient. An equivalent fracture aperture, uniform rock matrix block size and constant volumetric water contents (mobile and immobile zones) with no adsorption/desorption are used to represent the aquifer. Results reveal that geometry of the rock matrix blocks and dispersivity have important effects on the upscaled mass transfer coefficient. It is found that field scale simulations of transport processes without including the dispersion in fractures are not valid for the whole range of practical injection rates (104 < Pe < 106). However, modeling of laboratory scale experiments (less than one meter in length) without including dispersion in the mobile zone may be valid at high injection rates (Pe > 105). It is confirmed that the upscaled lumped mass transfer coefficient is a function of scale and the rate of injection of the tracer. These findings will find applications in modeling of transport processes of contaminated sites remediation and waste disposal.

AB - Dispersion plays an important role in transport of contaminants and tracers in fractured aquifers. In this work we develop a model for the lumped mass transfer coefficient by including dispersion in the fracture network for slab-, cylindrical- and spherical-shapes of the aggregates for the immobile zone. Coupled transport equations of mobile and immobile zones are solved to develop a first-order lumped mass transfer coefficient. An equivalent fracture aperture, uniform rock matrix block size and constant volumetric water contents (mobile and immobile zones) with no adsorption/desorption are used to represent the aquifer. Results reveal that geometry of the rock matrix blocks and dispersivity have important effects on the upscaled mass transfer coefficient. It is found that field scale simulations of transport processes without including the dispersion in fractures are not valid for the whole range of practical injection rates (104 < Pe < 106). However, modeling of laboratory scale experiments (less than one meter in length) without including dispersion in the mobile zone may be valid at high injection rates (Pe > 105). It is confirmed that the upscaled lumped mass transfer coefficient is a function of scale and the rate of injection of the tracer. These findings will find applications in modeling of transport processes of contaminated sites remediation and waste disposal.

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