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AGU: Water Resources Research

 

Keywords

  • transport
  • memory
  • residence time
  • multirate
  • colloid
  • sorption

Index Terms

  • Hydrology: Groundwater hydrology
  • Hydrology: Groundwater transport
  • Biogeosciences: Biogeochemical cycles, processes, and modeling

Abstract

WATER RESOURCES RESEARCH, VOL. 45, W12419, 9 PP., 2009
doi:10.1029/2009WR008320

Generalization of the multirate basis for time convolution to unequal forward and reverse rates and connection to reactions with memory

Timothy R. Ginn

Department of Civil and Environmental Engineering, University of California, Davis, California, USA

The convolution form used to express mass transfer between mobile and immobile aqueous domains, and often associated with multirate mass transfer representations of matrix diffusion processes, is generalized to the case of unequal forward and reverse rates for each of the multiple rates of the multirate mass transfer and is shown to represent also linear but non-Markovian reactions that kinetically partition mass between mobile and immobile phases with rate of return to mobile phase dependent on contiguous time spent in the immobile phase. In the case where a multirate model refers to multiple sites with distributed mobilization or release rates but single-valued immobilization rate, an equivalent formulation is found using single-site mobilization-immobilization with non-Markovian mobilization rate dependent on contiguous time spent immobilized.

Received 22 June 2009; accepted 8 September 2009; published 25 December 2009.

Citation: Ginn, T. R. (2009), Generalization of the multirate basis for time convolution to unequal forward and reverse rates and connection to reactions with memory, Water Resour. Res., 45, W12419, doi:10.1029/2009WR008320.

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