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Advances in analytical solutions for time-dependent solute transport model

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Abstract

This study adopts generalized dispersion theory in one-dimensional advection–dispersion equation (ADE), where time-dependent dispersion and velocity are considered. The generalized dispersion theory allows mechanical dispersion to be directly proportional to seepage velocity with power n, where n is any real number. Homotopy analysis method (HAM) that uses a simple algorithm is adopted to handle the non-linearity that occurred in the ADE under the generalized dispersion. A point source is introduced to the entry boundary and a line source is introduced to the entire model domain. Three time-dependent point sources in the form of (i) exponentially decreasing function, (ii) linear function and (iii) sinusoidal function, at the entry boundary are considered. Two-line sources are considered in the form of (i) linear space-dependent function and (ii) nonlinear space-time-dependent function. Using the HAM, semi-analytical solutions for any power n are derived and semi-analytical solutions for n = 1 and n = 1.5 are discussed in particular. Comparison with the analytical solution is discussed and found good agreement for 6th order of solution obtained by HAM.

Research Highlights

  1. 1.

    Generalized dispersion theory in 1-D ADE

  2. 2.

    Generalized semi-analytical solution using HAM

  3. 3.

    Compared with analytical solution

  4. 4.

    Good agreement for 6th order of semi-analytical solution

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Acknowledgements

The authors are thankful to the Indian Institute of Technology (Indian School of Mines), Dhanbad, India, for providing financial support for PhD studies under the UGC-JRF scheme. This work is partially supported by the DST (SERB) Project EMR/2016/001628.

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Authors

Contributions

Rohit Kumar: Conceptualization, methodology, writing – original draft preparation, investigation, validation. Ayan Chatterjee: Formal analysis. Mritunjay Kumar Singh: Supervision, writing – reviewing and editing. Frank T-C Tsai: Reviewing and editing.

Corresponding author

Correspondence to Mritunjay Kumar Singh.

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Communicated by Saibal Gupta

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Kumar, R., Chatterjee, A., Singh, M.K. et al. Advances in analytical solutions for time-dependent solute transport model. J Earth Syst Sci 131, 131 (2022). https://doi.org/10.1007/s12040-022-01858-5

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