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
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1.
Generalized dispersion theory in 1-D ADE
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2.
Generalized semi-analytical solution using HAM
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3.
Compared with analytical solution
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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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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.
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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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DOI: https://doi.org/10.1007/s12040-022-01858-5