Quantification of pore-size spectrums by solute breakthrough curves

  • Erşahin S
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Abstract

Abstract. Breakthrough of conservative tracers may be used to quantify pore-size spectrum and pore-water velocity distributions in a porous medium. In this study, a theory was proposed to calculate pore-water velocity and corresponding pore-size spectrum in porous media, and its application was demonstrated. Miscible displacement tests of chloride were conducted with sand columns (5 cm id and 5 cm length), repacked with washed sand with a particle size of 2–1, 1–0.45, 0.45–0.325 and <0.325 mm in diameter. The resulting breakthrough curves were divided into approximately 20 segments, and for each segment, a concentration of Cl in an out-flowing effluent was used with corresponding effluent volume and travel time to calculate corresponding pore water velocity (v) and pore-radius. Mean v (vb) calculated for a column was approximated by geometric averaging the calculated v-values for the BTC. To validate the developed model, laboratory measured and approximated values of vb were compared. The correlation analysis conducted between measured and approximated vb resulted in a correlation coefficient of r = 0.89 (P

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APA

Erşahin, S. (2011). Quantification of pore-size spectrums by solute breakthrough curves. Hydrology and Earth System Sciences Discussions, 8(5), 8373–8397. Retrieved from www.hydrol-earth-syst-sci-discuss.net/8/8373/2011/

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