1. bookVolume 69 (2021): Issue 2 (June 2021)
Journal Details
First Published
28 Mar 2009
Publication timeframe
4 times per year
access type Open Access

Effect of soil textural characteristics on longitudinal dispersion in saturated porous media

Published Online: 21 May 2021
Page range: 161 - 170
Received: 16 Dec 2019
Accepted: 04 Jan 2021
Journal Details
First Published
28 Mar 2009
Publication timeframe
4 times per year

This study focuses on the effects of soil textural heterogeneity on longitudinal dispersion under saturation conditions. A series of solute transport experiments were carried out using saturated soil columns packed with two filter sands and two mixtures of these sands, having d50 values of 95, 324, 402, and 480 µm, subjected to four different steady flow rates. Values of the dispersion coefficient (D) were estimated from observed in-situ distributions of calcium chlo-ride, injected as a short nonreactive tracer pulse, at four different locations (11, 18, 25, 36 cm). Analyses of the observed distributions in terms of the standard advection-dispersion equation (ADE) showed that D increased nonlinearly with travel distance and higher Peclet numbers+. The dispersion coefficient of sand sample S1 with its largest average particle size (d50) was more affected by the average pore-water velocity than sample S4 having the smallest d50. Results revealed that for a constant velocity, D values of sample S1 were much higher than those of sample S4, which had the smallest d50. A correlation matrix of parameters controlling the dispersion coefficient showed a relatively strong positive relationship between D and the Peclet number. In contrast, almost no correlation was evident between D and porosity as well as grain size. The results obtained with the four sandy matrices were consistent and proved that the dispersion coefficient depends mainly on the particle size.


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