Movement of Chloride in Clayey Soil
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概要
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The dispersion of solute such as chloride flowing through a clayey soil is a complicated process involving subtle interactions between advection and molcular diffusion. In this work, sandy clay and sand were used for tracer experiments and the characteristics of chloride flowing through the two soils were compared. Breakthrough curves were used to compare the characteristics and the change of chlorinity in soil water with pF value over 4.2 was measured to indirectly affirm the influence of soil adsorption on the movement of chloride. Main results are as follows:<BR>When chloride flows through the clayey soil, instead of piston flow, a large dispersion indicator appears. Chloride moves faster than water molecular. As the result of it, total water effluent in sand sample reduces to less than pore volume and in clayey soil samples less than the sum of pore volume and amount corresponding to the ions adsorbed. A modifided equation from Thomas was used to find Vc, the relative flow rate of chloride with respect to water molcular in experiments and it was found that Vc is 1.08 and 1.17 in clayey soil and sand soil, respectively. Because of the soil absorption, in soil water with pF value over 4.2, chlorinity is higher than the solution used as tracer in experiments, and this decrease of solute from solution is equivalent to adding solvent to the solution. So it was found that apparently the relative water outflow is over 1.
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