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Estimation of contaminant transport parameters for a tropical sand in a sand tank model
Article 18: Volume 7, Number 2, Spring 2010, Pages 385-394 (10) XML PDF (1293 K)
Authors
O. Ojuri; S. A. Ola
Abstract
This research describes the goals, design and implementation of a quasi natural gradient, laboratory scale, sand tank (aquifer) model experiment. The model was used to study the transport of an inorganic tracer (Chloride) in groundwater, within a tropical aquifer (porous medium) material. Three-dimensional sand tank (1.8 m × 0.3 m × 0.8 m) experiments were conducted to investigate contaminant transport and natural attenuation within the sand tank. In all, 360 samples were collected during 24 sampling sessions, for the three days of the tracer experiments in the Sand Tank. The Owena sand is a poorly graded sand with 88.1 % sand and 11.9 % gravel. Geotechnical properties including; coefficient of uniformity Cu = 2.53, coefficient of gradation Cz = 0.181, hydraulic conductivity K = 5.76 x 10-4 m/s, bulk density ñ = 1.9 Mg/m3, effective porosity ne = 0.215 and median grain diameter D50 = 0.55 mm, were determined. Other relevant hydraulic and solute transport parameters, such as dispersion coefficients and dispersivities were also established for the tropical soil.
Keywords
Aquifer model; Geotechnical properties; Owena sand; Solute transport parameters; Tracer breakthrough
Main Subjects
Aquifer model; Sand tank model; Transport; Tropical
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