Solute movement in an intact soil core under different ponding heights |
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| Authors: | F Tonguç H Merdun |
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| Institution: | (1) Department of Soil Science, College of Agriculture, Bu-Ali University, Hamadan, Iran;(2) Department of Soil Science, The University of Reading, Whiteknights, Reading, RG6 6DW, UK |
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| Abstract: | Contaminant transport to groundwater systems through the unsaturated zone follows, in most cases, preferential pathways. The
understanding and assessment of this preferential flow mechanism is important to the prevention and solution of resulting
problems. A column study was carried out where a NaCl-tracer solution (33 to 37 mmohs/cm of conductivity) was passed through
an intact soil core under saturated conditions and three different ponding heights ranging from 5 to 30 mm. Outflow rates
varied from 13 to 103 ml/min during the three tests performed. A subsequent dye tracing and slicing of the soil column was
performed. Electrical conductivity measurements assessed indirectly the chloride content of the water outflow. Breakthrough
curves (BTCs) showed short threshold times (less than 20% pore volume time) and asymmetry with respect to the point defined
by C/Co = 0.5 and pore volume time. The BTCs successfully represent the flow measurements through the soil column, this fact
is supported by the subsequent horizontal slicing (5 cm thick) of the intact core. |
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