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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40529

Title: Laboratory Measurement of Solute Transport in Undisturbed Soil Columns Using Time-Domain Reflectometry
Authors: Chiu, Y.
Hsu, S.
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Date: 2012-12
Issue Date: 2017-01-19T07:13:44Z
Publisher: American Geophysical Union, Fall Meeting 2012
Abstract: Abstract: Non-destructive measurement of soil water content and soil bulk electrical conductivity (ECa) using time domain reflectometry (TDR) has been developed for many years. Recent research on detecting solute contaminant in porous media and monitoring solute breakthrough curves using TDR has flourished in the last few years. The soil water content is calculated using the dielectric constant determined by the TDR and the measurement of ECa is estimated from the attenuation of the TDR signal. Besides, it is assumed that there is a linear relationship between ECa and the average pore-water concentration of a particular solute. In this study, the undisturbed soil columns were prepared to study the system response to moisture and solute concentrations in the laboratory. As a demonstration, four experiments with different contaminants, salt, ethanol, mercury, and motor oil, were conducted and their associated reflected signals were examined. Hysteresis was accounted for the dynamics of water distribution, and the obtained breakthrough curves were related to the ECa to the relative concentration of the solute applied to the soil surface. The results indicated that the TDR measurement can simultaneously obtain the soil water content and detect the solute contaminant in porous media. To be able to investigate the effect of hysteresis on solute concentrations, additional experiments for various unsaturated conditions in the soil are needed.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40529
Appears in Collections:[應用地球科學研究所] 演講及研討會

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