Electrical capacitance volume tomography for measurement soil water infiltration in vessel experiments
来源期刊：中南大学学报(英文版)2014年第1期
论文作者：Muhammad Mukhlisin Marlin Ramadhan Baidillah Mohd Raihan Taha
文章页码：358 - 364
Key words：soil water infiltration; electrical capacitance volume tomography; real time imaging
Abstract: Electrical capacitance volume tomography (ECVT) is a recently-developed technique for real-time, non-invasive 3D monitoring of processes involving materials with strong contrasts in dielectric permittivity. This work is first application of the method to visualization of water flow in soil. We describe the principles behind the method, and then demonstrate its use with a simple laboratory infiltration experiment. 32 ECVT sensors were installed on the sides of an empty PVC column. Water was poured into the column at a constant rate, and ECVT data were collected every second. The column was then packed with dry sand and again supplied with water at a constant rate with data collected every second. Data were analyzed to give bulk average water contents, which proved consistent with the water supply rates. Data were also analyzed to give 3D images (216 voxels) allowing visualization of the water distribution during the experiments. Result of this work shows that water infiltration into the soil, wall flow, progress of the unstable wetting front and the final water distribution are clearly visible.
Muhammad Mukhlisin1, 2, Marlin Ramadhan Baidillah1, Mohd Raihan Taha1
(1. Department of Civil and Structural Engineering, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia;
2. Department of Civil Engineering, Polytechnic Negeri Semarang, Jl. Sudarto SH,
Tembalang 50275, Semarang, Indonesia)
Abstract:Electrical capacitance volume tomography (ECVT) is a recently-developed technique for real-time, non-invasive 3D monitoring of processes involving materials with strong contrasts in dielectric permittivity. This work is first application of the method to visualization of water flow in soil. We describe the principles behind the method, and then demonstrate its use with a simple laboratory infiltration experiment. 32 ECVT sensors were installed on the sides of an empty PVC column. Water was poured into the column at a constant rate, and ECVT data were collected every second. The column was then packed with dry sand and again supplied with water at a constant rate with data collected every second. Data were analyzed to give bulk average water contents, which proved consistent with the water supply rates. Data were also analyzed to give 3D images (216 voxels) allowing visualization of the water distribution during the experiments. Result of this work shows that water infiltration into the soil, wall flow, progress of the unstable wetting front and the final water distribution are clearly visible.
Key words:soil water infiltration; electrical capacitance volume tomography; real time imaging
