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|Title: ||Comparison of invasive and non-invasive electromagnetic methods in soil water content estimation of a dike model|
|Authors: ||Preko, Kwasi|
|Keywords: ||Water content measurement|
Time domain reflectometry
|Issue Date: ||2009|
|Publisher: ||Journal of Geophysics and Engineering|
|Citation: ||Journal of Geophysics and Engineering, 6 (2009) 146–161. doi:10.1088/1742-2132/6/2/006|
|Abstract: ||Water infiltration through a dike model under controlled flooding and drainage conditions was
investigated using the gravimetric soil water sampling technique and electromagnetic
techniques, in particular ground penetrating radar (GPR) applied in different forms, time
domain reflectometry with intelligent microelements (TRIME-TDR) and spatial-time domain
reflectometry (S-TDR). The experiments were conducted on the model in two phases. In the
first phase, the model was flooded with varying water levels between 0 and 1.25 m above the
waterproof base of the model. In the second phase, the characteristics of the temporal water
content changes were investigated over a period of 65 days as the flood water drained off from
the 1.25 m level. The dike model was constructed with soil of the texture class loamy sand.
The aim of the experiment was to investigate whether GPR-based invasive and non-invasive
methods were able to quantitatively observe and correctly monitor temporal changes in the
volumetric water content (VWC) within embankment dams. The VWC values from the
various techniques corresponded very well, especially with low VWC values. A comparison
with the VWC of gravimetric soil water sampling showed a satisfactory reproducibility.
Characteristic discrepancies were recorded with higher values of the VWC. Under saturated
conditions only the invasive methods were able to produce reasonable values of the VWC.
After the release of the highest flood level, the drainage phase could be characterized by two
invasive methods based on the TDR and GPR techniques.|
|Description: ||An article published by Journal of Geophysics and Engineering, 6 (2009) 146–161. doi:10.1088/1742-2132/6/2/006|
|Appears in Collections:||College of Science|
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