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http://hdl.handle.net/10136/492
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| Title: | Temperature corrections for electromagnetic induction measurements in field soils & Tikhonov regularization for determination of depth profiles of electrical conductivity using non-invasive electromagnetic induction measurements |
| Authors: | Uram, Thomas G. |
| Issue Date: | 26-Aug-2009 |
| Abstract: | Apparent electrical conductivities(ECa)of field soils vary considerably with variations in temperature. Reliable comparisons between soil electrical conductivity measurements at different dates are only possible after conversion of the measured electrical conductivities to those at a reference temperature of 25 degrees Celsius. The objective of this study is to investigate in which manner conductivities measured with the electromagnetic induction method can be corrected for soil temperature. Theoretical temperature profiles were generated for homogeneous soil profiles with a uniform electrical conductivity of 20 milliseimens per meter (mS/m) at 25 oC. Electromagnetic (EM) responses were calculated and correction factors determined. During the warmest and coldest periods of the year, the correction factors were not accurately predicted and resulted in corrected EM responses that exhibited considerable error, whereas, during the more moderate times of the year correction factors were more accurately predicted and the corrected EM responses closely matched the original 20 mS/m electrical conductivity. Methods of determining an average soil profile temperature resulted in correction factors that, when applied to the measured electrical conductivities, the resulting EM responses remained within 10% of the original 20mS/m electrical conductivity. |
| URI: | http://hdl.handle.net/10136/492 |
| Appears in Collections: | Theses
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| Uram, Thomas G..pdf | | 1665Kb | Adobe PDF | View/Open |
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