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Detailed Reference Information |
Oswald, B., Benedickter, H.R., Bächtold, W. and Flühler, H. (2003). Spatially resolved water content profiles from inverted time domain reflectometry signals. Water Resources Research 39. doi: 10.1029/2002WR001890. issn: 0043-1397. |
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We present a method for extracting spatially resolved water content profiles θ(x) from a two-wire time domain reflectometry (TDR) probe. The profile θ(x) is represented in terms of the dielectric ϵr(x) and ohmic σ(x) properties in the longitudinal direction of the TDR probe. We solve the inverse problem iteratively by combining a one-dimensional time domain solution of the transmission line equations and a genetic optimization method. The method is capable of finding the global optimum in a complicated error landscape without initial assumptions, except physically reasonable limits. The method utilizes both the position and the magnitude of the TDR signal. We analyze water content profiles from laboratory measurements and demonstrate that the achievable spatial resolution can be made as low as 2 cm and even smaller. The present implementation of the numerical code demonstrates the practical feasibility of spatially resolved water content profiles. |
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Abstract |
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Keywords
Electromagnetics, Guided waves, Hydrology, Soil moisture, Hydrology, Unsaturated zone, Hydrology, Instruments and techniques |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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