ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...
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14. INDEX OF FIGURES<br />
Fig. 1. Hardware setup for s<strong>im</strong>ultaneous measurement of soil water<br />
content and electrical conductivity using T<strong>im</strong>e Domain<br />
Reflectometry method .........................................................................16<br />
Fig. 2. Relation between the soil refractive index, n, and its water<br />
content, θ, for mineral and organic soil samples as well as their<br />
mixtures. A - exper<strong>im</strong>ental data, B - regression n(θ). .........................18<br />
Fig. 3. Relations between the refractive index, n = ε , and volumetric<br />
water content, θ, and related regression lines......................................20<br />
Fig. 4. Relative refractive index, n = ε , as the function of water content<br />
for selected wood types .......................................................................21<br />
Fig. 5. Bulk electrical conductivity, EC a-TDR , of the investigated soil<br />
samples obtained using TDR pulse attenuation method<br />
accordingly to Eq. (3), versus reference data, EC a-4p , determined<br />
using four-electrode reference method................................................23<br />
Fig. 6. Comparison of the bulk electrical conductivity of the investigated<br />
soils, EC a-TDR , with the reference data, EC a-4p , after correction<br />
accordingly do the polynomial of Fig. 5 .............................................24<br />
Fig. 7. Frequency dispersion of the real part, ε’, and module, k, of the<br />
complex dielectric constant of the electrolyte for different<br />
conductivities.......................................................................................27<br />
Fig. 8. Frequency dispersion of the real part, ε’, of the complex dielectric<br />
constant and the loss angle, δ, for the electrolyte for its various<br />
electrical conductivities, EC w ..............................................................29<br />
Fig. 9. The relation n(θ ) for soil samples moistened by KCl solutions of<br />
different electrical conductivities, EC w ...............................................32<br />
Fig. 10. TDR interpretation of soil as a tree phases medium in dielectric<br />
mixing model α ...................................................................................33<br />
Fig. 11. Determination of the dielectric constant of soil solid phase using<br />
extrapolation and three-phase soil dielectric mixing model α. ...........37<br />
Fig. 12. Relation between the soil relative dielectric constant, ε, and soil<br />
volumetric water content, θ, for the investigated mineral soils.<br />
The solid line represents the empirical model (31) calculated for<br />
the average bulk density of the soil samples 1.42 [gcm -3 ]...................38<br />
Fig. 13. Comparison of soil relative dielectric constants of the investigated<br />
soil samples measured by TDR method (horizontal axis) and<br />
144