Modified Rayleigh Model in the Interpretation of Soil Moisture Data
Received Date: Jan 06, 2012 / Accepted Date: Apr 16, 2012 / Published Date: Apr 22, 2012
Surface soil moisture is important to understand environmental systems and dielectric constant is a convenient physical parameter to describe this. Dielectric Mixing models relate the effective dielectric constant of a heterogeneous medium with the properties of constituent materials. The dielectric properties of the soil is known to have dependence on Soil moisture content along with other factors like texture, frequency, salinity etc. In this investigation, experimental data of Dielectric Constant of various types of soil has been taken at 1.4 GHz and 18 GHz to fit unknown parameters in modified Rayleigh mixing model. Calculation of Effective dielectric constant and emissivity of different types of soil has been carried out and using modified Debye formulation, spread in relaxation and relaxation frequency is also obtained. Effective dielectric constant increases with rise in volumetric Soil Moisture, while the emissivity decreases. Further the emissivity increases with the increase in Roughness parameter. Relaxation Frequency (fr) and spread of relaxation (α) are identified as microscopic parameters to characterize the soil texture along with volumetric moisture. These parameter values decreases with an increase in soil moisture. These data can be obtained in laboratory and field conditions and can be of interest to agricultural scientists.
Keywords: Soil moisture; Dielectric constant; Emissivity; Roughness parameter
Citation: Behari J, Sharmendra V (2012) Modified Rayleigh Model in the Interpretation of Soil Moisture Data. Hydrol Current Res 3: 129. Doi: 10.4172/2157-7587.1000129
Copyright: © 2012 Behari J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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