3D modeling and dielectric characterization of geological profile. Application to the improvement of the study of moisture of grounds by radiometry
Résumé
The surface moisture of the ground is an important parameter to describe the exchanges of water and energy between the ground and the atmosphere. Studies have showed that passive microwaves sensors could be used to scan the moisture of surface of the grounds. The solution which has been retained by the team associated with mission SMOS ( Soil Moisture and Ocean Salinity) consists in using a radiometer (1.4 GHz) in order to improve the knowledge of the microwaves emissions of the grounds. Thanks measurements it is possible to know an equivalent permittivity of the measured grounds. However, the effect of the cover of vegetation, the temperature of the ground, the snow cover, the topography or the variations of moisture have a considerable role in the microwave emission of the surface. The objective of this work which we present in this paper is to develop a numerical model to simulate complex geological structures. The goal of this model is to characterize these geological structures by calculating their equivalent permittivity in order to be able to associate each measurement of the radiometer to an equivalent moisture.
Domaines
Electromagnétisme
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