Modelisation Des Effets De la Rugosite Sur L'Etude De L'Humidite Des Sols Par Radiometrie Micro-Ondes. Application a la Mission Spatiale Smos

TL;DR

This paper develops a numerical model to study how soil roughness and litter thickness profiles affect microwave emissivity measurements, aiding the validation of soil moisture retrieval algorithms for the SMOS satellite mission.

Contribution

It introduces an improved modeling approach that incorporates realistic litter thickness and roughness profiles into the emissivity calculations for multilayer soil systems.

Findings

Enhanced model accounts for variable litter thickness

Incorporates soil roughness effects into emissivity simulations

Supports better validation of soil moisture algorithms

Abstract

As part of the SMOS mission (Soil Moisture and Ocean Salinity) IMS and EPHYSE laboratories are involved in the study and validation of the inversion algorithm LMEB. In the framework of this study, we developed a model using the numerical modeling software-HFSS ANSOFT. It allows the computation of the emissivity of multilayer systems (soil-litter for example). We have improved our approach to incorporate new parameters that can have a significant effect on the measurements. Indeed, so far the effect of soil roughness associated with the litter has not been studied. Moreover, the thickness of litter is never constant and we must therefore introduce a realistic profile of litter thickness. This article presents our work to integrate these profiles in our numerical model. These profiles may be derived from measurements (litter thickness profiles or soil roughness profiles) or calculations (roughness profile). In both cases the input data of our model are files of XYZ points representing our profile.