HAL : hal-00724130, version 1

arXiv : 1208.3936

DOI : 10.1111/j.1365-246X.2012.05577.x

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Geophysical Journal International 190, 3 (2012) 1455-1463

Influence of grain size, shape and compaction on georadar waves: example of an Aeolian dune.

Julien Guillemoteau 1, Maksim Bano 1, Jean-Rémi Dujardin 1

(18/07/2012)

Many Ground Penetrating Radar (GPR) profiles acquired in dry aeolian environment have shown good reflectivity inside present-day dunes. We show that the origin of this reflectivity is related to changes in grain size distribution, packing and/or grain shape in a sandy material. We integrate these three parameters into analytical models for bulk permittivity in order to predict the reflections and the velocity of GPR waves. We consider two GPR cross-sections acquired over Aeolian dunes in the Chadian desert. The 2D migration of GPR data suggests that dunes contain different kinds of bounding surfaces. We discuss and model three kinds of reflections using reasonable geological hypothesis about Aeolian sedimentation processes. The propagation and the reflection of radar waves are calculated using the 1D wavelet modelling method in spectral domain. The results of the forward modelling are in good accordance with real observed data.

1 :	Institut de physique du globe de Strasbourg (IPGS)
	CNRS : UMR7516 – INSU – Université de Strasbourg

Équipe de recherche : GE

Domaine

:

Planète et Univers/Sciences de la Terre/Géophysique Physique/Physique/Géophysique Sciences de l'environnement/Milieux et Changements globaux

Mots Clés : Ground penetrating radar: modelling and interpretation – Electrical properties – Numerical solutions.

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Contributeur : Julien Guillemoteau <>

Soumis le : Vendredi 17 Août 2012, 23:22:16

Dernière modification le : Lundi 20 Août 2012, 13:40:40