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Étude morphologique de la formation des ravines sur les dunes martiennes : approche comparative Terre/Mars

Abstract : The recent geological history of Mars remains poorly studied, in comparison to theearly history of Mars (>3,5 Ga). However, the acquisition of new high-resolution imagesallowed to identified the presence of gullies on the surface of recent landforms such asdunes. In this work, we focused on characterizing the morphology of gullies and theirprocess(es) of formation. These new observations revive the issue of the presence of liquid water present on the surface of Mars than either pure or as a mixture (brine, debris flow ...). Experimental simulations in a cold room at Martian and terrestrial atmospheric pressure have been conducted. In particular, they allowed us to quantify the role of water content in the active layer of the permafrost in order to better constrain the mechanism of formation of gullies and their motion. We also described the seasonal evolution of small branched networks developed at spring during the 2007-2012 period.
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Gwénaël Jouannic. Étude morphologique de la formation des ravines sur les dunes martiennes : approche comparative Terre/Mars. Sciences de la Terre. Université Paris Sud - Paris XI; Università degli studi G. D'Annunzio (Chieti, Italie), 2012. Français. ⟨NNT : 2012PA112387⟩. ⟨tel-00772487⟩

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