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Etude conjointe des réseaux de drainage et des paléocôtes plio-quaternaires soulevées : exemples de l’Indonésie et du golfe Normand Breton

Abstract : Studies dealing with drainage developed on sequences of strandlines (e.g. marine and coral reef terraces) are scarce. To better our knowledge on the evolution of these common coastal landforms, an innovative morphometric analyse was developed and tested in different geological, tectonical and climatic setting. This analyse includes the calculation of 15 morphometric indices extracted from the relief, the drainage network and the coast. Three regions have been studied: Sumba Island (Indonesia), Huon Peninsula (Papua-New-Guinea) and the NW of Normandy (France). The two Asian areas have been selected to study the evolution of drainage network developed on sequences of coral reef terraces evidencing a wide range of uplift rates (0.02 to 3.4 mm/yr). There, the drainage evolution have been quantified by the analysis of eight morphometric indices then correlated to uplift rates. In NW Normandy (France), the sequence of marine terraces and rasas undergo low uplift rates (~0.06 mm/yr). The morphometric analysis of this area have been realised in order to constrain the degradation of these coastal reliefs in a temperate climate. These local studies better our knowledge on sequences of fossil shorelines and their associated uplift rates. Finally, the chronology of the development of the neoformed drainage of the studied areas have been established.
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Submitted on : Monday, November 6, 2017 - 5:11:31 PM
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Maëlle Nexer. Etude conjointe des réseaux de drainage et des paléocôtes plio-quaternaires soulevées : exemples de l’Indonésie et du golfe Normand Breton. Géomorphologie. Universite de Caen Normandie, 2015. Français. ⟨tel-01258570⟩

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