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Climatic, telluric and anthropic forcing on erosion, from the decadal to the millenial timescale: the study case of La Réunion Island

Using a photogrammetry technique on aerial photographs of La Réunion Island, the controls of climate and vegetation on erosion are studied.

Climatic, telluric and anthropic forcing on erosion, from the decadal to the millenial timescale: the study case of La Réunion Island

Start: 01 October 2022

Related theme(s):
Earth System Science

Erosion is one of the important mechanisms that shape the landscapes of our planet and many factors such as climate, tectonic, vegeta^on,… are proposed as controls on erosion processes. The goal of this thesis is to study clima^c forcing and to try and understand their influence and importance on erosion. More specifically, this thesis focuses on studying the influence of climate and vegeta^on on a short ^mescale (decadal) using the study case of La Réunion.

La Réunion is a French volcanic island located in the Indian Ocean. It cons^tutes an ideal natural laboratory to study the climate-erosion interac^on due to its tropical climate characterised by a strong seasonal (cyclones) and geographic (windward VS leeward coast) contrast. Moreover, due to the demographic muta^on of the last 50 years and the reforesta^on of part of the island, La Réunion appears to be a place where the influence of vegeta^on cover on short-term erosion (and indirectly of anthropogenic impact) can be studied.

To study these forcing and their importance, this thesis relies on the use of op^cal imagery and more precisely of a photogrammetry technique on aerial photographs of La Réunion to design Digital Eleva^on Models to quan^fy the morphology changes of the island as well as orthoimages to connect the vegeta^on cover evolu^on to the morphology changes.

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