Trajectoire hydrogéomorphologique d'un petit cours d'eau périurbain francilien : aménagement, "désaménagement"?

Abstract : The objective of this research is, first of all, to identify and characterize the spatio-temporal trajectory of a small low energy periurban river, through the example of the Merantaise River located in the Seine Basin. These objects of investigation are too often neglected by the scientific community even though the environmental issues of ecological restoration politics, advocated for several decades by the WFD, are important (impacts of urbanization and ancient watermills). An interdisciplinary geohistorical and hydromorphological approach allowed to reconstruct the past and present evolution of the river: the valley has been heavily developed since the Middle-Ages by modest hydraulic equipment but has beenaffected on more than 80% of the channel. Water mills were abandoned during the 20th century, partially clearing the channel. Nowadays, the current trajectory is marked by recent significant morphological adjustments and is less controlled by old hydraulical structures than by current anthropogenic pressures affecting the watershed (urbanization, transport and drainage network, intensification of agriculture). Finally, this thesis is also an opportunity to question the ecologically relevant and hydromorphologically sustainable nature of ecological restoration. This doctoral work also proposes to consider restoration operations as new river facilities responding to new socio-political needs and fully participating of the river's functional trajectory.
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Marion Jugie. Trajectoire hydrogéomorphologique d'un petit cours d'eau périurbain francilien : aménagement, "désaménagement"?. Géographie. Université Panthéon-Sorbonne - Paris I, 2018. Français. ⟨NNT : 2018PA01H087⟩. ⟨tel-02181434⟩

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