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Variabilité du niveau marin relatif le long du littoral de Brest (France) par combinaison de méthodes géodésiques spatiales (altimétrie radar, InSAR et GPS)

Abstract : The sea level rise induced by global warming is not uniform along the coastlines due to regional variability of sea level and especially due to vertical land motion which may represents a dominant factor. Therefore, the sea level evolution must be known relative to the land to provide adapted knowledges towards a most efficient coastal management. Information about relative sea level are currently provided directly by tide gauges which measured simultaneously sea level and vertical land variations. However, two important issues are associated with the use of tide gauges. First, supplemental information provided by permanent GPS stations is required to separate vertical land motion from ocean climate signals in tide gauge records, and hence to understand the causes of future coastal sea level changes and their relative importance. Second, vertical land motion can show local spatial patterns, which limits the spatial validity of the point-wise information provide by tide gauges. Using Interferometric Synthetic Aperture Radar (InSAR) and high-precision GPS data, the above-mentioned limitations were addressed in the case study of Brest (France). This study shows that, over the past decades, Brest and its surroundings are overall stable except for the embankment areas of the commercial and military harbours. The GPS-calibrated InSAR results were then further combined with radar altimetry data to obtain relative sea level trends along the Brest coastline with an unprecedented high-spatial resolution. The approach developed in this thesis is applicable beyond the case study of Brest, especially in coastal areas where tide gauge data are not available.
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Cyril Poitevin. Variabilité du niveau marin relatif le long du littoral de Brest (France) par combinaison de méthodes géodésiques spatiales (altimétrie radar, InSAR et GPS). Sciences de la Terre. Université de La Rochelle, 2019. Français. ⟨NNT : 2019LAROS010⟩. ⟨tel-02475558⟩

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