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Master Thesis

Analyse des surcharges hydrologiques observées par géodésie spatiale avec l’outil Multi Singular Spectrum Analysis

Abstract : This work presents the development and prior validation of a MSSA (Multichannel Singular Spectrum Analysis) statistical analysis tool of time series. We applied this analysis tool to positioning time series from 267 permanent GPS stations in South America to study seasonal geophysical deformations induced by oceanic, atmospheric and hydrological loading effects. It is necessary to validate new loading deformation models refined to include the contributions of rivers and lakes from the three most important river basins in this area (Amazon, Orinoco and Rio Paraná). Indeed, classical loading models do not explain all the observed signals, with discrepancies between variations in GPS positions and predictions of up to 50% in South America, where river-induced effects are extremely large. Joint statistical analysis of these new models with GPS positioning time series confirmed the significant contribution of rivers in the magnitude of the hydrological loading effect affecting individual stations. In addition, the analysis of the mean annual amplitude of loading on the river basins allowed verifying the validity of these new loading models at the scale of the Amazon and Rio Paraná basins. These results are also consistent with observations from the GRACE space mission. The results obtained confirm the interest in producing new models with finer spatial resolution and improve the modelling of semi-annual effects.
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Master Thesis
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Submitted on : Wednesday, December 2, 2020 - 11:31:24 AM
Last modification on : Monday, February 15, 2021 - 3:09:10 AM
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  • HAL Id : dumas-03035549, version 1



Louis Bonhomme. Analyse des surcharges hydrologiques observées par géodésie spatiale avec l’outil Multi Singular Spectrum Analysis. Sciences de l'ingénieur [physics]. 2020. ⟨dumas-03035549⟩



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