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Apport de l'imagerie satellitaire pour l'identification et la cartographie des habitats littoraux de Mayotte soumis à une subsidence rapide

L’île de Mayotte (canal du Mozambique), offre une grande diversité de littoraux influencés par son vaste complexe récifo-lagonaire. Ces habitats (plages, platiers coralliens, herbiers, mangroves…
Localisation de la zone d’étude (a et b), et contexte associé aux mouvements verticaux de Mayotte : c) subsidence observée, données GNSS (Coordination observations géodésiques à Mayotte) et d) variation du niveau marin observé depuis 1963 (données REFMAR).

XYZ n°177 : Niveau de la mer

Dans ce numéro spécial, une collaboration de l'Association des amis du marégraphe de Marseille et de l'AFT, le lecteur pourra, lui-même, se faire une idée, aussi scientifique que précise, du…
XYZ n°177

Sea level changes: the data available at the PSMSL and SONEL and the results of satellite altimetry

Sea level changes are a complex and quite discussed topic in the media, mostly because of their relationship with “climate change”. The first instruments to evaluate sea level changes are the Tide…
The situation of PSMSL data stations

Observational study of the heterogeneous global meteotsunami generated after the Hunga Tonga–Hunga Ha'apai Volcano eruption

The Hunga Tonga–Hunga Ha’apai volcano eruption of January 15th 2022 generated a global atmospheric and oceanic response that was recorded by an unprecedented amount of sensors. The…
Location of the tide gauges used in this work (small blue dots). The red diamonds with letters show the location of the atmospheric pressure time series plotted in Fig. 2. The cyan dots with numbers show the location of the sea level time series plotted in Fig. 4. The colored patches show the different world regions selected to perform the analysis shown in Fig. 5. The map has been drawn with MATLAB33 using the M_Map34 toolbox (https://www.eoas.ubc.ca/~rich/map.html).

Dynamics of CO₂, CH₄, and N₂O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz

A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal – Ria Formosa lagoon. To this…
Graphical abstract

Water-level changes and subsidence rates along the East Sea coastline of the Saigon-Dong Nai River Estuary and the Mekong Delta

Southeast Asian deltas are highly threatened areas for flooding as a response to the combined effects of natural compaction and subsidence exacerbated by human impacts, e.g. oil, gas and water…
Seasonal variation of mean tidal ranges at seven stations from Vung Tau to Ganh Hao based on the analyses of a 19-year dataset (1997–2015).

Cloud-based near real-time sea level monitoring using GNSS reflectometry

In addition to traditional tide gauges, the ground-based global navigation satellite system reflectometry (GNSS-R) that utilizes signal-to-noise ratio data from a single GNSS receiver has become…
Three-level structure of the cloud-based near real-time sea level monitoring system. Data can be propagated between the adjacent layers via the Internet

Monitoring absolute vertical land motions and absolute sea-level changes from GPS and tide gauges data over French Polynesia

In this study, we estimate the absolute vertical land motions at three tidal stations with collocated Global Navigation Satellite System (GNSS) receivers over French Polynesia during the period…
The five archipelagoes in French Polynesia. The locations of the five geodetic TGs are shown as orange point. (Figure is taken from J.P. Barriot et al. [5].).

Multi-GNSS Combination Multipath Reflectometry Based on IVMD Method for Sea Level Retrieval

Sea level monitoring is particularly important in coastal areas that are vulnerable to marine disasters. It was recently demonstrated that the global navigation satellite system multipath…
Results of robust regression and IVMD algorithm for the stations: (a) the results of robust regression algorithm for the BRST during DOY 177–191, 2021; (b) results of IVMD algorithm for the BRST during DOY 177–191; (c) results of robust regression algorithm for the HKQT during DOY 177–191; (d) results of IVMD algorithm for the HKQT during DOY 177–191.

Impact of an exceptional winter flood on benthic oxygen and nutrient fluxes in a temperate macrotidal estuary: Potential consequences on summer deoxygenation

Despite 20 years of control on eutrophication, episodes of summer hypoxia still occur in the Loire estuary, impacting water quality and posing a key scientific and management challenge. This work…
Map of the Loire estuarine region. The Le Pellerin sampling site is indicated by a crossed circle.