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Monitoring Sea Level and Topography of Coastal Lagoons Using Satellite Radar Altimetry: The Example of the Arcachon Bay in the Bay of Biscay
Radar altimetry was initially designed to measure the marine geoid. Thanks to the improvement in the orbit determination from the meter to the centimeter level, this technique has been providing accurate measurements of the sea surface topography over the open ocean since the launch of Topex/Poseidon in 1992. In spite of a decrease in the performance over land and coastal areas, it is now commonly used over these surfaces. This study presents a semi-automatic method that allows us to discriminate between acquisitions performed at high tides and low tides.
E. Salameh, F. Frappart, V. Marieu, A. Spodar, J.-P. Parisot, V. Hanquiez, I.Turki, B. Laignel
Remote Sensing, volume 10

Coastal monitoring solutions of the geomorphological response of beach-dune systems using multi-temporal LiDAR datasets (Vendée coast, France)
Shield volcanoes are described as low-angle edifices built primarily by the accumulation of successive lava flows. This generic view of shield volcano morphology is based on a limited number of monogenetic shields from Iceland and Mexico, and a small set of large oceanic islands (Hawaii, Galápagos). Here, the morphometry of 158 monogenetic and polygenetic shield volcanoes is analyzed quantitatively from 90-meter resolution SRTM DEMs using the MORVOLC algorithm.
B. Le Mauff, M. Juigner, M. Robin, P. Launeau, P. Fattal
Geomorphology, volume 304

Multi-Satellite Altimeter Validation along the French Atlantic Coast in the Southern Bay of Biscay from ERS-2 to SARAL
Monitoring changes in coastal sea levels is necessary given the impacts of climate change. Information on the sea level and its changes are important parameters in connection to climate change processes. In this study, radar altimetry data from successive satellite missions, European Remote Sensing-2 (ERS-2), Jason-1, Envisat, Jason-2, and Satellite with ARgos and ALtiKa (SARAL), were used to measure sea surface heights (SSH). Altimetry-derived SSH was validated for the southern Bay of Biscay, using records from seven tide gauges located along the French Atlantic coast.
P. L. Vu, F. Frappart, J. Darrozes, V. Marieu, F. Blarel, G. Ramillien, P. Bonnefond, F. Birol
Remote Sensing, volume 10
![Timeline for radar altimeters used in our study (modified from [25]).](/sites/default/files/styles/large/public/2025-01/radar.png?itok=st25gSb3)
Nonlinear dynamics of the sea level time series in the eastern English Channel
Coastal flooding due to surge events represents natural hazards with huge potential consequences for coastal regions. Sea level time series display variations on a large range of timescales, with a deterministic component associated with tidal variations and a stochastic component primarily associated with meteorological forcing, the non-tidal residual. The deterministic component can be evaluated using a model taking into account astronomical forcing and topographic information.
F. G. Schmitt, A. Crapoulet, A. Hequette, Y. Huang
Natural Hazards, volume 91

Investigating the impacts of the regression of Posidonia oceanica on hydrodynamics and sediment transport in Giens Gulf
Posidonia oceanica plays a significant role in the stabilization and protection of the coast in Gulf of Giens. Unfortunately, its distribution has been declining remarkably due to both anthropogenic interventions and natural factors. The present study focuses on the numerical simulation of the presence of Posidonia as well as the influence of its disappearance on hydrodynamics and sediment transport along Alamanarre beach.
M. Tuan Vu, Y. Lacroix, V. T. Nguyen
Ocean Engineering, volume 146

Historical Sea Level in the South Pacific from Rescued Archives, Geodetic Measurements, and Satellite Altimetry
Automatic sea-level measurements in Nouméa, South Pacific, started in 1957 for the International Geophysical year. Data from this location exist in paper record for the 1957–1967 period, and in two distinct electronic records for the 1967–2005 and 2005–2015 period. In this study, we digitize the early record, and established a link between the two electronic records to create a unique, nearly 60 year-long instrumental sea-level record. This work creates one of the longest instrumental sea-level records in the Pacific Islands.
J. Aucan, M. A. Merrifield, N. Pouvreau
Pure and Applied Geophysics, volume 174, pp3813–3823

Analyse des niveaux d'eau avec l'action des vagues au droit d'une plage de Méditerranée
La façade maritime méditerranéenne est bordée par plusieurs départements littoraux sur lesquels des enjeux de gestion du Domaine Public Maritime naturel (DPM) forts existent. La délimitation du DPM est complexe et un éventail de techniques est disponible. Afin d’apporter des éléments d’appréciation, le Cerema s’est penché sur l’approche probabiliste qui vise à estimer l’action des vagues au niveau du rivage à partir des données hydrauliques disponibles. Les périodes de retour associées au niveau d’eau avec l’action des vagues sont étudiées pour une plage à enjeux de Méditerranée.
X. Kergadallan, N. Metzler
Revue Paralia, volume 10

Short-term forecasting of saltwater occurrence at La Comté River (French Guiana) using a kernel-based support vector machine
Saltwater intrusion into rivers is a major concern for freshwater exploitation and management in French Guiana (South America). To detect and analyse saltwater occurrence, a permanent station was installed on La Comté River to measure the electrical conductivity C. The objective of the present study was twofold. First, the temporal link between C, sea water level SWL and river discharge Q was explored during the dry seasons from 2009 to 2012 (total measurement duration of ~6 months). A lag of 3 h between C and SWL was evidenced (i.e.
J. Rohmer, N. Brisset
Environmental Earth Sciences, volume 76

Homogenous regions based on extremogram for regional frequency analysis of extreme skew storm surges
To resist marine submersion, coastal protection must be designed by taking into account the most accurate estimate of the return levels of extreme events, such as storm surges. However, because of the paucity of data, local statistical analyses often lead to poor frequency estimations.
M. Andreewsky, S. Griolet, Y. Hamdi, P. Bernardara, R. Frau
NHESS, preprints
