Publications scientifiques

L’étude présentée sur les oscillations résonantes dans des bassins semi-ouverts de la côte provençale est basée sur l’analyse des données de niveaux issus de stations du réseau d’observation HTM-NET, composées de deux capteurs piézométriques, l’un immergé et l’autre émergé, permettant de connaitre la pression atmosphérique, le niveau d’eau et la température avec une période d’échantillonnage de 2 min. Elle concerne les baies de La Ciotat, de Sanary, la Rade de Toulon (grande et petite rades), le Golfe de Giens et la Rade d’Hyères.

The proposed article deals with the assessment of coral reef impact on runup-induced coastal flooding over a two years and 10 months period at Anse Maurice, a reef-fringed pocket beach located at Guadeloupe Island, in the Caribbean region. The reef is mainly constituted by complex structures of Acropora Palmata dead colonies. Daily maximum marine inundation was assessed using a fixed video system. Daily Highest Runups (DHR) remains primarily correlated to individual storm event as extreme runups are observed in correlation with storm swells.

On 5 December 2018, a magnitude M_w  7.5 earthquake occurred southeast of Maré, an island of the Loyalty Islands archipelago, New Caledonia. This earthquake is located at the junction between the plunging Loyalty Ridge and the southern part of the Vanuatu Arc, in a tectonically complex and very active area regularly subjected to strong seismic crises and earthquakes higher than magnitude 7 and up to 8.

In this chapter, we present a second example of statistical estimation of extreme quantiles: millennial quantiles for storm surges at Brest (France), based on hourly sea-level measurements. We run sensitivity tests on parameter values, on the choice of analytic models for distributions, and on the statistical estimation methods chosen. Uncertainty in estimates and associated confidence intervals are also calculated and compared.

Dike breaches occurs regularly during storm events. This phenomenon contributes to amplify considerably the impact of floods on coastal areas. It represents an important cost for repairing existing infrastructures in the vicinity of the sea-dike. Then, they must be upgraded to prevent breaches. In the present study, ANEMOC and REFMAR dataset were analysed, off Camargue coasts, to quantify the storm hazards in terms of wave height and sea level wind setup. Repartition laws were adjusted on dataset to build a 2D-copula which is used to estimate events return periods.

Submersion risks assessment requires different tools and methods from regional to coastal scales. The Shom’s strategy relies on numerical modelling and observational systems applied in a challenging multi-scale context. At regional scales, storm surge and wave models Hycom and Wavewatch III, bathymetric digital terrain models (DTMs) and observational tide/buoy networks used within the operational national storm surge service (Homonim project with Météo-France) are presented, as well as their applications in climatological 40-year hindasts.

Significant developments have been made in the observation systems and techniques of estimating sea level towards meeting the standard accuracy requirement of Global Climate Observation Systems (GCOS). This study undertakes a systematic review of the current advances in estimating sea level change in the context of the 4^th industrial revolution. Trends in the use of main observation systems such as tide gauges, satellite altimetry, and ancillary systems such as GNSS and Autonomous Surface Vehicles were explored.

Satellite altimetry and tide gauges are the two main techniques used to measure sea level. Due to the limitations of satellite altimetry, a high-quality unified sea level model from coast to open ocean has traditionally been difficult to achieve. This study proposes a fusion approach of altimetry and tide gauge data based on a deep belief network (DBN) method.