01 Oct 2021

01 Oct 2021

Review status: this preprint is currently under review for the journal ESSD.

Topo-bathymetric and oceanographic datasets for coastal flooding risk assessment: French Flooding Prevention Action Program of Saint-Malo

Léo Seyfried1, Laurie Biscara2, Fabien Leckler2, Audrey Pasquet1, and Héloise Michaud1 Léo Seyfried et al.
  • 1Shom, 42 Avenue Gaspard Coriolis, BP 45017 - 31032 Toulouse CEDEX 5, France
  • 2Shom, 13 rue du Chatellier, 29200 Brest, France

Abstract. The French Flooding Prevention Action Program of Saint-Malo requires assessment of coastal flooding risks. The first prerequisite is a knowledge of the topography and bathymetry of the bay of Saint-Malo. In addition to existing topo-bathymetric data, the acquisition of new multibeam bathymetric data is performed. The combination of these datasets allows the generation of two high resolution topo-bathymetric digital terrain models. Then, to understand the hydrodynamic conditions which cause coastal flooding, a dense and extensive oceanographic field experiment is conducted. Oceanographic data were acquired using a network of 22 moorings with 37 sensors, during winter 2018–2019. The network included 2 directional buoys, 2 pressure tide gauges, 18 wave pressure gauges, 4 single-point current meters, 7 current profilers and 4 acoustic wave-current profilers from mid-depth (25 m) up to the upper beach and the dike system. The oceanographic dataset provides an overview of hydrodynamics in Saint-Malo bay and wave processes leading to coastal flooding. The combination of high-resolution topo-bathymetric and oceanographic datasets provides a unique capability for model validation and process studies. The topo-bathymetric and oceanographic datasets are available freely at doi :,,  and

Léo Seyfried et al.

Status: open (until 16 Feb 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-316', Anonymous Referee #1, 09 Nov 2021 reply

Léo Seyfried et al.

Data sets

Sea cruise French Flooding Prevention Action Program of Saint-Malo Héloïse Michaud

Coastal topo-bathymetric DEM of the harbor of Saint-Malo and its surroundings SHOM DOPS/STM/BATHY/PROD

Coastal topo-bathymetric DEM of a part of the Norman-Breton gulf SHOM DOPS/STM/BATHY/PROD

Léo Seyfried et al.


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Short summary
The French Flooding Prevention Action Program of Saint-Malo focuses on improving the knowledge of coastal flooding risks. The proposed approach is to use in-situ data collection. Bathymetric and oceanographic measurement campaigns were conducted during the winter of 2018–2019. Topo-bathymetric and oceanographic datasets have been built from these measurement campaigns. These data allow the development and validation of numerical models to improve the prediction of coastal flooding risks.