Julie Billy

Julie Billy
French Geological Survey | BRGM · Direction Risques et Prévention

PhD

About

26
Publications
7,650
Reads
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223
Citations
Citations since 2016
19 Research Items
205 Citations
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2016201720182019202020212022010203040
Introduction
Julie Billy currently works at the BRGM, French Geological Survey. Julie does research in Geomorphology and Coastal Geology. Their researches are about beach ridge systems and coastal barrier.

Publications

Publications (26)
Article
Geophysical investigation of the entire coastal zone, including emerged and shallow marine areas, is difficult to conduct especially due to method limitations. Therefore, the land to sea transition zone is often few or not surveyed consequently blanked areas subsist in the backshore, foreshore and upper shoreface domains. This study aims to evaluat...
Article
Full-text available
Seawalls are commonly used worldwide to protect urbanized sea fronts. These alongshore protection structures are often blamed for hydro-sedimentary dynamics perturbations, but without clear and generalizable conclusions on long-term morphodynamic effects. In this paper, evolutions of beaches are studied from 1966 to 2021, comparing the urbanized se...
Poster
Full-text available
Brochure présentant les principaux apports du projet "WACA-F données historiques" sur la connaissance des littoraux et des risques côtiers du Sénégal, du Togo et du Bénin. Leaflet presenting the main contributions of the "WACA-F historical data" project on knowledge of the coasts and coastal risks of Senegal, Togo and Benin.
Poster
Full-text available
This leaflet presents the work carried out in the WACA-F project based on historical data (from the 19th and 20th century) available in Senegal, Togo and Benin. The methods of data processing and digitization are briefly presented, followed by the different treatments carried out for their exploitation. Then the coastal context of each country is...
Article
Full-text available
Mots-clés : Trait de côte, Erosion, Occupation du sol, Anthropisation, Artificialisation, Environnement littoral, Changement climatique, Atlantique, Afrique de l’Ouest. Résumé : Des sites comme Saint-Louis (Sénégal), Cotonou (Bénin), Lomé (Togo) ou Grand-Popo (site transfrontalier Togo-Bénin) sont généralement considérés comme emblématiques de l’...
Article
Foredunes are efficient natural coastal defenses acting as protective barriers during storm events. They also have the capacity to be an ecosystem hosting significant biodiversity. The economic development and/or recreational use of the foredune commonly results in a modification of natural functioning and the concomitant mixing of natural and anth...
Technical Report
Full-text available
Abstract West African countries are currently facing detrimental coastal erosion and coastline retreat. In this context, the WACA-F project funded by the MTES (French Environment Ministry) aims to make available to Senegal, Togo and Benin the data acquired historically by SHOM (from 1885-2006: nearly 243 maps and paper records) and IGN (7,800 aeria...
Article
Full-text available
Foredunes are efficient natural coastal defenses acting as protective barriers during storm events. A striking example is the response of coastal dunes along the Aquitaine Coast (SW France) to the 2013-2014 winter, which was the most energetic winter since at least the mid-20th century in most of the NE Atlantic. The aim of this study is to analyze...
Article
Full-text available
Comprehensive geophysical sub-surface investigations of coastal systems provide a better understanding of the organization of sediment deposits and the behavior of coastal areas. An innovative high yield multi-geophysical approach has been developed to investigate internal properties of coastal dunes and their associated environments, combining con...
Preprint
Full-text available
Des sites comme Saint-Louis (Sénégal), Cotonou (Bénin), Lomé (Togo) ou Grand-Popo (site transfrontalier Togo-Bénin) sont généralement considérés comme emblématiques de l'érosion côtière affectant l'Ouest africain. La mise en danger de la population et de forts enjeux sociaux-économiques posent des problèmes aux autorités en charge de la gestion du...
Article
Full-text available
Les plages et les dunes qui constituent les littoraux sont des systèmes dynamiques en constante adaptation. Le fonctionnement de l'intérieur de ces systèmes et leurs propriétés géophysiques sont peu connus. Pourtant ces connaissances sont essentielles pour anticiper l'aptitude des littoraux sableux à résister ou s'adapter face aux aléas, comme les...
Article
Full-text available
Billy, J.; Robin, N.; Hein, C.; FitzGerald, D., and Certain, R., 2018. Dominance of inherited geologic framework on the development of coastal barrier system. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85,...
Article
Comprehensive onshore-offshore surficial and sub-surface mapping of a composite barrier (combination of prograded, aggraded, and/or transgressive segments) have provided a better understanding of the (i) mechanisms responsible for the formation and development of coastal barrier systems, (ii) relationships and interactions among individual parts of...
Poster
Full-text available
This study produces : The 1st RSL reconstruction for the Saint-Pierre-et-Miquelon Archipelago Provides: (i) additional details of RSL changes in a region exhibiting great spatial variations in RSL histories (Newfoundland); ii) provides field confirmation that wave-built/aeolian stratigraphic contacts in beach ridges can provide a powerful tool for...
Article
Full-text available
Constructional sedimentary features can provide insight into past changes in relative sea-level (RSL) in regions where traditional bio-stratigraphic markers are absent. The paraglacial beach-ridge plain at Miquelon-Langlade, located 50 km south of Newfoundland, is an example of a well-preserved regressive barrier. Initiation of this plain correlate...
Article
The purpose of this PhD thesis was to define a complete and continuous sea-land-sea view of a paraglacial coastal barrier system, combining morphological and architectural approaches. Particularity of the Miquelon-Langlade isthmus (NO Atlantic) lies in its diversity and complexity of systems (spits, beach ridges, and lagoon) that fit together to fo...
Article
Full-text available
Estuarine tidal bars emplaced in estuaries are complex sediment bodies composed of sand and mud provided by rivers. This study focuses on the Plassac Tidal Bar, which is the unique lobate-shape tidal bar of the Gironde Estuary, located at the very upstream extremity of the bay-head delta, because no detailed sedimentological studies have been made...
Article
The Saint-Pierre-et-Miquelon Archipelago (France) is located in the NW Atlantic Ocean, proximal to the Cabot Straight outlet of the Gulf of Saint-Lawrence, and 50 km south of Newfoundland (Canada). The Miquelon-Langlade Barrier is a 12-km-long, 100-2500-m-wide, north-south oriented isthmus connecting two bedrock islands (Miquelon to the north; Lang...
Article
Full-text available
This study shows the short-term sediment dynamics (2010) and the long-term morphological evolution (1905 to 2008) of a tidal sand bar emplaced in the Gironde Estuary, the Plassac Tidal Bar. This tidal sand bar was selected because it corresponds to a morphological category (lobate shape) that was not previously studied in the setting of estuarine b...

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Projects

Projects (6)
Project
The West Africa Coastal Areas program (WACA) was initiated by the World Bank in 2015. It brings together 13 African countries to manage and preserve their coastlines in a sustainable manner through the establishment of cooperation and regional integration of means. This programme is also a catalyst for initiatives and complementary financing. It is within this framework that the French Ministry of Energy and Solidarity Transition (MTES) has financed and launched the WACA-F project. The WACA-F project is made up of four French partners with complementary skills (CEREMA , coordinator of the project, SHOM, IGN and BRGM). The WACA-F project aims to provide three West African countries (Benin, Senegal and Togo) with historical data on the coastline. Indeed, both SHOM and IGN have a very rich historical database in their archives. These data are in the form of aerial photographs, sounding data and bathymetric maps dating back to the middle of the 20th century and the oldest ones to the end of the 19th century. These data thus constitute a fundamental knowledge base for the analysis and understanding of the evolution of the West African coasts. Two main objectives are assigned to the WACA-F project: - to inventory, digitize and then georeference these data according to current standards in order to provide them to the countries concerned. - to demonstrate the contribution of these old data to improve knowledge of coastal evolution and more particularly coastal erosion.
Project
The COasTAUD Framework is a set of Tools to assess coastal impacts and uncertainties. It is developped since 2015 and support several projects, including ERA4CS and support to public Policy (e.g. Aquitaine and Guadeloupe coastal adaptation projects)
Project
This project aims to explore coastal sytems using geophysics to understand the organisation of sediment deposits and the behaviour of coastal areas. The architecture of coastal dunes highlighted by geophysical and geotechnical parameters distribution provide information about their formation, resilience and dynamic. The latter constitute the fundamentals elements of predictive models of the evolution of the coastal systems.