Laurent Dezileau

Laurent Dezileau
Université de Caen Normandie | UNICAEN · UMR 6143 M2C Laboratoire de Morphodynamique Continentale et Côtière

About

130
Publications
37,136
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2,694
Citations
Citations since 2017
44 Research Items
1551 Citations
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2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
Introduction
Laurent Dezileau currently works at the UMR M2C Morphodynamique Continentale et Côtière , Université de Caen Their current project is 'FP7-IRSES MEDYNA: Maghreb-EU Research Staff Exchange on Geodynamics, Geohazards and Applied Geology in Northwest Africa'.

Publications

Publications (130)
Article
River flooding triggered by extreme rainfall events is a major natural hazard that frequently causes fatalities and damages in southeastern France. A 2000-year record of flooding from the Hérault River basin was reconstructed using magnetic susceptibility data from lagoon deposits, supported by documentary databases of floods in coastal river basin...
Article
Full-text available
The coast of Chile has been exposed to marine submersion events from storm surges, tsunamis and flooding due to heavy rains. We present evidence of these events using sedimentary records that cover the last 1000 years in the Pachingo wetland. Two sediment cores were analyzed for granulometry, XRF, pollen, diatoms and TOC. Three extreme events produ...
Article
Full-text available
The Tunisian coast has been affected in the past by many events of extreme marine submersion (storms and tsunamis). A high-resolution study along two sediment cores taken from the lagoon of Ghar El Meleh was performed to identify the different paleoextreme events and to reconstruct the paleoenvironmental changes in the northeastern part of Tunisia...
Presentation
Full-text available
Project for the implementation of an observatory of the coastal area of the North Gulf of Tunis, Ghar el Melh lagoon, which experiences a rapid degradation of its environnemental conditions, beach retreat, water quality, marine submersion
Article
Recent reductions of sediment transport are observed in Bouregreg River and estuary close to Rabat city in Morocco. The cause of this evolution in sediment transport which may be due to human (dam, pollution), climate variability and natural events has been investigated from a paleo-hydrological approach. Sedimentological and geochemical analyses o...
Article
Full-text available
The aim of this project was to establish past variations in the main oceanographic and climatic features of a transitional semiarid ecosystem on the north-central Chilean coast. We analyzed recent sedimentary records retrieved from two bays, Guanaqueros and Tongoy (30∘ S), for geochemical and biological analyses, including the following: sensitive...
Article
Full-text available
The Atlantic coast of Morocco has been exposed to marine submersion events from storm surges and tsunamis which have resulted in human and economic losses. The absence of long term records for these hazards makes it difficult to trace their behavior through time, which is the first step to prepare proactive adaptation strategies for events that may...
Preprint
Full-text available
The Tunisian coast has been affected in the past by many events of extreme marine submersion (storms and tsunamis). A high-resolution study along two sediment cores GEM3 and GEM4 taken from the lagoon of the Ghar el Melh was performed to identify the different paleo-extreme events and to reconstruct the paleo-environmental changes of the North-east...
Article
Forcings and mechanisms underlying Holocene climate variability still remain poorly. This work review already published paleoclimatic time series and proposes an alternative way to compare them using spectral analysis. Such an approach may emphasize joint features between different signals and lead us closer to the causes of climate changes. Ten pa...
Article
South-Eastern Spain is a particularly suitable area for studying the impact of human societies on their environment. We present a new high resolution and continuous pollen sequence from the coastal lagoon of Mar Menor in the Murcia region. This new sequence covers the last 6500 years, from the end of the Neolithic to the present period, with a robu...
Article
Forcings and mechanisms underlying Holocene climate variability still remain poorly. This work review already published paleoclimatic time series and proposes an alternative way to compare them using spectral analysis. Such an approach may emphasize joint features between different signals and lead us closer to the causes of climate changes. Ten pa...
Article
Full-text available
The behavior of the shelly beach ridge system forming a more or less continuous barrier lying along the southern coast of the hypertidal Mont-Saint-Michel bay (NW France) is examined using a set of various data including aerial photographs since 1947, sediment cores collected in back-barrier salt marshes, ground penetrating radar profiles, and diff...
Preprint
Full-text available
The North Atlantic coast of Morocco has been affected historically by marine submersion events resulting from both storms and tsunamis and causing human and economic losses. The development of proactive adaptation strategies requires the study of these events over centennial to millennial timescales. Using a 2.7 m sediment core sampled from the Tah...
Article
Extreme precipitation events and multi-annual droughts, especially in arid to semi-arid subtropical regions, are among the most critical El Niño Southern Oscillation (ENSO) and global climate change impacts. Here, we assess the variability of torrential rainfall during the Late Holocene and its projection into the 21st century at the southern edge...
Article
Full-text available
The aim of this study is the reconstitution of the recent morpho-sedimentary evolution of the Medjerda River delta. We examine the spatio-temporal evolution of the Medjerda shoreline between 1936 and 2016 using satellite images, complemented by sedimentological and geochemical analyses and 210Pbex and 137Cs radiometric data. The general tendency of...
Technical Report
Full-text available
L'objectif du projet Sédibaie était de comprendre comment les replats de marée du Sud de la Baie du Mont Saint Michel et les bancs coquilliers qui les bordent ont fonctionné au cours des derniers siècles, et de déterminer quels ont été les différents facteurs de cette évolution. Plusieurs actions ont été menées qui permettent de traiter trois échel...
Chapter
Full-text available
The present work is based on The RYSCMED project supported by PHC-UTIQUE 2016–2018 (16G 1005–34854QC). The RYSCMED is an interdisciplinary project which gathers different disciplines (e.g. sedimentology, hydrology, geochemistry, ecology, paleontology, biochemistry, archeology) to quantify the sediment flow of the land-sea system. This research aims...
Book
Full-text available
The geochemical and grain size analysis were carried outon surface and down core sediments from the present-dayalluvial-coastal plain of the Medjerda River, Gulf ofTunis, Tunisia. The aim of this paper is to characterize thegeochemical and grain size distribution of sediments andits relationship with the hydrodynamics extreme eventsoccurring during...
Article
Study of the hydro-sedimentary dynamics of lakes provides key information on hydrological changes. In this work, we investigate Lake Azigza in the Moroccan Middle Atlas, a region that suffers from a scarcity of observational hydrological data necessary for a coherent management of water resources. Sedimentary deposits of Lake Azigza (32°58′N, 5°26′...
Conference Paper
Full-text available
Flujos de barro e inundaciones gatillados por eventos extremos de lluvia han generado terribles desastres en diversas localidades del Desierto de Atacama. Basados en el análisis de datos meteorológicos y crónicas del siglo XX, el estudio de sedimentos marinos de la Bahía de Tongoy (30°S), y modelos de simulación climática hemos evaluado los factore...
Poster
Full-text available
Adaptation of local populations to climate change over time is one of the main concerns of the PALEOMEX-MISTRALS program (INEE-INSU funding). This research project promotes new geoarchaeological and palaeoenvironmental studies on the Middle Atlas Mountains (Morocco - fig. 1). This area presents a high archaeological potential and numerous lacustrin...
Presentation
Full-text available
History of the sediment transports to the Sea by the Bouregreg basin in Morocco
Article
Full-text available
This study aims at establishing past variations of the main oceanographic and climatic features in the Central Chilean coast, using recent sedimentary records of a transitional semi-arid ecosystem susceptible to environmental forcing conditions. Coquimbo (30°S) region is characterized by dry summers and short rainfall periods during winter. The rel...
Article
Full-text available
Recent sedimentary and morphological changes at the new mouth of Medjerda-River (Gulf of Tunis) are investigated using a multiproxy approach of sediment cores complited by 210Pbex and 137Cs method dating. The subject of the study is to focus on surveying the sedimentary evolution of Medjerda-Raoued Delta caused by the human intervention in the mana...
Article
Full-text available
The sedimentary contributions of the Medjerda to the coastal zone are poorly measured, and there is no chronicle of observations. In this context, the sediment monitoring appears indispensable for the quantification of sediment transport at the outlet. This study focuses on the largest watershed in Tunisia, the Wadi Medjerda (23 600 km²). The main...
Article
Lagoonal systems are vulnerable environments in the present day context of global climate change. The study of their sedimentary infill is critical to understand marine and continental factors controlling their evolution, and in so doing, evaluate their future behaviour and potential management. In that context, Mediterranean lagoons are particular...
Chapter
A great number of rivers of North Africa are equipped with many dams for multiple purposes, mainly potable water, irrigation and energy production. In most of the countries—Morocco, Algeria and Tunisia, the storage capacity exceeds the runoff capacity, which means that water is stored several times in a row during its course to the sea.
Chapter
The Mediterranean is considered as one of the most vulnerable areas on the planet, a “Hotspot” of the global climate change (IPCC 2014).
Chapter
The Mediterranean region has experienced numerous extreme coastal events, such as flood events which caused casualties and economic damage.
Book
Full-text available
Shorelines are defined as an interface where natural, anthropogenic, socio-economic constraints are exacerbated and constantly changing.
Book
Full-text available
A great number of rivers of North Africa are equipped with many dams for multiple purposes, mainly potable water, irrigation and energy production. In most of the countries—Morocco, Algeria and Tunisia, the storage capacity exceeds the runoff capacity, which means that water is stored several times in a row during its course to the sea.
Book
Full-text available
The Mediterranean region has experienced numerous extreme coastal events, such as flood events which caused casualties and economic damage.
Book
The Mediterranean is considered as one of the most vulnerable areas on the planet, a “Hotspot” of the global climate change (IPCC 2014).
Chapter
Shorelines are defined as an interface where natural, anthropogenic, socio-economic constraints are exacerbated and constantly changing.
Article
The Mejerda River is the one of the major rivers in Tunisia and several studies dealt with the importance of this river in terms of ecology, geochemistry and sociology. However, the sedimentary contributions to the coastal zone from the Mejerda River were poorly observed, and we did not find any continuous monitoring. The main objective of this wor...
Article
Full-text available
Resurrection Ecology (RE) is a very powerful approach to address a wide range of question in ecology and evolution. This approach rests on using appropriate model systems, and only few are known to be available. In this paper, we show that Artemia has multiple attractive features (short generation time, cyst bank and collections, well documented ph...
Article
Full-text available
Climate models project that rising atmospheric carbon dioxide concentrations will increase the frequency and the severity of some extreme weather events. The flood events represent a major risk for populations and infrastructures settled on coastal lowlands. Recent studies of lagoon sediments have enhanced our knowledge on extreme hydrological even...
Article
The variability of fluvial activity in the Northwestern Mediterranean coastal lowlands and its relationship with modes of climate change were analysed from the late 9th to the 18th centuries CE. Geochemical analyses were undertaken from a lagoonal sequence and surrounding sediments in order to track the fluvial inputs into the lagoon. An index base...
Article
There is a growing interest for marine flooding related to recent catastrophic events and their unintended consequences in terms of casualties and damages, and to the increasing population and issues along the coasts in a context of changing climate. Consequently, the knowledge on marine flooding has progressed significantly for the last years and...
Conference Paper
Full-text available
En palynologie, l'étude des échantillons de surface est cruciale pour cerner les relations entre la pluie pollinique actuelle, la végétation et le climat. Les spectres de la pluie pollinique actuelle aident à l'interprétation des enregistrements polliniques fossiles, à la reconstruction des associations végétales et des paysages ainsi qu'à la recon...
Article
Pore water from short cores was analyzed for dissolved major, minor, and trace elements (Cl, Na, Mg, K, Ca, Sr, Si, B, P, Ba, Pb, Mn, Fe, Cd, U, and Mo), δ¹³DIC, sulfide, sulfate, and methane. The solid sediment fraction was likewise analyzed for total organic carbon (TOC), metals, and redox potential. Elevated sediment temperatures were found in s...
Article
Full-text available
Storms and tsunamis, which may seriously endanger human society, are amongst the most devastating marine catastrophes that can occur in coastal areas. Many such events are known and have been reported for the Mediterranean, a region where high-frequency occurrences of these extreme events coincides with some of the most densely populated coastal ar...
Article
Full-text available
Pollen and clay mineralogical analyses of a Holocene sequence from Sebkha Boujmel (southern Tunisia) trace the climatic and environmental dynamics in the lower arid bioclimatic zone over the last 8000 years. During the mid- to late Holocene transition, between ca. 8 and 3 ka BP, a succession of five wet–dry oscillations is recorded. An intense arid...
Article
Full-text available
Storms and tsunamis, which may seriously endanger human society, are amongst the most devastating marine catastrophes that can occur in coastal areas. Many such events are known and have been reported for the Mediterranean, a region where high-frequency occurrences of these extreme events coincides with some of the most densely populated coastal ar...
Article
Full-text available
The aim of this study is to reconstruct the impact of past environmental changes in the Moroccan Rif mountainous ecosystems. We collected an 8.5 m sedimentary core in the western part of the Rif and analyzed its palynological content, micro-remains of fossil charcoal, particle size, and content of several chemical elements. The chronology of the re...
Article
The Taiwan area, where the Philippine Sea Plate collides with Eurasia, is one of the most seismically active areas in the world and has been consequently struck repeatedly by destructive earthquakes. To better constrain the occurrence of large earthquakes, we have conducted two cruises in 2012 and 2013 from which five piston, gravity and box-cores...
Article
Full-text available
Climate models project that rising atmospheric carbon dioxide concentrations will increase the frequency and the severity of some extreme weather events. The floods events represent a major risk for populations and infrastructures settled on coastal lowlands. Recently, study of lagoon sediments contributed to enhance our knowledge on extreme hydrol...
Article
Full-text available
Taiwan is a young and seismically active mountain belt, where a series of strong earthquakes (M>7) have occurred over the past hundred years. Identifying historical earthquakes around Taiwan is a key to better constrain the geodynamic of this active region. Sedimentological and geochemical analyses of surface sediments from one station offshore eas...
Article
Full-text available
Pollen and clay mineralogical analyses of a Holocene sequence from Sebkha Boujmel (southern Tunisia) traces the climatic and environmental dynamics in the lower arid bioclimatic zone over the last 8000 years. During the Mid- to Late Holocene transition, between 8 and 3 ka, a succession of five wet/dry oscillations is recorded. An intense arid event...
Article
A new fossil record from the southern Middle Atlas spans continuously the last 25 000 years and provides evidence of an increased amount of snow precipitation during the last glacial period and a warm early Holocene with rather dry climate conditions. This environmental reconstruction is based on a multi-proxy approach that integrates pollen, micro...
Article
Taiwan is a young and seismically active mountain belt, where a series of strong earthquakes (M>7) have occurred over the past hundred years. Identifying historical earthquakes around Taiwan is a key to better constrain the geodynamic of this active region. Sedimentological and geochemical analyses of surface sediments from one station offshore eas...
Article
Full-text available
Holocene climate fluctuations and human activity since the Neolithic have shaped present-day Mediterranean environments. Separating anthropogenic effects from climatic impacts to better understand Mediterranean paleoenvironmental changes over the last millennia remains a challenging issue. High-resolution pollen analyses were undertaken on two core...
Article
We have discovered in a marine core, located 20. km east of the Coastal Range of Taiwan at the top of a 1200. m deep submarine high, sheltered from rivers discharges and gravitational flows, a 23. cm-thick anomalous sequence topped with broken bivalves and wood fragments. Based on radiocarbon dating, we distinguish five sub-events within ∼. 100. yr...
Conference Paper
Full-text available
Depuis les années 1990, le bassin méditerranéen subit une augmentation des événements de précipitation et de sécheresse extrêmes susceptibles de s’amplifier au cours du XXIe siècle, et dont l’origine est attribuable aux activités anthropiques depuis la révolution industrielle de 1850 (IPCC, 2013). Les résultats issus des modèles climatiques régiona...
Poster
Full-text available
En Tunisie méridionale, en l’absence de données paléo- et archéobotaniques, des taxons «reliques» sont considérées comme le témoignage de la présence d’une végétation xérophyte arborée détruite par l’impact anthropique durant la période Romaine et le Moyen-âge. Cette anthropisation aurait favorisé la mise en place des steppes pré-désertiques actuel...
Article
Full-text available
Holocene climate fluctuations and human activities since the Neolithic have shaped present-day Mediterranean environments. Separating anthropogenic effects from climatic impacts to reconstruct Mediterranean paleoenvironments over the last millennia remains a challenging issue. High resolution pollen analyses were undertaken on two cores from the Pa...