Accéder directement au contenu

Laurent Dezileau

11
Documents

Présentation

**Spécialités** : Géochimie, radiochimie, géochronologie, sédimentologie, géomorphologie. **Thématiques** : Paléoclimatologie, paléohydrologie, paléotempestologie, paléoenvironnement, paléocéanographie. **Chantiers** : Maroc, Tunisie, Algérie, Taiwan, Chili, Espagne, France, Océan Austral, Océan Pacifique **Compétences analytiques et techniques** : Nomination Personne Compétente en Radioprotection (PCR) option sources scellées, appareils électriques émettant des rayons X et accélérateurs de particules ; Radiochimie (U,Th, Po). **Instruments et laboratoires** : Spectrométrie nucléaire, FluoX portable, granulométrie laser, laboratoire de radiochimie, laboratoire de sédimentologie/géochimie/granulométrie **Recherche actuelle: Paleotempestology, Paleohydrology (Paleomex)** In the context of future climate change, there is an increasing concern that extreme climatic events may be changing in frequency and intensity. Storms and floods have been for long a threat for the western Mediterranean coast even if their link with climate variability is still misunderstood. This is in partly due to the fact that extreme events are inherently rare and difficult to observe in the period of a human life and to the lack of long-term observations or paleo-reconstructions. Understanding causes of their occurrence both in past and present climate, i.e. under different forcings, is an crucial issue for future predictions considering the growing number of people living in the coastal Mediterranean in high-risk areas and therefore enhanced exposure. Natural systems are highly sensitive to intense climate episodes but impact assessment strongly depends on the resiliency and capability for adaptation and mitigation of each system. In order to place such events in the broader context of climate change, it is essential to document their occurrence, both in space and time, over period of several centuries or millennium. One of the PALEOMEX projects intend to combine paleo-data and model simulations to (i) document the occurrence of extreme events (floods and storms) that have impacted the western Mediterranean coastal region during the last millennium, high resolution bio- and geo-proxies will be compared with historical sources in order to illustrate, quantify, date and test the reliability and frequency of past disastrous events, (ii) investigate the relationship between these events and climate variability and trends (iii) cross-compare reconstructed climatic series to simulations realized on the coupled climatic models (ARPEGE-NEMO, IPSL) in order to answer the fundamental scientific questions : Are the mechanisms triggering those extreme events governed by internal feedbacks of the climate system ? Which ones ?, What will be the climate variability in the Mediterranean basin ?, What kind of change the region will be the most vulnerable to (trend and / or extreme events) ?, and to develop future scenarios simulations to tentatively assess the extreme floods and storms probabilities in the future. We will focus on the western Mediterranean coastal region (i.e. Morocco, Algeria, Tunisia, Spain and France) that are particularly sensitive to erosion/submersion during storm events and have societal issues in terms of flood risks.

Publications

gil-mahe
"gil-mahe"
Image document

Human Impact on the Morpho-Sedimentary Evolution on the Coastal Deltaic Zones (Case of Application: Artificial Canal of Medjerda River, Tunisa)

Thouraya Benmoussa , Oula Amrouni , Abderraouf Hzami , Laurent Dezileau , Gil Mahe
Kallel A.; Ksibi M.; Ben Dhia H.; Khélifi N. Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions. EMCEI, Springer, pp.1701-1703, 2018, ⟨10.1007/978-3-319-70548-4_495⟩
Chapitre d'ouvrage hal-01861460v1
Image document

Assessment of the Impact of Dams on River Regimes, Sediment Transports to the Sea, and Coastal Changes

Gil Mahe , Oula Amrouni , Thouraya Ben Moussa , Laurent Dezileau , Rajae El Aoula
Kallel A.; Ksibi M.; Ben Dhia H.; Khélifi N. Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions. EMCEI, Springer, pp.31-32, 2018, ⟨10.1007/978-3-319-70548-4_12⟩
Chapitre d'ouvrage hal-01861450v1

Impact of climate change and river managements on the reduction of sediment transport to the sea in Maghreb

Gil Mahe , O. Amrouni , T. Ben Moussa , Lassad Chouba , Laurent Dezileau
3rd International Conference on the Hydrology of African large river basins. FRIEND/UNESCO/IHP-IAHS, May 2018, Alger, Algeria
Communication dans un congrès hal-02441140v1

Impact of the Medjerda sedimentary fluxes on the morphodynamicequilibrium of the northern coast of the Gulf of Tunis (Medjerda-Raouedcoast).

Thouraya Ben Moussa , Oula Amrouni , Laurent Dezileau , Gil Mahe , Saadi Abdeljaouad
IAHS 2017 Scientific Assembly, Jul 2017, Port Elizabeth, South Africa
Communication dans un congrès hal-02104170v1

The impact of dams on the reduction of the sediment transports to the sea from core sample study in the Wadi Medjerda low valley.

Fatma Kotti , Gil Mahe , Laurent Dezileau , Hamadi Habaieb , Malik Bentkaya
IAHS 2017 Scientific Assembly, Jul 2017, Port Elizabeth, South Africa
Communication dans un congrès hal-02104180v1

Fresh water and sediment discharges variability to the coasts of Maghreb: the impact of climate change and anthropogenic activities on coastal environments

Gil Mahe , A. Saadi , O. Amrouni , T. Benmoussa , Laurent Dezileau
2ème Conférence Internationale sur l’hydrologie des grands bassins Fluviaux d’Afrique- FRIEND/ISI/IAHS, Nov 2016, Dakar, Sénégal
Communication dans un congrès hal-02121697v1

Reconstitution historique des apports sédimentaires par l'oued Medjerda, Tunisie

Fatma Kotti , Laurent Dezileau , Gil Mahe , Hamadi Habaieb , Malik Bentkaya
Deuxième journée des doctorants de l’IM2E, Mar 2016, Montpellier, France
Poster de conférence hal-02127688v1