105 research outputs found

    Littoral à risque: méthodes d'évaluation des risques multiples

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    International audienceIn recent years the interest for coastal hazards has increased significantly due to extreme events, sometimes related to climate change, that frequently occur in different parts of the world, often inducing high risk situations. This paper outlines the objectives, perspectives and preliminary results of a research project entitled “Coastline at risk: Methods for multi-hazard assessment” which aims at providing useful knowledge for the mitigation of coastal instability. The project is managed by the European Centre on Geomorphological Hazards (Centre EuropĂ©en sur les Risques Geomorphologiques, CERG) and funded by the EUR-OPA Major Hazards Agreement. Investigations are focused on coastal landslides in three different morpho-climatic European environments: Malta (Mediterranean coastline), Lower Normandy (Channel coastline) and Central Portugal (Atlantic coastline). The research outputs are expected to provide a significant opportunity for scientific discussion based on the comparison of data regarding instability situations in the context of multi-hazards assessment. The latter has until now dealt slightly with the coasts of Malta, Normandy and Portugal on which the investigations will be focused, despite significant risk issues present there, as evidenced from a series of accidents and damages recorded after landslide events. The aims of the project will be pursued through multidisciplinary investigations which foresee geomorphological and engineering-geological approaches. Integrated avant-garde research techniques, both traditional and innovative, will be applied with special reference to mapping, monitoring and modelling of coastal instability phenomena. The final objective is to propose a method for coastal multi-hazard assessment that can be used to face and manage coastal hazards.Au cours des derniĂšres annĂ©es, l'intĂ©rĂȘt pour les risques cĂŽtiers a augmentĂ© de maniĂšre significative en raison d'Ă©vĂ©nements extrĂȘmes, parfois liĂ©s au changement climatique, qui se produisent frĂ©quemment dans diffĂ©rentes parties du monde, induisant souvent des situations Ă  haut risque. Le prĂ©sent document dĂ©crit les objectifs, les perspectives et les rĂ©sultats prĂ©liminaires d'un projet de recherche intitulĂ© "Littoral en danger: MĂ©thodes d'Ă©valuation multi-dangers" qui vise Ă  fournir des connaissances utiles Ă  l'attĂ©nuation de l'instabilitĂ© cĂŽtiĂšre. Le projet est gĂ©rĂ© par le Centre europĂ©en sur les risques gĂ©omorphologiques (Centre EuropĂ©en sur les Risques Geomorphologiques, CERG) et financĂ© par l'Accord sur les risques majeurs EUR-OPA. Les enquĂȘtes sont axĂ©es sur les glissements de terrain cĂŽtiers en trois morpho-climatiques environnements europĂ©ens diffĂ©rents: Malte (cĂŽte mĂ©diterranĂ©enne), Basse-Normandie (cĂŽte de la Manche) et le Portugal (Central cĂŽte atlantique). Les rĂ©sultats de la recherche sont censĂ©s fournir une occasion importante de discussion scientifique basĂ©e sur la comparaison des donnĂ©es concernant les situations d'instabilitĂ© dans le contexte de l'Ă©valuation multi-risques. Ce dernier a jusqu'Ă  prĂ©sent traitĂ© lĂ©gĂšrement avec les cĂŽtes de Malte, de la Normandie et au Portugal oĂč les enquĂȘtes seront axĂ©s, en dĂ©pit des problĂšmes importants de risque prĂ©sents lĂ -bas, comme en tĂ©moigne une sĂ©rie d'accidents et de dommages enregistrĂ©es aprĂšs des glissements de terrain. Les objectifs du projet seront poursuivis Ă  travers des enquĂȘtes multidisciplinaires qui prĂ©voient des approches gĂ©omorphologiques et gĂ©otechniques. Techniques de recherche d'avant-garde intĂ©grĂ©s, Ă  la fois traditionnels et innovants, seront appliquĂ©es avec une rĂ©fĂ©rence particuliĂšre Ă  la cartographie, la surveillance et la modĂ©lisation des phĂ©nomĂšnes d'instabilitĂ© cĂŽtiĂšres. L'objectif final est de proposer une mĂ©thode d'Ă©valuation multi-risques cĂŽtiers qui peut ĂȘtre utilisĂ© pour faire face et gĂ©rer les risques cĂŽtiers

    Identification of hydro-meteorological triggers for Villerville coastal landslide

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    Ground-penetrating radar observations for estimating the vertical displacement of rotational landslides

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    The objective of this paper is to demonstrate the applicability of ground-penetrating radar (GPR) for monitoring the displacement of slow-moving landslides. GPR data are used to estimate the vertical movement of rotational slides in combination with other surveying techniques. The study area is located along the Normandy coast (northeast France) where several rotational landslides are continuously affected by a seasonal kinematic regime (low displacement rates of 0.01 to 0.10 m yr<sup>−1</sup>) and periodically by major acceleration events (high displacement rates of 1.0 to 7.0 m per event)
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