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Operational monitoring of gravitational movements with image time series / Mathilde Desrues (2021)  

Public Titre : Operational monitoring of gravitational movements with image time series Titre original : Surveillance opérationnelle de mouvements gravitaires par séries temporelles d’images Type de document : Thèse/HDR Auteurs : Mathilde Desrues, Auteur ; Jean-Philippe Malet, Directeur de thèse Editeur : Strasbourg : Université de Strasbourg Année de publication : 2021 Importance : 231 p. Format : 21 x 30 cm Note générale : Bibliographie Thèse présentée en vue de l’obtention du grade en Géosciences - Géophysique de Docteur de l’Université de Strasbourg Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse diachronique [Termes IGN] données géologiques [Termes IGN] effondrement de terrain [Termes IGN] état de l'art [Termes IGN] Hautes-Alpes (05) [Termes IGN] image RVB [Termes IGN] image terrestre [Termes IGN] Isère (38) [Termes IGN] modèle stéréoscopique [Termes IGN] prise de vues en accéléré [Termes IGN] risque naturel [Termes IGN] Savoie (73) [Termes IGN] série temporelle [Termes IGN] structure géologique [Termes IGN] surveillance géologique Index. décimale : THESE Thèses et HDR Résumé : (Auteur) Understanding the dynamics and the behavior of gravitational slope movements is essential to anticipate catastrophic failures and thus to protect lives and infrastructures. Several geodetic techniques already bring some information on the displacement / deformation fields of the unstable slopes. These techniques allow the analysis of the geometrical properties of the moving masses and of the mechanical behavior of the slopes. By combining time series of passive terrestrial imagery and these classical techniques, the amount of collected information is densified and spatially distributed. Digital passive sensors are increasingly used for the detection and the monitoring of gravitational motion. They provide both qualitative information, such as the detection of surface changes, and a quantitative characterization, such as the quantification of the soil displacement by correlation techniques. Our approach consists in analyzing time series of terrestrial images from either a single fixed camera or pair-wise cameras, the latter to obtain redundant and additional information. The time series are processed to detect the areas in which the Kinematic behavior is homogeneous. The slope properties, such as the sliding volume and the thickness of the moving mass, are part of the analysis results to obtain an overview which is as complete as possible. This work is presented around the analysis of four landslides located in the French Alps. It is part of a CIFRE/ANRT agreement between the SAGE Society - Société Alpine de Géotechnique (Gières, France) and the IPGS - Institut de Physique du Globe de Strasbourg / CNRS UMR 7516 (Strasbourg, France). Note de contenu : 1. Remote sensing methods for the monitoring of gravitational movements 1.1 Gravitational movements: risk and challenges 1.2 Landslide monitoring: in-situ measurements and remote sensing 1.3 Time-lapse photography 1.4 Presentation of the use cases: technologies and data Conclusions 2. Image time series analysis for a monoscopic model 2.1 Introduction 2.2 Methodology 2.3 Combination strategies for processing large image datasets 2.4 Application to use cases: the Chambon and the Pas de l’Ours landslides 2.5 Sensitivity analysis 2.6 Results and Discussion 2.7 Advantages and Limitations of TSM Pipeline Conclusions 3. A stereoscopic model for landslide analysis: Application to the Montgombert landslide (Savoie, French Alps) 3.1 Foreword 3.2 Stereoscopic model 3.3 Landslide displacement estimation 3.4 Landslide deformation estimation Conclusions 4. Pre- and post-event monitoring analysis: application to the Cliets rockslide (Savoie, French Alps) 4.1 Case study in the context of monitoring and early-warning 4.2 Time-lapse image analysis Conclusions 5. Conclusions and perspectives 5.1 General conclusions 5.2 Perspectives A Caractéristiques des caméras II B Analyse de sensibilité des paramétres externes sur les résultats de TSM VII C Série temporelle des déplacements détéctés post événement - glissement des Cliets Numéro de notice : 26767 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de Doctorat : Géosciences - Géophysique : Strasbourg : 2021 Organisme de stage : Institut de physique du globe de Strasbourg IPGS nature-HAL : Thèse DOI : sans Date de publication en ligne : 13/10/2021 En ligne : https://tel.archives-ouvertes.fr/tel-03376927/document Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99864