Laboratoire Morphodynamique Continentale et Côtière

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Nonlinear Wave and Pattern Dynamics

This book addresses the fascinating phenomena associated with nonlinear waves and spatio-temporal patterns. These appear almost everywhere in nature from sand bed forms to brain patterns, and yet their understanding still presents fundamental scientific challenges. The reader will learn here, in particular, about the current state-of-the art and new results in : · Nonlinear water waves : resonance, solitons, focusing, Bose-Einstein condensation, as well as and their relevance for the sea environment (sea-wind interaction, sand bed forms, fiber clustering) · Pattern formation in non-equilibrium media : soap films, chimera patterns in oscillating media, viscoelastic Couette-Taylor flow, flow in the wake behind a heated cylinder, other pattern formation. The editors and authors dedicate this book to the memory of Alexander Ezersky, Professor of Fluid Mechanics at the University of Caen Normandie (France) from September 2007 to July 2016. Before 2007, he had served as a Senior Scientist at the Institute of Applied Physics of the Russian Academy of Sciences in Nizhny Novgorod (Russia). The chapters have been written by leading scientists in Nonlinear Physics, and the topics chosen so as to cover all the fields to which Prof. Ezersky himself contributed, by means of experimental, theoretical and numerical approaches. The volume will appeal to advanced students and researchers studying nonlinear waves and pattern dynamics, as well as other scientists interested in their applications in various natural media.

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Relief et tectonique récente

Cet ouvrage ne dressera pas de manière exhaustive l’ensemble des formes structurales de la Terre. Il vise plutôt à l’étude des « couplages » entre la tectonique récente et la morphologie, à la fois dans les régions de limites de plaques (chaînes de montagne, rifts, zones transformantes, ...) et dans les régions intra-plaques à plus faibles vitesses de déformation. La démarche est de privilégier la présentation des méthodes et techniques ainsi que les résultats récents en morphotectonique (voir § 2). Cette étude géomorphostructurale intègre des observations d’ordres morphologiques, structurales et sédimentologiques. Une telle approche pluridisciplinaire exige le recours à des méthodes d’analyse propres à chacune de ces disciplines. Elle doit permettre d’étudier à différentes échelles spatio-temporelles et de façon diachronique l’ensemble des processus morpho-sédimentaires et tectoniques associés aux principaux évènements géodynamiques du globe terrestre (collision, rifting ...).

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The Seismoelectric Method : Theory and Application

Contents List 1. Background and History : This chapter will outline the basics of the technique with some general examples as well as a short history in both earth sciences and colloidal chemistry. 2. Macroscopic Equations : This chapter will cover the theory with the description of approaches based on the zeta potential and the excess of charge per unit pore volume. 3. Extension to Unsaturated and two-phase flow Conditions : Many applications of the seismoelectric method require an extension to the unsaturated case (vadose zone hydrogeology) and to two-phase flow conditions (oil and gas reservoirs). This chapter describes such an extension. 4. Applications : We will described few applications of the method including the characterization of water content in the vadose zone, the study of glaciers, the use of the seismoelectric method in the borehole environment and the study of fracking. 5. Electroacoustic with beamforming. This chapter will cover a recently developed extension of the seismoelectric method in which seismic beamforming is performed at any point of a reservoir and the record and analysis of the burst of the electrical field is performed remotely. This offers a new and exciting way to do tomography of the change in saturation during the production of a reservoir. 6. Appendices will include MATLAB scripts used for analysis and modeling, and data from the case studies.

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The Self-Potential Method : Theory and Applications in Environmental Geosciences

The self-potential method enables non-intrusive assessment and imaging of disturbances in electrical currents of conductive subsurface materials. It has an increasing number of applications, from mapping fluid flow in the subsurface of the Earth to detecting preferential flow paths in earth dams and embankments. This book provides the first full overview of the fundamental concepts of this method and its applications in the field. It discusses a historical perspective, laboratory investigations undertaken, the inverse problem and seismoelectric coupling, and concludes with the application of the self-potential method to geohazards, water resources and hydrothermal systems. Chapter exercises, online datasets and analytical software enable the reader to put the theory into practice. This book is a key reference for academic researchers and professionals working in the areas of geophysics, environmental science, hydrology and geotechnical engineering. It will also be valuable reading for related graduate courses.