HAL (Le Centre pour la Communication Scientifique Directe), 2016
Data assimilation is an approach that combines observations and model output, with the objective ... more Data assimilation is an approach that combines observations and model output, with the objective of improving the latter. This book places data assimilation into the broader context of inverse problems and the theory, methods, and algorithms that are used for their solution. It provides a framework for, and insight into, the inverse problem nature of data assimilation, emphasizing “why” and not just “how.” Methods and diagnostics are emphasized, enabling readers to readily apply them to their own field of study. Readers will find a comprehensive guide that is accessible to nonexperts; numerous examples and diverse applications from a broad range of domains, including geophysics and geophysical flows, environmental acoustics, medical imaging, mechanical and biomedical engineering, economics and finance, and traffic control and urban planning; and the latest methods for advanced data assimilation, combining variational and statistical approaches.
Abstract Adjoint-based methods have been successfully applied by us to a number of inverse proble... more Abstract Adjoint-based methods have been successfully applied by us to a number of inverse problems in shallow-water geoacoustics and acoustic tomography. These inversions were all performed in a range-independent context, using a finite-difference formulation of the wide-angle parabolic equation. In this study we consider realistic, fully range-dependent cases, where the bathymetry is variable and, more importantly, the medium properties (sound speed, density, attenuation) are variable in depth and range and can exhibit ...
DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de r... more DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de référencementde la production scientifique de l'ULB.L'interface de recherche DI-fusion permet de consulter les publications des chercheurs de l'ULB et les thèses qui y ont été défendues.
Description/Abstract The author studies analytically and numerically a transport equation arising... more Description/Abstract The author studies analytically and numerically a transport equation arising from acoustic wave propagation due to a point source in a randomly layered half space. Random material properties whose fluctuations are not restricted in magnitude, but are on a specific length scale are included in the acoustic equations. Analysis of the resulting stochastic differential equations by asymptotic methods lead to the derivation of a transport equation which describes the moments of the reflected pressure field. This ...
Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek &amp... more Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in Vlaanderen.
HAL (Le Centre pour la Communication Scientifique Directe), 2016
Data assimilation is an approach that combines observations and model output, with the objective ... more Data assimilation is an approach that combines observations and model output, with the objective of improving the latter. This book places data assimilation into the broader context of inverse problems and the theory, methods, and algorithms that are used for their solution. It provides a framework for, and insight into, the inverse problem nature of data assimilation, emphasizing “why” and not just “how.” Methods and diagnostics are emphasized, enabling readers to readily apply them to their own field of study. Readers will find a comprehensive guide that is accessible to nonexperts; numerous examples and diverse applications from a broad range of domains, including geophysics and geophysical flows, environmental acoustics, medical imaging, mechanical and biomedical engineering, economics and finance, and traffic control and urban planning; and the latest methods for advanced data assimilation, combining variational and statistical approaches.
Abstract Adjoint-based methods have been successfully applied by us to a number of inverse proble... more Abstract Adjoint-based methods have been successfully applied by us to a number of inverse problems in shallow-water geoacoustics and acoustic tomography. These inversions were all performed in a range-independent context, using a finite-difference formulation of the wide-angle parabolic equation. In this study we consider realistic, fully range-dependent cases, where the bathymetry is variable and, more importantly, the medium properties (sound speed, density, attenuation) are variable in depth and range and can exhibit ...
DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de r... more DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de référencementde la production scientifique de l'ULB.L'interface de recherche DI-fusion permet de consulter les publications des chercheurs de l'ULB et les thèses qui y ont été défendues.
Description/Abstract The author studies analytically and numerically a transport equation arising... more Description/Abstract The author studies analytically and numerically a transport equation arising from acoustic wave propagation due to a point source in a randomly layered half space. Random material properties whose fluctuations are not restricted in magnitude, but are on a specific length scale are included in the acoustic equations. Analysis of the resulting stochastic differential equations by asymptotic methods lead to the derivation of a transport equation which describes the moments of the reflected pressure field. This ...
Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek &amp... more Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in Vlaanderen.
Uploads