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Author: Marc Honnorat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 144
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Book Description
Ce travail porte sur l'assimilation variationnelle de données lagrangiennes en hydraulique fluviale, pour l'identification de paramètres dans un modèle numérique de rivière basé sur les équations de Saint-Venant, mise oeuvre dans le logiciel Dassflow. Nous proposons de prendre en compte des observations de nature Lagrangienne, comme des trajectoires de particules transportées à la surface de l'écoulement, en plus des observations classiquement disponibles, parfois insuffisantes. L'intérêt de cette approche pour améliorer l'identification de certains paramètres est mis en évidence à travers une série d'expériences numériques utilisant soit des données synthétiques, soit des données réelles issues d'un écoulement en canal, où des trajectoires sont extraites d'une séquence vidéo.
Author: Marc Honnorat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 144
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Book Description
Ce travail porte sur l'assimilation variationnelle de données lagrangiennes en hydraulique fluviale, pour l'identification de paramètres dans un modèle numérique de rivière basé sur les équations de Saint-Venant, mise oeuvre dans le logiciel Dassflow. Nous proposons de prendre en compte des observations de nature Lagrangienne, comme des trajectoires de particules transportées à la surface de l'écoulement, en plus des observations classiquement disponibles, parfois insuffisantes. L'intérêt de cette approche pour améliorer l'identification de certains paramètres est mis en évidence à travers une série d'expériences numériques utilisant soit des données synthétiques, soit des données réelles issues d'un écoulement en canal, où des trajectoires sont extraites d'une séquence vidéo.
Author: Hélène Roux
Publisher:
ISBN:
Category :
Languages : fr
Pages : 275
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Book Description
@Depuis ses débuts, la télédétection a considérablement contribué à la progression des recherches dans le domaine de l'hydrodynamique des crues. Les nouvelles générations de satellites sont à présent en mesure de fournir des observations qui, dans un contexte général de manque de données, peuvent être valorisées. En effet, la modélisation numérique en hydraulique fait intervenir un certain nombre de paramètres qu'il est difficile d'ajuster en pratique, ce qui entraîne de délicats problèmes de calage de ces paramètres et validation du modèle. L'objectif de ce travail est de tester la possibilité de pallier la manque d'information auquel se heurte la modélisation hydraulique, notamment par l'intégration de données issues de la télédétection, en s'appropriant des techniques d'assimilation de données. L'originalité de l'étude est de traiter des vues de dessus de la rivière montrant l'extension des eaux afin de reconstituer les paramètres nécessaires à la simulation de l'écoulement tels que le débit, le coefficient de Strickler ou bien les caractéristiques géométriques du cours d'eau. Différentes techniques d'assimilationde données sont appliquées dans le cadre d'expériences jumelles, afin de déterminer les méthodes les plus adaptées à l'objectif visé. La méthode choisie est ensuite testée sur deux sites d'étude. Des travaux de transfert de calibration, une analyse de sensibilité et un calcul d'incertitude sur l'étendue de la zone inondée, simulée à partir des paramètres estimés, viennent compléter l'étude.
Author: Cyril Mazauric
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Author: Cyril Mazauric
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: Jean-Michel Tanguy
Publisher:
ISBN: 9782746223370
Category :
Languages : fr
Pages : 191
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Book Description
Author: Y.A. Kontar
Publisher: Springer Science & Business Media
ISBN: 9400772696
Category : Nature
Languages : en
Pages : 472
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Book Description
This book is a collective effort by world experts, bringing together assorted contributions presented during the Ocean Science Session OS-017, of the AOGS-AGU Joint Assembly held in Singapore in 2012 (the Asia Tsunami and Great East Japan Earthquake and Tsunami events). The chapters cover assessment, evaluation, forecast and lessons learned as well as environmental and societal impacts of the latest tsunamis that occurred in the Indian Ocean in 2004 and the Pacific Ocean in Japan 2011. The book is aimed at experts, scientists and decision makers seeking recent updated information, knowledge and experiences to better understand, quantify, forecast and protect coastal water resources, ecosystems, communities and human settlements which are often affected by tsunamis.
Author: E. F. Toro
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 336
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Book Description
The first of its kind in the field, this title examines the use of modern, shock-capturing finite volume numerical methods, in the solution of partial differential equations associated with free-surface flows, which satisfy the shallow-water type assumption (including shallow water flows, dense gases and mixtures of materials as special samples). Starting with a general presentation of the governing equations for free-surface shallow flows and a discussion of their physical applicability, the book goes on to analyse the mathematical properties of the equations, in preparation for the presentation of the exact solution of the Riemann problem for wet and dry beds. After a general introduction to the finite volume approach, several chapters are then devoted to describing a variety of modern shock-capturing finite volume numerical methods, including Godunov methods of the upwind and centred type. Approximate Riemann solvers following various approaches are studied in detail as is their use in the Godunov approach for constructing low and high-order upwind TVD methods. Centred TVD schemes are also presented. Two chapters are then devoted to practical applications. The book finishes with an overview of potential practical applications of the methods studied, along with appropriate reference to sources of further information. Features include: * Algorithmic and practical presentation of the methods * Practical applications such as dam-break modelling and the study of bore reflection patterns in two space dimensions * Sample computer programs and accompanying numerical software (details available at www.numeritek.com) The book is suitable for teaching postgraduate students of civil, mechanical, hydraulic and environmental engineering, meteorology, oceanography, fluid mechanics and applied mathematics. Selected portions of the material may also be useful in teaching final year undergraduate students in the above disciplines. The contents will also be of interest to research scientists and engineers in academia and research and consultancy laboratories.
Author: David Russo
Publisher: Springer Science & Business Media
ISBN: 3642779476
Category : Technology & Engineering
Languages : en
Pages : 323
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Book Description
A year has passed since Eshel Bresler, my good friend and colleague, and a member of the editorial board of the Advanced Series in Agricultural Sciences, died suddenly while on a visit to the Chinese Academy of Sciences in Beijing. We had worked together for almost 30 years at the Institute of Soils and Water, ARO, The Volcani Center at Bet Dagan. At the very beginning of our scientific careers we cooperated directly and as a result one of our first publications was coauthored (Soil Sci. 101:205-209, 1966). Thereafter, our specific research interests diver sified, but we continued to work together, with similar approaches to research, and to strive towards the development of Israel soil science and its integration into general worldwide scientific progress. I don't need to emphasize Eshel's contribution to the understan ding of the processes governing water flow and solute transport pro cesses in soils and unsaturated zones. The contributions to this Volume by such a body of outstanding scientists shows the apprecia tion of the international scientific community to his research achievements.
Author: Javier Alvarez-Benedi
Publisher: CRC Press
ISBN: 9780367393359
Category :
Languages : en
Pages : 816
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Book Description
The practitioner or researcher often faces complex alternatives when selecting a method to characterize properties governing a soil process. After years of research and development, environmental and agricultural professionals now have an array of methods for characterizing soil processes. Well-established methods, however, may not be suitable for the specific conditions of a study since many soil characteristics are intrinsically variable. An objective, integrated approach for soil characterization is needed to more effectively quantify parameters. Soil-Water-Solute Process Characterization goes beyond technical guidance and addresses the complicating factors such as spatial and temporal variability of soil processes, scale issues, soil structure, and the trade-offs between methods. It focuses on advanced methods for the monitoring and modeling of mass transfer processes in soil. Expert contributors present limitations to well-known methods and alternatives, discussing their practical applications for characterization efforts, evaluating strengths and weaknesses, and focusing on a reduced set of selected techniques. Three in-depth sections cover everything from multidisciplinary approaches for assessing subsurface non-point source pollution to techniques for characterizing water and energy balances at the soil-plant-atmosphere interface, field methods for monitoring soil water status, and computer models for characterizing the effect of chemicals in soil. This single-source reference is transforming method selection and our understanding of the principles, advantages, and limitations of the available monitoring techniques. Written in a simple and straightforward manner, Soil-Water-Solute Process Characterization is a detailed cookbook and a useful, practical reference for students, practitioners, and researchers.
Author: Idris Assani
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110460912
Category : Mathematics
Languages : en
Pages : 170
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Book Description
This monograph discusses recent advances in ergodic theory and dynamical systems. As a mixture of survey papers of active research areas and original research papers, this volume attracts young and senior researchers alike. Contents: Duality of the almost periodic and proximal relations Limit directions of a vector cocycle, remarks and examples Optimal norm approximation in ergodic theory The iterated Prisoner’s Dilemma: good strategies and their dynamics Lyapunov exponents for conservative twisting dynamics: a survey Takens’ embedding theorem with a continuous observable
