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Author: Dominique Faure
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
LE PREMIER CHAPITRE REALISE UNE SYNTHESE DES DONNEES RECUEILLIES PENDANT L'EXPERIENCE CEVENNES 86-87. IL PRECISE EGALEMENT LE PRETRAITEMENT REALISE SUR LES IMAGES RECUEILLIES PAR LE RADAR ANATOL EN UTILISANT UNIQUEMENT L'INFORMATION CONTENUE DANS CES IMAGES ET UN MODELE NUMERIQUE DE TERRAIN. DANS LE CHAPITRE II, LES MESURES D'UN DISDROMETRE PERMETTENT DE DETERMINER UNE RELATION Z-R ADAPTEE AUX EVENEMENTS PLUVIEUX, ET LES MESURES PLUVIOMETRIQUES SONT UTILISEES POUR CORRIGER LE MAUVAIS ETALONNAGE ELECTRONIQUE DU RADAR. LE CHAPITRE III CONCERNE L'ESTIMATION DE LAMES D'EAU HORAIRES DE REFERENCE, PAR KRIGEAGE SIMPLE DES MESURES D'UN RESEAU DE PLUVIOMETRES. UNE ATTENTION PARTICULIERE EST PORTEE A LA DETERMINATION DES CARACTERISTIQUES STATISTIQUES DES ERREURS D'ESTIMATIONS DE CES LAMES D'EAU. LES ESTIMATIONS DE LAMES D'EAU PAR RADAR SONT ENSUITE COMPAREES AUX VALEURS DE REFERENCE POUR DE PETITS BASSINS VERSANTS CEVENOLS (CHAPITRE IV). LES VARIATIONS DANS LE TEMPS, ET ENTRE BASSINS, DES RAPPORTS ENTRE CES LAMES D'EAU SONT ANALYSEES. LA PART DES VARIATIONS ATTRIBUABLES AUX LIMITES DU CRITERE DE COMPARAISON (LES RAPPORTS) ET AUX ERREURS D'ESTIMATIONS DES LAMES D'EAU DE REFERENCE EST TOUT D'ABORD DETERMINEE. LES PRINCIPALES SOURCES D'ERREURS DE LA MESURE RADAR INTERVENANT DANS CES VARIATIONS SONT ENSUITE IDENTIFIEES. FINALEMENT, L'APPORT D'UNE PRISE EN COMPTE DE PROFILS VERTICAUX DE REFLECTIVITE HORAIRES LORS DU PRETRAITEMENT DES IMAGES RADAR, ET L'UTILISATION DE MESURES DE REFLECTIVITE DIFFERENTIELLE, SONT QUANTIFIES (CHAPITRE V).
Author: Dominique Faure
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
LE PREMIER CHAPITRE REALISE UNE SYNTHESE DES DONNEES RECUEILLIES PENDANT L'EXPERIENCE CEVENNES 86-87. IL PRECISE EGALEMENT LE PRETRAITEMENT REALISE SUR LES IMAGES RECUEILLIES PAR LE RADAR ANATOL EN UTILISANT UNIQUEMENT L'INFORMATION CONTENUE DANS CES IMAGES ET UN MODELE NUMERIQUE DE TERRAIN. DANS LE CHAPITRE II, LES MESURES D'UN DISDROMETRE PERMETTENT DE DETERMINER UNE RELATION Z-R ADAPTEE AUX EVENEMENTS PLUVIEUX, ET LES MESURES PLUVIOMETRIQUES SONT UTILISEES POUR CORRIGER LE MAUVAIS ETALONNAGE ELECTRONIQUE DU RADAR. LE CHAPITRE III CONCERNE L'ESTIMATION DE LAMES D'EAU HORAIRES DE REFERENCE, PAR KRIGEAGE SIMPLE DES MESURES D'UN RESEAU DE PLUVIOMETRES. UNE ATTENTION PARTICULIERE EST PORTEE A LA DETERMINATION DES CARACTERISTIQUES STATISTIQUES DES ERREURS D'ESTIMATIONS DE CES LAMES D'EAU. LES ESTIMATIONS DE LAMES D'EAU PAR RADAR SONT ENSUITE COMPAREES AUX VALEURS DE REFERENCE POUR DE PETITS BASSINS VERSANTS CEVENOLS (CHAPITRE IV). LES VARIATIONS DANS LE TEMPS, ET ENTRE BASSINS, DES RAPPORTS ENTRE CES LAMES D'EAU SONT ANALYSEES. LA PART DES VARIATIONS ATTRIBUABLES AUX LIMITES DU CRITERE DE COMPARAISON (LES RAPPORTS) ET AUX ERREURS D'ESTIMATIONS DES LAMES D'EAU DE REFERENCE EST TOUT D'ABORD DETERMINEE. LES PRINCIPALES SOURCES D'ERREURS DE LA MESURE RADAR INTERVENANT DANS CES VARIATIONS SONT ENSUITE IDENTIFIEES. FINALEMENT, L'APPORT D'UNE PRISE EN COMPTE DE PROFILS VERTICAUX DE REFLECTIVITE HORAIRES LORS DU PRETRAITEMENT DES IMAGES RADAR, ET L'UTILISATION DE MESURES DE REFLECTIVITE DIFFERENTIELLE, SONT QUANTIFIES (CHAPITRE V).
Author: C. G. Collier
Publisher:
ISBN:
Category : Nature
Languages : en
Pages : 428
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Book Description
A guide to the ways in which radar is used to address practical problems in meteorology, hydrology, and the environmental sciences, this book supplies sufficient theory to explain how radars function. The emphasis is on the characteristics of the data obtained from radar and how this data can aid an understanding of specific real life applications. Applications include the accurate forecasting of rainfall and other severe weather, the use of radar data as an input for forecasting models, the understanding of the problems of airborne pollution, and how to specify and install radar systems at remote sites.
Author: I. D. Cluckie
Publisher: Ellis Horwood
ISBN:
Category : Radar in hydrology
Languages : en
Pages : 652
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Book Description
Author: Yasuto Tachikawa
Publisher:
ISBN: 9781901502374
Category : Hydrologic models
Languages : en
Pages : 340
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Book Description
Author: Thierry Pellarin
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
L'utilisation du radar météorologique pour des applications hydrologiques est encore assez peu répandue. Si l'aspect qualitatif de la mesure radar représente un atout pour l'hydrologie, la mesure quantitative des précipitations bute en revanche sur l'existence de nombreuses sources d'erreurs inhérente à la physique de la mesure radar. En régions montagneuses, le relief constitue une limitation évidente de l'utilisation de cet appareil et le site d'implantation ainsi que le choix du protocole d'exploration apparaissent déterminants dans la qualité des mesures radar. Un objectif de ce travail consiste à prédéterminer la qualité de couverture d'un radar météorologique sur une région donnée. L'influence de trois sources d'erreurs prépondérantes de la mesure radar est modélisée permettant de quantifier et de visualiser la distribution spatiale des erreurs commises sur les intensités pluvieuses. L'intégration de ces cartes d'erreurs simulées dans un modèle hydrologique permet d'observer la répercussion sur la reconstitution des débits à l'exutoire d'un bassin versant de l'Ardèche (Vogué, 640kms2). Une évaluation de la qualité de mesure de deux radars du réseau ARAMIS de Météo France est proposée ainsi qu'une analyse des besoins en terme de corrections.Une partie de ce travail consiste par ailleurs à tirer parti de la présence d'échos de sol pour tester la stabilité temporelle de l'étalonnage électronique d'un radar en analysant le signal rétrodiffusé par un relief.
Author: Yang Hong
Publisher: CRC Press
ISBN: 1466514620
Category : Science
Languages : en
Pages : 176
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Book Description
Radar Hydrology: Principles, Models, and Applications provides graduate students, operational forecasters, and researchers with a theoretical framework and practical knowledge of radar precipitation estimation. The only text on the market solely devoted to radar hydrology, this comprehensive reference: Begins with a brief introduction to radar Focuses on the processing of radar data to arrive at accurate estimates of rainfall Addresses advanced radar sensing principles and applications Covers radar technologies for observing each component of the hydrologic cycle Examines state-of-the-art hydrologic models and their inputs, parameters, state variables, calibration procedures, and outputs Discusses contemporary approaches in data assimilation Concludes with methods, case studies, and prediction system design Includes downloadable MATLAB® content Flooding is the #1 weather-related natural disaster worldwide. Radar Hydrology: Principles, Models, and Applications aids in understanding the physical systems and detection tools, as well as designing prediction systems.
Author: D.H. Newsome
Publisher: Springer Science & Business Media
ISBN: 9401127026
Category : Science
Languages : en
Pages : 268
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Book Description
Over the past twenty years, there has been a rapid expansion in the number of opera tional, digital weather radars in Europe. Work within COST 73 stimulated the use of data from these radars and also demonstrated the potential of the international exchange of weather radar data in near real-time. The Management Committee of the COST 73 Project have laid the foun dations upon which future international operational radar networking may be built in Europe, and has indicated the directions that future weather radar technological developments might take. Throughout this five year Project, it has been possible to achieve success o~ through the goodwill of the participants. The considerable international co-operation is, in no smaIl measure, the underpinning reason why the Management Committee of COST 73 have been able to address such a wide range of topics within the general category of international weather radar networking. It has been an honour to have had the opportunity to act as Chairman of a group of meteorolo gists, engineers and managers possessing such a wide variety of talents and experience. I would like to take this opportunity to thank them all for their many and varied contributions.
Author: C.G. Collier
Publisher: Springer Science & Business Media
ISBN: 9401124043
Category : Science
Languages : en
Pages : 323
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Book Description
International Weather Radar Networking covers all aspects of the subject in a collection of contributions drawn from all over the world. Of particular interest are the papers describing work in Eastern Europe and papers reviewing of the achievements of the Commission of the European Communities COST-73 project. During the last twenty years there has been a rapid growth in the number of digital radars deployed for operational use in Western Europe. There are now around 100, of which about half have a Doppler capability, providing wind as well as reflectivity information. The international exchange of the data from these systems promises a great enhancement of the benefits to weather forecasting and commercial users. This volume reports work being undertaken to realize those benefits and points the way to future developments of radar technology.
Author: Robert M. Rauber
Publisher: John Wiley & Sons
ISBN: 1118432657
Category : Science
Languages : en
Pages : 491
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Book Description
A comprehensive introduction to the current technology and application of radar in meteorology and atmospheric sciences Written by leading experts in the field, Radar Meteorology, A first Course offers an introduction to meteorological radar systems and applications, with emphasis on observation and interpretation of physical processes in clouds and weather systems. This comprehensive introduction to the subject offers an overview of the quantities essential to radar meteorology including the radar reflectivity factor, and Doppler, dual-polarization, and multi-wavelength radar variables. The authors highlight wind retrieval from single and multiple Doppler radars, precipitation estimation and hydrometeorological applications, with chapters dedicated to interpretation of radar data from warm season mid-latitude severe weather, winter storms, tropical cyclones and more. In addition, Radar Meteorology highlights research applications of this burgeoning technology, exploring dynamic applications such as space-borne and ground-based vertically pointing radar systems, and cloud, airborne and mobile radars. As meteorological radars are increasingly used professionally for weather observation, forecasting and warning, this much-needed text: Presents an introduction to the technical aspects and current application of radar as used in the meteorology and atmospheric sciences Contains full-colour illustrations that enhance the understanding of the material presented Examines the wide-range of meteorological applications of radar Includes problems at the end of each chapter as a helpful review of the contents Provides full instructor support with all illustrations and answers to problems available via the book’s instructor website. Radar Meteorology offers a much-needed introductory text to the study of radar as applied to meteorology. The text was designed for a one semester course based on the authors' own course in Radar Meteorology at the University of Illinois at Urbana-Champaign.
Author: Robert J. Moore (Hydrologist)
Publisher:
ISBN: 9781907161261
Category : Hydrology
Languages : en
Pages : 0
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Book Description
Weather Radar and Hydrology combines developments in weather radar technology with advances in hydrological application. It concerns the monitoring and forecasting of rainfall over space and time, and how the pattern of rainfall is transformed by a varied landscape into surface water runoff and river flow across a city, region or country. Thus it has significant practical application across water resource functions, including flood forecasting and warnA-ing, flood design,"
