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Titre : La forêt face aux tempêtes Type de document : Monographie Auteurs : Yves Birot, Éditeur scientifique ; Guy Landmann, Éditeur scientifique ; Ingrid Bonhême , Éditeur scientifique
Editeur : Versailles : Quae Année de publication : 2009 Collection : Synthèses, ISSN 1777-4624 Importance : 433 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-2-7592-0330-7 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Termes IGN] Aves
[Termes IGN] carte de la végétation
[Termes IGN] cartographie des risques
[Termes IGN] chablis (sylviculture)
[Termes IGN] dommage matériel
[Termes IGN] écosystème forestier
[Termes IGN] forêt tempérée
[Termes IGN] France (administrative)
[Termes IGN] modèle statistique
[Termes IGN] Picea abies
[Termes IGN] Pinus pinaster
[Termes IGN] prévention des risques
[Termes IGN] Pseudotsuga menziesii
[Termes IGN] Quercus (genre)
[Termes IGN] risque naturel
[Termes IGN] Scolytinae
[Termes IGN] tempête
[Termes IGN] tempête Klaus de 2009
[Termes IGN] tempête Lothar de 1999
[Termes IGN] vent
[Termes IGN] zone sinistrée
[Vedettes matières IGN] Economie forestièreIndex. décimale : 423.5 Santé des forêts [dépérissement, incendies, dégâts dus aux ravageurs ou aux aléas naturels, changement climatique, etc.] Résumé : (Editeur) Les 26 et 27 décembre 1999, Lothar et Martin, deux tempêtes lourdes d'effets ont traversé la France, laissant derrière elles des forêts méconnaissables, des forestiers meurtris et une filière de la forêt et du bois fortement et durablement affectée. Pourquoi les écosystèmes forestiers sont-ils si vulnérables ? Pourquoi de tels aléas se produisent-ils ? Comment en limiter les effets ? Quelques années plus tard, et au lendemain d'une nouvelle tempête, Klaus, qui a frappé le Sud-Ouest du pays, cet ouvrage de synthèse apporte les réponses de la communauté scientifique à ces questions, notamment à travers les résultats du programme de recherche intitulé « Forêt, vent et risque », lancé en 2000 par les Pouvoirs Publics et animé par le Gip Ecofor. Cet ouvrage est destiné au monde forestier, aux gestionnaires, techniciens et professionnels, aux chercheurs, ainsi qu’aux enseignants et aux étudiants. Numéro de notice : 20969 Affiliation des auteurs : non IGN Thématique : FORET Nature : Recueil / ouvrage collectif Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=41854 ContientRéservation
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Code-barres Cote Support Localisation Section Disponibilité IFN-002-000002 423.5 BIR Livre Bordeaux Bibliothèque Bordeaux IFN Exclu du prêt 20969-01 48.00 Livre Centre de documentation Environnement Disponible IFN-001-000308 423.5 BIR Livre Nogent-sur-Vernisson Bibliothèque Nogent IFN Exclu du prêt
Titre : Geomorphology of desert environments Type de document : Monographie Auteurs : Anthony J. Parsons, Auteur ; Athol D. Abrahams, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2009 Importance : 831 p. Format : 21 x 27 cm ISBN/ISSN/EAN : 978-1-4020-5719-9 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomorphologie
[Termes IGN] changement climatique
[Termes IGN] climat aride
[Termes IGN] désert
[Termes IGN] dune
[Termes IGN] écosystème
[Termes IGN] érosion
[Termes IGN] hydrographie
[Termes IGN] roche
[Termes IGN] sédiment
[Termes IGN] vent de sable
[Termes IGN] zone arideRésumé : (éditeur) About one-third of the Earth's land surface experiences a desert climate, and this area supports approximately 15% of the planet's population. This percentage continues to grow, and with this growth comes the need to acquire and apply an understanding of desert geomorphology. Such an understanding is vital in managing scarce and fragile resources and in mitigating natural hazards. This authoritative reference book is comprehensive in its coverage of the geomorphology of desert environments, and is arranged thematically. It begins with an overview of global deserts, proceeds through treatments of weathering, hillslopes, rivers, piedmonts, lake basins, and aeolian surfaces, and concludes with a discussion of the role of climatic change. Written by a team of international authors, all of whom are active in the field, the chapters cover the spectrum of desert geomorphology. Note de contenu : 1- Introduction
2- Weathering
3- Hillslopes
4- Rivers
5- Piedmonts
6- Lake Basins
7- Aeolian Surfaces
8- Climatic ChangeNuméro de notice : 25829 Affiliation des auteurs : non IGN Nature : Monographie En ligne : https://doi.org/10.1007/978-1-4020-5719-9 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95151
Titre : Gli strumenti di meteorologia dell'Istituto Geografico Militare Type de document : Monographie Auteurs : E. Borchi, Auteur ; R. Macii, Auteur Editeur : Florence : Istituto Geografico Militare IGM Année de publication : 2009 Importance : 175 p. Format : 17 x 25 cm ISBN/ISSN/EAN : 978-88-523-9139-2 Note générale : Bibliographie Langues : Italien (ita) Descripteur : [Vedettes matières IGN] Atmosphère
[Termes IGN] géothermie
[Termes IGN] histoire des sciences et techniques
[Termes IGN] instrument ancien
[Termes IGN] météorologie
[Termes IGN] thermographieNuméro de notice : 10327 Affiliation des auteurs : non IGN Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62395 Réservation
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Titre : GPS based dynamic monitoring of air polluants in the city of Zurich Type de document : Thèse/HDR Auteurs : Philippe Thomas Kehl, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2009 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 78 Importance : 155 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-22-2 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] changement climatique
[Termes IGN] données spatiotemporelles
[Termes IGN] polluant
[Termes IGN] pollution atmosphérique
[Termes IGN] positionnement par GPS
[Termes IGN] surveillance écologique
[Termes IGN] temps réel
[Termes IGN] Zurich (Suisse)Index. décimale : 30.83 Applications océanographiques de géodésie spatiale Résumé : (Auteur) Despite the decrease in road traffic emissions air pollutant concentrations of nitrogen dioxide, particulates and ozone often exceed the limit values at urban sites in Switzerland. This project aimed at providing a dynamic and real-time assessment of ambient air quality and at improving the understanding of the interaction between road traffic emissions and urban air quality. It is designed as a feasibility study for dynamic air-pollution measurements in the local scale. Three research topics were being pursued in this thesis : air quality monitoring, satellite based positioning (GPS) of a measurement system in an urban environment and the influence of road traffic emissions on the air quality in the city of Zurich.
The data analysed are based on the autonomous operation of a measuring system on a tram in regular service. A dedicated measurement system was built to measure the concentrations of the three most relevant air pollutants in Zurich. These are nitrogen oxides (NO and NO2), aerosol particles (participate matter) and ozone (O3). Nitrogen oxides and ozone are measured using the standard techniques involving chemiluminescence of NO and UV absorption of O3, respectively. Particulates are measured using a diffusion charging particle sensor which suits the requirements for space, a short measurement period and resistance against vibrations. Furthermore meteorological parameters (temperature, humidity and pressure) were measured.
The tram was equipped with the measurement system. During two measurement campaigns in spring/summer 2005 and winter/spring 2005/06 the tram travelled on three different tram tracks, which cross the city in north-south or east-west direction. They represent the various characteristics of an urban environment, such as busy places and parts of the city without private road traffic. The measurements were being transferred in real-time using mobile communication technologies (GSM, GPRS). A web site was being updated in real-time with the position of the tram on a map, the measurements and the operating state of the measurement system and its sensors.
GPS was used for precise positioning and timing. Urban sites often degrade navigation accuracy and availability. Therefore, a suitable receiver was evaluated and techniques to provide precise and reliable positioning data were developed. The latter involves filtering and projective map-matching to exclude faulty positions and determine precise positions. Furthermore, standard position-time relations for the tram were determined to interpolate GPS outages, which last a few seconds up to a few dozens of seconds.
A dispersion modelling study was carried out for a 3-3 krn2 area in the inner city of Zurich using a state-of-the art numerical dispersion model. This involved the models NEMO (emissions from traffic), GRAMM (meteorology) and GRAL (dispersion) from the Institute of Internal Combustion Engines and Thermodynamics of the Graz University of Technology.
The feasibility of dynamic and real-time measurements and its limitations were shown by carrying out two measurement campaigns lasting 18 and 20 weeks in spring/summer 2005 and winter/spring 2005/06. The analysis of the measurements clearly show varying concentrations of air pollutants along the tram track as well as characteristic hot-spots at busy places.Note de contenu : 1 Introduction
2 Scientific Theory
2.1 Air pollution & emission sources
2.1.1 Nitrogen oxides
2.1.2 Ozone
2.1.3 Conversion between ppb and mass per volume units
2.1.4 Particulate matter
2.1.5 Smog
2.1.6 Ambient air quality standards and legislation
2.1.7 Air quality trends for Zurich
2.2 Global positioning system (GPS)
2.2.1 GPS constellation
2.2.2 Measurement principle
2.2.3 Sources of errors and accuracy
2.2.4 GPS in urban areas
2.2.5 Co-ordinate transformation
3 Measurement System
3.1 The measurement platform
3.2 The measurement system
3.3 Environmental sensors & measurement principles
3.3.1 Nitrogen oxides sensor
3.3.2 Ozone sensor
3.3.3 Particle sensor
3.3.4 Meteorological sensors
3.4 Positioning sensor & time reference
3.5 Power supply & control
3.6 Computer & data logger
3.7 Telemetry
4 Measurement Campaigns & Data Processing
4.1 Tram operation and tram lines
4.2 Measurement campaigns
4.2.1 Campaign #1
4.2.2 Campaign #2
4.2.3 Real-time visualisation of the measurements
4.3 Data post-processing
4.3.1 Database
4.3.2 Environmental measurements
4.3.3 GPS measurements
4.3.4 Map-matching and interpolation
4.3.5 Georeferencing
4.4 Permanent stations data
5 Data Analysis & Results
5.1 Overview over the available data
5.1.1 Raw time series
5.1.2 Daily mean values .
5.2 Data quality assessment
5.3 Data analysis & discussion .
5.3.1 Comparison of daily mean values
5.3.2 Comparison of monthly mean values
5.3.3 Limit value exceedances
5.3.4 Comparison of tram measurements at the UGZ permanent station
5.3.5 Summer 2005
5.3.6 Winter 2006
5.4 GPS performance analysis
6 Emission & Dispersion Modelling
6.1 Introduction
6.2 Modelling approach
6.3 Geometrical data
6.3.1 Topography (elevation model)
6.3.2 Buildings
6.4 Emission modelling
6.4.1 Overview
6.4.2 Input data
6.4.3 Results
6.5 Meteorological modelling (wind field simulations) .
6.5.1 Overview
6.5.2 Classification of weather situations
6.5.3 Calculation
6.5.4 Analysis
6.6 Dispersion modelling
6.6.1 Calculation
6.6.2 Results analysis
6.7 Comparison with measurements
6.7.1 Summer 2005
6.7.2 Comparison with the NABEL permanent station
6.7.3 Winter 2006
7 ConclusionsNuméro de notice : 15513 Affiliation des auteurs : non IGN Autre URL associée : URL ETH Zurich Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : 10.3929/ethz-a-005553378 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-78.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62746 Réservation
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Titre : High-resolution GPS tomography in view of hydrological hazard assessment Type de document : Thèse/HDR Auteurs : Simon Lutz, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2009 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 76 Importance : 200 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-20-8 Note générale : Bibliographie
Doctoral thesisLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] aérosol
[Termes IGN] atmosphère terrestre
[Termes IGN] Bernese
[Termes IGN] campagne d'expérimentation
[Termes IGN] collocation
[Termes IGN] distribution spatiale
[Termes IGN] double différence
[Termes IGN] interpolation spatiale
[Termes IGN] météorologie
[Termes IGN] méthode des moindres carrés
[Termes IGN] modèle atmosphérique
[Termes IGN] prévision météorologique
[Termes IGN] propagation troposphérique
[Termes IGN] réfraction atmosphérique
[Termes IGN] risque naturel
[Termes IGN] temps réel
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] tomographie
[Termes IGN] traitement de données GNSS
[Termes IGN] Valais (Suisse)
[Termes IGN] vapeur d'eau
[Termes IGN] voxelIndex. décimale : 30.83 Applications océanographiques de géodésie spatiale Résumé : (Auteur) In the last few years, the use of propagation delays of GNSS radio signals due to the atmospheric effect has gained considerable importance as a valuable contribution to numerical weather forecasting. GPS-based tomography is a dedicated method to resolve the temporal variation and spatial distribution of the most important constituent of the atmosphere, the tropospheric water vapor. The four-dimensional tomographic approach, however, has not yet been completely established. Investigations on the small-scale high-resolution configuration will now help to determine and model water vapor distribution and variation over local, mountainous catchment areas. Especially, the development towards near real-time analysis with a high update rate of less than one hour will reveal the potential in the field of short and medium range forecasts.
Three main objectives were defined for this research project: The first objective was the study of the feasibility of GPS tomography in a small-scale and Alpine area. Furthermore, the processing of campaign-type measurements had to be considered specifically. The second aim was the determination of the four-dimensional distribution of atmospheric water vapor over a local region using GPS tomography in view of hydrological hazard assessment. Thirdly, aspects of real-time determination had to be investigated. In this context, it had to be accounted for that, instead of precise GNSS satellite orbits, predicted ones like broadcast ephemerides or ultra-rapid orbits had to be used. Also, it had to be addressed that the processing time is a critical issue in real-time computation. As a consequence, the parameters of the complete GPS processing were refined and adapted to near real-time applications. Furthermore, new algorithms in the tomographic software were to be designed and evaluated.
The tomographic software package AWATOS (Atmospheric Water Vapor Tomography Software), developed at the Geodesy and Geodynamics Laboratory, ETH Zurich, was used for the assimilation of double-differenced GPS observations and interpolated meteorological data sets. The spatial distribution of water vapor can be determined by least-squares inversion with a high temporal resolution.
The work was carried out in five steps: Simulations helped to design an optimal GPS network for the tomographic purpose. Based on these findings, two dedicated field campaigns were performed to study the feasibility of the method for a non-permanent densification network in an Alpine region in Switzerland. Secondly, GPS derived zenith total delays (ZTD) as well as double-differenced residuals were estimated using a high performance and high accuracy post-processing software package (Bernese GPS Software Version 5.0). The results were validated by comparison with independent methods. With the software package COMEDIE, meteorological data was collocated and interpolated for the separation of the total delays into a wet and a dry part. In the third step, this set of data was processed with the GPS tomography software package AWATOS to obtain spatially and temporally highly-resolved wet refractivity fields. An automatic generation of tomographic voxel models was developed in the forth step. This tool allows high flexibility in tomographic processing and forms a fundamental part of an adaptive method of choosing voxel models at a particular spatial resolution. In the fifth step, the aspects of near real-time processing were investigated.
Measurements from a solar spectrometer and data from the current numerical weather model COSMO-7 of MeteoSwiss were available for comparison purposes. During the campaigns, radiosondes were launched to measure vertical profiles of the tropospheric meteorological components in situ and to validate the tomographic results.
The success of the tomographic method was revealed by the statistical analyses. The wet refractivity profiles from the GPS tomography software package AWATOS in the high-resolution mode match the profiles derived from corresponding radiosonde measurements within 10 ppm (refractivity units). The AWATOS profiles represent the characteristics of the different tropospheric layers in most cases with high significance.
The accuracy of GPS tomography in near real-time was assessed based on dedicated case studies with real-time orbits. The error budget of the near real-time calculations was compared to the best postprocessing solutions available. Due to large variations in the time series of the Up component of the GPS coordinate estimation, the broadcast ephemerides are not recommended for GPS meteorological applications. But ultra-rapid orbits, which are also available in real-time, yield satisfying results regarding tropospheric parameter estimation (ZTD) and the high-resolution GPS tomographic analysis.Note de contenu : 1 Introduction
1.1 Trends in GPS meteorology
1.2 Research review of atmospheric water vapor profiling
1.3 Significance of high-resolution GPS tomography
1.3.1 For the research community
1.3.2 For practical applications
1.4 Objectives
1.5 Structure
2 Theoretical background of GPS meteorology
2.1 Atmospheric water vapor
2.2 Radio wave refractivity
2.3 Refraction and path delay modeling
2.3.1 Definition
2.3.2 The Saastamoinen formula
2.3.3 Integrating tropospheric refractivity
2.3.4 Path delay interpolation with COITROPA
2.4 The Global Positioning System (GPS)
2.4.1 Introduction to GPS
2.4.2 The GPS observation equations
2.4.3 Mapping functions and standard models
2.4.4 Troposphere modeling in the Bernese GPS Software
2.5 The software package COMEDIE
2.5.1 4-D refractivity field from meteorological data
2.5.2 Estimation of tropospheric path delays
3 Ground-based GPS tomography of the neutral atmosphere
3.1 Models, methods and algorithms
3.1.1 The tomographic voxel model
3.1.2 The apriori model .
3.1.3 Inter-voxel constraints
3.1.4 Separation of the total path delay
3.2 The software package AWATOS
3.2.1 Double-difference GPS tomography
3.2.2 The tomographic equation system
3.2.3 Ray tracing and the design matrix
3.2.4 (Pscudo-) Observations and the weight matrix
3.2.5 Error budget
3.3 Network analysis tool
4 Outline of the two field campaigns
4.1 Introduction
4.2 The project area in the canton of Valais (Switzerland)
4.3 The July 2005 field campaign
4.3.1 GPS network
4.3.2 Meteorological ground measurement network
4.3.3 Radiosondes
4.4 The October 2005 field campaign
4.4.1 GPS Network
4.4.2 Meteorological ground measurement network
4.4.3 Radiosondes
4.4.4 Solar Spectrometry for comparison purpose
5 Data preprocessing
5.1 Introduction
5.2 GPS data processing
5.2.1 Overview
5.2.2 Criteria for fix station selection
5.2.3 Parameter settings in the Bernese GPS Software
5.2.4 Network solutions
5.2.5 Section summary
5.3 Meteorological data processing
5.4 Path delay comparison
6 The numerical weather model COSMO-7
6.1 Model description
6.2 Distribution of the available data
6.3 Data processing workflow
6.4 Data analysis
6.4.1 Comparison with balloon sounding profiles
6.4.2 Time series of integrated path delays
6.4.3 Comparison with time series of hourly GPS-ZTD
6.4.4 ZTD comparison with rainfall data
7 Enhancements of AWATOS
7.1 Introduction
7.2 New models and algorithms
7.2.1 Designing the voxel model
7.2.2 Obtaining a priori information
7.2.3 Allocation of meteorological data
7.2.4 Selection of beneficial stations
7.3 Further analysis tools
7.4 Notes on near real-tirnc analysis and predictive algorithms
7.5 Accuracy and reliability assessment
8 Results and discussion
8.1 Towards high spatial resolution
8.1.1 Impact of vertical spacing
8.1.2 Vertical resolution and cutoff elevation angle
8.1.3 Impact of horizontal spacing
8.1.4 Summary on the July 2005 campaign data
8.1.5 Summary on the October 2005 campaign data
8.1.6 Impact of a reduced network in October 2005
8.1.7 Discussion on spatial resolution
8.2 Correlation analysis with meteorological surface data
8.2.1 Comparison with air temperature
8.2.2 Wet refractivity variation and sunshine duration
8.2.3 Dew point temperature and atmospheric water vapor
8.3 Aspects of changing temporal resolution
8.4 Investigations in near real-time analysis
8.4.1 Processing real-time GPS orbits
8.4.2 Examination of time correlation strategies
9 ConclusionsNuméro de notice : 15512 Affiliation des auteurs : non IGN Autre URL associée : URL ETH Zurich Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : 10.3929/ethz-a-005648120 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-76.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62745 Réservation
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