La dynamique superficielle du panache du Rhône d'après l'imagerie infrarouge satellitaire

International audienceL'examen systématique d'environ 150 thermographies du Golfe du Lion permet de déterminer les limites superficielles du panache thermique en mer et, grâce à l'apport de données météorologiques et hydrauliques concourantes, de décrire son évolution. Le vent a une action prépondérante et rapide sur la forme de la nappe, nettement déviée vers la droite du vent d'environ 50°. Le temps de réponse de la nappe à cette action croît avec le débit du fleuve, et est de l'ordre de 5 heures

Redressements NOAA AVHRR

Ce texte décrit les algorithmes utilisés par le logiciel de redressement NOAA developpé au laboratoire de télédétection du Centre de Recherche Océanographique de Dakar Thiaroye (CRODT). Il est opérationnel depuis septembre 1986. Il insiste sur les problèmes d'implantation de ce type de programme sur un petit calculateur et indique les performances obtenues. (Résumé d'auteur

Quel avenir pour le bois énergie en région méditerranéenne ? Le point de vue de l'Office national des forêts -

Dans cet article, Philippe Demarcq nous apporte le point de vue de l'Office national des forêts sur le développement du bois énergie en région méditerranéenne. Il y souligne particulièrement l'importance d'instaurer, dès maintenant, un dialogue avec les populations et les élus, pour mieux faire comprendre et admettre les impacts paysagers et environnementaux qu'une mobilisation accrue de la ressource risque d'entraîne

Towards a Circular Product (Re)Design Methodology: Proposition of the Unlinear Method to Foster Circularity

Works on garment and shoe dismantlement and recycling have highlighted the complexity of this kind product and the difficulty to find a recycling channel for each material they are made of. The way they are designed perturbate the recycling process at products end of life. This paper examines these product complexities and proposes Unlinear methodology to help product design teams to redesign a more circular products which materials can be recovered at the end of their life. This method is based on a standardized product representation tool where each component product is made of is represented with its material and the function it ensures

Defining Mediterranean and Black Sea biogeochemical Subprovinces and Synthetic ocean indicators using mesoscale oceanographic features

The Mediterranean and Black Seas are semi-enclosed basins characterized by high environmental variability and growing anthropogenic pressure, which has led to increasing need for a bioregionalization of the oceanic environment at local and regional scales that can be used as a geographical reference with managerial applications. We aim to develop synthetic indices of the key oceanographic dynamics of each region to quantify baselines from which to assess variability and change. To do this, we compile a data set of 101 months (2002-2010) of a variety of both “classical” (i.e., sea surface temperature, surface chlorophyll a, and bathymetry) and “mesoscale” (i.e., eddy kinetic energy, finite-size Lyapunov exponents, and surface frontal gradients) ocean features that we use to characterize the surface ocean variability. We employ a k-means clustering algorithm to objectively define biogeochemical regions based on classical features, and for the first time, on mesoscale features and a combination of both classical and mesoscale features. Principal components analysis is then performed on the oceanographic variables to define integrative indices to monitor at monthly resolutions the environmental changes within each resultant region. Using both the classical and mesoscale features, we find five biogeochemical regions for the Mediterranean and Black Seas. Interestingly, the use of mesoscale variables contributes highly in the delineation of the open ocean. The first axis of the principal component analysis is explained primarily by classical ocean features and the second axis is explained by mesoscale features. Biogeochemical regions identified by the present study can be useful within the European management framework as an objective geographical framework of the Mediterranean and Black Seas, and the integrative environmental indices developed here can be used to monitor variability and long-term change.JRC.H.1-Water Resource

Adapter une exposition de CSTI pour le jeune public

Comment mettre en scène des éléments dont le contenu textuel et iconographique est déjà en partie produit ? Comment réaliser une scénographie cohérente pour le visiteur ? Comment intégrer des éléments manquants ? Quels auteurs pour quels discours ? Comment donner envie de lire à tous, mais surtout aux enfants ? Tels ont été les questions posées par l’équipe d’animation du CCSTI de Grenoble lors de la présentation de l’exposition « S.O.S. Pôles, le changement climatique en question ».How to show elements of which the written and iconographic content is already partially produced ? How to set up a coherent scenography for the visitor ? How to include missing elements ? Which authors for which messages ? How to motivate everyone to read, especially children ? : such were the questions that the organisation team of the CCSTI of Grenoble asked during the presentation of the exhibition ‘S.O.S. Poles, climatic change in question’

The dynamics of the Mediterranean Sea from space: some techniques and their applications

This paper presents some remote sensing techniques and their applications to the understanding of the marine dynamics of the Mediterranean Sea. We emphasize the usefulness of the data provided by meteorological satellites in the visible, near-infrared and infrared ranges. Two techniques are discussed, the first dealing with estimations of wind magnitude at the sea surface, and the second with the prediction of the surface current field. Since the solar light reflected by the surface of the sea depends strongly on the sea state which is driven by the wind, observations of glitter pattern in the near infrared range allow measurements of the wind magnitude. On the other hand, estimations of surface current can be made either when considering patches observed in visible or infrared as passive tracers, or when solving the equation of the heat conservation using a couple of infrared images