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L’écotourisme forestier : pour un rapprochement entre tourisme et environnement à la Martinique
Dominique Augier
études Caribeénnes , 2008, DOI: 10.4000/etudescaribeennes.440
Abstract: L’article propose une réflexion sur le positionnement touristique de la Martinique confrontée à une rude concurrence régionale. L’analyse porte sur les potentialités de cette petite le montagneuse (1128 km2) en matière d’écotourisme forestier. Cette nouvelle orientation touristique doit permettre d’enrichir une offre touristique qui se limite encore aux simples pratiques balnéaires. L’écotourisme peut aussi être un outil de gestion des ressources forestière et plus généralement il est susceptible de soutenir des activités dans les secteurs montagneux les moins développés de la Martinique. The article is an evaluation of the tourist situation in Martinique now facing stiff regional competition. The analysis focuses on the potential of this small mountainous island (1128 km2) in the area of forest ecotourism. This new focus is meant to enhance a tourist potential which is still largely limited to the seaside and its attractions. Ecotourism can also be a tool not only for forest resource management but also a means for promoting development initiatives in the less developed mountainous regions of Martinique.
Les écosystèmes marins de la Cara be : identification, diffusion et modes de gestion Marine ecosystems of the Caribbean : identification, dissemination and management methods
Dominique Augier
études Caribeénnes , 2011, DOI: 10.4000/etudescaribeennes.4343
Abstract: Le milieu marin de la Mer des Cara bes est composé de trois écosystèmes principaux : les récifs coralliens, les mangroves et les herbiers, qui abritent une faune et une flore exceptionnelles. Mais l’équilibre fragile de ces espaces est menacé par les nombreuses activités humaines qui les dégradent progressivement. Face aux enjeux socio-économiques qu’ils représentent pour les pays caribéens, ces derniers ont établi un cadre juridique à l’échelle régionale pour la protection et la gestion de leur ressource marine, la Convention de Carthagène. Après avoir dresser un tableau de la situation environnementale des principaux écosystèmes marins caribéens, il convient de faire un point sur les mode de gestion mis en uvre pour les préserver. The marine environment of the Caribbean Sea is composed primarily of three main ecosystems: coral reefs, mangroves and seagrasses, home to fauna and flora. But the delicate balance of these areas is threatened by many human activities that deteriorate gradually deteriorated them. Deal with socio-economic issues around these resources, Caribbean countries have established a legal framework at the regional level to ensure the protection and management of marine resources (the Cartagena Convention). After drawing up an overview of the environmental situation of the main Caribbean marine ecosystems, it should present the management mode adopted to preserve them.
De la connaissance des milieux marins à la gestion raisonnée des ressources From the knowledge of marine environments to the management of marine resources
Dominique Augier,Patrick Watson
études Caribeénnes , 2011, DOI: 10.4000/etudescaribeennes.4475
Abstract: Dans le cadre de cet article introductif au dossier thématique sur les ressources marines, les auteurs rappellent les enjeux liés aux usages et types de consommation, à leurs modalités de protection et systèmes de gouvernance. Ils rappellent leur importance environnementale, sociale mais aussi économique pour bon nombre de pays et de communautés c tières. Ils mettent l’accent sur les actions déjà mises en uvre et sur la nécessité d’approfondir les connaissances dans ce domaine. In this introductory article of the issue paper on marine resources, the authors review the issues with usage and consumption patterns, in terms of protection and governance systems. They stress their environmental significance, social but also economic for many country and coastal communities. They focus on the actions already implemented and the need to deepen knowledge in this field.
Dynamical properties of low dimensional CuGeO3 and NaV2O5 systems
David Augier,Didier Poilblanc
Physics , 1997, DOI: 10.1007/s100510050148
Abstract: Properties of low-dimensional spin-Peierls systems are described by using a one dimensional S=1/2 antiferromagnetic Heisenberg chain linearly coupled to a single phonon mode of wave vector pi (whose contribution is expected to be dominant). By exact diagonalizations of small rings with up to 24 sites supplemented by a finite size scaling analysis, static and dynamical properties are investigated. Numerical evidences are given for a spontaneous discrete symmetry breaking towards a spin gapped phase with a frozen lattice dimerization. Special emphasis is put on the comparative study of the two inorganic spin-Peierls compounds CuGeO3 and NaV2O5 and the model parameters are determined from a fit of the experimental spin gaps. We predict that the spin-phonon coupling is 2 or 3 times larger in NaV2O5 than in CuGeO3. Inelastic neutron scattering spectra are calculated and similar results are found in the single phonon mode approximation and in the model including a static dimerization. In particular, the magnon S=1 branch is clearly separated from the continuum of triplet excitations by a finite gap.
A new formulation of the atmospheric spectral energy budget, with application to two high-resolution general circulation models
Pierre Augier,Erik Lindborg
Physics , 2012, DOI: 10.1175/JAS-D-12-0228.1
Abstract: A new formulation of the spectral energy budget of kinetic and available potential energies of the atmosphere is derived, with spherical harmonics as base functions. Compared to previous formulations, there are three main improvements: (i) the topography is taken into account, (ii) the exact three-dimensional advection terms are considered and (iii) the vertical flux is separated from the energy transfer between different spherical harmonics. Using this formulation, results from two different high resolution GCMs are analyzed: the AFES T639L24 and the ECMWF IFS T1279L91. The spectral fluxes show that the AFES, which reproduces realistic horizontal spectra with a k^{-5/3} inertial range at the mesoscales, simulates a strong downscale energy cascade. In contrast, neither the k^{-5/3} vertically integrated spectra nor the downscale energy cascade are produced by the ECMWF IFS.
Isotropy conditions for lattice Boltzmann schemes. Application to D2Q9*
Augier Adeline,Dubois Francois,Graille Benjamin
ESAIM : Proceedings , 2012, DOI: 10.1051/proc/201235013
Abstract: In this paper, we recall the linear version of the lattice Boltzmann schemes in the framework proposed by d’Humières. According to the equivalent equations we introduce a definition for a scheme to be isotropic at some order. This definition is chosen such that the equivalent equations are preserved by orthogonal transformations of the frame. The property of isotropy can be read through a group operation and then implies a sequence of relations on relaxation times and equilibrium states that characterizes a lattice Boltzmann scheme. We propose a method to select the parameters of the scheme according to the desired order of isotropy. Applying it to the D2Q9 scheme yields the classical constraints for the first and second orders and some non classical for the third and fourth orders.
Tourisme, écotourisme et stratégies de développement dans la Cara be
Dominique Augier,Pascal Saffache,Olivier Dehoorne
études Caribeénnes , 2008, DOI: 10.4000/etudescaribeennes.3383
Abstract: Le secteur du tourisme et des services s’est imposé comme le véritable moteur des économies insulaires de la Cara be depuis la fin de années 1980, décennie. Dans ces territoires confrontés à la crise des traditionnelles économies de plantations, le tourisme a pris une importance considérable (19,2 milliards de dollars US pour une croissance moyenne annuelle de 7% depuis 1990). Cependant les modalités du développement touristique actuelles ne sont pas sans poser certains problèmes d’ordre économique (faiblesses des retombées locales) et environnemental (concentration des flux). Les territoires de la Cara be insulaire développent de nouvelles stratégies touristiques autour de l’écotourisme Tourism has become the driving force of the island economies of the Caribbean basin since the latter part of the 1980s. Within this island realm, the traditional plantation economies have gone through an economic crisis while tourism. On the other hand, has taken on considerable importance (19.2 billion dollars and a 7% annual growth rate since 1990. Nevertheless this growth has not been without its economic problems (a low level of local linkages) and environmental (concentration of tourist flows). Caribbean island tourism is now concentrating its efforts on developing new strategies based on ecotourism perspectives.Tourism, ecotourism and development strategies in the Caribbean
Low-energy excitations of spin-Peierls chains with modified bond-impurities
D. Augier,J. Riera,D. Poilblanc
Physics , 1999, DOI: 10.1103/PhysRevB.61.6741
Abstract: The introduction of modified bond-defects in spin-Peierls systems is investigated in a model of antiferromagnetic Heisenberg spin chains coupled to adiabatic phonons. Generically, new low-energy magnetic or non-magnetic excitations appear below the bulk spin gap energy. When two adjacent bonds are modified, these excitations can be interpreted in terms of boundstates of a soliton with the localized spin-1/2 located on the impurity site. It is shown that the confining potential occurs even in the case of {\it isolated} chains.
Isotropy conditions for lattice Boltzmann schemes. Application to D2Q9
Adeline Augier,Fran?ois Dubois,Benjamin Graille
Mathematics , 2011,
Abstract: In this paper, we recall the linear version of the lattice Boltzmann schemes in the framework proposed by d'Humi\'eres. According to the equivalent equations we introduce a definition for a scheme to be isotropic at some order. This definition is chosen such that the equivalent equations are preserved by orthogonal transformations of the frame. The property of isotropy can be read through a group operation and then implies a sequence of relations on relaxation times and equilibrium states that characterizes a lattice Boltzmann scheme. We propose a method to select the parameters of the scheme according to the desired order of isotropy. Applying it to the D2Q9 scheme yields the classical constraints for the first and second orders and some non classical for the third and fourth orders.
Linear Lattice Boltzmann Schemes for Acoustic: parameters choices and isotropy properties
Adeline Augier,Fran?ois Dubois,Benjamin Graille
Mathematics , 2011,
Abstract: In this paper, we investigate the numerous parameters choices for linear lattice Boltzmann schemes according to the definition of the isotropic order given in \cite{ADG11}. This property---written in a general framework including all of the \ddqq schemes---can be read through a group operation. It implies some relations on the parameters of the scheme (equilibrium states and relaxation times) that give rigorous methodology to select them according to the desired order of isotropy. For acoustic applications in two spaces dimensions (namely \ddqn and \ddqt schemes) this methodology is used to propose a full description of the sets of parameters that involve isotropy of order $m$ ($m\in\{1,2,3,5\}$ for \ddqn and $m\in\{1,2\}$ for \ddqt). We then propose numerical illustrations for the \ddqn scheme.
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