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Academic literature on the topic 'Climat sahélien'
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Journal articles on the topic "Climat sahélien"
Bamba, S., V. Konsegré, A. Zida, et al. "Un cas d’entomophthoromycose rhinofaciale en climat tropical soudano-sahélien au Burkina Faso." Journal de Mycologie Médicale 27, no. 2 (2017): 254–60. http://dx.doi.org/10.1016/j.mycmed.2017.01.002.
Full textTindano, Elycée, Souleymane Ganaba, and Adjima Thiombiano. "Composition floristique et état des peuplements ligneux des inselbergs suivant un gradient climatique au Burkina Faso (Afrique de l'Ouest)." Flora et Vegetatio Sudano-Sambesica 17 (December 1, 2014): 9–27. http://dx.doi.org/10.21248/fvss.17.24.
Full textMandret, Gilles, A. Ourry, and Guy Roberge. "Effet des facteurs température et nutrition azotée sur la croissance des plantes fourragères tropicales. I. Variation saisonnière de la croissance d'une graminée tropicale, Brachiaria mutica, au Sénégal." Revue d’élevage et de médecine vétérinaire des pays tropicaux 43, no. 1 (1990): 119–24. http://dx.doi.org/10.19182/remvt.8879.
Full textBazie, P., B. Dieng, and P. Ackerer. "Bilan des transferts verticaux d'eau en zone non-saturée sous climat soudano-sahélien: application à l'estimation de la recharge des nappes." Revue des sciences de l'eau 8, no. 2 (2005): 237–60. http://dx.doi.org/10.7202/705221ar.
Full textNgambia Funkeu, R., V. S. Pandey, P. Dorny, and S. Killanga. "Etude épidémiologique des nématodes gastro-intestinaux chez les ovins en milieux urbain et périurbain à Maroua, Extrême Nord du Cameroun." Revue d’élevage et de médecine vétérinaire des pays tropicaux 53, no. 1 (2000): 17. http://dx.doi.org/10.19182/remvt.9760.
Full textClément, V., J. Bouix, A. Gueye, and R. L. Baker. "Estimation des paramètres génétiques de la résistance au parasitisme gastro-intestinal en élevage villageois de petits ruminants au Sénégal." Revue d’élevage et de médecine vétérinaire des pays tropicaux 52, no. 3-4 (1999): 291–303. http://dx.doi.org/10.19182/remvt.9678.
Full textMaiga, Amadou Hama, Yacouba Konate, Joseph Wethe, Kokou Denyigba, Denis Zoungrana, and Lassana Togola. "Performances épuratoires d’une filière de trois bassins en série de lagunage à microphytes sous climat sahélien : cas de la station de traitement des eaux usées de 21E (groupe EIER-ETSHER)." Revue des sciences de l'eau 21, no. 4 (2008): 399–411. http://dx.doi.org/10.7202/019163ar.
Full textOyeniyi, F. G., and E. O. Ewuola. "A review of strategies aimed at adapting livestock to volatile climatic conditions in Nigeria." Nigerian Journal of Animal Production 48, no. 4 (2021): 79–93. http://dx.doi.org/10.51791/njap.v48i4.3018.
Full textIssa, M., A. Yenikoye, Hamani Marichatou, and M. Banoin. "Spermogramme de béliers Peuls bicolores et Touaregs : influence du type génétique et de la saison." Revue d’élevage et de médecine vétérinaire des pays tropicaux 54, no. 3-4 (2001): 269. http://dx.doi.org/10.19182/remvt.9784.
Full textOuandaogo-Yameogo, Suzanne, Bernard Blavoux, Julien Nikiema, and Alain Nindaoua Savadogo. "Caractérisation du fonctionnement des aquifères de socle dans la région de Ouagadougou à partir d’une étude de la qualité chimique des eaux." Revue des sciences de l’eau 26, no. 3 (2013): 173–91. http://dx.doi.org/10.7202/1018784ar.
Full textDissertations / Theses on the topic "Climat sahélien"
Soriba, Mahaman. "Climat sahélien, entrainement physique et sommeil chez l'homme." Clermont-Ferrand 2, 1990. http://www.theses.fr/1990CLF21505.
Full textKouawa, Tadjouwa. "Traitement des boues de vidange par lits de séchage sous climat soudano-sahélien." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAD018/document.
Full textDespite the bad performances sometimes obtained according to the context and the empirical method of design, the use of drying beds (planted and not planted) for the treatment of faecal sludge (FS) increase in West Africa. To access to treatment performances in local context (Ouagadougou), the monitoring of 13 experimental drying beds were done. Based on the Terzaghi consolidation equation, the development of a numerical model were done according 2 approaches. Regarding removal efficiency, the performances of treatment of sludge on drying beds were mitigated. The results demonstrate that Oryza longistaminata, Sporobolus pyramidalis and Cyperus alopecuroïdes cannot be used in sludge drying planted beds for the treatment of FS. The simulations with the model in the approach 1 were better than those in approach 2. However, the approach 2 can reproduce the trends of volumetric moisture, the trends of consolidation coefficient and permeability as a function of depth and as a function of time
Sawadogo, Boukary. "Traitement des eaux usées industrielles par des procédés membranaires sous climat sahélien : cas des eaux usées de brasserie au Burkina Faso." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG085/document.
Full textThe beverage industries generate large volumes of wastewater daily. Due to production residues and washing and disinfecting products, these industrial discharges, in addition to being loaded with organic matter, contain mineral pollutants such as sodium. Reverse osmosis (RO), electrodialysis (ED) and nanofiltration (NF) are efficient processes for the removal of dissolved inorganic pollutants and the membrane bioreactor (MBR) for the degradation of organic pollution. 4 MBR pilots, 2 from NF and 1 from ED were used to study the treatment of effluents from the beer and soft drinks industry using membrane technologies in the Sahelian climate context. The biomass evolution in the biological reactor and the treatment efficiency were followed. The influence of the operating conditions on the facilities running was also evaluated. The results obtained show that the characteristics of the industrial wastewater used vary significantly with average levels of chemical oxygen demand (COD) of 5 gO2 / L, sodium of 0.5 mg / L and pH of 11. The evolution of the microorganisms in the biological reactor is influenced by the operating conditions, in particular the pH, the temperature, the organic load of the feed, the sludge retention time and the mechanical performance of the system. COD removal efficiencies between 93 and 96% were obtained both aerobically and anaerobically. Elimination of organic pollution was influenced by the acclimation of the biomass and by the mass loading in the reactor. Sodium was poorly retained by MBR treatment with low retention rates. The average biogas production yield with anaerobic MBR is estimated at 0.21 ± 0.03 L biogas/gCOD removed for an average flow rate of 89 ± 40 L/d. The application of NF to the MBR permeate has led to higher quality effluents with removal of both dissolved organic matter and ions. ED led to better salinity removal as a result of MBR but less of dissolved organic matter. The sodium concentrations in the final products of treatments obtained with NF and ED are less than 150 mg / L thus allowing a possible reuse of treated water for irrigation and a safe rejection in the environment. Taking into account the different activities, the operating cost of the current Brakina pre-treatment station is estimated at 140 FCFA/m3 of treated wastewater (€ 0.213), of which about 70% for the neutralization of wastewater by the addition of concentrated acid. Improving treatment with MBR-NF coupling shows an investment estimated at 3.8 billion FCFA (5.7 million euros). Operating expenses are estimated at 322 FCFA/m3 of treated wastewater (0.49 euros/m3 of treated wastewater) for an aerated MBR compared to 227 FCFA/m3 of treated wastewater (0.34 euro/m3 of treated wastewater) for anaerobic MBR is a decrease of 30%. The construction of such a system could lead to the sustainability of market gardening downstream of the Kossodo treatment plant and generate hundreds of permanent jobs with net revenues of more than 12 million FCFA/month (18.675 euros). Also, this could be a showcase for the social and environmental policy of Brakina. However, the major investments, the space requirements that the implementation of this proposal requires and the unavailability on site of technical competence for the curative maintenance of the system could be the main constraints to the implementation of this project.Key words: beverage production industry, electrodialysis, industrial wastewater, membrane bioreactor, nanofiltration
Barbier, Jessica. "Extrêmes climatiques - les vagues de chaleur au printemps sahélien." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19810/6/Barbier_Jessica_2_sur_3.pdf.
Full textLe, Drézen Yann. "Dynamiques des paysages de la vallée du Yamé depuis 4000 ans. Contribution à la compréhension d'un géosystème soudano-sahélien. (Ounjougou, Pays dogon, Mali)." Phd thesis, Université de Caen, 2008. http://tel.archives-ouvertes.fr/tel-00348161.
Full textLa vallée du Yamé est localisée dans la zone soudano-sahélienne au centre du Mali. Elle est le principal cours d'eau du Pays dogon. Afin de répondre à notre problématique, nous avons opté pour un plan thématique. Dans une première partie, nous présentons le cadre et les contextes d'études. La deuxième partie consiste en une présentation du cadre chronostratigraphique réalisé à haute résolution. La troisième partie correspond à l'analyse des formations fluvio-palustres et des fonctionnements hydro-sédimentaires (à partir d'analyses granulométriques et micromorphologiques). La quatrième partie est une présentation des paysages végétaux et de leur évolution, à partir des méthodes palynologiques, anthracologiques, carpologiques et de l'analyse du signal incendie. La cinquième partie repose sur une synthèse des résultats, avec une interprétation spatio-temporelle des paysages de la vallée du Yamé depuis quatre mille ans. Cette recherche permet d'observer une ouverture progressive des paysages associée à un changement de physionomie des espèces qui doit être reliée à une aridification du climat et à la mise en place d'agrosystèmes dans la région. La végétation a évolué dans la vallée entre différentes mosaïques de savanes et forêts claires et/ou denses sèches qui sont progressivement à caractère soudano-sahélien. Les espèces pyrophiles se développent progressivement, en relation avec l'émergence d'une agriculture basée sur la culture du mil, attestée par l'archéobotanique avec des feux saisonniers d'origine anthropique. Ces différentes analyses permettent de proposer des scenarii paysagers, qui synthétisent les évolutions des paysages au Pays dogon et met en évidence le rôle crucial des sociétés. Ainsi est mise en évidence l'influence croissante des hommes sur leur environnement en Afrique de l'Ouest, au cours de ces quatre derniers millénaires qui aboutit à la construction de véritables paysages culturels.
Frangi, Jean-Pierre. "Dynamique de la couche limite de surface sahélienne." Toulouse 3, 1988. http://www.theses.fr/1988TOU30247.
Full textVischel, Théophile. "Impact de la variabilité pluviométrique de méso-échelle sur la réponse des systèmes hydrologiques sahéliens : modélisation, simulation et désagrégation." Grenoble INPG, 2006. http://www.theses.fr/2006INPG0033.
Full textIt is of primary importance to understand how the climate variability influences the response of the Sahelian hydrological systems in ord to anticipate the hydrological impact of future climate changes and to define suitable strategies. Such studies require linking the large scale climate scenarios to the very localized water budget of sm ail catchments. This work deals with such scale issues which are essential when outputs of climate models are used to force hydrological models. The data used here characterize the continuum of space-time scales displayed by the Iwo types of hydrological systems of the Sahelian region: the sm ail endoreic systems at the left bank of the Niger River and the larger right bank tributary exoreic systems. Three main axes are investigated in the work. First we synthesize and update previous works about the description and the modelling of mesoscale rainfall variability, through the fine scale data from the AMMA-CATCH Niger observa tory. Then the impact of the spatial and temporal rainfall variability on runoff is quantified by assessing the error committed when input hydrological model data used sub-sample this rainfall variability. Finally, regarding these results and by using the developed modelling tools, rainfall regime changes and their impact on runoff are investigated through (i) the characterization of changes that have occurred during the particularly dry 1970-1989 period, (ii) hypothetic scenarios based on the actual knowledge of the potential climate changes that cou Id occur in the future
Brami, Diane. "Le climat et l'homme, facteurs de déséquilibres des milieux sensibles sahéliens : le cas des rives sud du lac Tchad (Tchad)." Paris 1, 2006. http://www.theses.fr/2006PA010521.
Full textKlutsé, Amah. "Epuration des eaux usées domestiques par lagunage en zone soudano-sahélienne : Ouagadougou, Burkina Faso." Montpellier 2, 1995. http://www.theses.fr/1995MON20217.
Full textFall, Ababacar. "Le Ferlo sénégalais : approche géographique de la vulnérabilité des anthroposystèmes sahéliens." Thesis, Paris 13, 2014. http://www.theses.fr/2014PA131028.
Full textThe pastoral anthroposystem of Senegalese Ferlo evolves in an environment historically neglected by agricultural policies because of its characteristics particular biophysics, unfavorable to the agriculture and to the shape of development other than the extensive breeding. This primacy of the itinerant breeding is nowadays more and more disputed by the development of the farming in a context marked by the improvement of the conditions of the rainfall in West-African Sahel, soil depletion in the Groundnut Basin and the multiplication of agricultural development at the valley of the Senegal River. By combining the analysis of remote sensing imagery for mapping land cover changes by the vegetation cover, the study of flora and vegetation landscape and the exploitation of the investigations in villages and camps, this thesis attempts to define the geography of the vulnerability of rural populations and ecosystems which they use. So, pastoralists evolve with daily adaptation strategies in these circles inside Senegal marked by deep ecological instability and by the transformations at work in the Senegalese rural society. These socio-environmental changes contribute to the dynamics of plant landscapes and raise the question of ecosystem degradation
Books on the topic "Climat sahélien"
Tillet, Thierry. L' homme préhistorique et le climat: Afrique orientale et mutations, Afrique sahélienne et migrations. Centre Djoliba, 1988.