Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Caracterisation Et Modelisation Dun Aquifere Libre En Hausse Au Sahel
Download Caracterisation Et Modelisation Dun Aquifere Libre En Hausse Au Sahel full books in PDF, epub, and Kindle. Read online Caracterisation Et Modelisation Dun Aquifere Libre En Hausse Au Sahel ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Caractérisation Et Modélisation D'un Aquifère Libre en Hausse Au Sahel by : Guillaume FAVREAU
Download or read book Caractérisation Et Modélisation D'un Aquifère Libre en Hausse Au Sahel written by Guillaume FAVREAU and published by Omniscriptum. This book was released on 2010-07 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: L''aquif re du Continental Terminal est tudi sur 4000 km2 pr s de Niamey. Une hausse de la nappe phr atique est observ e depuis >10 ans. L''objectif est d''expliquer cette hausse et de quantifier la recharge de l''aquif re. 150 chroniques pi zom triques et 50 chantillons d''eau de la nappe ont t analys s; une centaine de mesures pi zom triques des ann es 1950-80s ont t r - analys es. La hausse de la nappe est de 0,20 m/an et traduit une recharge >10 mm/an. L''augmentation des r serves de l''aquif re s''explique par le d boisement et l''encro tement des sols: dans un milieu o la recharge est localis e, le d boisement a provoqu un afflux d''eau aux mares de bas-fonds. La mod lisation de l''aquif re sugg re une recharge 1 mm/an sous v g tation naturelle; une autre estimation d duite des teneurs en C-14 du carbone inorganique dissous permet d''estimer la recharge long terme de 1 5 mm/an. Dans ce milieu sah lien, la recharge de la nappe a donc progress d''un facteur 10 (de 1 >10 mm/an) en quatre d cennies. Cette quantification de l''augmentation de la recharge provoqu e par la d forestation est une premi re en Afrique.
Book Synopsis Caractérisation et modélisation hydrogéologique d'un aquifère en milieu de socle fracturé by : Donissongou Dimitri Soro
Download or read book Caractérisation et modélisation hydrogéologique d'un aquifère en milieu de socle fracturé written by Donissongou Dimitri Soro and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le territoire burkinabè est constitué à plus de 80% de formations de socle. Ces formations renferment des ressources en eau souterraine qui constitue la seule source en eau potable de certaines populations. Cependant, le quart des forages réalisés en vue d'exploiter ces eaux sont négatifs. Une bonne compréhension du fonctionnement hydrogéologique et hydrodynamique des aquifères de socle qui sont très hétérogènes peut aider à résoudre ce problème. L'objectif de la thèse est de proposer un modèle conceptuel hydrogéologique en milieu de socle fracturé soudano-sahélien en combinant différentes méthodes hydrogéophysiques et hydrogéologiques classiques. Le site expérimental de Sanon (environ 14 km2) a été choisi comme site d'étude en raison de sa géologie qui est représentative de certaines formations de socle de l'Afrique de l'Ouest. Les résultats indiquent que le profil d'altération de Sanon est cohérent avec d'autres modèles proposés ces dernières années, suggérant que la conductivité hydraulique des aquifères de socle est une conséquence des processus d'altération plutôt que de la fracturation tectonique. Concernant les propriétés hydrodynamiques, une corrélation linéaire positive d'environ 80% a été obtenue entre les transmissivités et les paramètres RMP. La présence d'un dôme piézométrique dans la vallée centrale a été observée en toute saison. La recharge se fait directement au niveau de ce dôme piézométrique (11 et 13% de la pluie annuelle) et l'alimentation des zones périphériques se ferait plutôt par des transferts latéraux. L'ensemble des informations géologiques et hydrogéologiques a permis de faire une simulation numérique qui reproduit l'écoulement observé.
Book Synopsis Caractérisation et modélisaton d'une nappe phréatique en hausse au Sahel by : Guillaume Favreau
Download or read book Caractérisation et modélisaton d'une nappe phréatique en hausse au Sahel written by Guillaume Favreau and published by . This book was released on 2000 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA ZONE D'ETUDE SE SITUE A L'EST DE NIAMEY ET S'ETEND SUR PRES DE 4000 KM 2 DE L'AQUIFERE SABLO-SILTEUX DU CONTINENTAL TERMINAL. DEPUIS PLUS DE 10 ANS, LES SUIVIS PIEZOMETRIQUES MONTRENT UNE HAUSSE CONTINUE DE LA NAPPE PHREATIQUE. L'OBJECTIF DE L'ETUDE EST A LA FOIS D'EXPLIQUER CETTE HAUSSE INTERANNUELLE - D'ORIGINE CLIMATIQUE OU ANTHROPIQUE ? - ET DE QUANTIFIER L'EVOLUTION RECENTE DE LA RECHARGE. DANS CETTE OPTIQUE, PRES DE 150 CHRONIQUES PIEZOMETRIQUES (10000 MESURES) ET UNE CINQUANTAINE D'ECHANTILLONS GEOCHIMIQUES TYPIQUES DE LA NAPPE (IONS MAJEURS, 1 8O, 2H, 3H, 1 4C, 1 3C) SONT CONSIDERES ; A PLUS LONG TERME, UNE CENTAINE DE MESURES PIEZOMETRIQUES DES ANNEES 1950-80 ONT ETE RE-ANALYSEES. LA HAUSSE DE LA NAPPE EST EN MOYENNE DE 0,20 M.AN 1 SUR LA DERNIERE DECENNIE ET TRADUIT UNE RECHARGE D'AU MOINS 10 MM.AN 1. LES NIVEAUX ACTUELS SONT LES PLUS ELEVES JAMAIS MESURES, EN MOYENNE DE 3,5 M PLUS HAUTS QU'EN 1950-60. DEPUIS, DES SECHERESSES MAJEURES SE SONT PRODUITES (1970-80). L'AUGMENTATION DES RESERVES NE PEUT DONC S'EXPLIQUER QUE PAR LE DEBOISEMENT OBSERVE : DANS UN MILIEU ENDOREIQUE OU L'INFILTRATION A LA NAPPE S'EFFECTUE A TRAVERS LE FOND DES VALLEES, LE DEBOISEMENT A PROVOQUE UN ENCROUTEMENT DES SOLS ET UN AFFLUX D'EAU DE RUISSELLEMENT SUPPLEMENTAIRE AUX BAS-FONDS. A LONG TERME, DEUX APPROCHES INDEPENDANTES PERMETTENT DE QUANTIFIER LE RENOUVELLEMENT DE LA NAPPE. LA PREMIERE PROVIENT DE LA MORPHOLOGIE NATURELLE EN DEPRESSION DE LA PIEZOMETRIE, EXPLICABLE PAR UN DEFICIT LOCALISE INFILTRATION-EVAPOTRANSPIRATION ET DONT LA MODELISATION SUGGERE UNE RECHARGE REGIONALE PROCHE DU MM.AN 1. LA DEUXIEME EST DEDUITE DES TENEURS EN 3H ET 1 4C, QUI PERMETTENT D'ESTIMER LA RECHARGE A LONG TERME ENTRE 0,6 ET 5,0 MM.AN 1. DANS CE MILIEU TYPIQUEMENT SAHELIEN, LA RECHARGE DE LA NAPPE A DONC PROGRESSE D'UN FACTEUR 10 (DE 1 A PLUS DE 10 MM.AN 1) EN 4 DECENNIES. UNE TELLE QUANTIFICATION DE L'AUGMENTATION DE LA RECHARGE PROVOQUEE PAR LA DEFORESTATION EST UNE PREMIERE EN AFRIQUE.
Book Synopsis Impact of Human Activity on Groundwater Dynamics by : Hans Gehrels
Download or read book Impact of Human Activity on Groundwater Dynamics written by Hans Gehrels and published by . This book was released on 2001 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Mediterranean region under climate change by : Collectif
Download or read book The Mediterranean region under climate change written by Collectif and published by IRD Éditions. This book was released on 2018-11-19 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has been published by Allenvi (French National Alliance for Environmental Research) to coincide with the 22nd Conference of Parties to the United Nations Framework Convention on Climate Change (COP22) in Marrakesh. It is the outcome of work by academic researchers on both sides of the Mediterranean and provides a remarkable scientific review of the mechanisms of climate change and its impacts on the environment, the economy, health and Mediterranean societies. It will also be valuable in developing responses that draw on “scientific evidence” to address the issues of adaptation, resource conservation, solutions and risk prevention. Reflecting the full complexity of the Mediterranean environment, the book is a major scientific contribution to the climate issue, where various scientific considerations converge to break down the boundaries between disciplines.
Book Synopsis Hydrology of Mediterranean and Semiarid Regions by : Eric Servat
Download or read book Hydrology of Mediterranean and Semiarid Regions written by Eric Servat and published by . This book was released on 2003 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coviability of Social and Ecological Systems: Reconnecting Mankind to the Biosphere in an Era of Global Change by : Olivier Barrière
Download or read book Coviability of Social and Ecological Systems: Reconnecting Mankind to the Biosphere in an Era of Global Change written by Olivier Barrière and published by Springer. This book was released on 2019-03-12 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second volume is the work of more than 55 authors from 15 different disciplines and includes complex systems science which studies the viability of components, and also the study of empirical situations. As readers will discover, the coviability of social and ecological systems is based on the contradiction between humanity, which adopts finalized objectives, and the biosphere, which refers to a ecological functions. We see how concrete situations shed light on the coviability’s determinants, and in this book the very nature of the coviability, presented as a concept-paradigm, is defined in a transversal and ontological ways. By adopting a systemic approach, without advocating any economic dogma (such as development) or dichotomizing between humans and nature, while emphasizing what is relevant to humans and what is not, this work neutrally contextualizes man’s place in the biosphere. It offers a new mode of thinking and positioning of the ecological imperative, and will appeal to all those working with social and ecological systems.
Author :Food and Agriculture Organization of the United Nations Publisher :Food & Agriculture Org. ISBN 13 :9789250037271 Total Pages :352 pages Book Rating :4.0/5 (372 download)
Book Synopsis Irrigation in Africa in Figures by : Food and Agriculture Organization of the United Nations
Download or read book Irrigation in Africa in Figures written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 1995 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Water-resources Investigations Report by :
Download or read book Water-resources Investigations Report written by and published by . This book was released on 1992 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Orogenic Andesites and Plate Tectonics by : J. B. Gill
Download or read book Orogenic Andesites and Plate Tectonics written by J. B. Gill and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Students of a phenomenon as common but complex as andesite genesis often are overwhelmed by, or overlook, the volume and diversity of relevant information. Thus there is need for periodic overview even in the absence of a dramatic breakthrough which "solves the andesite problem" and even though new ideas and data keep the issues in a state of flux. Thus I have summarized the subject through mid·1980 from my perspective to help clarify the long-standing problem and to identify profitable areas for future research. Overviews are more easily justified than achieved and there are fundamental differences of opinion concerning how to go about them. It is professionally dangerous and therefore uncom mon for single authors, especially those under 35 such as I, to summarize a broad, active field of science in book-length thor oughness. Review articles in journals, multi-authored books, or symposia proceedings appear instead. The single-authored approach is intimidating in scale and can result in loss of thoroughness or authority on individual topics. The alternatives lack scope or integration or both.
Download or read book El Niño written by Bruno Voituriez and published by UNESCO. This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Book Synopsis River Basin Trajectories by : François Molle
Download or read book River Basin Trajectories written by François Molle and published by IWMI. This book was released on 2009 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains 11 papers which cover a range of vital topics in the areas of water, agriculture, food security and ecosystems - the entire spectrum of developing and managing water in agriculture, from fully irrigated to fully rainfed lands. They are about people and society, why they decide to adopt certain practices and not others and, in particular, how water management can help poor people. They are about ecosystems - how agriculture affects ecosystems, the goods and services ecosystems provide for food security and how water can be managed to meet both food and environmental security objectives. This is the eighth book in the series.
Download or read book Soil Analysis written by J. Gautheyrou and published by CRC Press. This book was released on 2001-01-01 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to provide a better understanding of tools for soil analysis in order to use them more efficiently. It covers sampling problems as well as difficulties relating to actual analysis and quality control.
Author :International Livestock Research Institute Publisher :ILRI (aka ILCA and ILRAD) ISBN 13 :9789291460038 Total Pages :268 pages Book Rating :4.4/5 (6 download)
Book Synopsis Livestock Policy Analysis by : International Livestock Research Institute
Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Book Synopsis Climate Change Effects on Groundwater Resources by : Holger Treidel
Download or read book Climate Change Effects on Groundwater Resources written by Holger Treidel and published by CRC Press. This book was released on 2011-12-02 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change is expected to modify the hydrological cycle and affect freshwater resources. Groundwater is a critical source of fresh drinking water for almost half of the worlds population and it also supplies irrigated agriculture. Groundwater is also important in sustaining streams, lakes, wetlands, and associated ecosystems. But despite this,
Book Synopsis Solid-Earth Sciences and Society by : National Research Council
Download or read book Solid-Earth Sciences and Society written by National Research Council and published by National Academies Press. This book was released on 1993-02-01 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: As environmental problems move upward on the public agenda, our knowledge of the earth's systems and how to sustain the habitability of our world becomes more critical. This volume reports on the state of earth science and outlines a research agenda, with priorities keyed to the real-world challenges facing human society. The product of four years of development with input from more than 200 earth-science specialists, the volume offers a wealth of historical background and current information on: Plate tectonics, volcanism, and other heat-generated earth processes. Evolution of our global environment and of life itself, as revealed in the fossil record. Human exploitation of water, fossil fuels, and minerals. Interaction between human populations and the earth's surface, discussing the role we play in earth's systems and the dangers we face from natural hazards such as earthquakes and landslides. This volume offers a comprehensive look at how earth science is currently practiced and what should be done to train professionals and adequately equip them to find the answers necessary to manage more effectively the earth's systems. This well-organized and practical book will be of immediate interest to solid-earth scientists, researchers, and college and high school faculty, as well as policymakers in the environmental arena.
Book Synopsis Biodiversity and Sustainable Development by : Rabindra Nath Pati
Download or read book Biodiversity and Sustainable Development written by Rabindra Nath Pati and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the First Global Summit on Sustainable Development and Biodiversity, held at Raipur during 7-9 February 2009.
