SIMULATION NUMERIQUE DE LA POLLUTION DU SOUS-SOL PAR LES PRODUITS PETROLIERS ET DERIVES PDF Download
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Author: DHARUMARAJEN.. NAYAGUM
Publisher:
ISBN:
Category :
Languages : fr
Pages : 158
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Book Description
UN MODELE NUMERIQUE DIPHASIQUE INCOMPRESSIBLE EST PRESENTE. CE CODE DE CALCUL PERMET DE SIMULER LA MIGRATION D'UNE PHASE NON AQUEUSE DANS LA ZONE SATUREE AINSI QUE L'INFILTRATION D'EAU DANS LA ZONE NON SATUREE EN CONSIDERANT LA PHASE AIR COMME ETANT INFINIMENT MOBILE. LA FORMULATION D'ECOULEMENT FRACTIONNEL ADOPTEE DECRIT LE SYSTEME DIPHASIQUE PAR DEUX EQUATIONS, L'UNE EN PRESSION MOYENNE DES DEUX PHASES ET L'AUTRE EN SATURATION EN EAU. DEUX METHODES NUMERIQUES ADAPTEES AUX TYPES D'EQUATIONS ONT ETE IMPLEMENTEES : LES ELEMENTS FINIS MIXTES HYBRIDES (EFMH) POUR TRAITER LA DIFFUSION ET LES ELEMENTS FINIS DISCONTINUS POUR RESOUDRE LA CONVECTION. LE MODELE NUMERIQUE DEVELOPPE EST TESTE PAR CONFRONTATION A DES SOLUTIONS ANALYTIQUES ET A D'AUTRES MODELES POUR DIFFERENTES CONFIGURATIONS MONODIMENSIONNELLES. NOUS MONTRONS QUE LES SCHEMAS NUMERIQUES UTILISES SONT ROBUSTES. UNE NOUVELLE APPROXIMATION DU COEFFICIENT DE DIFFUSION EST PROPOSEE. CETTE APPROXIMATION PERMET DE MIEUX SIMULER LES ECOULEMENTS DOMINES PAR LA DIFFUSION. EN MILIEU HETEROGENE, LA SATURATION DEVIENT UNE VARIABLE DISCONTINUE A LA LIMITE ENTRE DEUX MILIEUX POREUX. CE SAUT DE LA SATURATION NOUS AMENE A INTRODUIRE UNE CONDITION NON USUELLE DE RACCORDEMENT DANS LES EFMH.
Author: DHARUMARAJEN.. NAYAGUM
Publisher:
ISBN:
Category :
Languages : fr
Pages : 158
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Book Description
UN MODELE NUMERIQUE DIPHASIQUE INCOMPRESSIBLE EST PRESENTE. CE CODE DE CALCUL PERMET DE SIMULER LA MIGRATION D'UNE PHASE NON AQUEUSE DANS LA ZONE SATUREE AINSI QUE L'INFILTRATION D'EAU DANS LA ZONE NON SATUREE EN CONSIDERANT LA PHASE AIR COMME ETANT INFINIMENT MOBILE. LA FORMULATION D'ECOULEMENT FRACTIONNEL ADOPTEE DECRIT LE SYSTEME DIPHASIQUE PAR DEUX EQUATIONS, L'UNE EN PRESSION MOYENNE DES DEUX PHASES ET L'AUTRE EN SATURATION EN EAU. DEUX METHODES NUMERIQUES ADAPTEES AUX TYPES D'EQUATIONS ONT ETE IMPLEMENTEES : LES ELEMENTS FINIS MIXTES HYBRIDES (EFMH) POUR TRAITER LA DIFFUSION ET LES ELEMENTS FINIS DISCONTINUS POUR RESOUDRE LA CONVECTION. LE MODELE NUMERIQUE DEVELOPPE EST TESTE PAR CONFRONTATION A DES SOLUTIONS ANALYTIQUES ET A D'AUTRES MODELES POUR DIFFERENTES CONFIGURATIONS MONODIMENSIONNELLES. NOUS MONTRONS QUE LES SCHEMAS NUMERIQUES UTILISES SONT ROBUSTES. UNE NOUVELLE APPROXIMATION DU COEFFICIENT DE DIFFUSION EST PROPOSEE. CETTE APPROXIMATION PERMET DE MIEUX SIMULER LES ECOULEMENTS DOMINES PAR LA DIFFUSION. EN MILIEU HETEROGENE, LA SATURATION DEVIENT UNE VARIABLE DISCONTINUE A LA LIMITE ENTRE DEUX MILIEUX POREUX. CE SAUT DE LA SATURATION NOUS AMENE A INTRODUIRE UNE CONDITION NON USUELLE DE RACCORDEMENT DANS LES EFMH.
Author: Gabriela Alina Brusturean
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Le travail de cette thèse concerne l'étude expérimentale, la modélisation et la simulation numérique de la dépollution par venting et SVE des sols pollués par des hydrocarbures légers. Une première partie contient une étude bibliographique de l'interaction des polluants avec le sol, les applications industrielles de ces deux techniques et des techniques de modélisation du suivi de la dépollution. La deuxième partie est constituée de la présentation des montages et techniques opératoires utilisés pour le suivi de la dépollution sur des pilotes de laboratoire. La troisième partie présente les résultats obtenus sur des sols pollués par des composants de carburant automobile seuls ou en mélange avec des conditions opératoires (débit gazeux, pression d'extraction, temps de vieillissement de la pollution). L'accord entre l'expérience et la modélisation (chiffré par des facteurs de concordance) est bon ce qui permettra d'utiliser les techniques de calcul mises au point pour une optimisation des conditions de dépollution.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Bruno Voituriez
Publisher: UNESCO
ISBN:
Category : Science
Languages : en
Pages : 132
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Book Description
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.
Author:
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 184
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Book Description
Author: John Henry Lorentz
Publisher: Historical Dictionaries of Asia, Oceania, and the Middle East
ISBN:
Category : History
Languages : en
Pages : 570
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Book Description
Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
Author: Jürgen Runge
Publisher: CRC Press
ISBN: 1000431150
Category : Science
Languages : en
Pages : 412
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Book Description
This book celebrates the relaunch of the African Pollen Database, presents state-of-the-art of modern and ancient pollen data from sub-Saharan Africa, and promotes Open Access science. Pollen grains are powerful tools for the study of past vegetation dynamics because they preserve well within sedimentary deposits and have a huge diversity in ornamentation that allows different taxa to be determined. The reconstruction of past vegetation from the examination of ancient pollen records thus can be used to characterize the nature of past landscapes (e.g. abundance of forests vs. grasslands), provide insights into changes in biodiversity, and gain empirical evidence of vegetation response to climatic change and human activity. In this, the 35th Volume of "Palaeoecology of Africa", we bring together new data and extensive synthetic reviews to provide novel insights into the relationships between human evolution, human activity, climate change and vegetation dynamics during the Quaternary, the last 2.6 million years. Current and ongoing climate and land-use change is exerting pressure on modern vegetation formations and threatening the livelihoods and wellbeing of many peoples in Africa. In this book the focus is on the Quaternary because it is during this geological period that the modern vegetation formations developed into their current configurations against a backdrop of high magnitude global climate change (glacial-interglacial cycles), human evolution, and a growing human land-use footprint. In this book the latest information is presented and collated from around the African continent to parameterize past vegetation states, identify the drivers of vegetation change, and assess the vegetation resilience to change. To achieve this research from two broad themes are covered: (i) the present is the key to the past (i.e. studies which improve our understanding of modern environments so that we can better interpret evidence from the past), and (ii) the past is the key to the future (i.e. studies which unlock information on how and why vegetation changed in the past so one can better anticipate trajectories of future change). This Open Access book will provide a strong foundation for future research exploring past ecological, environmental and climatic change within Africa and the surrounding islands. The book is organized regionally (covering western, eastern, central, and southern Africa) and it contains specialized articles focused on particular topics (such as modern pollen-vegetation relationships and fire as a driver of vegetation change), as well as regional and pan-African syntheses drawing together decades of research to assess key scientific questions (including the role of climate in driving vegetation change and the role of vegetation change in human evolution). These articles will be useful to students and teachers from high school to the highest level of university who are interested in the origins and dynamics of vegetation in Africa. Furthermore, it is also meant to provide societally relevant information that can act as an inspiration for the development of sustainable management practices for the future.
Author: Desmond Ball
Publisher:
ISBN:
Category : Political Science
Languages : en
Pages : 56
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Book Description
Amerikanske synspunkter, som de har udviklet sig, vedrørende anvendelsen af atomvåben.
Author: Organisation for Economic Co-operation and Development
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 94
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Book Description
Author: Malcolm D Bolton
Publisher: Universities Press
ISBN: 9788173714252
Category : Soil mechanics
Languages : en
Pages : 464
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Book Description
Covers all the soil mechanics and foundation engineering topics that are commonly included in civil engineering degree courses, and provides a number of springboards into related advanced topics. Although it is intended principally to satisfy the needs of student civil engineers, this guide should also prove useful to those practicing engineers who are unaware of the powerful and elegant reconstruction of the subject which has been made possible by the recent concepts of plasticity, dilatancy and critical states.
