Download or read book Application du syst me d information g ographique dans la mod lisation de l rosion hydrique written by and published by . This book was released on 2012 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mod lisation de l rosion hydrique par int gration de donn es multisources un syst me d information g ographique microforme written by Daniel Baril and published by Bibliothèque nationale du Canada. This book was released on 1989 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Utilisation D un SIG en Mode Raster Pour la Spatialisation Du Bilan Hydrique L chelle Mensuelle written by Steeve Ebener and published by . This book was released on 2000 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le présent travail traite du développement d'une approche permettant la spatialisation du bilan hydrique à l'échelle du bassin versant en utilisant les Systèmes d'Information Géoréféré (SIG). Cette spatialisation passe par la connaissance de la répartition de l'intensité des différents processus suivants : les précipitations, l'interception, l'infiltration, le ruissellement et l'évapotranspiration. L'échelle temporelle retenue est le mois, afin d'appréhender la variabilité de l'intensité des différents flux. Une maille très fine de résolution de 25 mètres a permis de modéliser spatialement les différentes variables retenues en mode raster. Le mode vecteur a été utilisé afin d'obtenir une grande précision lors de la création des différents documents constituant ainsi la base de données. Les outils SIG principalement employés dans le cadre de cette étude sont les logiciels IDRISI, ARC/INFO et ArcView. Le basin versant de l'Allondon, situé au nord-ouest de Genève, a été choisi afin de tester l'applicabilité de cette approche.
Download or read book Application des S I G Syst mes d information g ographique l tude de l impact de la voirie et des structures lin aires sur l coulement et l rosion hydrique des sols viticoles de Champagne written by Hassane Sebbab and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Le problème essentiel des viticulteurs et des collectivités en vignoble champenois correspond à la dégradation des chemins en périodes d'averse et aux conséquences économiques infligées aux coûts de la prodution. Il s'agit donc d'intégrer dans l'étude de l'érosion la voirie et les micro-formes géomorphologiques intervenant dans la cumulation des flux. Pour ce faire une méthode utilisant le système d'information géographique (S.I.G.) "SynerGIS" est mise au point. Cette méthode a été appliquée sur un bassin versant viticole, de 47,4 ha de superficie et d'un taux d'occupation de sol par la voirie de 10,8 %. La démarche consiste dans un premier temps d'utiliser un modèle numérique de terrain M.N.T. à pas fin (métrique) Ensuite, des cartes modèles des facteurs prégnants dans l'érosion sont réalisés (pentes, courbure de la surfac e topographique du sol et érosivité du ruissellement). La modification de chacun de ces facteurs par la voirie a été défini. Le croisement de ces facteurs modifié par la voirie aboutit à une carte modèle d'áléa érosion hydrique et exprimant l'effet de la voirie sur l'érosion hydrique. La confrontation des deux modèles, sans et avec voirie, a permis de définir son impact sur les écoulements d'eau superficiels et sur l'érosion hydrique. Le modèle a été validé sur le terrain. La voirie a limité la longueur de la pente du versant et elle a entraîné un découpage des caractéristiques physiques du sol par ces revêtements. Elle a modifié les trajectoires d'écoulements, en effet, elles suivent désormais le réseau linéaire et non pas les talwegs, et par la suite, la voirie assure un effet toboggan pour les eaux pluviales. La voirie provoque aussi une redistribution spatiale de l'érosivité du ruissellement. En changeant les facteurs naturels du bassin la voirie a donc modifié l'effet du versant. A l'échelle du bassin versant la voirie a réduit la sensibilité à l'érosion sur les parcelles. Par ailleurs, elle a augmenté le ravinement sur son réseau.
Download or read book Landscape Ecology in Agroecosystems Management written by Lech Ryszkowski and published by CRC Press. This book was released on 2001-12-27 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Successful management of agricultural landscapes depends on the recognition of the relationships between the processes and the structures that maintain the system. The rapidly growing science of Landscape Ecology quantifies the ways these ecosystems interact and establishes a link between the activities in one region and repercussions in another. A
Download or read book Farm Land Erosion written by S. Wicherek and published by Elsevier. This book was released on 2012-12-02 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the last twenty years, mutations within agricultural systems in France and Europe have brought on a spectacular worsening of soil erosion and degradation. This volume, contributed to by scientists from 25 countries, discusses how this risk can be evaluated, and which solutions should be adopted without radically disturbing the socio-economic orientation of major agricultural regions. It is an excellent starting point for the development of new research themes, and will be of great value to soil and environmental scientists, and to all those involved in land irrigation and drainage.
Download or read book Mededelingen written by and published by . This book was released on 2000 with total page 1152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Genesis and Classification written by S. W. Buol and published by Iowa State Press. This book was released on 1973 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Morphology of soils; Soil micromorphology; Soil composition and characterization; Weathering and soil formation; Pedogenic processes: internal, soil-building processes; Soil environment: External factors of soil formation; Parent material: initial material of the solum; Relief and landscape factors of the soil and its environment; Contributions of climate to the total soil environment; Organisms: biological portion of the soil and its environment; Time as a factor of soil formation; Principles and historical development of soil classification; Modern soil classification systems; Entisols:recently formed soils: Vertisols: shrinking and swelling dark clay soils; In ceptisols: emleryonic soils with few diagnostic features; Aridisols: soils of arid regions; Mollisols: grassland soils of steppes and prairies; Spodosols: soils with subsoil, accumulations of sesquioxide and humus; Alfisols:high base status soils; Ultisols: low base status forest soils: Oxisols: sesquioxide - rihch, highly weathered soils of the intertropical regions; Histosols: organic soils.
Download or read book World reference base for soil resources 2014 written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2018-07-20 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is a revised and updated version of World Soil Resources Reports No. 84 and 103 and presents the international soil classification system. Every soil in the world can be allocated to one of the 32 Reference Soil Groups as defined in this document, and can further be characterized by a set of qualifiers. The resulting soil name provides information on soil genesis, soil ecological function and soil properties relevant for land use and management. The same system, refined slightly, may be used to name the units of soil map legends, thereby providing comprehensive spatial information. By accommodating national soil classification systems, the World Reference Base facilitates the worldwide correlation of soil information.
Download or read book Modeling and Practice of Erosion and Sediment Transport under Change written by Mohamed Meddi and published by MDPI. This book was released on 2019-09-17 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate and anthropogenic changes impact the conditions of erosion and sediment transport in rivers. Rainfall variability and, in many places, the increase of rainfall intensity have a direct impact on rainfall erosivity. Increasing changes in demography have led to the acceleration of land cover changes in natural areas, as well as in cultivated areas, and, sometimes, in degraded areas and desertified landscapes. These anthropogenized landscapes are more sensitive to erosion. On the other hand, the increase in the number of dams in watersheds traps a great portion of sediment fluxes, which do not reach the sea in the same amount, nor at the same quality, with consequences on coastal geomorphodynamics. This book is dedicated to studies on sediment fluxes from continental areas to coastal areas, as well as observation, modeling, and impact analysis at different scales from watershed slopes to the outputs of large river basins. This book is concentrated on a number of keywords: “erosion” and “sediment transport”, “model” and “practice”, and “change”. The keywords are briefly discussed with respect to the relevant literature. The contributions in this book address observations and models based on laboratory and field data, allowing researchers to make use of such resources in practice under changing conditions.
Download or read book Predicting Soil Erosion by Water written by Kenneth G. Renard and published by . This book was released on 1997 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and history; Rainfall-runoff erosivity factor (R); Soil erodibility factor (K); Slope length and steepness factors (LS); Cover-management factor (C); Support practice factor (P); RUSLE user guide; Coversion to SI metric system; Calculation of EI from recording-raingage records; Estimating random roughness in the field; Parameter values for major agricultural crops and tillage operations.
Download or read book Predicting Rainfall Erosion Losses written by Walter H. Wischmeier and published by . This book was released on 1978 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Universal Soil Loss Equation (USLE) enables planners to predict the average rate of soil erosion for each feasible alternative combination of crop system and management practices in association with a specified soil type, rainfall pattern, and topography. When these predicted losses are compared with given soil loss tolerances, they provide specific guidelines for effecting erosion control within specified limits. The equation groups the numerous interrelated physical and management parameters that influence erosion rate under six major factors whose site-specific values can be expressed numerically. A half century of erosion research in many States has supplied information from which at least approximate values of the USLE factors can be obtained for specified farm fields or other small erosion prone areas throughout the United States. Tables and charts presented in this handbook make this information readily available for field use. Significant limitations in the available data are identified.
Download or read book Soil Erosion and Carbon Dynamics written by Eric J. Roose and published by CRC Press. This book was released on 2005-12-09 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most complete, nonpartisan source of information on this hot agronomic topic available today, this book brings together a diverse group of papers and data to resolve the debate between sedimentologists and soil scientists and agronomists over whether the effects of soil erosion on carbon and atmospheric CO2 is beneficial or destructive. Divided into four sections, it offers data on how soil erosion affects soil, water, and air quality. Topics include mineralization rate, inundation, sediment deposition, and global warming potential, as well as carbon dioxide, methane, and nitrous oxide emissions, and the implications of soil erosion on the global carbon cycle and carbon budget.
Download or read book Assessment of Erosion written by M. de Boodt and published by John Wiley & Sons. This book was released on 1980 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Francis bibliographie g ographique internationale written by and published by . This book was released on 1994 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lake Pavin written by Télesphore Sime-Ngando and published by Springer. This book was released on 2016-10-31 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the first multidisciplinary scientific work on a deep volcanic maar lake in comparison with other similar temperate lakes. The syntheses of the main characteristics of Lake Pavin are, for the first time, set in a firmer footing comparative approach, encompassing regional, national, European and international aquatic science contexts. It is a unique lake because of its permanently anoxic monimolimnion, and furthermore, because of its small surface area, its substantially low human influence, and by the fact that it does not have a river inflow. The book reflects the scientific research done on the general limnology, history, origin, volcanology and geological environment as well as on the geochemistry and biogeochemical cycles. Other chapters focus on the biology and microbial ecology whereas the sedimentology and paleolimnology are also given attention. This volume will be of special interest to researchers and advanced students, primarily in the fields of limnology, biogeochemistry, and aquatic ecology.
Download or read book Groundwater Modelling in Arid and Semi Arid Areas written by Howard S. Wheater and published by Cambridge University Press. This book was released on 2010-09-09 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Arid and semi-arid regions face major challenges in the management of scarce freshwater resources under pressures of population, economic development, climate change, pollution and over-abstraction. Groundwater is commonly the most important water resource in these areas. Groundwater models are widely used globally to understand groundwater systems and to guide decisions on management. However, the hydrology of arid and semi-arid areas is very different from that of humid regions, and there is little guidance on the special challenges of groundwater modelling for these areas. This book brings together the experience of internationally leading experts to fill a gap in the scientific and technical literature. It introduces state-of-the-art methods for modelling groundwater resources, illustrated with a wide-ranging set of illustrative examples from around the world. The book is valuable for researchers, practitioners in developed and developing countries, and graduate students in hydrology, hydrogeology, water resources management, environmental engineering and geography.
