The Influence Of Turbulence On Soil Erosion
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The Influence Of Turbulence On Soil Erosion
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Author : Gijs J. C. M. Hoffmans
language : en
Publisher: Eburon Uitgeverij B.V.
Release Date : 2012
The Influence Of Turbulence On Soil Erosion written by Gijs J. C. M. Hoffmans and has been published by Eburon Uitgeverij B.V. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Scour (Hydraulic engineering). categories.
This publication outlines the relevance of turbulence on the initiation of motion of soil and explains the interaction between the load and the resistance against erosion or the strength of the bed material. The stability of stones, sand, clay and grass is discussed by using Newton’s second law and a definition of the turbulence energy. Usually the equilibrium scour depth caused by jets and at piers/abutments is predicted by applying empirical relations. This publication discusses a scour approach which is based on two steps. First, a control volume that represents the scour hole is considered. Secondly, the relevant forces are determined. Newton’s second law is applied, that is, the sum of forces equals zero since the scour hole is in equilibrium. This approach is discussed for different types of jet scour and scouring downstream of sills and near bridge piers and abutments.
River Flow 2016
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Author : George Constantinescu
language : en
Publisher: CRC Press
Release Date : 2016-06-22
River Flow 2016 written by George Constantinescu and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-22 with Technology & Engineering categories.
Understanding and being able to predict fluvial processes is one of the biggest challenges for hydraulics and environmental engineers, hydrologists and other scientists interested in preserving and restoring the diverse functions of rivers. The interactions among flow, turbulence, vegetation, macroinvertebrates and other organisms, as well as the transport and retention of particulate matter, have important consequences on the ecological health of rivers. Managing rivers in an ecologically friendly way is a major component of sustainable engineering design, maintenance and restoration of ecological habitats. To address these challenges, a major focus of River Flow 2016 was to highlight the latest advances in experimental, computational and theoretical approaches that can be used to deepen our understanding and capacity to predict flow and the associated fluid-driven ecological processes, anthropogenic influences, sediment transport and morphodynamic processes. River Flow 2016 was organized under the auspices of the Committee for Fluvial Hydraulics of the International Association for Hydro-Environment Engineering and Research (IAHR). Since its first edition in 2002, the River Flow conference series has become the main international event focusing on river hydrodynamics, sediment transport, river engineering and restoration. Some of the highlights of the 8th International Conference on Fluvial Hydraulics were to focus on inter-disciplinary research involving, among others, ecological and biological aspects relevant to river flows and processes and to emphasize broader themes dealing with river sustainability. River Flow 2016 (extended abstract book 854 pages + full paper CD-ROM 2436 pages) contains the contributions presented during the regular sessions covering the main conference themes and the special sessions focusing on specific hot topics of river flow research, and will be of interest to academics interested in hydraulics, hydrology and environmental engineering.
Scour Manual
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Author : G.J.C.M. Hoffmans
language : en
Publisher: CRC Press
Release Date : 2021-03-08
Scour Manual written by G.J.C.M. Hoffmans and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-08 with Technology & Engineering categories.
Ever since the publication in 1997 the original Scour Manual has helped many practising hydraulic engineers to deal with scour processes near hydraulic structures. In recent years new insights, such as probabilistic calculations, offered new opportunities to design structures more economically. These new insights are included in this update of the original Scour Manual, which is focussing entirely on current-related scour. This manual provides the engineer with useful practical methods to calculate the dimensions of scour holes in the pre-feasibility and preliminary stages of a project, and gives an introduction to the most relevant literature. This updated Scour Manual contains guidelines that can be used to solve problems related to scour in engineering practice and also reflects the main results of all research projects in the Netherlands in recent decades. The so-called Breusers equilibrium method has a central role, which can basically be applied to all situations where local scour is expected. The method allows to predict the scour depth as a function of time, provided that the available knowledge about scour at the specific structure is sufficient. For structures with insufficient knowledge available, alternative scour prediction rules are presented. The treatment of local scour is classified according to the different types of structures. Each type of structure is necessarily schematised to a simple, basic layout. The main parameters of a structure and the main parts of the flow pattern near a structure are described briefly insofar they are relevant to the description of scour phenomena. New scour formulas for the equilibrium scour have been elucidated. Evaluating a balance of forces for a control volume, it is possible to develop scour equations for different types of flow fields and structures, i.e. jets, abutments and bridge piers. As many scour problems are still not fully understood, attention is paid to the validity ranges and limitations of the formulas, as well as to the accuracy of the scour predictions. This information can also be used to carry out a risk assessment using a safety philosophy based on a probabilistic analysis or an approach with a safety factor. Moreover, the information on the strength of soils is extended and aspects are addressed such as scour due to shear failures or flow slides, that can progressively damage the bed protection which might lead to the failure of hydraulic structures. This updated Scour Manual presents scour prediction methods and deals with practically related scour problems. Consultants and contractors were invited to provide case studies of realized projects, including the methods that were followed. These case studies will help with grasping the concept of scour by the flow of water. This manual provides the engineer with the latest knowledge and with case studies that show how to apply the formulas and their limitations.
Biological Effects In The Hydrological Cycle
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Author : Edwin John Monke
language : en
Publisher:
Release Date : 1971
Biological Effects In The Hydrological Cycle written by Edwin John Monke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Hydrologic cycle categories.
Informatics Networking And Intelligent Computing
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Author : Jiaxing Zhang
language : en
Publisher: CRC Press
Release Date : 2015-05-06
Informatics Networking And Intelligent Computing written by Jiaxing Zhang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-06 with Computers categories.
This proceedings volume contains selected papers presented at the 2014 International Conference on Informatics, Networking and Intelligent Computing, held in Shenzhen, China. Contributions cover the latest developments and advances in the field of Informatics, Networking and Intelligent Computing.
Soil Erosion
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Author : Terrence J. Toy
language : en
Publisher: John Wiley & Sons
Release Date : 2002-05-27
Soil Erosion written by Terrence J. Toy and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-05-27 with Technology & Engineering categories.
- Problem der Bodenerosion wird hier mit ganzheitlichem Ansatz besprochen - Ursachen und Auswirkungen der Erosion werden in sozialökonomischen Kontext gebracht - ausführliche Angaben über Methoden der Verfolgung von Bodenerosion (GPS, GIS, Erdfernerkundung) - mit einer gut verständlichen allgemeinen Einführung in Bodenkunde und Hydrologie
Ground Freezing Effects On Soil Erosion Of Army Training Lands
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Author : Lawrence W. Gatto
language : en
Publisher:
Release Date : 1997
Ground Freezing Effects On Soil Erosion Of Army Training Lands written by Lawrence W. Gatto and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Frozen ground categories.
Ground Freezing Effects On Soil Erosion Of Army Training Lands Part 1 Initial Test Results
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 1997
Ground Freezing Effects On Soil Erosion Of Army Training Lands Part 1 Initial Test Results written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Military maneuvers damage vegetation and compact and rut soils on training lands, thereby increasing the likelihood of hillslope runoff and soil erosion. Soil Freeze-Thaw (FT) processes can change the hydraulic geometry and roughness of vehicular ruts and reduce soil compaction, which often partially restores the water infiltration rate that existed before compaction. The efficiency of these FT-induced 'repairs' depends on soil water content and FT intensity. Initial tests showed that: (1) an experimental soil bin designed and constructed for rut experiments allows acceptable simulation of field soil FT, and (2) the hydraulic geometry of a rectangular rill in a fine silt soil with an initial volumetric water content of 36% changes dramatically due to rill sideslope slumping during thaw. Future experiments will compare differences in the response of natural rills and vehicular ruts to FT-induced soil failure, and investigate the effects of FT on soil erodibility and the influences of snow cover on soil erosion processes in the spring.
Soil Erosion
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Author : Arthur J. Fournier
language : en
Publisher:
Release Date : 2011
Soil Erosion written by Arthur J. Fournier and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Soil erosion categories.
Soil erosion is perceived as a major and widespread form of soil degradation and it has large environmental and economic impacts at different scales, especially in agricultural areas. Even though erosion originally is a natural process, influenced by physical factors, current human interventions in the landscape often accelerate natural erosion rates tremendously. Consequently, social, economic and political factors are decisive in determining soil erosion risk. This book gathers and presents current research from around the globe in the study of soil erosion, including research on erosion measurements and estimates with reference to water erosion in mountain environments; radiocaesium as a tool of erosion studies; and mitigation strategies to counteract soil erosion.
Water Resources Research Catalog
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Author :
language : en
Publisher:
Release Date : 1966
Water Resources Research Catalog written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Water resources development categories.