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Author : T. Tsujimoto
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)
Download or read book Non-equilibrium Sediment Transport written by T. Tsujimoto and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Weiming Wu
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Non-equilibrium Sediment Transport Modeling written by Weiming Wu and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alejandro Sanchez
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (728 download)
Download or read book A Non-equilibrium Sediment Transport Model for Coastal Inlets and Navigation Channels written by Alejandro Sanchez and published by . This book was released on 2011 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jean-Fernand Krou
Publisher :
ISBN 13 :
Total Pages : 600 pages
Book Rating : 4.:/5 (77 download)
Download or read book Two-dimensional Modeling of Flow Field and Non-equilibrium Sediment Transport Over Irregular Domains and Topographies written by Jean-Fernand Krou and published by . This book was released on 2010 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kara Carr
Publisher :
ISBN 13 : 9781303537875
Total Pages : pages
Book Rating : 4.5/5 (378 download)
Download or read book Scaling of One-dimensional Non-equilibrium Sediment Transport While Maintaining Material Properties written by Kara Carr and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The governing physical process of sediment transport can be represented in a scale model without the simplifying assumptions required in numerical modeling. However, the current methods utilized in scaling sediment transport in unsteady open-channel flow result in a number of model and scale effects, which decrease the accuracy and application of scale models. Commonly, researchers apply Froude similitude, vertical distortion by scaling channel width and depth differently, and scaled sediment density to sediment transport models. These practices result in: bank inclination angles which are not conserved, errors in secondary current representation in the model, velocity distortion, inaccurate representation in the location and extent of erosion and deposition, inaccurate bed-porosity, inaccurate description of incipient motion, and dissimilar suspended sediment concentration. A number of criteria for sediment transport scaling are available that aim to decrease the error that results from scaling flow and sediment transport processes. These criteria often solve one issue of similitude in scale models, while simultaneously decreasing similitude of another flow or sediment transport parameter. For example, the scaling of sediment density is a common solution when scaling of the sediment diameter alone would result in cohesive sediments with fundamentally different behavior from non-cohesive sediment. Scaling of the sediment density may increase the similitude of the particle Reynolds number. However, the lighter sediments cause an over-estimation of suspended sediment concentration, and an accelerated time scale for bed deformation. The implications of these errors are not trivial in light of the goal of physical scale modeling to represent prototype conditions accurately enough to use scale models as tools for design and performance prediction, and environmental impact assessment.I propose the use of the one-parameter Lie group of point scaling transformations as a method of scaling sediment transport without the errors encountered in traditional scaling methods. The conditions under which the governing equation for non-equilibrium sediment transport in unsteady flows is self-similar are examined by applying the one-parameter Lie group of point scaling transformations. The conditions are further examined to determine the case in which the sediment material properties need not be scaled. It is proposed that channel depth and width be scaled equally, and the scaling ratio of channel length should equal the square of the scaling ratio of channel depth. The proposed method is compared to the traditional method of vertically distorted Froude similitude and sediment transport scaling. It is shown that under Lie group scaling, the unsteady suspended sediment transport process as an initial- boundary value problem in the prototype domain, can be self-similar with that of a variety of different scaled domains. The scaled values of flow and sediment variables at specified temporal and spatial locations can then be upscaled to the corresponding values in the prototype domain with little to no scale effect. When the geometric scaling is set as I propose, not only are sediment diameter and density unscaled, but so too are the critical and total shear, kinematic viscosity and particle Reynolds number. The similarity of sediment transport is increased through more accurate representation of incipient motion, the time-rate of change of bed morphology, bed porosity, suspended sediment concentration and carrying capacity of flow. The proposed method, detailed herein, meets the needs of modelers by maintaining the benefits found from distortion such as reduced cost, space and model run-time, while simultaneously avoiding the scale effects and resulting errors of traditional flow and sediment transport scaling.
Author : P. K. Ghimire
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (637 download)
Download or read book Non-equilibrium sediment transport in irrigation canals written by P. K. Ghimire and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jiaheng Zhao
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book A Novel Slope Failure Operator for a Non-Equilibrium Sediment Transport Model written by Jiaheng Zhao and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Qiwei Han
Publisher : Springer
ISBN 13 : 9789819711222
Total Pages : 0 pages
Book Rating : 4.7/5 (112 download)
Download or read book Non-equilibrium Transport of Non-uniform Suspended Load written by Qiwei Han and published by Springer. This book was released on 2024-05-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is based on stochastic theory of sediment motion, particularly the theory of transition intensities. It provides a complete theory and equation system of non-equilibrium transport of non-uniform suspended load. The content proposed theory reports, for the first time in literature, the general boundary condition of diffusion equations of non-equilibrium transport with transition intensities. The book also introduces the theoretical expressions of size distribution of the carrying sediment capacity, efficient bed material grade, and saturation recovery coefficient This book describes the application of non-equilibrium transport theory and provides solutions to some long-standing unsolved controversial problems related to sediment transport. It establishes a generic mathematic model of reservoir sedimentation and river channel evolution; illustrates the same transport regulars of wash load and bed material load; demonstrates the multi-valued nature of carrying-sediment capacity and its single-valued consideration; and describes the mechanism of bed material coarsening. This book is of interest to a wide audience including students, technicians, and academics, primarily working in the field of river hydra-dynamics. In addition, this book receives attention from the research community working in fields, such as hydrogeology, hydraulic engineering, river navigation, wastewater treatment, and environmental protection
Author : Zheng "Ken." Kuai
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (83 download)
Download or read book Non-uniform Sediment Transport and Time Scale Analysis in Unsteady and Non-equilibrium Conditions written by Zheng "Ken." Kuai and published by . This book was released on 2012 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: While sediment transport in steady uniform flows has been studied extensively, significant amount of sediment movement occurs in unsteady flows. A nonhomogeneous discrete-time Markov chain model is proposed in this study to quantify the bedload discharges under unsteady flow conditions. The proposed two-state Markovian bedload model can be further extended to a three-state sediment transport model by adding a suspended load layer as the third state. As opposed to the homogenous two-state Markovian bedload models in literature, the proposed nonhomogeneous Markov chain model ensures the transition probabilities are really time dependent as they are function of local flow conditions. Furthermore, a full model of both the bedload and the suspended load that does not require an equilibrium sediment transport assumption can be achieved by adding a third layer (the suspended load layer) to the existing two-state model. The proposed stochastic sediment transport model can be used to calculate sediment discharges for an arbitrary size fraction of nonuniform sediment. Sediment transport processes vary at a variety of time scales - from seconds, hours, days to months and years. Recognizing the importance of different varying time scales in the fluvial processes of sediment transport, the Hilbert-Huang Transform method (HHT) is introduced to the field of sediment transport for the time scale analysis. The HHT uses the Empirical Mode Decomposition (EMD) method to decompose a time series into a collection of the Intrinsic Mode Functions (IMFs), and uses the Hilbert Spectral Analysis (HSA) to obtain instantaneous frequency data. The EMD extracts the variability of data with different time scales, and improves the analysis of data series. The HSA can display the succession of time varying time scales,which cannot be captured by the often-used Fast Fourier Transform (FFT) method. This study is one of the earlier attempts to introduce the state-of-the-art data analysis technique for the multiple time sales analysis of sediment transport processes. Three practical applications of the HHT method for data analysis of both suspended sediment and bedload transport time series are presented.
Author : Shiyan Zhang
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (78 download)
Download or read book Numerical Study of Sediment Transport Under Unsteady Flow written by Shiyan Zhang and published by . This book was released on 2011 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical model for simulating sediment transport in unsteady flow is incomplete in several aspects: first of all, the numerical schemes have been proved suitable for the simulation of flow over rigid bed needs to be reevaluated for unsteady flow over mobile bed; secondly, existing non-equilibrium sediment transport models are empirically developed and therefore lack of consistency regarding the evaluation of the non-equilibrium parameters; thirdly, the sediment transport in various applications have unique features which needs to be considered in the models. Sediment transport in unsteady flows was studied using analytical and numerical methods. A one dimensional (1D) finite volume method (FVM) model was developed. Five popular numerical schemes were implemented into the model and their performances were evaluated under highly unsteady flow condition. A novel physically-based non-equilibrium sediment transport model was established to describe the non-equilibrium sediment transport process. Infiltration effects on flow and sediment transport was included to make the model applicable to simulate irrigation induced soil erosion in furrows. The Laursen (1958) formula was adopted and modified to calculate the erodibility of fine-grain sized soil, and then verified by laboratory and field datasets. The numerical model was applied to a series of simulations of sediment transport in highly unsteady flow including the dam break erosional flow, flash flood in natural rivers and irrigation flows and proved to be applicable in various applications. The first order schemes were able to produce smooth and reasonably accurate results, and spurious oscillations were observed in the simulated results produced by second order schemes. The proposed non-equilibrium sediment transport model yielded better results than several other models in the literatures. The modified Laursen (1958) formula adopted was applicable in calculating the erodibility of the soil in irrigation. Additionally, it was indicated that the effect of the jet erosion and the structural failure of the discontinuous bed topography cannot be properly accounted for due to the limitation of 1D model. The comparison between the simulated and measured sediment discharge hydrographs indicated a potential process associated to the transport of the fine-grain sized soil in the irrigation furrows.
Author : Faruk Bhuiyan
Publisher : BoD – Books on Demand
ISBN 13 : 9533073748
Total Pages : 274 pages
Book Rating : 4.5/5 (33 download)
Download or read book Sediment Transport written by Faruk Bhuiyan and published by BoD – Books on Demand. This book was released on 2011-10-26 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to put together recent developments on sediment transport and morphological processes. There are twelve chapters in this book contributed by different authors who are currently involved in relevant research. First three chapters provide information on basic and advanced flow mechanisms including turbulence and movement of particles in water. Examples of computational procedures for sediment transport and morphological changes are given in the next five chapters. These include empirical predictions and numerical computations. Chapters nine and ten present some insights on environmental concerns with sediment transport. Last two contributions deal with two large-scale case studies related to changes in the transport and provenance of glacial marine sediments, and processes involving land slides.
Author : Qiang Li
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (181 download)
Download or read book Numerical Simulation of Non-equilibrium Graded Sediment Transport written by Qiang Li and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Paul Guyer
Publisher : Independently Published
ISBN 13 : 9781717711908
Total Pages : 34 pages
Book Rating : 4.7/5 (119 download)
Download or read book An Introduction to Nonequilibrium Transport of Soil Sediment written by J. Paul Guyer and published by Independently Published. This book was released on 2018-07-09 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil and geotechnical engineers interested in nonequilibrium transport of soil sediment at rivers and other waterways. Here is what is discussed:1. INTRODUCTION2. SPECIFIC GAGE PLOTS3. EQUILIBRIUM VERSUS NONEQUILIBRIUM CONDITIONS4. MASS BALANCE MODELS5. NUMERICALLY MODELING THE NONEQUILIBRIUM CONDITION6. EQUATIONS OF FLOW AND CONTINUITY7. ASSUMPTIONS8. THE BOUNDARY VALUE PROBLEM9. GENERAL DATA REQUIREMENTS10. GEOMETRIC DATA11. BED-MATERIAL DATA12. HYDROLOGIC DATA13. SEDIMENT INFLOW DATA14. TEMPORAL VARIATIONS15. DATA AND PROFILE ACCURACY16. MODEL PERFORMANCE17. MODEL ADJUSTMENT18. MODEL CIRCUMSTANTIATION PROCESS19. PROCESSES TO OBSERVE20. CORRECTING POOR MODEL PERFORMANCE21. DEVELOPMENT OF BASE TEST AND ANALYSIS OF ALTERNATIVES.
Author : Cigb Icold
Publisher : CRC Press
ISBN 13 : 1000383512
Total Pages : 334 pages
Book Rating : 4.0/5 (3 download)
Download or read book Mathematical Modelling of Sediment Transport and Deposition in Reservoirs - Guidelines and Case Studies / Modélisation Mathématique du Transport et des Dépôts de Sédiments dans les Réservoirs - Lignes Directrices et Études de Cas written by Cigb Icold and published by CRC Press. This book was released on 2021-06-27 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: As reservoir sedimentation has proven to be a serious problem in South Africa, research in this field has been ongoing for more than 70 years. This publication emanates from extensive research which has been undertaken over the past 30 years with the support of the South African Department of Water and Sanitation as well as the South African Water Research Commission. A great deal of information has fortunately also been obtained from China. Given the universal nature of hydraulic formulae it is not surprising, yet gratifying, that Chinese and South African data generally conform to the same mathematical relationships. This indicates that these relationships should be applicable in other countries as well. Much of the information contained here has been condensed from a more comprehensive publication. This ICOLD Bulletin follows on Bulletin 115 “Dealing with reservoir sedimentation”, which gave guidelines for management of reservoirs to limit sedimentation. The guidelines on mathematical modelling of sediment transport dynamics in reservoirs in this document can be used during the planning and design of new dams, as well as for the management of existing dams. Comme la sédimentation dans les réservoirs s'est avérée être un problème sérieux en Afrique du Sud, la recherche dans ce domaine est en cours depuis plus de 70 ans. Cette publication émane de la recherche étendue qui a été menée au cours des 30 dernières années avec l'appui du ministère sud-africain de l’eau et de l’assainissement, ainsi que de la commission sud-africaine de recherche sur l'eau. Un grand nombre d'informations ont également été obtenues de la part de la Chine. Étant donné le caractère universel de formules hydrauliques, il n'est pas surprenant, mais très gratifiant, que les données chinoises et sud-africaines se conforment généralement aux mêmes relations mathématiques. Ceci indique que ces relations devraient être applicables dans d'autres pays également. Une grande partie de l'information contenue ici a été condensée à partir d'une publication plus complète. Ce bulletin CIGB fait suite au bulletin 115 "Traité sur la sédimentation dans les réservoirs", qui a donné des directives pour la gestion des réservoirs en vue de limiter la sédimentation. Les directives sur la modélisation mathématique de la dynamique de transport des sédiments dans les réservoirs de ce présent document peuvent être utilisées lors de la planification et la conception de nouveaux barrages et pour la gestion des barrages existants.
Author : J. Paul Guyer, P.E., R.A.
Publisher : Guyer Partners
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4./5 ( download)
Download or read book An Introduction to Nonequilibrium Transport of Soil Sediment written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2018-07-09 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil and geotechnical engineers interested in nonequilibrium transport of soil sediment at rivers and other waterways. Here is what is discussed: 1. INTRODUCTION 2. SPECIFIC GAGE PLOTS 3. EQUILIBRIUM VERSUS NONEQUILIBRIUM CONDITIONS 4. MASS BALANCE MODELS 5. NUMERICALLY MODELING THE NONEQUILIBRIUM CONDITION 6. EQUATIONS OF FLOW AND CONTINUITY 7. ASSUMPTIONS 8. THE BOUNDARY VALUE PROBLEM 9. GENERAL DATA REQUIREMENTS 10. GEOMETRIC DATA 11. BED-MATERIAL DATA 12. HYDROLOGIC DATA 13. SEDIMENT INFLOW DATA 14. TEMPORAL VARIATIONS 15. DATA AND PROFILE ACCURACY 16. MODEL PERFORMANCE 17. MODEL ADJUSTMENT 18. MODEL CIRCUMSTANTIATION PROCESS 19. PROCESSES TO OBSERVE 20. CORRECTING POOR MODEL PERFORMANCE 21. DEVELOPMENT OF BASE TEST AND ANALYSIS OF ALTERNATIVES.
Author : Sarfraz Munir
Publisher : CRC Press
ISBN 13 : 0415669472
Total Pages : 287 pages
Book Rating : 4.4/5 (156 download)
Download or read book Role of Sediment Transport in Operation and Maintenance of Supply and Demand Based Irrigation Canals: Application to Machai Maira Branch Canals written by Sarfraz Munir and published by CRC Press. This book was released on 2011-01-27 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work describes the role of sediment transport in the operation and maintenance of demand-based downstream controlled irrigation canals. Sediment deposition in these irrigation canals severely affects the operation of the automatic flow control system. The book also discusses sediment transport modelling in irrigation canals. A simplified 1-D mathematical model SETRIC (SEdiment TRansport in Irrigation Canals) has been improved with the inclusion of downstream control component for the downstream controlled irrigation canals. Based on field measurements and sediment transport modelling, a number of approaches have been proposed for sediment management in such irrigation canals by improvement in their design and operation. This book will be of interest to Irrigation Engineers and Managers, Hydraulic Engineers, Water Resources Engineers and Managers, Civil Engineers, and Agricultural Engineers.
Author : Tetsuya Sumi
Publisher : Springer Nature
ISBN 13 : 9811629048
Total Pages : 559 pages
Book Rating : 4.8/5 (116 download)
Download or read book Wadi Flash Floods written by Tetsuya Sumi and published by Springer Nature. This book was released on 2021-10-11 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book brings together research studies, developments, and application-related flash flood topics on wadi systems in arid regions. The major merit of this comprehensive book is its focus on research and technical papers as well as case study applications in different regions worldwide that cover many topics and answer several scientific questions. The book chapters comprehensively and significantly highlight different scientific research disciplines related to wadi flash floods, including climatology, hydrological models, new monitoring techniques, remote sensing techniques, field investigations, international collaboration projects, risk assessment and mitigation, sedimentation and sediment transport, and groundwater quality and quantity assessment and management. In this book, the contributing authors (engineers, researchers, and professionals) introduce their recent scientific findings to develop suitable, applicable, and innovative tools for forecasting, mitigation, and water management as well as society development under seven main research themes as follows: Part 1. Wadi Flash Flood Challenges and Strategies Part 2. Hydrometeorology and Climate Changes Part 3. Rainfall–Runoff Modeling and Approaches Part 4. Disaster Risk Reduction and Mitigation Part 5. Reservoir Sedimentation and Sediment Yield Part 6. Groundwater Management Part 7. Application and Case Studies The book includes selected high-quality papers from five series of the International Symposium on Flash Floods in Wadi Systems (ISFF) that were held in 2015, 2016, 2017, 2018, and 2020 in Japan, Egypt, Oman, Morocco, and Japan, respectively. These collections of chapters could provide valuable guidance and scientific content not only for academics, researchers, and students but also for decision-makers in the MENA region and worldwide.
