Non Uniform Sediment Transport And Time Scale Analysis In Unsteady And Non Equilibrium Conditions

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Non-uniform Sediment Transport and Time Scale Analysis in Unsteady and Non-equilibrium Conditions

Author : Zheng "Ken." Kuai
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (83 download)

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Book Synopsis Non-uniform Sediment Transport and Time Scale Analysis in Unsteady and Non-equilibrium Conditions by : Zheng "Ken." Kuai

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.

Scaling of One-dimensional Non-equilibrium Sediment Transport While Maintaining Material Properties

Author : Kara Carr
Publisher :
ISBN 13 : 9781303537875
Total Pages : pages
Book Rating : 4.5/5 (378 download)

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Book Synopsis Scaling of One-dimensional Non-equilibrium Sediment Transport While Maintaining Material Properties by : Kara Carr

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.

Non-equilibrium Transport of Non-uniform Suspended Load

Author : Qiwei Han
Publisher : Springer
ISBN 13 : 9789819711222
Total Pages : 0 pages
Book Rating : 4.7/5 (112 download)

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Book Synopsis Non-equilibrium Transport of Non-uniform Suspended Load by : Qiwei Han

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

Sediment Transport in Irrigation Canals

Author : Herman Depeweg
Publisher : CRC Press
ISBN 13 : 1315747502
Total Pages : 309 pages
Book Rating : 4.3/5 (157 download)

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Book Synopsis Sediment Transport in Irrigation Canals by : Herman Depeweg

Download or read book Sediment Transport in Irrigation Canals written by Herman Depeweg and published by CRC Press. This book was released on 2014-10-06 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sediment transport in irrigation canals influences to a great extent the sustainability of an irrigation system. Unwanted erosion or deposition will not only increase maintenance costs, but may also lead to unfair, unreliable and unequitable distribution of irrigation water to the end users. Proper knowledge of the characteristics, including behaviour and transport of sediment will help to design irrigation systems, plan effi cient and reliable water delivery schedules, to have a controlled deposition of sediments, to estimate and arrange maintenance activities, etc. The main aim of these lecture notes is to present a detailed analysis and physical and mathematical descriptions of sediment transport in irrigation canals and to describe the mathematical model SETRIC that predicts the sediment transport, deposition and entrainment rate as function of time and place for various flow conditions and sediment inputs. The model is typically suited for the simulation of sediment transport under the particular conditions of non-wide irrigation canals where the flow and sediment transport are strongly determined by the operation of the flow control structures. The lecture notes will contribute to an improved understanding of the behaviour of sediments in irrigation canals. They will also help to decide on the appropriate design of the system, the water delivery plans, to evaluate design alternatives and to achieve an adequate and reliable water supply to the farmers.

Numerical Study of Sediment Transport Under Unsteady Flow

Author : Shiyan Zhang
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (78 download)

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Book Synopsis Numerical Study of Sediment Transport Under Unsteady Flow by : Shiyan Zhang

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.

Handbook of HydroInformatics

Author : Saeid Eslamian
Publisher : Elsevier
ISBN 13 : 0128219521
Total Pages : 422 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Handbook of HydroInformatics by : Saeid Eslamian

Download or read book Handbook of HydroInformatics written by Saeid Eslamian and published by Elsevier. This book was released on 2022-12-06 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of HydroInformatics Volume III: Water Data Management Best Practices presents the latest and most updated data processing techniques that are fundamental to Water Science and Engineering disciplines. These include a wide range of the new methods that are used in hydro-modeling such as Atmospheric Teleconnection Pattern, CONUS-Scale Hydrologic Modeling, Copula Function, Decision Support System, Downscaling Methods, Dynamic System Modeling, Economic Impacts and Models, Geostatistics and Geospatial Frameworks, Hydrologic Similarity Indices, Hydropower/Renewable Energy Models, Sediment Transport Dynamics Advanced Models, Social Data Mining, and Wavelet Transforms. This volume is an example of true interdisciplinary work. The audience includes postgraduates and above interested in Water Science, Geotechnical Engineering, Soil Science, Civil Engineering, Chemical Engineering, Computer Engineering, Engineering, Applied Science, Earth and Geoscience, Atmospheric Science, Geography, Environment Science, Natural Resources, Mathematical Science, and Social Sciences. It is a fully comprehensive handbook which provides all the information needed related to the best practices for managing water data. Contributions from global experts in the fields of data management research, climate change and resilience, insufficient data problem, etc. Thorough applied examples and case studies in each chapter, providing the reader with real world scenarios for comparison. Includes a wide range of new methods that are used in hydro-modeling, with step-by-step guides on how to use them.

Sediment Transport

Author : Faruk Bhuiyan
Publisher : BoD – Books on Demand
ISBN 13 : 9533073748
Total Pages : 274 pages
Book Rating : 4.5/5 (33 download)

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Book Synopsis Sediment Transport by : Faruk Bhuiyan

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.

Sediment Transport in Aquatic Environments

Author : Andrew Manning
Publisher : BoD – Books on Demand
ISBN 13 : 9533075864
Total Pages : 347 pages
Book Rating : 4.5/5 (33 download)

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Book Synopsis Sediment Transport in Aquatic Environments by : Andrew Manning

Download or read book Sediment Transport in Aquatic Environments written by Andrew Manning and published by BoD – Books on Demand. This book was released on 2011-10-03 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sediment Transport in Aquatic Environments is a book which covers a wide range of topics. The effective management of many aquatic environments, requires a detailed understanding of sediment dynamics. This has both environmental and economic implications, especially where there is any anthropogenic involvement. Numerical models are often the tool used for predicting the transport and fate of sediment movement in these situations, as they can estimate the various spatial and temporal fluxes. However, the physical sedimentary processes can vary quite considerably depending upon whether the local sediments are fully cohesive, non-cohesive, or a mixture of both types. For this reason for more than half a century, scientists, engineers, hydrologists and mathematicians have all been continuing to conduct research into the many aspects which influence sediment transport. These issues range from processes such as erosion and deposition to how sediment process observations can be applied in sediment transport modeling frameworks. This book reports the findings from recent research in applied sediment transport which has been conducted in a wide range of aquatic environments. The research was carried out by researchers who specialize in the transport of sediments and related issues. I highly recommend this textbook to both scientists and engineers who deal with sediment transport issues.

Sediment Transport

Author : Albert Gyr
Publisher : Springer Science & Business Media
ISBN 13 : 140205016X
Total Pages : 290 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Sediment Transport by : Albert Gyr

Download or read book Sediment Transport written by Albert Gyr and published by Springer Science & Business Media. This book was released on 2006-09-21 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook discusses the fundamental principles of sediment transport in the geophysical context of rivers. It is intended as both a course textbook and as a guide for the practical engineer. It begins begin by describing phenomena such as bed load and suspension transport from a classical perspective. Concepts from turbulent flow regime are introduced to address the limitations of the classical approach to various aspects of sediment transport.

Sediment Transport in Unsteady Flows

Author : Peter Goodwin
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Sediment Transport in Unsteady Flows by : Peter Goodwin

Download or read book Sediment Transport in Unsteady Flows written by Peter Goodwin and published by . This book was released on 1986 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

River, Coastal and Estuarine Morphodynamics. RCEM 2009, Two Volume Set

Author : Carlos Vionnet
Publisher : CRC Press
ISBN 13 : 1482266601
Total Pages : 1116 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis River, Coastal and Estuarine Morphodynamics. RCEM 2009, Two Volume Set by : Carlos Vionnet

Download or read book River, Coastal and Estuarine Morphodynamics. RCEM 2009, Two Volume Set written by Carlos Vionnet and published by CRC Press. This book was released on 2018-10-03 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal, estuarine, fluvial and submarine morphodynamics encompass some of the leading processes shaping our planet. They stem mainly, but not only, from the interaction of water in motion and movable sediment boundaries, resulting in morphological changes produced by erosion, transport and deposition of sediments that generate a variety of landsca

Non-equilibrium Sediment Transport

Author : T. Tsujimoto
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Non-equilibrium Sediment Transport by : T. Tsujimoto

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:

Modeling and Simulation

Author :
Publisher :
ISBN 13 :
Total Pages : 508 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Modeling and Simulation by :

Download or read book Modeling and Simulation written by and published by . This book was released on 1989 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

River, Coastal and Estuarine Morphodynamics

Author : G. Seminara
Publisher : Springer Science & Business Media
ISBN 13 : 3662045710
Total Pages : 234 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis River, Coastal and Estuarine Morphodynamics by : G. Seminara

Download or read book River, Coastal and Estuarine Morphodynamics written by G. Seminara and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling and Practice of Erosion and Sediment Transport under Change

Author : Mohamed Meddi
Publisher : MDPI
ISBN 13 : 3039214314
Total Pages : 212 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Modeling and Practice of Erosion and Sediment Transport under Change by : Mohamed Meddi

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.

Advances in Spatio-Temporal Analysis

Author : Xinming Tang
Publisher : CRC Press
ISBN 13 : 0415408156
Total Pages : 2385 pages
Book Rating : 4.4/5 (154 download)

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Book Synopsis Advances in Spatio-Temporal Analysis by : Xinming Tang

Download or read book Advances in Spatio-Temporal Analysis written by Xinming Tang and published by CRC Press. This book was released on 2007-08-23 with total page 2385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in Geographic Information Technology have raised the expectations of users. A static map is no longer enough; there is now demand for a dynamic representation. Time is of great importance when operating on real world geographical phenomena, especially when these are dynamic. Researchers in the field of Temporal Geographical Information Systems (TGIS) have been developing methods of incorporating time into geographical information systems. Spatio-temporal analysis embodies spatial modelling, spatio-temporal modelling and spatial reasoning and data mining. Advances in Spatio-Temporal Analysis contributes to the field of spatio-temporal analysis, presenting innovative ideas and examples that reflect current progress and achievements.

Theoretical Morphodynamics: Straight Channels

Author : Giovanni Seminara
Publisher : Firenze University Press
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.2/5 (215 download)

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Book Synopsis Theoretical Morphodynamics: Straight Channels by : Giovanni Seminara

Download or read book Theoretical Morphodynamics: Straight Channels written by Giovanni Seminara and published by Firenze University Press. This book was released on 2024-03-15 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph presents the mechanistic foundations of the theory of Morhodynamics, a discipline that investigates the shape of the erodible boundary of natural water bodies. We focus on the fluvial Morphodynamics of straight erodible channels, providing the basis for subsequent extensions to meandering rivers (treated in the companion monograph 2 of this series) and braided rivers. We present basic notions on the Mechanics of Turbulent Flows and Sediment Transport in straight open channels with mobile beds. We then investigate their morphodynamic equilibrium and its instability, that leads to the formation of a variety of bedforms observed in natural rivers. In particular, fluvial bars will deserve special attention as the fundamental building block of large scale fluvial patterns.