Sediment Transport in Unsteady Flows
Author: Peter Goodwin
Publisher:
Published: 1989
Total Pages: 227
ISBN-13:
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Author: Peter Goodwin
Publisher:
Published: 1989
Total Pages: 227
ISBN-13:
DOWNLOAD EBOOKAuthor: Maryam Alihosseini
Publisher:
Published: 2019
Total Pages:
ISBN-13: 9783967290189
DOWNLOAD EBOOKAuthor: Shu-Qing Yang
Publisher:
Published: 2022
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKSediment transport (ST) in unsteady flows is a complex phenomenon that the existing formulae are often invalid to predict. Almost all existing ST formulae assume that sediment transport can be fully determined by parameters in streamwise direction without parameters in vertical direction. Different from this assumption, this paper highlights the importance of vertical motion and the vertical velocity is suggested to represent the vertical motion. A connection between unsteadiness and vertical velocity is established. New formulae in unsteady flows have been developed from inception of sediment motion, sediment discharge to suspension,Äôs Rouse number. It is found that upward vertical velocity plays an important role for sediment transport, its temporal and spatial alternations are responsible for the phase lag phenomenon and bedform formation. Reasonable agreement between the measured and the proposed conceptual model was achieved.
Author: Shiyan Zhang
Publisher:
Published: 2011
Total Pages: 380
ISBN-13:
DOWNLOAD EBOOKNumerical 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: Herman Depeweg
Publisher: CRC Press
Published: 2014-10-01
Total Pages: 314
ISBN-13: 1138026956
DOWNLOAD EBOOKSediment 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.
Author: Geological Survey (U.S.)
Publisher:
Published: 1976
Total Pages: 308
ISBN-13:
DOWNLOAD EBOOKAuthor: Lechoslaw Suszka
Publisher:
Published: 1988
Total Pages: 266
ISBN-13:
DOWNLOAD EBOOKAuthor: A. Mueller
Publisher: CRC Press
Published: 2020-08-26
Total Pages: 550
ISBN-13: 1000151417
DOWNLOAD EBOOKThis book presents the studies on sediment transport in suspension and sediment transport in steep channels. It discusses the degradation and particle sorting processes.
Author: Herman Depeweg
Publisher: CRC Press
Published: 2007-04-05
Total Pages: 236
ISBN-13: 0203945816
DOWNLOAD EBOOKThe transport of sediment greatly influences the sustainability of an irrigation system. Erosion and deposition not only increase maintenance costs, but may result in an inequitable and inadequate distribution of irrigation water. Understanding the behaviour and transport of sediment allows efficient planning and reliable water delivery schedules,
Author: Pierre Y. Julien
Publisher: Cambridge University Press
Published: 2018-04-12
Total Pages: 527
ISBN-13: 1107462770
DOWNLOAD EBOOKCompletely updated and with three new chapters, this analysis of river dynamics is invaluable for advanced students, researchers and practitioners.