Numerical Study of Sediment Transport under Unsteady Flow

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 s...

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Main Author: Zhang, Shiyan
Other Authors: Duan, Jennifer
Language:en
Published: The University of Arizona. 2011
Subjects:
Online Access:http://hdl.handle.net/10150/202536
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spelling ndltd-arizona.edu-oai-arizona.openrepository.com-10150-2025362015-10-23T04:47:23Z Numerical Study of Sediment Transport under Unsteady Flow Zhang, Shiyan Duan, Jennifer Duan, Jennifer Lansey, Kevin Zhang, Lianyang Gupta, Hoshin numerical scheme sediment transport unsteady flow Civil Engineering adaptation length non-equilibrium transport 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. 2011 text Electronic Dissertation http://hdl.handle.net/10150/202536 en Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. The University of Arizona.
collection NDLTD
language en
sources NDLTD
topic numerical scheme
sediment transport
unsteady flow
Civil Engineering
adaptation length
non-equilibrium transport
spellingShingle numerical scheme
sediment transport
unsteady flow
Civil Engineering
adaptation length
non-equilibrium transport
Zhang, Shiyan
Numerical Study of Sediment Transport under Unsteady Flow
description 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.
author2 Duan, Jennifer
author_facet Duan, Jennifer
Zhang, Shiyan
author Zhang, Shiyan
author_sort Zhang, Shiyan
title Numerical Study of Sediment Transport under Unsteady Flow
title_short Numerical Study of Sediment Transport under Unsteady Flow
title_full Numerical Study of Sediment Transport under Unsteady Flow
title_fullStr Numerical Study of Sediment Transport under Unsteady Flow
title_full_unstemmed Numerical Study of Sediment Transport under Unsteady Flow
title_sort numerical study of sediment transport under unsteady flow
publisher The University of Arizona.
publishDate 2011
url http://hdl.handle.net/10150/202536
work_keys_str_mv AT zhangshiyan numericalstudyofsedimenttransportunderunsteadyflow
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