Side channel dynamics

    Research output: ThesisPhD Thesis - Research UT, graduation UT

    111 Downloads (Pure)

    Abstract

    Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the mechanisms that drive the morphodynamic development of side channels and thereby, improve the design of side channels and reduce their maintenance needs. We studied the development of side channel in various ways and found that mechanisms such as a length difference between the downstream channels, sediment sorting at the bifurcation and varying hydrodynamic conditions have a large effect on the morphodynamic development of a side channel system. The mechanisms that are important are not the same for each side channel and can vary in time. Therefore, we propose three categories of side channel based on how the sediment that is deposited in the side channel is transported in the main channel: (1) bed load supplied, (2) suspended bed-material load supplied and (3) wash load supplied side channels. These categories can help in determining the main mechanisms that affect the development of a side channel system. In addition, we propose a method based on the categorization that can aid the design, operation and maintenance of side channels.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • University of Twente
    Supervisors/Advisors
    • Hulscher, Suzanne J.M.H., Supervisor
    • Schielen, Ralph Mathias Johannes, Co-Supervisor
    Thesis sponsors
    Award date11 Apr 2019
    Place of PublicationEnschede
    Publisher
    Print ISBNs978-90-365-4743-7
    DOIs
    Publication statusPublished - 11 Apr 2019

    Fingerprint

    Sediments
    Rivers
    Sorting
    Discharge (fluid mechanics)
    Hydrodynamics

    Keywords

    • Side channel
    • Bifurcation
    • Morphodynamic modelling
    • River morphodynamics
    • Bifurcation sediment sorting
    • Floodplain sedimentation

    Cite this

    van Denderen, Robert Pepijn. / Side channel dynamics. Enschede : University of Twente, 2019. 186 p.
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    title = "Side channel dynamics",
    abstract = "Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the mechanisms that drive the morphodynamic development of side channels and thereby, improve the design of side channels and reduce their maintenance needs. We studied the development of side channel in various ways and found that mechanisms such as a length difference between the downstream channels, sediment sorting at the bifurcation and varying hydrodynamic conditions have a large effect on the morphodynamic development of a side channel system. The mechanisms that are important are not the same for each side channel and can vary in time. Therefore, we propose three categories of side channel based on how the sediment that is deposited in the side channel is transported in the main channel: (1) bed load supplied, (2) suspended bed-material load supplied and (3) wash load supplied side channels. These categories can help in determining the main mechanisms that affect the development of a side channel system. In addition, we propose a method based on the categorization that can aid the design, operation and maintenance of side channels.",
    keywords = "Side channel, Bifurcation, Morphodynamic modelling, River morphodynamics, Bifurcation sediment sorting, Floodplain sedimentation",
    author = "{van Denderen}, {Robert Pepijn}",
    year = "2019",
    month = "4",
    day = "11",
    doi = "10.3990/1.9789036547437",
    language = "English",
    isbn = "978-90-365-4743-7",
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    address = "Netherlands",
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    van Denderen, RP 2019, 'Side channel dynamics', Doctor of Philosophy, University of Twente, Enschede. https://doi.org/10.3990/1.9789036547437

    Side channel dynamics. / van Denderen, Robert Pepijn.

    Enschede : University of Twente, 2019. 186 p.

    Research output: ThesisPhD Thesis - Research UT, graduation UT

    TY - THES

    T1 - Side channel dynamics

    AU - van Denderen, Robert Pepijn

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    N2 - Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the mechanisms that drive the morphodynamic development of side channels and thereby, improve the design of side channels and reduce their maintenance needs. We studied the development of side channel in various ways and found that mechanisms such as a length difference between the downstream channels, sediment sorting at the bifurcation and varying hydrodynamic conditions have a large effect on the morphodynamic development of a side channel system. The mechanisms that are important are not the same for each side channel and can vary in time. Therefore, we propose three categories of side channel based on how the sediment that is deposited in the side channel is transported in the main channel: (1) bed load supplied, (2) suspended bed-material load supplied and (3) wash load supplied side channels. These categories can help in determining the main mechanisms that affect the development of a side channel system. In addition, we propose a method based on the categorization that can aid the design, operation and maintenance of side channels.

    AB - Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the mechanisms that drive the morphodynamic development of side channels and thereby, improve the design of side channels and reduce their maintenance needs. We studied the development of side channel in various ways and found that mechanisms such as a length difference between the downstream channels, sediment sorting at the bifurcation and varying hydrodynamic conditions have a large effect on the morphodynamic development of a side channel system. The mechanisms that are important are not the same for each side channel and can vary in time. Therefore, we propose three categories of side channel based on how the sediment that is deposited in the side channel is transported in the main channel: (1) bed load supplied, (2) suspended bed-material load supplied and (3) wash load supplied side channels. These categories can help in determining the main mechanisms that affect the development of a side channel system. In addition, we propose a method based on the categorization that can aid the design, operation and maintenance of side channels.

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    KW - Bifurcation

    KW - Morphodynamic modelling

    KW - River morphodynamics

    KW - Bifurcation sediment sorting

    KW - Floodplain sedimentation

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    M3 - PhD Thesis - Research UT, graduation UT

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