Flow Bifurcation at a Longitudinal Training Dam

Effects on Local Morphology

Timo De Ruijsscher*, Suleyman Naqshband, Ton Hoitink

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paper

Abstract

Longitudinal training dams (LTDs) have been built over a length of 10 km in the Dutch River Waal as an alternative to groyne fields, splitting the river in a fairway and a bank-connected side channel in the inner bend. Here, we study the physical mechanisms governing the three-dimensional flow and its effect on local morphology at the flow divide using a mobile bed physical model of an LTD, centred around a side channel intake. In line with previous experiments, polystyrene granules are used as a lightweight sediment that allows to achieve dynamic similarity between the model and the prototype. An Acoustic Doppler Velocimetry (ADV) profiler is used to monitor the flow characteristics, whereas a line laser scanner set-up is used to measure the morphological imprint of the flow near the bifurcation point. To study the dependence of the results on the sill height at the side channel intake, different forms and heights of the sill are used. First results show striking similarities with measurements from the field pilot in the Waal River, as well as larger sedimentation in the side channel for a uniform low sill compared to a downstream increasing sill height.

Original languageEnglish
Title of host publicationRiver Flow 2018 - Ninth International Conference on Fluvial Hydraulics
EditorsA. Paquier, N. Rivière
PublisherEDP Sciences
Number of pages8
DOIs
Publication statusPublished - 5 Sep 2018
Event9th International Conference on Fluvial Hydraulics, River Flow 2018 - Lyon-Villeurbanne, France
Duration: 5 Sep 20188 Sep 2018

Publication series

NameE3S Web of Conferences
PublisherEDP Sciences
Volume40
ISSN (Print)2101-6275

Conference

Conference9th International Conference on Fluvial Hydraulics, River Flow 2018
CountryFrance
CityLyon-Villeurbanne
Period5/09/188/09/18

Fingerprint

bifurcation
sill
Dams
dam
Rivers
Jetties
Banks (bodies of water)
river
Sedimentation
groin
Velocity measurement
three-dimensional flow
Polystyrenes
Sediments
profiler
scanner
Acoustics
acoustics
Lasers
laser

Cite this

De Ruijsscher, T., Naqshband, S., & Hoitink, T. (2018). Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology. In A. Paquier, & N. Rivière (Eds.), River Flow 2018 - Ninth International Conference on Fluvial Hydraulics [05020] (E3S Web of Conferences; Vol. 40). EDP Sciences. https://doi.org/10.1051/e3sconf/20184005020
De Ruijsscher, Timo ; Naqshband, Suleyman ; Hoitink, Ton. / Flow Bifurcation at a Longitudinal Training Dam : Effects on Local Morphology. River Flow 2018 - Ninth International Conference on Fluvial Hydraulics. editor / A. Paquier ; N. Rivière. EDP Sciences, 2018. (E3S Web of Conferences).
@inproceedings{87014fe728154eabbe2d8640251a8360,
title = "Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology",
abstract = "Longitudinal training dams (LTDs) have been built over a length of 10 km in the Dutch River Waal as an alternative to groyne fields, splitting the river in a fairway and a bank-connected side channel in the inner bend. Here, we study the physical mechanisms governing the three-dimensional flow and its effect on local morphology at the flow divide using a mobile bed physical model of an LTD, centred around a side channel intake. In line with previous experiments, polystyrene granules are used as a lightweight sediment that allows to achieve dynamic similarity between the model and the prototype. An Acoustic Doppler Velocimetry (ADV) profiler is used to monitor the flow characteristics, whereas a line laser scanner set-up is used to measure the morphological imprint of the flow near the bifurcation point. To study the dependence of the results on the sill height at the side channel intake, different forms and heights of the sill are used. First results show striking similarities with measurements from the field pilot in the Waal River, as well as larger sedimentation in the side channel for a uniform low sill compared to a downstream increasing sill height.",
author = "{De Ruijsscher}, Timo and Suleyman Naqshband and Ton Hoitink",
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language = "English",
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De Ruijsscher, T, Naqshband, S & Hoitink, T 2018, Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology. in A Paquier & N Rivière (eds), River Flow 2018 - Ninth International Conference on Fluvial Hydraulics., 05020, E3S Web of Conferences, vol. 40, EDP Sciences, 9th International Conference on Fluvial Hydraulics, River Flow 2018, Lyon-Villeurbanne, France, 5/09/18. https://doi.org/10.1051/e3sconf/20184005020

Flow Bifurcation at a Longitudinal Training Dam : Effects on Local Morphology. / De Ruijsscher, Timo; Naqshband, Suleyman; Hoitink, Ton.

River Flow 2018 - Ninth International Conference on Fluvial Hydraulics. ed. / A. Paquier; N. Rivière. EDP Sciences, 2018. 05020 (E3S Web of Conferences; Vol. 40).

Research output: Chapter in Book/Report/Conference proceedingConference paper

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T1 - Flow Bifurcation at a Longitudinal Training Dam

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AU - De Ruijsscher, Timo

AU - Naqshband, Suleyman

AU - Hoitink, Ton

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Y1 - 2018/9/5

N2 - Longitudinal training dams (LTDs) have been built over a length of 10 km in the Dutch River Waal as an alternative to groyne fields, splitting the river in a fairway and a bank-connected side channel in the inner bend. Here, we study the physical mechanisms governing the three-dimensional flow and its effect on local morphology at the flow divide using a mobile bed physical model of an LTD, centred around a side channel intake. In line with previous experiments, polystyrene granules are used as a lightweight sediment that allows to achieve dynamic similarity between the model and the prototype. An Acoustic Doppler Velocimetry (ADV) profiler is used to monitor the flow characteristics, whereas a line laser scanner set-up is used to measure the morphological imprint of the flow near the bifurcation point. To study the dependence of the results on the sill height at the side channel intake, different forms and heights of the sill are used. First results show striking similarities with measurements from the field pilot in the Waal River, as well as larger sedimentation in the side channel for a uniform low sill compared to a downstream increasing sill height.

AB - Longitudinal training dams (LTDs) have been built over a length of 10 km in the Dutch River Waal as an alternative to groyne fields, splitting the river in a fairway and a bank-connected side channel in the inner bend. Here, we study the physical mechanisms governing the three-dimensional flow and its effect on local morphology at the flow divide using a mobile bed physical model of an LTD, centred around a side channel intake. In line with previous experiments, polystyrene granules are used as a lightweight sediment that allows to achieve dynamic similarity between the model and the prototype. An Acoustic Doppler Velocimetry (ADV) profiler is used to monitor the flow characteristics, whereas a line laser scanner set-up is used to measure the morphological imprint of the flow near the bifurcation point. To study the dependence of the results on the sill height at the side channel intake, different forms and heights of the sill are used. First results show striking similarities with measurements from the field pilot in the Waal River, as well as larger sedimentation in the side channel for a uniform low sill compared to a downstream increasing sill height.

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A2 - Paquier, A.

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De Ruijsscher T, Naqshband S, Hoitink T. Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology. In Paquier A, Rivière N, editors, River Flow 2018 - Ninth International Conference on Fluvial Hydraulics. EDP Sciences. 2018. 05020. (E3S Web of Conferences). https://doi.org/10.1051/e3sconf/20184005020