Flow Bifurcation at a Longitudinal Training Dam: Effects on Local Morphology
Timo de Ruijsscher,Suleyman Naqshband,Ton Hoitink +2 more
- Vol. 40, pp 05020
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TLDR
In this article, 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.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.read more
Citations
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Multidecadal Analysis of an Engineered River System Reveals Challenges for Model-Based Design of Human Interventions
TL;DR: In this article, the authors compare a simulated trend in water levels covering a twenty-year period of large-scale human intervention with a thirty-year observational record, and show that the observed water levels display a linearly decreasing trend attributed to channel bed erosion.
Journal ArticleDOI
Scale model of a training dam using lightweight granulates
TL;DR: In this article, a scale model is setup using lightweight granulates made of polystyrene to create conditions that are dynamically similar to a prototype situation in the River Waal, where the flow divides between the fairway and the side channel between the LTD and the river bank.
Journal ArticleDOI
Geomorphological development of aquatic mesohabitats in shore channels along longitudinal training dams
TL;DR: In this article , the authors analyzed data collected using light detection and ranging, multibeam echosounder and aerial photography for the years during and after the construction of the longitudinal training dams (LTDs) in order to determine patterns of erosion and deposition, the retreat rate of steep eroding banks and shoreline length change through time.
Journal ArticleDOI
3D upstream passability of novel river training structures by migratory fish in the river Waal
TL;DR: In this article , the authors assess the passability of the inflows using flow velocity datasets from governmental monitoring campaigns collected with an ADCP during high river discharges (Q = 3489-5066 m3/s at Lobith monitoring station).
References
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Journal ArticleDOI
Longitudinal training dams mitigate effects of shipping on environmental conditions and fish density in the littoral zones of the river Rhine.
Frank Collas,A.D. Buijse,L.P.W.J. van den Heuvel,N. van Kessel,M.M. Schoor,H. Eerden,Rob S. E. W. Leuven +6 more
TL;DR: Results of the field sampling clearly indicate successful ecological rehabilitation of littoral zones that coincides with a facilitation of navigation in the main river channel and increased flood safety.
Journal ArticleDOI
River scale model of a training dam using lightweight granulates
TL;DR: In this paper, the authors investigate the local morphological effects resulting at the intake section of a longitudinal training dam, where the flow is distributed over the main channel and a side channel in between the dam and the river shore.
Journal ArticleDOI
Application of a Line Laser Scanner for Bed Form Tracking in a Laboratory Flume
TL;DR: In this paper, a line laser coupled with a 3D camera is used for continuous detection of bed forms in movable bed laboratory experiments, which makes use of triangulation.