Scale model of a training dam using lightweight granulates

Bart Vermeulen, Matthijs Boersema, Ton Hoitink, Arjan Sieben, Kees Sloff, Maarten Van Der Wal

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Abstract

Longitudinal training dams (LTDs) are a promising alternative for river groynes. Here we summarize findings of a recent study focused on the along river transition from a series of river groynes to an LTD, where the flow divides between the fairway and the side channel between the LTD and the river bank. 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. The key advantage of using lightweight granulates is that both the Shields number and the Froude number are similar in the model and the prototype. A high flow and a low flow experiment were carried out. The bedforms in the physical model have dimensions that correspond to theoretical dune height predictions, and also the channel incision due to width reduction is in accordance with expectations. The scour holes that develop near the tip of the groynes, however, are too deep, which may relate to improper scaling of the local turbulent vortices, initiated at the groynes. The morphodynamic developments in the flow divergence zone are subtle, and are overwhelmed by the mobile bed response to the presence of groynes. Considering that the physical model over-predicts the erosion caused by groynes, this suggests that the LTD configuration subject to study results in a comparatively stable bed morphology.

Original languageEnglish
Article number05074
JournalE3S Web of Conferences
Volume40
DOIs
Publication statusPublished - 5 Sep 2018
EventRiver Flow 2018: 9th International Conference on Fluvial Hydraulics 2018 - Espace Tête d’Or, Lyon, France
Duration: 5 Sep 20188 Sep 2018
Conference number: 9
https://riverflow2018.irstea.fr/

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