River scale model of a training dam using lightweight granulates

Vermeulen, B.; Boersema, M.P.; Hoitink, A.J.F.; Sieben, J. W.; Sloff, C.J.; Wal, Marcel F. van der

doi:10.1016/j.jher.2013.05.004

Cited by 12 publications

(9 citation statements)

References 13 publications

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“…As a check of the results obtained in section 3.1, i.e.,

| \bar{ϵ} | \propto u

and percentage of missing values

\propto D

, a sand bed experiment is compared to a polystyrene measurement of the bed profile. Using polystyrene, small flow velocities and water depths suffice to create dunes that are dynamically similar to those in prototype rivers (Vermeulen et al, ). As shown in Figure , the sand case (top) shows much more scatter and more missing data compared to the polystyrene case (bottom).…”

Section: Resultsmentioning

confidence: 99%

“…Because of the irregularly spaced nature of the retrieved data, an algorithm that does not need interpolation to a regular grid beforehand is prefered. A LOcally weighted regrESSion algorithm (LOESS) (Cleveland, ; Cleveland & Devlin, ) is an appropriate choice (e.g., Plant et al, ; Vermeulen et al, ). This interpolation and smoothing method is based on a polynomial fit to the data using weighted least squares.…”

Section: Measurement Principlesmentioning

confidence: 99%

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Application of a Line Laser Scanner for Bed Form Tracking in a Laboratory Flume

Ruijsscher

Hoitink

Dinnissen

et al. 2018

Water Resources Research

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A new measurement method for continuous detection of bed forms in movable bed laboratory experiments is presented and tested. The device consists of a line laser coupled to a 3‐D camera, which makes use of triangulation. This allows to measure bed forms during morphodynamic experiments, without removing the water from the flume. A correction is applied for the effect of laser refraction at the air‐water interface. We conclude that the absolute measurement error increases with increasing flow velocity, its standard deviation increases with water depth and flow velocity, and the percentage of missing values increases with water depth. Although 71% of the data is lost in a pilot moving bed experiment with sand, still high agreement between flowing water and dry bed measurements is found when a robust LOcally weighted regrESSion (LOESS) procedure is applied. This is promising for bed form tracking applications in laboratory experiments, especially when lightweight sediments like polystyrene are used, which require smaller flow velocities to achieve dynamic similarity to the prototype. This is confirmed in a moving bed experiment with polystyrene.

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“…As a check of the results obtained in section 3.1, i.e.,

| \bar{ϵ} | \propto u

and percentage of missing values

\propto D

Section: Resultsmentioning

confidence: 99%

Section: Measurement Principlesmentioning

confidence: 99%

Application of a Line Laser Scanner for Bed Form Tracking in a Laboratory Flume

Ruijsscher

Hoitink

Dinnissen

et al. 2018

Water Resources Research

Self Cite

View full text Add to dashboard Cite

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“…But for understanding landscape development, there is a need to recognize and quantify basic principles in geomorphology. To represent this level of abstraction, scaled experiments have been developed, mainly in fluvial morphology Postma et al, 2008;Vermeulen et al, 2014;Wallerstein et al, 2001) or mass wasting (Major, 1997;Okuda, 1991). Their benefit for understanding geomorphological systems is widely recognised Paola et al, 2009) and has even led to experiments to explain extra-terrestrial geomorphic features (Shinbrot et al, 2004;Védie et al, 2008).…”

Section: Experiments In Geomorphologymentioning

confidence: 99%

Experiments as tools in geomorphology

Seeger

2017

CIG

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“…Schematic of a longitudinal training dam placed closer to the fairway than the present-day groynes stretch from the banks. Adapted from Vermeulen et al [1]. environmental conditions, due to high disturbance by impacts from navigation, which causes shipping waves, water displacement and bank erosion.…”

Section: Introductionmentioning

confidence: 99%

“…It is therefore important to achieve a thorough understanding of the transport processes associated with an LTD, and using this knowledge, to optimize the design regarding the hydro-physical and ecological consequences. Here, we report on a completed study in a laboarotory setting [1], focussing on flow and morphodynamics in the transition from a series of groynes to an LTD. In a companion paper [3], ongoing experiments are being presented for an LTD constructed at a local widening of a river.…”

Section: Introductionmentioning

confidence: 99%

Scale model of a training dam using lightweight granulates

et al. 2018

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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.

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River scale model of a training dam using lightweight granulates

Cited by 12 publications

References 13 publications

Application of a Line Laser Scanner for Bed Form Tracking in a Laboratory Flume

Application of a Line Laser Scanner for Bed Form Tracking in a Laboratory Flume

Experiments as tools in geomorphology

Scale model of a training dam using lightweight granulates

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