A Laboratory Study on the Geometric Effects of Piano Key Weirs on Scour for Non-Cohesive Substrates and Simple Mitigation Techniques

Lantz, Wyatt

doi:10.26076/b3d7-379d

Cited by 2 publications

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“…The RGB camera properties included a rolling shutter, a max resolution of 1920 × 1080 pixels, an FOV of 64° × 41° × 77° (±3°). Additional camera details are provided in Lantz (2021). A MATLAB script was developed for post processing to gather various scour dimensions and prepare various plots of two-dimensional and three-dimensional scour profiles.…”

Section: Methodsmentioning

confidence: 99%

Evolution of local scour downstream of Type A PK weir in non-cohesive sediments

Lantz

Crookston

Palermo

2022

Journal of Hydrology and Hydromechanics

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A large-scale piano key weir laboratory study was conducted to investigate the evolution of the scour process occurring in the downstream basin for two non-cohesive granular bed materials, including the analysis of scour-hole geometry and patterns at equilibrium. It was observed that hydraulic conditions, particularly tailwater level, significantly affect the scour mechanisms and equilibrium morphology, eventually resulting in scour depths that exceeded the weir height. Unprecedented insights on the scour dynamics are also provided, along with tools to estimate the time evolution and maximum scour depth, its location in the streamwise direction, and the maximum scour length.

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Section: Methodsmentioning

confidence: 99%

Evolution of local scour downstream of Type A PK weir in non-cohesive sediments

Lantz

Crookston

Palermo

2022

Journal of Hydrology and Hydromechanics

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Apron and Cutoff Wall Scour Protection for Piano Key Weirs

Lantz

Crookston

Palermo

2021

Water

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Piano key (PK) weirs are used in a variety of flow control structure applications, including spillway crests and open channel diversion structures. However, to the best of authors’ knowledge, structure-specific design guidance for scour mitigation is still needed. To fill this gap of knowledge, a systematic experimental campaign was conducted by testing different configurations of horizontal aprons with a cutoff wall. Protection structures were located at the toe of the PK weir. Namely, experiments were performed at large-scale to assess the effect of three apron lengths on downstream scour hole geometry under different hydraulic conditions. It was observed that a horizontal apron deflects the plunging jets originating from the PK weir, thus significantly reducing scour. Experimental evidence allowed corroboration that significant scour depth reduction occurs for an apron length 1.5 times the weir height, with longer aprons found to provide marginal benefits. Finally, also provided herein are tools to estimate the main scour characteristics and help practitioners in optimizing apron design.

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A Laboratory Study on the Geometric Effects of Piano Key Weirs on Scour for Non-Cohesive Substrates and Simple Mitigation Techniques

Cited by 2 publications

References 0 publications

Evolution of local scour downstream of Type A PK weir in non-cohesive sediments

Evolution of local scour downstream of Type A PK weir in non-cohesive sediments

Apron and Cutoff Wall Scour Protection for Piano Key Weirs

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