Turbulent free-surface monitoring with an RGB-D sensor: the hydraulic jump case

Bung, Daniel B.; Crookston, Brian M.; Valero, Daniel

doi:10.1080/00221686.2020.1844810

Cited by 18 publications

(9 citation statements)

References 30 publications

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“…According to Bung et al (2021), an Intel® RealSense™ D435 depth camera was used to survey the downstream bed topography at equilibrium (±1.0 mm accuracy operated within 0.6 m and 0.8 m range). This camera includes active stereoscopy via two infrared cameras and an RGB camera.…”

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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“…Hydraulic structure design more often than not involves highly turbulent and aerated flows where seeding particles cannot be implemented and thus requires the development of methods that rely on naturally occurring visual features such as bubbles and droplets. A recent study by Bung et al [ 77 ] employed an RGB-D camera for monitoring and characterizing a highly aerated hydraulic jump using two different methods to calibrate depth estimations (both leading to similar results). The method was able to measure 3D surfaces with high temporal and spatial resolution, although the result evaluation of measurement accuracy was somewhat limited as it was only performed using two-dimensional flow edge position data at channel walls.…”

Section: Methods For Measuring Free Water Surfacementioning

confidence: 99%

A Review on Methods for Measurement of Free Water Surface

Rak

Hočevar

Repinc

et al. 2023

Sensors

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Turbulent free-surface flows are encountered in several engineering applications and are typically characterized by the entrainment of air bubbles due to intense mixing and surface deformation. The resulting complex multiphase structure of the air–water interface presents a challenge in precise and reliable measurements of the free-water-surface topography. Conventional methods by manometers, wave probes, point gauges or electromagnetic/ultrasonic devices are proven and reliable, but also time-consuming, with limited accuracy and are mostly intrusive. Accurate spatial and temporal measurements of complex three-dimensional free-surface flows in natural and man-made hydraulic structures are only viable by high-resolution non-contact methods, namely, LIDAR-based laser scanning, photogrammetric reconstruction from cameras with overlapping field of view, or laser triangulation that combines laser ranging with high-speed imaging data. In the absence of seeding particles and optical calibration targets, sufficient flow aeration is essential for the operation of both laser- and photogrammetry-based methods, with local aeration properties significantly affecting the measurement uncertainty of laser-based methods.

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“…To determine equilibrium morphology, the substrate was scanned with an Intel® Re-alSense TM D435 depth camera (accuracy of ±1 mm) (Intel, Santa Clara, CA, USA) [30,39,40] processed with a Utah State University (USU) custom MATLAB (vR2020) script. The camera data was cross-checked with point measurements taken on a grid layout with a point gage assembly (accuracy of ±1 mm).…”

Section: Methodsmentioning

confidence: 99%

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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Turbulent free-surface monitoring with an RGB-D sensor: the hydraulic jump case

Cited by 18 publications

References 30 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

A Review on Methods for Measurement of Free Water Surface

Apron and Cutoff Wall Scour Protection for Piano Key Weirs

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