Inundation, runup and flow velocity of wavemaker generated bores on a planar beach

Barranco, Ignacio; Liu, Philip L.‐F.

doi:10.1017/jfm.2023.116

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Following Barranco & Liu (2022), the instantaneous free surface is identified directly from the raw images. As shown in figures 3 to 4, the free surface profiles can be identified relatively easily during the later phase of the uprush flows and the beginning phase of the downwash flows as the free surface is relatively smooth (free of breaking and bubbles) and can be clearly identified in the raw images (panels a – f of the figures).…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…The free surface profiles were identified by manually locating the and locations in pixels from the raw PIV images at least every 200 image frames and as many as every 5 frames when the free surface profile changed rapidly during wave breaking. Following Barranco & Liu (2022), the full set of a single realisation of the free surface profile were interpolated in space and time with the selected points. As shown in figure 18, the green line is the estimated free surface profile and the red line is the beach bed.…”

Section: Figure 18mentioning

confidence: 99%

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Swash flows generated by a train of solitary waves on a planar slope

Sou¹,

Wu²,

Liu³

2023

J. Fluid Mech.

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Six consecutive solitary waves with identical wave height and separation time are generated to study the flow structures during the uprush–downwash interactions in the swash zone. Using particle image velocimetry, the cross-shore velocity fields are captured. Two different wave conditions are examined with different wave-height-to-water-depth ratios, i.e. $H_o/h=0.11$ and 0.22. The uprush–downwash interaction reaches quasi-steady state from the third solitary wave for both cases. For the former case, a weak non-stationary hydraulic jump appears during the downwash flow for all the six consecutive waves. The weak hydraulic jump evolves into a momentarily ‘stationary’ broken bore when the next wave arrives. For the latter case, the larger wave height generates stronger wave breaking. No non-stationary hydraulic jump is observed as the duration of downwash flow is relatively short. The flow reverses to the onshore direction before the downwash Froude number reaches the hydraulic jump condition. The temporal and spatial evolution of turbulence structure at the quasi-steady state is quantified using the spatial spectral analysis, the integral length scale and turbulence eddy viscosity. The results suggest that the large-scale energy generated during the uprush–downwash interaction modified the slope of the turbulence energy spatial spectrum in the inertial subrange from $-$ 5/3 to $-$ 1 in the larger length scale region, indicating the energy cascade depends not only on the dissipation rate, but also on the turbulent kinetic energy from the large-scale turbulence structure because of the large-scale energy injection in the inertial subrange.

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Section: Laboratory Experimentsmentioning

confidence: 99%

Section: Figure 18mentioning

confidence: 99%

Swash flows generated by a train of solitary waves on a planar slope

Sou¹,

Wu²,

Liu³

2023

J. Fluid Mech.

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“…Bores have also been generated in laboratory by using a piston-type wavemaker (e.g., Miller 1968). Using a long stroke wavemaker, Barranco and Liu (2022) studied the surf and swash flows produced by bores of different strength and length. They also produced and analyzed decaying bores, which are short bores with decaying strength.…”

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confidence: 99%

Characteristics of Bores Generated by Different Mechanisims in the Laboratory

Barranco,

Liu,

Chandler

2023

Int. Conf. Coastal. Eng.

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The present work focuses on investigating characteristics of tsunami-like bores generated by different generation systems in the laboratory. These characteristics include the bore strength, bore height and bore length. In this presentation we shall compare the bores generated employing the different generation mechanisms and provide analytical relations to aid in laboratory experimental design aiming to generate bores or inundations of specific characteristics. We shall also present an extended dataset of non-uniform bores generated employing the combination of dam-break, wavemaker and PLWG systems, including inundation and run-up measurements. In addition, the generation of N-bores is explored.

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