An experimental study of the interaction of two successive solitary waves in the swash: A strongly interacting case and a weakly interacting case

Pujara, Nimish; Liu, Philip L.‐F.; Yeh, Harry

doi:10.1016/j.coastaleng.2015.07.011

Cited by 26 publications

(19 citation statements)

References 47 publications

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“…Waveswash interactions (Caceres and Alsina, 2012;Hughes and Moseley, 2007) (sometimes termed swash-swash interactions) occur when waves arrive at the shoreline during a preceding uprush, hence adding momentum ("wavecapture") or during the preceding backwash, inducing opposing momentum (termed "wave-backwash interaction"). The type and degree of wave-swash interaction is highly important for swash zone hydrodynamics, as the momentum of the incident wave affects the shoreline motion (Erikson et al, 2005) and swash velocities (Chen et al, 2016;Pujara et al, 2015), but also for swash zone sediment transport where certain wave-swash interactions events have been shown to promote large sediment re-suspension events and offshore sediment transport (Alsina et al, 2012;Blenkinsopp et al, 2011;Caceres and Alsina, 2012).…”

Section: Introductionmentioning

confidence: 99%

The influence of wave groups and wave-swash interactions on sediment transport and bed evolution in the swash zone

Alsina

Zanden

Caceres

et al. 2018

Coastal Engineering

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Large scale laboratory measurements of sediment dynamics in the swash zone are presented. Two bichromatic wave group conditions were generated, having the same energy content but different wave group period (T g = 15.0 s and 27.7 s). For the shortest wave group, due to bore focussing, the shoreline fluctuates predominantly at the T g time scale, showing a large runup and the presence of wave-swash interactions with strong momentum exchange. In contrast, for the longer wave groups, the swash excursion is dominated by the individual waves. The uprush generally promotes onshore sediment advection with consequent erosion at the rundown location but accretion close to the runup. On the contrary, the backwash promotes seaward sediment advection and accretion at the rundown location. The presence of repeated wave-swash interactions modifies these patterns slightly. A wave overrunning a previous uprush promotes a reduction in onshore sediment advection while weak wave-backwash interactions reduce seaward advection. Consequently, the measured sediment dynamics shows stronger intra-swash cross-shore sediment advection for the swash events produced by the short wave groups. Measurements of the sheet flow layer near the shoreline show that for the shortest wave groups the vertical structure of the concentration

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Section: Introductionmentioning

confidence: 99%

The influence of wave groups and wave-swash interactions on sediment transport and bed evolution in the swash zone

Alsina

Zanden

Caceres

et al. 2018

Coastal Engineering

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“…Cowen et al, 2003, Barnes et al, 2009, Pujara and Liu, 2014, Jiang and Baldock, 2015, Ruju et al, 2016 and swash-swash interactions (e.g. Lo et al, 2013, Pujara et al, 2015, Chen et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Entrained air in bore-driven swash on an impermeable rough slope

Dai

Kikkert

Chen

et al. 2017

Coastal Engineering

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The aim of the present investigation is to clarify the role and evaluate the importance of air entrainment in the swash zone by carrying out a set of detailed laboratory experiments. Experiments involved generating a single, highly repeatable, large-scale, bore-driven swash event on a sand-rough impermeable beach with slope 1:10. Measurements that yield the characteristics of the entrained air, including the void fractions, bubble size and bed-parallel bubble velocity, and the hydrodynamics are obtained at five crossshore locations in the swash zone using an optical probe and a combined PIV/LIF system. The results show that two distinct bubble clouds enter the swash zone, the first is the result of local entrainment at the wave tip and the second are the remaining bubbles of the air that is entrained at the second plunge point of wave breaking before the wave starts climbing the beach. The void fractions are up to 0.20 and bubble size up to 20mm which are similar to air entrainment after wave breaking in the surf zone and deep water. Local entrainment of air continues in the swash zone, but void fractions decrease rapidly with distance up the slope and no air is present after flow reversal. Energy dissipation in the swash zone attributable to entrained air is at least of order 1% of the total energy dissipation. This is smaller than in the surf zone or deep water because of the smaller volume of entrained air and the greater total energy dissipation in the swash zone.

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“…Subsequently, by using large-scale laboratory experiments, Pujara et al (2015) studied the interaction of double solitary waves with equal wave heights in the swash zone on a plane beach.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on transient harbor oscillations induced by successive solitary waves

Gao

Liu

et al. 2017

Ocean Dynamics

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Tsunamis are traveling waves which are characterized by long wavelengths and large amplitudes close to the shore. Due to the transformation of tsunamis, undular bores have been frequently observed in the coastal zone and can be viewed as a sequence of solitary waves with different wave heights and different separation distances among them. In this article, transient harbor oscillations induced by incident successive solitary waves are first investigated. The transient oscillations are simulated by a fully nonlinear Boussinesq model, FUNWAVE-TVD. The incident successive solitary waves include double solitary waves and triple solitary waves. This paper mainly focuses on the effects of different waveform parameters of the incident successive solitary waves on the relative wave energy distribution inside the harbor. These wave parameters include the incident wave height, the relative separation distance between adjacent crests and the number of elementary solitary waves in the incident wave train. The relative separation distance between adjacent crests is defined as the ratio of the distance between adjacent crests in the incident wave train to the effective wavelength of the single solitary wave. Maximum oscillations inside the harbor excited by various incident waves are also discussed. For comparison, the transient oscillation excited by the single solitary wave is also considered. The

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An experimental study of the interaction of two successive solitary waves in the swash: A strongly interacting case and a weakly interacting case

Cited by 26 publications

References 47 publications

The influence of wave groups and wave-swash interactions on sediment transport and bed evolution in the swash zone

The influence of wave groups and wave-swash interactions on sediment transport and bed evolution in the swash zone

Entrained air in bore-driven swash on an impermeable rough slope

Numerical study on transient harbor oscillations induced by successive solitary waves

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