Analysis of submerged bar nourishment strategies in a wave-dominated environment using a 2DV process-based model

Spielmann, Karine; Certain, R.; Astruc, Dominique; Barusseau, Jean-Paul

doi:10.1016/j.coastaleng.2011.03.015

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…11d). The transition of onshore migrating nourishment in mild wave conditions to offshore migration in stormy waves is consistent with an earlier study (Spielmann et al, 2011).…”

Section: Effect Of Wave Heightsupporting

confidence: 91%

An idealised study for the evolution of a shoreface nourishment

Chen

Dodd

2019

Continental Shelf Research

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We develop an idealised one dimensional (cross-shore) morphodynamic model that 6 couples wave, tide and sediment dynamics to study the effect and evolution of a 7 shoreface nourishment. Sediment fluxes driven by wave skewness, wave asymmetry 8 (both onshore) and return flow (offshore) are considered. With the aid of new an-9 alytical expressions for the skewness and standard deviation of wave velocity and acceleration, sediment fluxes are calculated. Nourishment is viewed as a perturbation to the system in equilibrium that is subject to the divergence of the perturbed sediment flux and a gravity driven diffusion term. Depending on the location, a nourishment may provide a feeder or lee effect. In moderate and mild wave conditions, the evolution of a nourishment primarily depends on the relative location of nourishment and break point. Placed well offshore of the break point, the nourishment induces an overall positive perturbation in sediment flux, resulting in onshore migration (feeder effect). Located closer to the break point, the nourishment induces an earlier wave breaking, which dissipates part of the wave energy (lee effect), leading to a negative sediment flux perturbation around this break point and a positive sediment flux perturbation around the break point of the un-nourished beach. Depending on the intensity of the earlier breaking, the nourishment either migrates onshore (weak break) or splits into onshore and offshore moving parts (strong break). The relative importance of the diffusion term and the divergence of perturbed sediment flux may lead to a primarily migrating or decaying evolution of nourishment. In storm wave conditions, the nourishment tends to move offshore due to the predominance of return flow driven sediment flux. The sensitivity to wave period and tide are also studied. Model results are consistent with observations, as well as prevailing theory on cross-shore sediment transport.

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“…11d). The transition of onshore migrating nourishment in mild wave conditions to offshore migration in stormy waves is consistent with an earlier study (Spielmann et al, 2011).…”

Section: Effect Of Wave Heightsupporting

confidence: 91%

An idealised study for the evolution of a shoreface nourishment

Chen

Dodd

2019

Continental Shelf Research

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“…Field measurements detailed the phenomena of hydrodynamic and morphological evolution of the nearshore area [34] with structures [35,36], beach nourishment [37][38][39][40], and shoreface nourishment [41][42][43][44][45][46], which also provided the foundation for the establishment of prediction models using numerical simulation [47][48][49][50][51][52]. Basin experimental models were scaled down from the prototype to test the influence of engineering scenarios on both cross-shore and long-shore processes [53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Experimental Observation on Beach Evolution Process with Presence of Artificial Submerged Sand Bar and Reef

Kuang

Han

et al. 2020

JMSE

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For observation on the influence mechanism of environmentally and aesthetically friendly artificial submerged sand bars and reefs in a process-based way, a set of experiments was conducted in a 50 m-long flume to reproduce the cross-shore beach morphodynamic process under four irregular wave conditions. The beach behavior is characterized by the scarp (indicating erosion) and the breaker bar (indicating deposition), respectively, and the scarp location can be formulated as a linear equation regarding the natural exponential of the duration time. Overall, main conclusions are: (1) the cross-shore structure of significant wave height and set-up is mainly determined by the artificial reef (AR); (2) the cross-shore distribution of wave skewness, asymmetry, and undertow (indicating shoaling and breaking) is more affected by the artificial submerged sand bar (ASB); (3) the ASB deforms and loses its sand as it attenuates incident waves, which leads to a complex sediment transport pattern; (4) the scarp retreat is related to the beach state, which can be changed by the AR and the ASB; (5) the AR, the ASB, and their combination decrease wave attack on the beach. In conclusion, this study proves positive effects of the AR and the ASB in beach protection through their process-based influences on beach behaviors and beach states for erosive waves.

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2017

Marine Geo-Hazards in China

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Analysis of submerged bar nourishment strategies in a wave-dominated environment using a 2DV process-based model

Cited by 7 publications

References 25 publications

An idealised study for the evolution of a shoreface nourishment

An idealised study for the evolution of a shoreface nourishment

Experimental Observation on Beach Evolution Process with Presence of Artificial Submerged Sand Bar and Reef

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