Effects of submerged berms on the stability of conventional rubble mound breakwaters

Celli, Daniele; Pasquali, Davide; Girolamo, Paolo De; Risio, Marcello Di

doi:10.1016/j.coastaleng.2018.01.011

Cited by 27 publications

(25 citation statements)

References 21 publications

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“…In particular, arrangement of Antifer-type blocks [6] is suggested (and tested as well) as a protection system downstream of dams. Antifer-type blocks are used in the maritime constructions field to deploy the armor layers of rubble mound breakwaters subjected to breaking wave conditions [7]. The block has four grooves and a slightly tapered shape, so that it can be easily released from the mold.…”

Section: Problem Definition and The Case Study Of Liscione Dammentioning

confidence: 99%

Riverbed Protection Downstream of an Undersized Stilling Basin by Means of Antifer Artificial Blocks

Castellino

Moroni

Cimorelli

et al. 2021

Water

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Erosion at either dam or spillway foundations, destabilization in riverbanks, and damage in the natural environment located downstream of either dams or spillways represent crucial elements to be taken into account in the risk assessment of hydraulic structures. One of the main problems is related to the scouring that water flow may induce at the downstream boundary of spillways. This issue is exacerbated in the case of undersized stilling basins, i.e., when a significant level of energy migrates downstream by acting on unprotected natural riverbed. If the scour depths are large enough, the structural stability of the infrastructure will be threatened. This paper aims to illustrate an innovative technical solution suitable to protect the riverbed located just downstream of stilling basins by means of artificial Antifer blocks. These kinds of artificial blocks are widely used in the field of maritime construction, but in the literature, there are no theoretical formulations for their design within the frame of river engineering. In order to demonstrate the efficacy of the proposed technical solution, it is applied to a real case investigated by means of physical modeling. The riverbed located just downstream of the stilling basin of Liscione Dam (Campobasso, Italy) experienced scour due to high discharges during and after extreme rain events. Different protection strategies have been tested to assess the influence of different placement methods and packing densities on the stability of Antifer block armor layers. Experimental findings reveal that regular placements behave more stable than irregular placements with a similar packing density.

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Section: Problem Definition and The Case Study Of Liscione Dammentioning

confidence: 99%

Riverbed Protection Downstream of an Undersized Stilling Basin by Means of Antifer Artificial Blocks

Castellino

Moroni

Cimorelli

et al. 2021

Water

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“…For the design of rubble mound breakwaters, it is important to analyze the structure response under environmental loads such as waves and currents (e.g., [1][2][3][4]), as well as storm surge events (e.g., [5,6]). Van Gent [7] and Celli et al [8] argued that introducing a berm in the seaward side of rubble mound breakwaters can increase the stability of the rocks in the armor layer. Their research studies revealed that the presence of the berm enhances the wave energy dissipation before the waves reach the armor layer, leading to a reduced rock diameter required for the stability, compared with conventional rubble mound breakwaters.…”

Section: Introductionmentioning

confidence: 99%

Random Wave-Induced Momentary Liquefaction around Rubble Mound Breakwaters with Submerged Berms

Celli

Ong

et al. 2020

JMSE

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The effects of submerged berms in attenuating the momentary liquefaction beneath rubble mound breakwaters under regular waves were investigated in a recent study. The present work aims to investigate the momentary liquefaction probabilities around and beneath breakwaters with submerged berms under random waves. The interaction between waves and breakwaters with submerged berms has been simulated through a phase-resolving numerical model. The soil response to the seabed pressure induced by random waves has been investigated using a poro-elastic soil solver. For three different breakwater configurations, the liquefaction depths under random wave conditions have been compared with those cases under representative regular waves. In the present study, the offshore spectral wave height ( H m 0 ) and the peak period ( T p ) of irregular waves are used as representative regular wave parameters. Results reveal the importance of considering random waves for a safe estimation of the momentary liquefaction probability. Indication about the minimum number of random waves, which is required to properly catch the liquefaction occurrences, has been also addressed.

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“…Several methods, ranging from standard rubble mound breakwaters (e.g., [5,6]) up to low-environmental impact solutions (e.g., beach nourishments, artificial reefs and by-pass systems (e.g., [7][8][9][10])), are typically deployed to recover and protect beaches from erosion. However, effects of defence work are not always sustainable under both environmental and economical points of view.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on the Evolution of a Sandy Beach Nourishment Protected by a Mixed Soft–Hard System

Saponieri

Valentini

Risio

et al. 2018

Water

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A new experimental campaign on a 2D movable-bed physical model, reproducing a typical nourishment sandy beach profile, is being carried out in the wave flume of the Laboratory of Coastal Engineering at Politecnico di Bari (Bari, Italy). The main aim is to assess the short-term evolution of a sandy beach nourishment, relying on a mixed solution built on the deployment of a Beach Drainage System (BDS) and a rubble-mound detached submerged breakwater. This paper aims at illustrating the experimental findings. Tests presented herein deal with both unprotected and protected configurations, focusing on the hydrodynamic and morphodynamic processes under erosive conditions. Results show that, with respect to the unprotected conditions, BDS reduces the shoreline retreat and the beach steepen within swash and surf zone as well. Moreover, a reduction of net sediment transport rate is observed. When BDS is coupled with the submerged sill, a reversal of the prevalent direction of the net sediment transport seaward occurs offshore the sheltered region. Less considerable positive effects on shoreline retreat are induced by the submerged structure, whereas the mean beach slope remains quite stable. Secondary effects of drain on the submerged sill performance are also highlighted. BDS reduces wave-induced setup on beach, by mitigating the mean water level raising, typically experienced by such structures.

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Effects of submerged berms on the stability of conventional rubble mound breakwaters

Cited by 27 publications

References 21 publications

Riverbed Protection Downstream of an Undersized Stilling Basin by Means of Antifer Artificial Blocks

Riverbed Protection Downstream of an Undersized Stilling Basin by Means of Antifer Artificial Blocks

Random Wave-Induced Momentary Liquefaction around Rubble Mound Breakwaters with Submerged Berms

Laboratory Investigation on the Evolution of a Sandy Beach Nourishment Protected by a Mixed Soft–Hard System

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