The role of submerged berms on the momentary liquefaction around conventional rubble mound breakwaters

Celli, Daniele; Li, Yuzhu; Ong, Muk Chen; Risio, Marcello Di

doi:10.1016/j.apor.2019.01.023

Cited by 25 publications

(34 citation statements)

References 42 publications

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“…Re-suspension of cohesive sediments is mostly studied in the case of unidirectional or slowly variable currents (e.g., tidal currents), although the action of surface waves sometimes plays a significant role. In particular, the fluctuation of pressure values induced by the waves propagation can weaken and fluidize the sediment at the bottom [71,72]. The erodibility can also vary in relation to other physical, chemical and biological factors, such as the mineralogical composition, the presence of interstitial water and the pH, the ionic composition, the quantity and the type of organic matter in the different types of sediment (e.g., [68]).…”

Section: Sediment Transport and Deposition Modelingmentioning

confidence: 99%

Mathematical Modeling Framework of Physical Effects Induced by Sediments Handling Operations in Marine and Coastal Areas

Lisi

Feola

Bruschi

et al. 2019

JMSE

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In recent years increasing attention has been paid to environmental effects that may result from marine dredging and disposal operations. In general, the fine-grained fraction of handled sediments can be dispersed far from the intervention site as a turbidity plume, depending on the specific site and operational parameters. Starting from a literature review, this paper suggests standards for estimating and characterizing the sediment source term, for setting up far-field modeling studies and analyzing numerical results, with the aim of optimizing, also from an economic point of view, the different project, execution and monitoring phases. The paper proposes an integrated modeling approach for simulating sediment dispersion due to sediment handling operations in different marine-coastal areas (off-shore, near-shore and semi-enclosed basins). Attention is paid to the characterization of sediment source terms due to different operational phases (removal, transport and disposal). The paper also deals with the definition of accuracy level of modeling activities, with regard to the main physical processes characterizing the different marine–coastal areas and to the type of environmental critical issues near the intervention site (if any). The main relationships between modeling and monitoring are given for the different design and management phases to support the selection of appropriate technical alternatives and monitoring actions and to ensure the environmental compliance of the proposed interventions.

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Section: Sediment Transport and Deposition Modelingmentioning

confidence: 99%

Mathematical Modeling Framework of Physical Effects Induced by Sediments Handling Operations in Marine and Coastal Areas

Lisi

Feola

Bruschi

et al. 2019

JMSE

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“…The residual liquefaction, typical of loose sand deposits, occurs when the wave-induced excess of pore water pressure overcomes the overburden pressure, making the soil particles completely unbound [12]. The momentary liquefaction generally occurs in dense sands if the upward pore pressure gradient, induced by wave troughs, overcomes the initial vertical effective stress (e.g., [13]).…”

Section: Introductionmentioning

confidence: 99%

“…Besides increasing the armor layer stability, Celli et al [13] showed that deploying a submerged berm is valuable in reducing wave-induced momentary liquefaction, compared with a straight sloped conventional rubble mound breakwater. In particular, a parametric study was carried out by varying the berm geometry in terms of its height and its length, keeping constant the armor layer and the berm porosity, the elastic soil properties, the offshore regular wave conditions, and the water depth.…”

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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“…The prediction of the waveinduced soil response and liquefaction risk around the offshore foundation is critical in the engineering design. In the recent years, most of the wave-structure-seabed interaction studies have focussed on the coastal and offshore structures such as breakwaters (Jeng 1997;Ulker et al 2010;Ye 2012b;Celli et al 2019) and monopile foundations (Li et al 2011;Chang and Jeng 2014;Zhang et al 2015;Sui et al 2016;Lin et al 2017;Zhao et al 2017;Zhu et al 2018), but very few literature studies have considered the wave-structure-seabed interaction of gravity-based foundations with more complex three-dimensional geometries. Recently, Li et al (2018) studied the seabed consolidation and liquefaction around a hexagonal foundation using an integrated wave-structure-seabed interaction model developed in OpenFOAM.…”

Section: Introductionmentioning

confidence: 99%

The effects of slab geometries and wave directions on the steep wave-induced soil response and liquefaction around gravity-based offshore foundations

Ong

Gudmestad

et al. 2019

Ships and Offshore Structures

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Gravity-based offshore foundations generally consist of a bottom slab and one or more cylindrical shafts on top of it. The slab geometry can strongly affect the surrounding flow pattern, dynamic wave pressure distribution and further momentary soil liquefaction. In the present study, the effects of the slab geometry and the incoming wave angle to the foundations on the surrounding soil response are investigated. Gravity-based foundations with bottom slabs of cylindrical shape and hexagonal prismatic shape are considered. For the hexagonal foundation, two different incoming wave angles, i.e. propagating to the hexagon corner and the edge, are simulated. The waves are fully nonlinear steep non-breaking waves. The wave-structure interaction is validated against an existing experiment. Soil consolidation behaviour underneath the foundations is investigated. It is found that both the slab geometry and the incoming wave angle can affect the distributions of pore pressure and momentary liquefaction depth in the surrounding soil.

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The role of submerged berms on the momentary liquefaction around conventional rubble mound breakwaters

Cited by 25 publications

References 42 publications

Mathematical Modeling Framework of Physical Effects Induced by Sediments Handling Operations in Marine and Coastal Areas

Mathematical Modeling Framework of Physical Effects Induced by Sediments Handling Operations in Marine and Coastal Areas

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

The effects of slab geometries and wave directions on the steep wave-induced soil response and liquefaction around gravity-based offshore foundations

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