Stability of Rubble Mound Breakwaters—A Study of the Notional Permeability Factor, Based on Physical Model Tests

Eldrup, Mads Røge; Andersen, Thomas Lykke; Burcharth, Hans F.

doi:10.3390/w11050934

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…However, over the years, the experimental dispersion of the data promoted both the identification of the sources of uncertainty and the re-analysis of such formulas. In the context of the present work (wave energy dissipation), two proposals are remarkable: the notional permeability, P [30], and/or the partial coefficients γ, to "quantify" the dependence of the results on the permeability and the geometric configuration and type of armor of the main armor layer and the characteristics of the core [31,32]. Intriguingly, P and the coefficients γ, depend again on the Iribarren number.…”

Section: Introductionmentioning

confidence: 99%

Bulk Wave Dissipation in the Armor Layer of Slope Rock and Cube Armored Breakwaters

Clavero

Díaz-Carrasco

Losada

2020

JMSE

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The objective of this research is to analyze the interaction of the incident wave train with a mound breakwater (specifically, dissipation in the armor layer) and to quantify the performance of the structure built with different types and sizes of armor units. The generalized Π -Buckingham theorem is invoked to choose a complete set of independent variables that govern the principal interaction processes. The analysis is based on two sets of experimental data obtained in the wave flume of IISTA, University of Granada, and in the wave flume of Aalborg University. The bulk dissipation depends on the product of the relative water depth and the incident wave steepness, (h/L)(HI/L), the relative size of the armor diameter, Da/HI, the relative thickness, e/L, the shape and specific placement criterion, the characteristics of the porous core, B*/L, D50,p/L, and the slope angle of the breakwater. For a given breakwater, the product of (h/L)(HI/L) can be used to identify and quantify three hydrodynamic performance regimes: reflective, dissipative and transitional, based on the prevalent interaction processes. Moreover, the dimensional analysis provides a functional relationship between the stability parameter and the bulk dissipation. For two mound breakwaters, one built with cubes of Da=49.6 mm and the other one with rocks of Da=44.0 mm, the bulk dissipation is almost similar over the entire range of (h/L)(HI/L). These results could be useful for the assimilation of data obtained in different wave flumes, the optimization of the breakwater design and to revise the notional permeability parameter.

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Section: Introductionmentioning

confidence: 99%

Bulk Wave Dissipation in the Armor Layer of Slope Rock and Cube Armored Breakwaters

Clavero

Díaz-Carrasco

Losada

2020

JMSE

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“…Eldrup et al [15] deals with the role of notational permeability factor (NPF) in the hydraulic stability of rubble mound breakwaters. NPF is a leading variable of the widely employed van der Meer stability formulae [16] and has been introduced to globally account for the water seepage at a given cross-section material assemblage (including armor, underlayers, and core).…”

Section: Rubble Mound Breakwaters: Effect Of Permeability and Dynamic...mentioning

confidence: 99%

“…However, the original work by van der Meer indicated only four typical values of NPF, thereby creating some uncertainty in the engineering applications. Based on the analysis of new physical model tests conducted at Aalborg University (Denmark), the authors in [15] provide NPF values for seven different layer compositions and propose a pragmatic empirical method to help estimate the permeability parameter in non-tested situations.…”

Section: Rubble Mound Breakwaters: Effect Of Permeability and Dynamic...mentioning

confidence: 99%

Interaction between Waves and Maritime Structures

Buccino

Martinelli

2020

Water

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“…The permeability is a further important element for the main performance variables (i.e., waves reflection, transmission, and dissipation), the extent of which depends on the flow around and inside the structure [18,22,23], and for their stability [24,25]. These aspects reveal that wave reflection, due to the armoring of seawalls with RMBs, is of crucial importance.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Reflection Coefficient for Seawalls Protected by a Rubble Mound Structure

Pratola

Rinaldi

Molfetta

et al. 2021

JMSE

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Sea wave reflection from coastal protection structures is one of the main issues in the coastal design process. Several empirical formulas have been proposed so far to predict reflection coefficient from rubble mound breakwaters and smooth slopes. The aim of this study is to investigate wave reflection from a rubble mound structure placed in front of a vertical concrete seawall. Several experimental tests were performed on a two-dimensional wave flume by reproducing on a rubble mound structure with a steep single primary layer armored with a novel artificial unit. A new approach for the prediction of the reflection coefficient based on dimensional analysis is also proposed, and a new empirical equation is derived. The performance of the proposed equation was compared with widespread existing formulas, and a good accuracy was found.

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Stability of Rubble Mound Breakwaters—A Study of the Notional Permeability Factor, Based on Physical Model Tests

Cited by 10 publications

References 13 publications

Bulk Wave Dissipation in the Armor Layer of Slope Rock and Cube Armored Breakwaters

Bulk Wave Dissipation in the Armor Layer of Slope Rock and Cube Armored Breakwaters

Interaction between Waves and Maritime Structures

Investigation on the Reflection Coefficient for Seawalls Protected by a Rubble Mound Structure

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