Estimation of Incident and Reflected Wave Trains in Highly Nonlinear Two-Dimensional Irregular Waves

Eldrup, Mads Røge; Andersen, Thomas Lykke

doi:10.1061/(asce)ww.1943-5460.0000497

Cited by 20 publications

(40 citation statements)

References 19 publications

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“…Transmission coefficient (K 2 T ) was computed directly from gauge G6. At AAU, the method of Eldrup and Andersen [44] was applied to calculate the incident and reflected wave spectrum. The SIRW method of Frigaard and Brirsen [45] was used to calculate the time domain incident and reflected wave trains.…”

Section: Methodsmentioning

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: Methodsmentioning

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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“…Wave gauges were placed in front of the breakwater in order to separate waves into incident and reflected waves. The wave separation method by Eldrup and Lykke Andersen (2019) was used, which is a nonlinear method that separates the wave components not only into incident and reflected components but also into free and bound components. The method has on mild foreshore slopes shown to be reliable for the entire interval from linear to highly nonlinear waves.…”

Section: Model Test Setup and Test Conditionsmentioning

confidence: 99%

Overtopping on Breakwaters With a Permeable Crest

Eldrup¹,

Andersen²,

Thomsen³

et al. 2018

Int. Conf. Coastal. Eng.

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In model tests, the wave overtopping discharge is typically measured at the rear corner of the armour crest. So far, all overtopping formulae have been calibrated to predict this specific overtopping discharge. The EurOtop Manual however proposed a formula to include also the discharge trough the permeable armour crests. The total overtopping including the discharge trough the crest armour is relevant in relation to rear armour stability. The discharge trough the armour depends also on the permeability of the core material. In order to study this effect, new model tests were performed with a permeable and an impermeable core. A method for the prediction of the total overtopping discharge is given.

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“…In such a case it would be recommended to also measure the waves at the toe without the structure in place. The nonlinear method by Eldrup and Lykke Andersen [19] was used to separate the incident and reflected waves. As opposed to the methods of Goda [20] and Mansard and Funke [21] this separation method includes both bound and free components and amplitude dispersion, which is essential for accurate determination of low exceedance wave parameters, for example H 2% , in nonlinear sea states.…”

Section: Wave Generation and Wave Analysismentioning

confidence: 99%

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

Eldrup

Andersen

Burcharth

2019

Water

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The Van der Meer formulae for quarry rock armor stability are commonly used in breakwater design. The formulae describe the stability as a function of the wave characteristics, number of waves, front slope angle and rock material properties. The latter includes a so-called notional permeability factor characterizing the permeability of the structure. Based on armor stability model tests with three armor layer compositions, Van der Meer determined three values of the notional permeability. Based on numerical model results he added for a typical layer composition one more value. Based on physical model tests, the present paper provides notional permeability factors for seven layer compositions of which two correspond to the compositions tested by Van der Meer. The results of these two layer compositions are within the scatter of the results by Van der Meer. To help determination of the notional permeability for non-tested layer compositions, a simple empirical formula is presented.

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Estimation of Incident and Reflected Wave Trains in Highly Nonlinear Two-Dimensional Irregular Waves

Cited by 20 publications

References 19 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

Overtopping on Breakwaters With a Permeable Crest

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

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