Validation and practical application of nonlinear wave decomposition methods for irregular waves

Ridder, Menno P. de; Krämer, Jan; Bieman, Joost P. den; Wenneker, I.

doi:10.1016/j.coastaleng.2023.104311

Cited by 3 publications

(1 citation statement)

References 18 publications

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“…A transition slope was made between the bottom of the flume and the horizontal foreshore. At deep water, seaward of the submerged low-crested structure, and between the LCS and the (emerged) structure, wave gauges were positioned to measure the structure-induced wave setup and to separate incident and reflected waves from the measured surface elevations (based on Zelt andSkjelbreia, 1992, andDe Ridder et al, 2023). The submerged low-crested structures all had a trapezoidal shape with 1:2 slopes and a crest width of B = 0.20 m (see Figure 3).…”

Section: Physical Model Testsmentioning

confidence: 99%

Submerged low-crested structures in front of coastal structures

Van Gent

2024

JCHS

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Climate adaptation of coastal structures has become more important due to climate change, resulting in sea level rise and increased wave loading on coastal structures with depth-limited wave conditions. One of the climate adaptation measures to ensure that existing coastal structures continue to perform their function after unforeseen sea level rise, is to reduce the wave loading before the waves reach the existing coastal structure. This can be achieved by constructing a low-crested structure in front of the existing structure. Between the two structures, structure-induced wave set-up occurs. This structure-induced wave set-up has been studied based on wave flume tests. The effects of structure-induced wave set-up on wave transmission at the low-crested structures and the effects on wave overtopping at the emerged coastal structures were also measured and analyzed.The structure-induced wave set-up depends on the freeboard, wave steepness, and permeability of the low-crested structure. For configurations with impermeable low-crested structures, this wave-set-up does not depend on the distance between the two structures. Empirical expressions to estimate structure-induced wave set-up are derived for impermeable and permeable low-crested structures.The measurements indicate that the effect of structure-induced wave set-up on the wave transmission coefficients is negligibly small.The structure-induced wave set-up increases the wave overtopping discharges at the emerged coastal structure. This effect can be taken into account in wave overtopping estimates by reducing the freeboard with the structure-induced wave set-up.

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Section: Physical Model Testsmentioning

confidence: 99%

Submerged low-crested structures in front of coastal structures

Van Gent

2024

JCHS

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A copula-based model to describe the uncertainty of overtopping variables on mound breakwaters

Mares-Nasarre,

van Gent,

Morales-Nápoles

2024

Coastal Engineering

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Incident component extraction from disturbed waves around large fixed cylindrical structures

Song,

Zhu,

Tai

et al. 2024

Physics of Fluids

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The parameters of incident waves are critical for real-time wave load estimation of structures in service. Nonetheless, it is challenging to characterize incident waves accurately using the measured wave surface elevation around large fixed cylindrical structures due to the interaction with the structure in the wave field. To provide a better understanding of incident waves, which are usually buried in directly measured waves, a new time-domain method for the extraction of first-order and second-order incident waves around large fixed cylindrical structures is proposed. In contrast to most existing separation methods that are suitable for structures with equal reflection coefficients, the amplitude and phase changes of near-field waves around cylindrical structures can be determined by considering the significant diffraction effect, and then the time-frequency characteristic of the wavelet transform is employed, which enables the extraction of incident waves in the time domain. The accuracy of the proposed method is studied using several examples with known incident waves which are generated with the OpenFOAM. The numerical results show that the deviations between the exact and extracted incident waves change from 6.16% to 16.77% for different wave conditions. To further investigate the performance of the proposed method, an experimental study on waves around a mono-pile offshore wind turbine (OWT) is conducted in the laboratory of the Ocean University of China. The predicted results basically agree well with the target waves in terms of amplitude and phase. The deviations between predicted waves using the proposed method and target waves are 110% smaller than those between directly experimental measured waves and target waves for all tested conditions. Finally, 48 h of measured wave data were obtained during calm and typhoon periods around a mono-pile OWT located near Rudong County, Jiangsu Province, in the Yellow Sea of China. There are almost 150% and 30% differences between the extraction results and measured data in the time series and statistical wave heights, respectively, which means that employing disturbed wave data as the input for calculating real-time wave loads leads to deviations that cannot be ignored.

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Validation and practical application of nonlinear wave decomposition methods for irregular waves

Cited by 3 publications

References 18 publications

Submerged low-crested structures in front of coastal structures

Submerged low-crested structures in front of coastal structures

A copula-based model to describe the uncertainty of overtopping variables on mound breakwaters

Incident component extraction from disturbed waves around large fixed cylindrical structures

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