Prediction of extreme and tolerable wave overtopping discharges through an advanced neural network

Zanuttigh, Barbara; Formentin, Sara Mizar; Meer, Jentsje W. van der

doi:10.1016/j.oceaneng.2016.09.032

Cited by 74 publications

(69 citation statements)

References 20 publications

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“…The data are compared to existing prediction methods in terms of q and K r in Sections 3.1 and 3.2, respectively. For q, the EurOtop equations [28] and the artificial neural network (ANN) developed by the authors [31][32][33] were considered. The data of K r were instead compared to the formula by Zanuttigh and van der Meer [34] and to the ANN.…”

Section: Verification Of the Datamentioning

confidence: 99%

“…The lower agreement found for the experimental data is principally caused by the underestimation bias at R c /H s = 0, as it can be appreciated by Figure 3. The data were further checked against the predictions of q obtained with the ANN predicting tool [30,32,33]. Differently from the EurOtop equations, the ANN can be applied to structures at negative freeboard as well, but still in dry landward conditions exclusively.…”

Section: Wave Overtopping Dischargementioning

confidence: 99%

“…The values of q associated to the numerical dataset (σ % = 27% and R 2 = 0.81) are more scattered but still fairly represented by the ANN, as almost all the data fall within the 90% confidence bands (dashed lines in Figure 4) and no significant bias is observable. The data were further checked against the predictions of q obtained with the ANN predicting tool [30,32,33]. Differently from the EurOtop equations, the ANN can be applied to structures at negative freeboard as well, but still in dry landward conditions exclusively.…”

Section: Wave Overtopping Dischargementioning

confidence: 99%

See 2 more Smart Citations

Flow Depths and Velocities across a Smooth Dike Crest

Formentin

Gaeta

Palma

et al. 2019

Water

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This contribution proposes a systematic analysis of the overtopping process at dikes, focused on the statistical description of the extreme flow characteristics across the dike crest. The specific objective of the analysis is the investigation of structures subjected to high run-up levels and low freeboards, under severe or extreme conditions that are likely to occur in the future due to climate change. The adopted methodology is based on the collection of new experimental and numerical tests of wave overtopping at smooth dikes at various crest levels. The reliability of the new data is checked in terms of average overtopping discharge and wave reflection coefficient, against consolidated predicting methods from the literature. An update and refitting of the existing formulae for the prediction of the extreme flow depths and velocities at the dike off-shore edge is proposed based on the experimental and numerical outcomes. The dynamics of the overtopping flow propagation along the dike crest under breaking and non-breaking waves, in emerged and submerged conditions, is investigated. Guidelines to update the state-of-the-art formulae for a more cautious estimation of the water depths and the velocities of propagation of the flow in the landward area are provided.

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Section: Verification Of the Datamentioning

confidence: 99%

Section: Wave Overtopping Dischargementioning

confidence: 99%

Section: Wave Overtopping Dischargementioning

confidence: 99%

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Flow Depths and Velocities across a Smooth Dike Crest

Formentin

Gaeta

Palma

et al. 2019

Water

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“…The experimental dataset address by the CLASH European project is described by Van der Meer et al [9]. Recently, van Gent et al [10] and Zanuttigh et al [11] developed neural network systems that predict the overtopping for complicated structure geometries and variable wave conditions, on the basis of a homogeneous and wide database of measurements that trains the network Verhaeghe et al [12].…”

Section: Introductionmentioning

confidence: 99%

Flooding of Piazza San Marco (Venice): Physical Model Tests to Evaluate the Overtopping Discharge

Ruol

Favaretto

Volpato

et al. 2020

Water

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This paper aims at evaluating the wave overtopping discharge over the pavement of “Piazza S. Marco” (Venice) in order to select the best option to mitigate the risk of flooding of the Piazza and to protect the monuments and historic buildings, e.g., the “Basilica S. Marco”. In fact, the MO.S.E. (MOdulo Sperimentale Elettromeccanico) system is designed to keep the water level below a certain value, for the safety of the lagoon, but it does not guarantee the defence of the Piazza, where flooding is still possible, being its pavement locally much lower than the maximum expected water level. To completely defend the Piazza, specific additional works are planned to prevent the back-flow through the natural drainage system (now the primary pathway) or by filtration or by overtopping. This paper investigates on the overtopping mechanism, under conditions compatible with a fully operational MO.S.E. system, through 2-D experiments. The pavement of the Piazza is gently sloping towards the masonry quay which, in some parts is formed by 5 descending steps, and in some other parts, is just a vertical wall. Close to the “Marciana” Library, a critical part is present, with a slightly lower crest freeboard. In total, three cross-sections were examined in the 36 m long wave flume of the Padova University. The test programme includes 10 irregular wave attacks and three different water levels. The test results differ considerably from the results of the available formulas, since the investigated cross-sections by far exceed their range of applicability. The presence of the steps affects only the reflection coefficient rather than the overtopping discharges. In general, if the waves incident to the Piazza are higher than 40 cm, which is a possible scenario, some other adaptation works must be considered, such as the pavement rise, temporary barriers or the reduction of the waves impacting the quay through, for instance, floating breakwaters.

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“…Sea dikes are an effective engineered sea defense, which have been widely used in coastal areas. As sand is readily available in these regions, many sea dikes were filled by sand [1][2][3]. Due to rapid erosion characteristics, there are many problems with sand-built sea dikes.…”

Section: Introductionmentioning

confidence: 99%

Statistical Damage Constitutive Model for Cemented Sand considering the Residual Strength and Initial Compaction Phase

Tan

Yuan

Yong-sheng

et al. 2018

Advances in Civil Engineering

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Based on continuum damage mechanics and the assumption of volume invariance, a damage constitutive model of cemented sand under triaxial stress was established while considering residual strength. Statistical theory was then introduced into this model. Assuming that the microunit strength of cemented sand obeys a Weibull random distribution, an expression of microunit strength based on the Mohr–Coulomb criterion was derived. Additionally, a damage evolution equation and a statistical damage constitutive model of cemented sand under triaxial stress were established. In order to consider the nonlinear deformation and volume change in the initial pore compaction stage, the critical point reflecting the completion of the initial compaction stage was determined. This was done by applying the volume invariance assumption to the linear portion of the stress and strain curve and performing a coordinate transformation. The nonlinearity of the initial compaction stage was fitted by a quadratic function. A triaxial compression test of cemented sand was then carried out to verify this proposed method. The results show that the calculated values by the damage constitutive model fit well with the actual experimental values and that the calculated results can reflect the stress softening, residual strength, and initial compaction characteristics of cemented sand, which shows the rationality and feasibility of the model.

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Prediction of extreme and tolerable wave overtopping discharges through an advanced neural network

Cited by 74 publications

References 20 publications

Flow Depths and Velocities across a Smooth Dike Crest

Flow Depths and Velocities across a Smooth Dike Crest

Flooding of Piazza San Marco (Venice): Physical Model Tests to Evaluate the Overtopping Discharge

Statistical Damage Constitutive Model for Cemented Sand considering the Residual Strength and Initial Compaction Phase

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