An Integrated Numerical Model for the Design of Coastal Protection Structures

Karambas, Theophanis V.; Samaras, Achilleas G.

doi:10.3390/jmse5040050

Cited by 23 publications

(17 citation statements)

References 40 publications

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“…To combat the adverse effects of erosion, coastal protection works (e.g., breakwaters, groins, and seawalls) have been constructed by engineers focusing predominantly on reducing the incident wave energy. In order to optimize the layout and configuration of coastal protection schemes, numerical models [7][8][9][10][11][12][13][14] are of paramount importance to simulate the coastal processes taking place in a coastal area. Although several numerical models are available nowadays, researchers and the engineering community still to this day develop and utilize numerical models, with the aim to simulate even more coastal processes and minimize the required computational resources.…”

Section: Introductionmentioning

confidence: 99%

Integrated Modeling of Coastal Processes Driven by an Advanced Mild Slope Wave Model

Chondros,

Metallinos,

Papadimitriou

2024

Modelling

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Numerical modeling of wave transformation, hydrodynamics, and morphodynamics in coastal regions holds paramount significance for combating coastal erosion by evaluating and optimizing various coastal protection structures. This study aims to present an integration of numerical models to accurately simulate the coastal processes with the presence of coastal and harbor structures. Specifically, integrated modeling employs an advanced mild slope model as the main driver, which is capable of describing all the wave transformation phenomena, including wave reflection. This model provides radiation stresses as inputs to a hydrodynamic model based on Reynolds-averaged Navier–Stokes equations to simulate nearshore currents. Ultimately, these models feed an additional model that can simulate longshore sediment transport and bed level changes. The models are validated against experimental measurements, including energy dissipation due to bottom friction and wave breaking; combined refraction, diffraction, and breaking over a submerged shoal; wave transformation and wave-generated currents over submerged breakwaters; and wave, currents, and sediment transport fields over a varying bathymetry. The models exhibit satisfactory performance in simulating all considered cases, establishing them as efficient and reliable integrated tools for engineering applications in real coastal areas. Moreover, leveraging the validated models, a numerical investigation is undertaken to assess the effects of wave reflection on a seawall on coastal processes for two ideal beach configurations—one with a steeper slope of 1:10 and another with a milder slope of 1:50. The numerical investigation reveals that the presence of reflected waves, particularly in milder bed slopes, significantly influences sediment transport, emphasizing the importance of employing a wave model that takes into account wave reflection as the primary driver for integrated modeling of coastal processes.

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Section: Introductionmentioning

confidence: 99%

Integrated Modeling of Coastal Processes Driven by an Advanced Mild Slope Wave Model

Chondros,

Metallinos,

Papadimitriou

2024

Modelling

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“…Wave propagation and transformation in the near-shore region generate waveinduced currents and the associated sediment Cuxes, which in turn produce a speciBc response of coastal morphology (Horikawa 1988;Short 1992;Wolf and Prandle 1999;R o_ zy nski, et al 2001;Treffers 2008). The near-shore currents are of particular interest in coastal engineering as they are the primary transport mechanisms of materials in the coastal environment (Sasaki and Horikawa 1978;Basco 1983;Karambas and Samaras 2017). These processes are always mutually dependent and constitute a sophisticated system of non-linear interactions.…”

Section: Introductionmentioning

confidence: 99%

Investigation of near-shore processes along North Goa beaches: A study based on field observations and numerical modelling

et al. 2021

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The dynamic coastal environment comprising of near-shore zone and beach continuously undergoes substantial morphological changes due to man-made and natural processes. These processes are always mutually dependent and therefore understanding their physical mechanisms is complicated. In this study, an attempt has been made to understand the physical interactions between the waves, tides and currents in the near-shore regions of four major tourist beaches of Goa using Beld measurements and numerical modelling. The state-of-the-art instruments were deployed at 6 m water depth, for a fortnight at each beach for two seasons in 2018. In-situ depth data were collected along the 8 km stretch covering Baga to Sinquerim using a mechanised boat equipped with an Echo sounder and a differential global positioning system. A coupled Delft3D model was set up with the model domain created using in-situ bathymetry soundings, beach proBles' elevation and naval hydrographic chart data. Model simulations were performed for two seasons (Jan-Feb) for calibration and (Oct-Nov) for validation by forcing the FLOW and WAVE models with timevarying water levels obtained from the TOPEX/POSEIDON global tide model, wave parameters from European Centre for Medium-range Weather Forecasting data and the measured wind data. The model results were validated by comparing the significant wave height, current speed and water level with the insitu data. From these experiments, it has been observed that near-shore parameters change significantly with the season and are mutually interactive. Especially, the near-shore currents are varying according to the wave heights and water level variations (due to tides). The Delft3D model is capable of addressing the near-shore processes with a good level of accuracy. However, Bne-tuning the model parameters with more seasonal data would help in addressing several coastal processes for any future datasets and therefore could be utilised for investigating and forecasting near-shore processes.

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“…However, research development is still scarce. Little knowledge is known about the interaction between floating breakwater and sediment transport [16]. It is favourable for sites with a large variation in tide and wave directions.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis of cylindrical floating breakwater towards reduction of sediment transport

Fitriadhy¹,

Faiz²,

Abdullah³

2017

J. MECH. ENG. SCI.

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Floating breakwater becomes an alternative and reliable coastal area protection as it is cheaper in production cost as compared to conventional bottom-fixed breakwater. Floating breakwater system would be the best decision in order to control sedimentation that threatens the shore due to erosion. This study proposes to analyse Cylindrical Floating Breakwater (CFB) aimed at gaining a sufficient reduction in the sediment transport rate along the shore (case study at Tok Jembal Beach in Kuala Terengganu) by using CFD approach. Several parameters for the effects of wavelengths and vertical clearance between the CFB and seabed on the gradient of suspended and packed sediment were simulated by using Flow3D. A wave boundary was assigned to give an insight on regular waves effects to the parameters used in the simulation. The results showed that the presence of CFB markedly reduced the concentration and mass of suspended sand, gravel and coarse gravel for the whole range of wavelengths considered. Besides, it was found that varying the relative clearance of the floating breakwater and seabed was particularly sensitive to the concentration and mass of suspended sediment. Meanwhile, the bulk of sediment mass and concentration remain insignificant for the investigated wavelength and vertical clearance. From this standpoint, the cylindrical floating breakwater (CFB) could significantly minimise the gradient of sediment transport along the breakwater-beach distance while its installation depth may be optimised for circumstances to save cost, avoid breaking waves and morphological changes, ship traffic routes and etc.

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An Integrated Numerical Model for the Design of Coastal Protection Structures

Cited by 23 publications

References 40 publications

Integrated Modeling of Coastal Processes Driven by an Advanced Mild Slope Wave Model

Integrated Modeling of Coastal Processes Driven by an Advanced Mild Slope Wave Model

Investigation of near-shore processes along North Goa beaches: A study based on field observations and numerical modelling

Computational fluid dynamics analysis of cylindrical floating breakwater towards reduction of sediment transport

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