Numerical Study of Influences of Onshore Wind on Hydrodynamic Processes of Solitary Wave over Fringing Reef

Guo, L.; Qu, Kun; Huang, J. X.; Li, X. H.

doi:10.3390/jmse10111645

Cited by 8 publications

(2 citation statements)

References 50 publications

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“…By imposing wind shear stress on the ocean surface using an empirical formula, Di Leo et al [17] evaluated the effect of wind on wave overtopping of vertical walls. In recent years, high-resolution two-phase flow solvers have been applied to analyze the complex phenomena within wave-wind interactions, such as the effects of winds on wave transformation [18], wave overtopping [19], wave breaking [20], wave hydrodynamics of fringing reefs [21], and the joint impact of wind and waves on coastal structures [22].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Loads and Overtopping Processes of a Coastal Seawall under the Coupled Impact of Extreme Waves and Wind

Yuan,

Wang,

et al. 2023

JMSE

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Driven by strong winds, huge ocean waves can cause devastating destruction to coastal regions during harsh weather events. There is growing evidence showing that extreme waves can occur in both shallow and deep waters. To protect the coast against the destructive power of huge waves, coastal protection facilities, such as seawalls, are often built along the coast. The integrity and stability of these coastal protection facilities are essential to the safety of coastal regions. Since huge waves are often accompanied by strong winds in real ocean environments, to fill the knowledge gap left by previous relevant studies, this study numerically investigates the hydrodynamic loads and overtopping of a coastal seawall model on a sloped beach under the coupled impact of an extreme wave group and wind. The influences of several main factors are considered, such as water depth, wind speed, and significant wave height. The research results reveal that strong wind can greatly increase the average overtopping rate and enhance the hydrodynamic loads exerted by the extreme wave group on the seawall.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic Loads and Overtopping Processes of a Coastal Seawall under the Coupled Impact of Extreme Waves and Wind

Yuan,

Wang,

et al. 2023

JMSE

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“…However, the currents can be shaped by winds significantly or even dominantly for the whole water column in very shallow waters and more sheltered regions, such as lagoons in reefs (Guo et al, 2022;Pinazo et al, 2004). Waves are found to affect the coastal currents in many physical processes, such as the spatial gradient of radiation stress that causes a gradient of water level and therefore drives the nearshore current (Battjes, 1974;Longuet-Higgins & Stewart, 1962) and wave-current nonlinear interaction (Soulsby et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling on wave-current flows and bed shear stresses over an algal reef

Lan

Huang

2023

Preprint

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Numerical modeling on the depth-averaged currents and bed shear stresses over an algal reef was performed using a coupled wave-current model (Delft-3D). The modeled results were validated and compared to the field observed data, and two numerical cases with and without wind forcing were tested. Oceanographic and meteorological conditions on the shallow reef were wind speed of up to 12 m/s, significant wave height of up to 2 m, water depth of 3 m, and current speed within 0.4 m/s. The model considers hydrodynamic forcing in terms of tides, waves, wind stresses, and bed friction; the depth-averaged currents and bed shear stresses are generally well reproduced by the model. We found that tide is the primary factor driving the current in shallow waters; however, the currents are also significantly affected by wind speeds and the directions between the wind and currents during the high wind events. Two models were chosen to study the bed shear stress induced by wave-current nonlinear interaction and to test the nonlinear enhancement of bed shear stress by waves. Compared to the observed data, we found a significant difference between the two models in predicting bed shear stresses. The results highlight a critical role of the nonlinear interaction between waves and currents in predicting the bed shear stresses during conditions of high wave orbital motions; improvement of the present wave-current nonlinear interaction model for predicting the bed shear stresses may be needed.

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Numerical modeling on wave–current flows and bed shear stresses over an algal reef

Lan,

Huang

2024

Environ Fluid Mech

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Currents in coastal zones under multiple mechanisms in terms of tides, waves, wind, and high roughness are difficult to model; bed shear stresses under wave–current flows are particularly challenging yet not being well studied. Few studies reported the modeling and validation of the bed shear stress in reef environments. In this paper, we present the first direct assessment of numerical modeling on depth-averaged currents and bed shear stresses over an algal reef using a coupled wave–current model (Delft-3D). The modeled results were validated and compared to the field observed data. The model considers hydrodynamic forcing in terms of tides, waves, wind stresses, and bed friction. Results show that the model generally reproduces the depth-averaged currents and bed shear stresses when considering all the mechanisms. Two numerical cases with and without wind forcing were tested to examine the effects of the winds. We found that the tide is mostly the primary factor driving the current, even in shallow waters within a depth of 3 m; however, the currents are also significantly affected by wind speeds and wind directions during high-wind events. When the wind direction is in the same direction as the tidal current, the current speed increases, suggesting the importance of the wind stress on the coastal currents. In addition, two models were chosen to study the nonlinear enhancement of bed shear stress by waves. We found a significant difference between the two models in predicting the bed shear stresses compared to the observed data. Nonlinear contribution from wave enhances the magnitude of bed shear stresses, which reduces the model error. The results highlight the nonlinear interaction between waves and currents is meaningful in predicting the bed shear stresses during high-wave-orbital motions; improvement of the present wave-current nonlinear interaction model for predicting the bed shear stresses may be needed.

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Numerical Study of Influences of Onshore Wind on Hydrodynamic Processes of Solitary Wave over Fringing Reef

Cited by 8 publications

References 50 publications

Hydrodynamic Loads and Overtopping Processes of a Coastal Seawall under the Coupled Impact of Extreme Waves and Wind

Hydrodynamic Loads and Overtopping Processes of a Coastal Seawall under the Coupled Impact of Extreme Waves and Wind

Numerical modeling on wave-current flows and bed shear stresses over an algal reef

Numerical modeling on wave–current flows and bed shear stresses over an algal reef

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