Propagation of waves over a rugged topography

Afzal, Mohammad Saud; Kumar, Lalit

doi:10.1016/j.joes.2021.04.004

Cited by 20 publications

(3 citation statements)

References 37 publications

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“…Some of these studies [20,21,23] used the measured ADCP data from earlier sources or conducted such measurements. There is a wealth of literature from other sites dealing with coastal hydrodynamics and wave propagation in coastal environments [24][25][26].…”

Section: Of 13mentioning

confidence: 99%

Baseline Measurements of Waves and Currents along the Coast of Oman

Sana,

Chitrakar,

Baawain

et al. 2023

JMSE

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The coast of Oman is undergoing huge coastal developments in order to realize Oman Vision 2040, covering all the strategic sectors. Historical data of coastal hydrodynamic parameters is scarce, even though its importance for properly designed coastal structures is recognized. In the present study, Acoustic Doppler Current Profilers (ADCP) were deployed at eleven locations along the coast of Oman. These locations were selected based on their strategic importance for the country. The duration of the deployments were between 60 and 265 days. The measured data of the waves and currents were collected and analyzed using equipment-specific software and Excel. The significant wave heights can reach 2 m along the whole coast of Oman. The southern coast is dominated by swells. The maximum to significant wave height ratio is approximately 1.5, which is less than the value of 2 obtained using the Rayleigh distribution. The coastal currents are stronger along the southern coast than those along the northern coast. The range of current magnitude is between 0.02 m/s and 0.8 m/s. This baseline study will help the public authorities in establishing permanent hydrodynamic measurement stations along the coast of Oman. Moreover, these measurements will serve the practicing engineers in designing coastal structures along the coast of Oman.

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Section: Of 13mentioning

confidence: 99%

Baseline Measurements of Waves and Currents along the Coast of Oman

Sana,

Chitrakar,

Baawain

et al. 2023

JMSE

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“…Soulsby [18] reported that when both waves and currents act together, the waves' phase speed and wavelength become altered due to the influence of the currents, resulting in wave refraction. Additionally, the interaction between the waves and currents in the wave boundary layer increases bed shear stress, forming wave-developed currents [19][20][21]. These wavedeveloped currents are the cause of suspending sediment particles from the seabed in the water [22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Scour around Vertical Wall Abutments with Varying Aspect Ratios under Combined Waves and Current Flows

Kumar,

Afzal

2023

JMSE

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The present study employs numerical simulations to investigate vertical wall abutment scour with different aspect ratios (B/L, where B is the abutment length in the flow direction, and L is the abutment length transverse to the flow direction) under the combined effect of waves and current. The numerical model solves the Reynolds-averaged Navier–Stokes (RANS) equations and incorporates the Exner formulation to account for bed-level changes. The utilization of the Level Set Method (LSM) in the present numerical model enhances the accurate tracking of free surface and sediment bed. The numerical model validation was performed using a truncated numerical wave tank. The validated model was utilized to examine scour around vertical wall abutments with varying aspect ratios under different wave-current flows. The highest and lowest abutment scour depths were observed for aspect ratios of 0.5 and 2, respectively, in both steady current and the combined effects of waves and current. The vertical wall abutment of aspect ratio 0.5 had a maximum normalized equilibrium scour depth (S/B, where S is equilibrium scour depth), primarily attributed to a sharp edge, leading to increased turbulence and forming a strong primary vortex. The results suggest that the increase in the aspect ratio of the vertical wall abutment decreases the normalized equilibrium scour depth (S/B). According to the authors’ knowledge, this study is the first of its kind that utilizes a three-dimensional, semi-coupled model to examine combined wave- and current-flow-induced scour at vertical wall abutments with varying aspect ratios.

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“…Coastal wave propagation is mainly affected by the complex geometry of nearshore zones and the bottom topography. The rugged topography can cause many wave transformations such as wave refraction, diffraction, and breaking as the wave approaches the shoreline [4,5,6]. Wave run-up at the coastline is mainly depends on the offshore wave conditions such as height, length, and velocity of waves and on the coastal geometry and topography [7].…”

Section: Introductionmentioning

confidence: 99%

A numerical model preserving nontrivial steady-state solutions for predicting waves run-up on coastal areas

Karjoun¹,

Beljadid²

2022

Preprint

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In this study, a numerical model preserving a class of nontrivial steady-state solutions is proposed to predict waves propagation and waves run-up on coastal zones. The numerical model is based on the Saint-Venant system with source terms due to variable bottom topography and bed friction effects. The resulting nonlinear system is solved using a Godunov-type finite volume method on unstructured triangular grids. A special piecewise linear reconstruction of the solution is implemented with a correction technique to ensure the accuracy of the method and the positivity of the computed water depth. Efficient semi-implicit techniques for the friction terms and a well-balanced formulation for the bottom topography are used to exactly preserve stationary steady-state s solutions. Moreover, we prove that the numerical scheme preserves a class of nontrivial steady-state solutions. To validate the proposed numerical model against experiments, we first demonstrate its ability to preserve nontrivial steady-state solutions and then we model several laboratory experiments for the prediction of waves run-up on sloping beaches. The numerical simulations are in good agreement with laboratory experiments which confirms the robustness and accuracy of the proposed numerical model in predicting waves propagation on coastal areas.

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Propagation of waves over a rugged topography

Cited by 20 publications

References 37 publications

Baseline Measurements of Waves and Currents along the Coast of Oman

Baseline Measurements of Waves and Currents along the Coast of Oman

Numerical Simulations of Scour around Vertical Wall Abutments with Varying Aspect Ratios under Combined Waves and Current Flows

A numerical model preserving nontrivial steady-state solutions for predicting waves run-up on coastal areas

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