Time dependent investigation of the wave induced scour at the trunk section of a rubble mound breakwater

Temel, Ali; Dogan, Mustafa

doi:10.1016/j.oceaneng.2020.108564

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…Moreover, the results show that beach nourishment must be considered as a real winning tool for coastal protection. Ali Temel and Mustafa Dogan [9] have studied wave-induced local scour at the toe of rubble mound breakwaters placed on an erodible seabed both experimentally and numerically. Time-dependent scour depth and wave characteristics in a laboratory flume were observed with ultrasonic methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Measures for Protecting the Go-Cong Coastlines (Vietnam) from Erosion

San

Duong

Phong

et al. 2022

Water

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Every year, in the Vietnam Mekong Delta Coastal Zone (VMDCZ), erosions cause approximately 300 ha of agricultural land loss. Therefore, measures for shoreline protection are urgently needed. This paper discusses the impacts of protection measures in the Go-Cong Coastal Zone to prevent erosion/accretion processes, predicted by two numerical models, MIKE21-FM and TELEMAC-2D. Hard and soft measures have been proposed using breakwaters and sandbars, respectively. The simulations show that the erosion/accretion trends provided by both models are similar. For breakwaters, MIKE21-FM provides less accretion than TELEMAC-2D in areas extending over 300 m and 500 m from shorelines. However, for sandbars, MIKE21-FM shows higher accretion within areas extending over 500 m but less than 300 m. Sandbars cause higher accretion in a larger area, extending over 1000 m offshore. The simulation results allow us to propose two alternative measures: (1) a row of several breakwater units will be implanted at 300 m offshore. The length of each unit is 600 m, with a gap between two neighbouring units of 70 m and a crest elevation of 2.2 m above mean sea level (MSL). (2) A row of sandbar units will be posed at 500 m offshore, with a unit length of 1000 m and a gap between the two neighbouring units of 200 m. The crest elevation is fixed at MSL.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Measures for Protecting the Go-Cong Coastlines (Vietnam) from Erosion

San

Duong

Phong

et al. 2022

Water

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“…where μ f represents the fluid viscosity and μ * is the average viscosity of the critical fraction of nonadhesive sediments particles. e perceived density, ρ , is assumed as a linear function of the sediments volume, where ρ s and ρ L are the apparent densities of the sediment and the fluid [17]. Drift is defined as sediment particles deposition under the influence of the drift forces affecting the sediment particle.…”

Section: Theoretical Approachmentioning

confidence: 99%

Hydrodynamic Performance of A‐Jacks Concrete Armor Units in Riverbeds around Downstream in Flip Buckets

Khalifehei

Azizyan

Shafai-Bajestan

2021

Shock and Vibration

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The jet flipped from flip buckets hits the dam’s downstream side as a free jet with an immense amount of energy, leading to bed erosion. Erosion of river bed materials downstream of dams could affect the performance of dams or power plants by altering the tailwater depth, rendering proper designs of controlling structures or erosion reduction methods highly indispensable in this regard. Hence, the hydrodynamic performance of A-Jacks concrete armor units in controlling scour was examined in this study. A-Jacks armors are applicable as a flexible protection without environmental risks often for bed erosion control. The desirable functionality of A-Jacks armors depends on the flow hydrodynamic parameters such as velocity profile variations ( U / U B ), the Reynolds stresses ( τ u ′ w ′ and τ v ′ w ′ ), and the skin friction coefficient ( C f ) created as a consequence of using A-Jacks armors on beds. The size of A-Jacks elements can have a role in increasing the flow turbulence to a certain depth so that after the impact of the flow with A-Jacks armor, the vortices’ intensity as well as the shear stress affecting the bed gradually decreases. The results of the numerical model suggest that the surge in the flow turbulence energy dissipation downstream of flip buckets significantly mitigates the underlying conditions of scouring phenomena, which is evidence of A-Jacks armors’ acceptable performance in scaling down scour depths.

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“…Despite the problems and issues that still arise in the experimental testing of the seabed response, several studies have investigated sediment transport and the scour around maritime structures. Sutherland et al [14], Pearce et al [15], Tsai et al [16], Jayaratne et al [17] studied scour around vertical and sloping seawalls, and Sutherland et al [18,19], Sumer and Fredsøe [20], Fausset [21], Temel and Dogan [22] tested the seabed response around rubble-mound breakwaters.…”

Section: Introductionmentioning

confidence: 99%

Advances in Numerical Reynolds-Averaged Navier–Stokes Modelling of Wave-Structure-Seabed Interactions and Scour

Díaz-Carrasco

Croquer

Tamimi

et al. 2021

JMSE

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This review paper presents the recent advances in the numerical modelling of wave–structure–seabed interactions. The processes that are involved in wave–structure interactions, which leads to sediment transport and scour effects, are summarized. Subsequently, the three most common approaches for modelling sediment transport that is induced by wave–structure interactions are described. The applicability of each numerical approach is also included with a summary of the most recent studies. These approaches are based on the Reynolds-Averaged Navier–Stokes (RANS) equations for the fluid phase, and mostly differ in how they tackle the seabed response. Finally, future prospects of research are discussed.

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Time dependent investigation of the wave induced scour at the trunk section of a rubble mound breakwater

Cited by 7 publications

References 11 publications

Numerical Study on Measures for Protecting the Go-Cong Coastlines (Vietnam) from Erosion

Numerical Study on Measures for Protecting the Go-Cong Coastlines (Vietnam) from Erosion

Hydrodynamic Performance of A‐Jacks Concrete Armor Units in Riverbeds around Downstream in Flip Buckets

Advances in Numerical Reynolds-Averaged Navier–Stokes Modelling of Wave-Structure-Seabed Interactions and Scour

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