Hydrodynamics and Scour around Coastal and Hydraulic Structures under Combined Wave-Current Action

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Coastal Engineering".

Deadline for manuscript submissions: closed (5 September 2023) | Viewed by 4179

Special Issue Editors

Department of Civil Engineering, Indian Institute of Technology, Kharagpur, India
Interests: coastal engineering; Computational Fluid Dynamics; hydraulics; hydrodynamics; sediment transport; Wave-current interaction; scour; Numerical Modeling; Application of Machine Learning in coastal and hydraulic engineering; Coastal Engineering in Arctic Areas
Dept. of Ocean Engineering & Naval Architecture, Indian Institute of Technology Kharagpur, India 721302
Interests: ocean engineering; mathematical modeling; numerical methods; coastal hydrodynamics; hydroelasticity
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Special Issue Information

Dear Colleagues,

This Special issue aims to report the ongoing research into computational, analytical and experimental results in phenomenon related to coastal and ocean engineering with a special emphasis on hydrodynamics and scour around coastal structures. Topics of primary interest include, but are not limited to: mathematical and numerical investigation of turbulence characteristics in coastal areas, CFD modelling (RANS, LES and DNS) of hydrodynamics and scour in rivers and/or oceans, analytical modelling of flows and phenomenon in coastal areas, modelling of dam break flows, long term coastal dynamics, soft computing techniques for phenomenon related to coastal engineering and wave-current interaction in coastal waters. All original contributions with analytical and/or numerical approaches in the mentioned areas will be considered for publication.

Dr. Mohammad Saud Afzal
Prof. Dr. Trilochan Sahoo
Guest Editors

Manuscript Submission Information

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Keywords

  • scour
  • hydrodynamics
  • Computational Fluid Dynamics (CFD)
  • wave-current interaction
  • wave-structure interaction
  • soft computing
  • mathematical modelling
  • coastal processes
  • hydraulic structures

Published Papers (2 papers)

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Research

25 pages, 14743 KiB  
Article
Numerical Simulations of Scour around Vertical Wall Abutments with Varying Aspect Ratios under Combined Waves and Current Flows
by Lalit Kumar and Mohammad Saud Afzal
J. Mar. Sci. Eng. 2023, 11(10), 1886; https://doi.org/10.3390/jmse11101886 - 28 Sep 2023
Cited by 1 | Viewed by 743
Abstract
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 [...] Read more.
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. Full article
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15 pages, 5063 KiB  
Article
Evolution of Scour Length around Circular Piles Subjected to Irregular Waves Due to Climate Change
by Iván F. Arjona-Catzim, Karina Ocaña-E. de los Monteros, Jaime M. Horta-Rangel, Dora L. Ávila-Arzani, Juan B. Hernández-Zaragoza, Teresa López-Lara and Eduardo Rojas-González
J. Mar. Sci. Eng. 2023, 11(9), 1727; https://doi.org/10.3390/jmse11091727 - 01 Sep 2023
Viewed by 1220
Abstract
Scour is a phenomenon that affects structures deployed in rivers or seas, favoring the transport of sediments around their foundations, which can expose their structural stability. This work aimed to develop a physical model of a mobile bottom to determine the scour-hole extensions [...] Read more.
Scour is a phenomenon that affects structures deployed in rivers or seas, favoring the transport of sediments around their foundations, which can expose their structural stability. This work aimed to develop a physical model of a mobile bottom to determine the scour-hole extensions around a group of four vertical piles of circular sections subjected to irregular waves. For this purpose, a beach profile and a typical slope were constructed and subjected to 24 h of storm waves, divided into 12 h intervals in the prototype. Additionally, three wave periods were studied according to the Mexican Institute of Transportation wave data and three scenarios of a rise in sea level. The data suggest that the length of the scour hole was greater in the piles in the front for all cases, which may be reflected in a reduction in scour protection costs. The results obtained for the extent of the scour hole suggest a setting of less than four times the pile diameter in most cases. Finally, it is inferred that a rise in sea level by itself is not a decisive factor in the increase in the values obtained; therefore, it is necessary to consider the variations in wave heights and wave periods associated with such increases. Full article
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