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Advanced Studies in Marine Geomechanics and Geotechnics
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Advanced Studies in Marine Geomechanics and Geotechnics

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

Deadline for manuscript submissions: closed (30 December 2024) | Viewed by 7910

Special Issue Editor

Dr. Ahmed Benamar

E-Mail Website
Guest Editor
Laboratoire Ondes et Milieux Complexes, University of Le Havre-Normandie, Le Havre, France
Interests: geo-environmental engineering; soil and sediment remediation; mud rheology; soil erosion; application of ultrasonic in geotechnics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The study of marine geomechanics and geotechnics has emerged as a crucial field in our understanding of the complex interactions between water and the sea bed. It involves the investigation of geological, geophysical, and geotechnical processes in marine environments, encompassing seabed sediments, coastal areas, and offshore structures. The field integrates principles from geology, engineering, and environmental science to address challenges associated with marine and coastal exploration, infrastructure development, and environmental management. Key areas of focus in advanced studies include seabed characterization, sediment dynamics, scour erosion, slope stability analysis, foundation design for offshore structures, and risk assessment in marine environments. Advanced imaging techniques and remote sensing have revolutionized our understanding of seabed morphology and sediment distribution. Furthermore, advancements in numerical modeling and simulation techniques have enhanced our ability to predict complex processes such as submarine landslides, sediment transport, and seabed responses to anthropogenic activities. The studies focus on minimizing the environmental impact of dredging operations, assessing the stability of submarine pipelines and cables, and evaluating the geohazards associated with dredged sediments and coastal development.

The purpose of this Special Issue is to publish exciting research related to the above subjects and to provide and disseminate the articles freely for research, teaching, and reference purposes.

Dr. Ahmed Benamar
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • marine environment
  • geotechnics
  • offshore structures
  • sediment dynamics
  • scour erosion

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Published Papers (9 papers)

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Research

24 pages, 3214 KiB  
Article
Effectiveness of Staggered Pile Arrangements for Managing River Mouth Closures on Gravel Beaches
by Yamato Torii, Masami Kiku, Norimi Mizutani and Tomoaki Nakamura
J. Mar. Sci. Eng. 2025, 13(2), 253; https://doi.org/10.3390/jmse13020253 - 29 Jan 2025
Viewed by 384
Abstract
Several small- and medium-sized rivers connecting to the Shichiri-Mihama coast are closed due to debris. The progression of river mouth closures increases the risk of flooding in the watershed, so countermeasures are necessary. In this study, piles were installed in a staggered pattern [...] Read more.
Several small- and medium-sized rivers connecting to the Shichiri-Mihama coast are closed due to debris. The progression of river mouth closures increases the risk of flooding in the watershed, so countermeasures are necessary. In this study, piles were installed in a staggered pattern to prevent river mouth closures. The hydraulic model experiment was conducted to assess how countermeasure (staggered piles) installation affects topographic change under various wave conditions. The installation of the staggered piles was found to be effective in moving the location of the berm forward more than 10 cm offshore and reducing gravel accumulation by up to 57%. The effect of the staggered piles is particularly significant in wave conditions with small wave gradients. The pile row spacing should be short to maintain the complexity of the staggered arrangement. The effects of changes in the flow velocity field and differences in the bottom sediment should also be considered for practical use. Eventually, the installation of the staggered piles will be expected to prevent the long-term development of berms, thus preventing estuary closure. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
13 pages, 7329 KiB  
Article
Comparative Analysis of Floc Measurement Setups for Characterising Settling Velocities and Size Distributions
by Waqas Ali, Alex Kirichek, Andrew J. Manning and Claire Chassagne
J. Mar. Sci. Eng. 2025, 13(2), 212; https://doi.org/10.3390/jmse13020212 - 23 Jan 2025
Viewed by 546
Abstract
Floc size distribution and settling velocities are crucial parameters for characterising cohesive sediments, as they influence how these sediments behave in various environmental settings. The accurate measurement of these properties is essential, with different methods available depending on the scope of the study. [...] Read more.
Floc size distribution and settling velocities are crucial parameters for characterising cohesive sediments, as they influence how these sediments behave in various environmental settings. The accurate measurement of these properties is essential, with different methods available depending on the scope of the study. For long-term monitoring, in situ techniques based on laser diffraction are commonly used, while video microscopy techniques are preferred for shorter studies due to their ability to provide detailed information on individual particles. This study compares two high-magnification digital video camera setups, LabSFLOC-2 and FLOCCAM, to investigate the impact of particle concentration on settling velocity in flocculated sediments. Flocculated clay was introduced into settling columns, where both the size and settling velocities of the flocs were measured. The results obtained from both setups are in line with each other, even though the FLOCCAM was slightly more efficient at capturing images of small particles (of size less than 50 microns) and LabsFLOC-2 was better at detecting large size fraction particles (having a low contrast due to the presence of organic matter). Floc size and settling velocity measurements from both setups however exhibit mostly similar trends as a function of clay concentration and the same order of magnitudes for the recorded settling velocities. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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20 pages, 7868 KiB  
Article
Numerical Simulation of Wave-Induced Scour in Front of Vertical and Inclined Breakwaters
by Xin Liu, Tomoaki Nakamura, Yong-Hwan Cho and Norimi Mizutani
J. Mar. Sci. Eng. 2024, 12(12), 2261; https://doi.org/10.3390/jmse12122261 - 9 Dec 2024
Viewed by 610
Abstract
The erosion of the seabed in front of shoreline structures due to wave action is a critical concern. While previous models accurately depict fluid and sediment interactions, they each have limitations and require significant computational resources, especially when simulating complex processes. This study [...] Read more.
The erosion of the seabed in front of shoreline structures due to wave action is a critical concern. While previous models accurately depict fluid and sediment interactions, they each have limitations and require significant computational resources, especially when simulating complex processes. This study proposed and validated a numerical model for simulating wave-induced sediment transport by integrating three key components: (1) a main solver based on large eddy simulation that includes the porosity of permeable materials, (2) a volume of fluid module to track the air–water surface, and (3) a sediment transport module that includes both bedload and suspended load to compute sediment concentrations and seabed changes. The model was validated against previously published experimental data, demonstrating its accuracy in capturing both wave motion and seabed profile changes induced by sediment transport. Furthermore, the numerical model was applied to study the effects of varying breakwater slopes on sediment seabed profile changes. The results show that steeper breaker slopes led to more concentrated wave energy near the structure, resulting in deeper scouring and higher sediment displacement. These results indicate that the proposed model is a valuable tool for coastal engineering applications, particularly for designing breakwaters, to mitigate sediment erosion and improve sediment stability. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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23 pages, 11538 KiB  
Article
Three-Dimensional Numerical Modeling of Local Scour Around Bridge Foundations Based on an Improved Wall Shear Stress Model
by Peng Yu, Sheng Xu, Jiuchao Chen, Lingke Zhu, Jiale Zhou, Lie Yu and Zewen Sun
J. Mar. Sci. Eng. 2024, 12(12), 2187; https://doi.org/10.3390/jmse12122187 - 29 Nov 2024
Viewed by 595
Abstract
Currently, there are two primary issues with CFD simulations of local scour around bridge foundations using the RANS method. Firstly, the self-sustaining characteristics of turbulent boundary conditions at the inlet require special attention. Secondly, the simulated location of the maximum scour depth does [...] Read more.
Currently, there are two primary issues with CFD simulations of local scour around bridge foundations using the RANS method. Firstly, the self-sustaining characteristics of turbulent boundary conditions at the inlet require special attention. Secondly, the simulated location of the maximum scour depth does not align with experimental observations. This paper employs the RANS method to model the hydrodynamic characteristics surrounding bridge piers. The sediment transport model and sediment-sliding model, considering any slope of the riverbed, were adopted to simulate the spatiotemporal evolution of local scour around the bridge foundation. Building on traditional methods and assuming local turbulence equilibrium, a self-sustaining model is theoretically derived. This model swiftly develops a balanced turbulent boundary layer, achieving a horizontally uniform flow field and effectively maintaining consistency between the inlet-given turbulent profile and physical reality. Additionally, by incorporating the velocity component of the downward-flow in front of the pier and the average shear stress around the pier into the excess shear stress model, the refined wall shear stress model accurately estimates the scouring contributions of the downward-flow and the horseshoe vortex system in this region. The numerical results including the maximum scour depth, location, and scour pit shape are consistent with experimental findings. The findings demonstrate that the numerical approach proposed in this study effectively addresses the issue of inadequate estimation of turbulent characteristics in scour pit at the leading edge of bridge piers using the RANS method. This method offers novel insights and approaches for addressing local scour issues in bridges and offshore wind turbines, as well as vortex-induced vibration issues in submarine pipelines. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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14 pages, 11579 KiB  
Article
Role of Organic Matter Present in the Water Column on Turbidity Flows
by Shaheen Akhtar Wahab, Waqas Ali, Claire Chassagne and Rudy Helmons
J. Mar. Sci. Eng. 2024, 12(10), 1884; https://doi.org/10.3390/jmse12101884 - 21 Oct 2024
Viewed by 968
Abstract
Turbidity flows are known to be affected by the density difference between sediment plumes and the surrounding water. However, besides density, other factors could lead to changes in flow propagation. Such a factor is the presence of suspended organic matter. Recently, it was [...] Read more.
Turbidity flows are known to be affected by the density difference between sediment plumes and the surrounding water. However, besides density, other factors could lead to changes in flow propagation. Such a factor is the presence of suspended organic matter. Recently, it was found that flocculation does occur within plumes upon release of a sediment/organic matter mixture in a lock exchange flume. In the present study, mineral sediment (illite clay) was released into the outflow compartment containing water and synthetic organic matter (polyacrylamide flocculant). Even though the density of water was barely affected by the presence of flocculant, flow head velocity was observed to be larger in the presence of flocculant than without. Samples taken at different positions in the flume indicated that flocs were created during the small current propagation time (about 30–60 s) and that their sizes were larger with higher flocculant dosage. The size of flocs depended on their positions in the flow: flocs sampled in the body part of the flow were larger than the ones sampled at the bottom. All these properties are discussed as a function of sediment–flocculant interactions. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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21 pages, 2540 KiB  
Article
Novel 3D Structural-Light Scanner Technique for Continuous Monitoring of Pier Scour in Laboratory
by Jana Zaidan, Adrien Poupardin, Abdelkrim Bennabi, François Marin and Ahmed Benamar
J. Mar. Sci. Eng. 2024, 12(9), 1566; https://doi.org/10.3390/jmse12091566 - 6 Sep 2024
Viewed by 840
Abstract
Laboratory experiments are crucial for understanding scour around embedded structures. However, there is currently no standard and reliable instrumentation for monitoring the progression of this physical process in laboratory. In this paper, the capability of a novel 3D structural-light scanner technique to continuously [...] Read more.
Laboratory experiments are crucial for understanding scour around embedded structures. However, there is currently no standard and reliable instrumentation for monitoring the progression of this physical process in laboratory. In this paper, the capability of a novel 3D structural-light scanner technique to continuously measure the scour bed topography in uninterrupted flow is demonstrated. A suitable data processing procedure is developed to operate this device. Data processing is faster compared to other methods due to the automatic cloud reconstruction. This technique is rapid and allows for data acquisition with high vertical spatial accuracy. Flume tests are conducted on a circular pier founded in sand in clear water, as benchmark tests, to validate the effectiveness of this technique. The results observed with the scanner were coherent with those reported in the literature. Local scour initiation occurred near the sides of the pier. The maximum final scour depth measured was nearly equal to the pier diameter. This technique is considered non-intrusive under the tested hydraulic conditions and presents few limitations compared to other devices. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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18 pages, 12207 KiB  
Article
Numerical Investigation on the Interaction between a Tsunami-like Solitary Wave and a Monopile on a Sloping Sandy Seabed
by Wenbo Xie, Qi Zhang, Hao Cai and Miao Fu
J. Mar. Sci. Eng. 2024, 12(8), 1421; https://doi.org/10.3390/jmse12081421 - 17 Aug 2024
Viewed by 860
Abstract
An integrated numerical model was developed to investigate the interaction between a tsunami-like solitary wave and a monopile on a sloping sandy seabed in this study. The solitary wave motion is governed by the RANS equations with the k-ε turbulence model. [...] Read more.
An integrated numerical model was developed to investigate the interaction between a tsunami-like solitary wave and a monopile on a sloping sandy seabed in this study. The solitary wave motion is governed by the RANS equations with the k-ε turbulence model. The porous sloping sandy seabed is governed by Biot’s equation (u-p approximation). The solitary wave is validated with previous experimental data. Meanwhile, a further comparison of solitary wave scattering by the monopile is carried out to verify the numerical model. Then, the effects of different monopile locations were examined in investigating the solitary wave–monopile interaction problem. The velocity magnitudes and the free-surface elevation changes in the solitary wave around the monopile are investigated at various monopile locations. In addition, the response of the sloping sandy seabed and monopile under the solitary wave are examined. The numerical results demonstrate the accuracy of the current method in simulating solitary waves and wave height variation around monopiles. Wave run-up is observed in front of the monopile, with a high-velocity forward-moving water jet forming behind it. The maximum fluid velocity, wave run-up height in front of the monopile, excess pore water pressure (EPWP), and bending moment of the monopile increase as the monopile approaches the shoreline. However, at the closest location to the shoreline, due to the strong dynamic interaction between the solitary wave and the monopile, significant wave shoaling and breaking are observed, resulting in a slight decrease in the wave force acting on the monopile. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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27 pages, 17626 KiB  
Article
A Decoupled Buckling Failure Analysis of Buried Steel Pipeline Subjected to the Strike-Slip Fault
by Mozhgan Asgarihajifirouz, Xiaoyu Dong and Hodjat Shiri
J. Mar. Sci. Eng. 2024, 12(8), 1243; https://doi.org/10.3390/jmse12081243 - 23 Jul 2024
Viewed by 743
Abstract
Over the past few years, there has been an increased focus on offshore pipeline safety due to the development of offshore oil and gas resources. Both onshore and offshore pipelines may face significant geological hazards resulting from active faults. Pre-excavated soil can be [...] Read more.
Over the past few years, there has been an increased focus on offshore pipeline safety due to the development of offshore oil and gas resources. Both onshore and offshore pipelines may face significant geological hazards resulting from active faults. Pre-excavated soil can be used as backfill for trenches to prevent major pipeline deformations. Since these backfill materials have been heavily remolded, they are softer than the native soil. Therefore, the difference in shear strength between the backfill and native ground may have an effect on the interaction between the pipeline and the backfill. In this paper, the pipeline–backfill–trench interaction is investigated using a hybrid beam–spring model. The P-Y curves obtained from CEL analysis are incorporated into a 3D beam–spring model to analyze the pipeline’s response to lateral strike-slip faults. Additionally, the nonlinearity of pipeline materials is considered to study pipeline failure modes under strike-slip fault movements. A series of parametric studies were conducted to explore the effects of fault intersection angle, pipe diameter, buried depth of the pipe, and soil conditions on the failure modes of buckling pipelines. The developed method can be used to analyze and assess pipeline–backfill–trench interaction when subjected to strike-slip fault displacements. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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20 pages, 5839 KiB  
Article
A Methodology to Evaluate the Real-Time Stability of Submarine Slopes under Rapid Sedimentation
by Zehao Wang, Defeng Zheng, Zhongde Gu, Xingsen Guo and Tingkai Nian
J. Mar. Sci. Eng. 2024, 12(5), 823; https://doi.org/10.3390/jmse12050823 - 14 May 2024
Cited by 3 | Viewed by 1352
Abstract
Rapid sedimentation is widely recognized as a crucial factor in initiating the instability of submarine slopes. Once the slope fails, the subsequent landslide poses a significant threat to the safety of underwater infrastructures and potentially leads to severe damage to seabed pipelines, offshore [...] Read more.
Rapid sedimentation is widely recognized as a crucial factor in initiating the instability of submarine slopes. Once the slope fails, the subsequent landslide poses a significant threat to the safety of underwater infrastructures and potentially leads to severe damage to seabed pipelines, offshore foundations, and oil and gas exploitation wells. However, there is currently a lack of numerical methods to effectively assess the real-time stability of submarine slopes under rapid sedimentation. This study firstly employs a calibrated finite element (FE) model-change approach to reproduce the rapid sedimentation processes and proposes a concise method to calculate the safety factors for the real-time stability of sedimenting submarine slopes. Further, a parametric analysis is carried out to evaluate the effect of varying sedimentation rates on slope stability, and the critical sedimentation rate is numerically solved. Moreover, the effect of seismic events with different occurring times on the stability of rapidly sedimenting slopes is investigated in depth, and the most critical seismic loading pattern among various acceleration combinations is achieved. The results indicate that the presence of weak layers during sedimentation is a critical factor contributing to slope instability. The introduced rate of decrease in the safety factor proves valuable in assessing slope safety over a specific period. As the occurrence time of seismic events is delayed, the seismic resistance of the slope decreases, increasing the likelihood of shallower sliding surfaces. The findings offer insights into the mechanisms by which rapid sedimentation influences the stability of submarine slopes and provide valuable insights for predicting the potential instability of rapidly sedimenting slopes under specific seismic activity levels. Full article
(This article belongs to the Special Issue Advanced Studies in Marine Geomechanics and Geotechnics)
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