Structure–Seabed Interactions in Marine Environments

Guo, Zhen; Jeng, Dong‐Sheng

doi:10.3390/jmse9090972

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…1 . Typically, the sea/ocean floor in coastal waters is covered with sediments resulting from the decomposition of organic matter and particles of inorganic matter deposited by rivers, or even volcanic ash fall 36 . Depending on sea currents, this layer of sediments can vary in thickness, and in addition, depending on the dominant material, it can have different electrical conductivity, which is strongly related to the distribution of the electric field generated by the ship.…”

Section: Introductionmentioning

confidence: 99%

An analytical four-layer horizontal electric current dipole model for analysing underwater electric potential in shallow seawater

Wołoszyn

Buszman

Rutkowski

et al. 2022

Sci Rep

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The paper presents a new analytical four-layer (air–water–bottom–non-conductive layer) horizontal electric dipole model which allows an accurate approximation of ship's Underwater Electric Potential (UEP) from a sufficient depth in shallow coastal marine waters. The numerical methods, usually Finite Element Method (FEM) or Boundary Elements Method (BEM), are typically used to estimate the electric field and the distribution of static electric components of UEP around the ship. These methods enable analyses with high accuracy but, compared to other point-electrode methods and the proposed analytical model, they are relatively complex and need high computational time. The developed analytical model proposed in this paper allows real-time calculations without significant loss of accuracy of the UEP estimations. In the model, the problem of boundary values at the borders of individual layers is solved using the reflection/image method and applying the idea of continuity of electric potential at a given boundary between two adjacent layers. Its accuracy is verified based on the synthetic data provided by specialised software packages making use of FEM and BEM numerical methods. A dimensionless quantitative analysis of the relationships between basic parameters of the proposed four-layer analytical model and their impact on the accuracy of representation of individual electric field strength components is also delivered. The relationships between water and bottom conductivity and between water depth and bottom thickness are investigated and described. The obtained results show that the developed model allows detailed and reliable analysis of the electric field, especially in shallow coastal waters.

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Section: Introductionmentioning

confidence: 99%

An analytical four-layer horizontal electric current dipole model for analysing underwater electric potential in shallow seawater

Wołoszyn

Buszman

Rutkowski

et al. 2022

Sci Rep

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“…The features that displayed the greatest degree of inter class variation were used to reconcile the k-means classification to the environment from which they were derived. the density of the features as points for each class over a defined pixel neighbourhood (75 m) with density being displayed as number of class point features per km 2 . Geometrical features available in eCognition were derived from the image objects and were the principal component to the classification, all features used in the k-means classification are outlined in Table 2.…”

Section: K-means Classificationmentioning

confidence: 99%

“…Likewise, structures may also become buried over time. Interpreting benthic current speeds from bedform morphologies also enables appropriate infrastructure design and assists sediment transport modelling important for coastal erosion management or to predict recovery from marine aggregate extraction [2][3][4]. Cold-water corals 2 of 26 (CWCs) are sessile organisms that can generate complex three-dimensional frameworks that form reefs and coral mounds over time by the accumulation of biological remains including coral rubble and the trapping of sediments [5,6].…”

Section: Introductionmentioning

confidence: 99%

A Characterisation of Benthic Currents from Seabed Bathymetry: An Object-Based Image Analysis of Cold-Water Coral Mounds

Summers

Wheeler

2022

Remote Sensing

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Seabed sedimentary bedforms (SSBs) are strong indicators of current flow (direction and velocity) and can be mapped in high resolution using multibeam echosounders. Many approaches have been designed to automate the classification of such SSBs imaged in multibeam echosounder data. However, these classification systems only apply a geomorphological contextualisation to the data without making direct assertions on the velocities of benthic currents that form these SSBs. Here, we apply an object-based image analysis (OBIA) workflow to derive a geomorphological classification of SSBs in the Moira Mounds area of the Belgica Mound Province, NE Atlantic through k-means clustering. Cold-water coral reefs as sessile filter-feeders benefit from strong currents are often found in close association with sediment wave fields. This OBIA provided the framework to derive SSB wavelength and wave height, these SSB attributes were used as predictor variables for a multiple linear regression to estimate current velocities. Results show a bimodal distribution of current flow directions and current speed. Furthermore, a 5 k-means classification of the SSB geomorphology exhibited an imprinting of current flow consistency which altered throughout the study site due to the interaction of regional, local, and micro scale topographic steering forces. This study is proof-of-concept for an assessment tool applied to vulnerable marine ecosystems but has wider applications for applied seabed appraisals and can inform management and monitoring practice across a variety of spatial and temporal scales. Deriving spatial patterns of hydrodynamic processes from widely available multibeam echosounder maps is pertinent to many avenues of research including scour predictions for offshore structures such as wind turbines, sediment transport modelling, benthic fisheries, e.g., scallops, cable route and pipeline risk assessment and habitat mapping.

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“…Recently, with the processive development of new directions and demands in geotechnical engineering, especially marine geotechnical engineering, many international research institutions (e.g., University of British Columbia, Georgia Institute of Technology, Delft University, and Southeast University) and professional in situ test instrument development companies (e.g., Hogentogler, Vertek, ConeTec, and Furgo Corporation) have developed new sensors for CPTU. These new CPTU sensors promote the CPTU test method to develop in the direction of multi-functionality [10,[19][20][21][22][23][24], which further broadens the application field of the CPTU. Figure 1 shows a schematic diagram of the internal structure of a common CPTU.…”

Section: Introductionmentioning

confidence: 99%

“…The design and construction of marine engineering, including the main structure and appurtenant facilities such as submarine cables and pipelines, require a large amount of survey-accurate data [9,10]. Soft soils with a high water content, large porosity, low shear strength, high sensitivity, and low surface strength are common conditions encountered in marine engineering projects [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Practice and Development of T-Bar Penetrometer Tests in Offshore Engineering Investigation: A Comprehensive Review

Qiao

Liu

et al. 2023

JMSE

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In recent years, the development of marine hydrocarbon resources has led to an increased demand for research on the marine soil bearing capacity and cyclic loading effect in marine engineering design. Because of the difficulties and high costs involved in obtaining high-quality soil samples from offshore sites, in situ testing techniques have become the preferred method of determining design parameters in offshore geotechnical engineering projects. This paper provides a review of the current state of marine penetrometer deployment technology used in offshore engineering investigations and presents a summary of the T-bar penetrometer test for measuring marine soft clay. The existing literature research on penetration mechanisms, numerical simulations, laboratory experiments, and field tests of the T-bar penetrometer in the field of marine geotechnical engineering are analyzed. Finally, the potential difficulties, challenges, and prospects of the T-bar penetrometer tests are discussed.

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Structure–Seabed Interactions in Marine Environments

Abstract: The phenomenon of soil–structure interactions in marine environments has attracted much attention from coastal and geotechnical engineers and researchers in recent years [...]

Cited by 4 publications

References 9 publications

An analytical four-layer horizontal electric current dipole model for analysing underwater electric potential in shallow seawater

An analytical four-layer horizontal electric current dipole model for analysing underwater electric potential in shallow seawater

A Characterisation of Benthic Currents from Seabed Bathymetry: An Object-Based Image Analysis of Cold-Water Coral Mounds

The Practice and Development of T-Bar Penetrometer Tests in Offshore Engineering Investigation: A Comprehensive Review

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