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Scour around Offshore Structures: Process, Evolution and Protection
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Scour around Offshore Structures: Process, Evolution and Protection

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Oceans and Coastal Zones".

Deadline for manuscript submissions: closed (20 February 2024) | Viewed by 4672

Special Issue Editors

Prof. Dr. Xuguang Chen

E-Mail Website
Guest Editor
College of Engineering, Ocean University of China, Qingdao 266000, China
Interests: scour mechanism; scour protection; scour monitoring; offshore wind power foundation; subsea pipeline; offshore structures
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Fayun Liang

E-Mail Website
Guest Editor
Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
Interests: offshore pile foundation; geotechnical earthquake engineering; soft soil engineering; deep-water foundation; scour and erosion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The scour of sediments around offshore structures by wave currents is the most important factor contributing to their failure. The scour of offshore structures leads to human fatalities and economic losses every year. Most of the research on scour mechanisms has been carried out on current and sediment environments. However, seabed soil is constantly liquefied and re-consolidated in complex marine environments, resulting in continuous changes in the properties of seabed soil. There are fewer studies involving the properties of seabed soil. Moreover, traditional scour protection measures mostly exist along the river pile scour protection measures, which have various shortcomings and cannot be effective in the long term in complex hydrodynamic and soil environments. Therefore, revealing the scouring mechanism under the coupling of the seabed soil, sediment, and wave–current are crucial for the design and protection of offshore structures.

In this Special Issue, we invite submissions on scour mechanisms and scour protection methods for offshore hydraulic structures in order to solve the this problem under the complex fluid–structure–soil interaction and develop effective scour protection methods. This Special Issue will cover research on scour macroscopic mechanisms, scour protection methods, scour model tests, and numerical simulations of scour for offshore structures. New findings, methods, tools, and improved models for other studies of water–soil systems are welcome.

Prof. Dr. Xuguang Chen
Prof. Dr. Fayun Liang
Guest Editors

Manuscript Submission Information

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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. Water is an international peer-reviewed open access semimonthly 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

  • scour mechanism
  • scour protection
  • scour test
  • offshore wind power
  • offshore structures
  • subsea pipeline
  • fluid–structure–soil coupling

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Published Papers (3 papers)

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Research

19 pages, 6871 KiB  
Article
Scour Effect on the Lateral Bearing Behaviour of Monopiles Considering Different Slenderness Ratios
by Qiang Li, Xinquan Wang, Kenneth Gavin, Shengxiang Jiang, Hongguo Diao, Mingyuan Wang and Kangyu Wang
Water 2024, 16(2), 226; https://doi.org/10.3390/w16020226 - 9 Jan 2024
Cited by 2 | Viewed by 1300
Abstract
Scour leads to the loss of soil around monopile foundations for offshore wind turbines, which affects their structural safety. In this paper, the effect of scour on the lateral behaviour of monopiles was extensively investigated using finite element analysis, and calibration and comparison [...] Read more.
Scour leads to the loss of soil around monopile foundations for offshore wind turbines, which affects their structural safety. In this paper, the effect of scour on the lateral behaviour of monopiles was extensively investigated using finite element analysis, and calibration and comparison were undertaken using centrifuge tests. Piles with three slenderness ratios, i.e., 3, 5 and 8, were studied by keeping the diameter constant and varying the embedment length. Three scour types (local narrow, local wide and global) and four scour depths (0.5D, 1D, 1.5D and 2D; D signifies the pile diameter) were considered in this investigation. The results indicate that the lateral resistance of the pile is the greatest in the case of local narrow scour, followed by that in the cases of local wide scour and global scour. When the scour depth is larger than 1D, the influence of the scour type on the pile lateral bearing behaviour is insignificant. The influence of the scour type and scour depth on the pile lateral bearing behaviour is broadly similar for piles with slenderness ratios of 3, 5 and 8. However, the piles featured with smaller embedment lengths show a larger decrease rate in their lateral capacity, which means the effect of scour should cause more concern on small slenderness ratio monopiles. Full article
(This article belongs to the Special Issue Scour around Offshore Structures: Process, Evolution and Protection)
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17 pages, 7527 KiB  
Article
Influence of Scour Protection on the Vertical Bearing Behaviour of Monopiles in Sand
by Qiang Li, Xinquan Wang, Kenneth Gavin, Shengxiang Jiang, Hongguo Diao and Kangyu Wang
Water 2024, 16(2), 215; https://doi.org/10.3390/w16020215 - 7 Jan 2024
Cited by 2 | Viewed by 1654
Abstract
Extensive studies have been performed on the effectiveness of scour protection against scour erosion progression. But there is little research to date evaluating the effect of scour protection on vertical resistance behaviour of monopile foundations. This paper investigates the influence of scour protection [...] Read more.
Extensive studies have been performed on the effectiveness of scour protection against scour erosion progression. But there is little research to date evaluating the effect of scour protection on vertical resistance behaviour of monopile foundations. This paper investigates the influence of scour protection on the vertical loading behaviour of monopiles installed in sand using centrifuge tests and finite element analysis (FEA). Four scour protection widths (1D, 2D, 3D, 4D; where D is the pile diameter) and three scour protection thicknesses (1 m, 2 m, 3 m) were modelled on a pile with a slenderness ratio (L/D) of five. In the FEA, the scour protection mechanism was modelled using two strategies, namely the ‘stress method’ by applying stress and the ‘material method’ by applying virtual material on the seabed surface around the pile. Outcomes between these two strategies were compared, and the contact coefficient δ used in the ‘material method’ for describing the contact effectiveness of the overlaying scour protection material with the pile structure was introduced, providing a more scientific and accurate calculation reference for engineering applications. The results indicated that the vertical capacity of monopiles could be increased by 5% to 23% by adopting the scour protection measure, depending on the scour protection width and scour protection thickness. Full article
(This article belongs to the Special Issue Scour around Offshore Structures: Process, Evolution and Protection)
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22 pages, 5894 KiB  
Article
Application and Experiment of the Theory of Headland–Bay Equilibrium Coast in the Design of Artificial Beach Shoreline
by Longzai Ge, Hanbao Chen, Songgui Chen and Yingni Luan
Water 2023, 15(23), 4068; https://doi.org/10.3390/w15234068 - 23 Nov 2023
Viewed by 1239
Abstract
Coastal scientists and engineers are constantly trying to quantify the ideal bay shape using mathematical formulas. Since the 1980s, a large number of achievements have been accomplished and various empirical models have been obtained. This article is based on the theory of equilibrium [...] Read more.
Coastal scientists and engineers are constantly trying to quantify the ideal bay shape using mathematical formulas. Since the 1980s, a large number of achievements have been accomplished and various empirical models have been obtained. This article is based on the theory of equilibrium coastal development in the headland–bay and takes an artificial beach forming part of Rizhao Port’s “Return to Sea” project in Northern China as an example to explore the selection of beach protection schemes. The influence of different forms of plan layout on the shape of the equilibrium shoreline is compared, and the scheme is further validated using physical model testing methods. The following results are obtained: (1) a suitable protection scheme and its corresponding beach equilibrium shoreline shape are recommended, (2) a reasonable maintenance cycle is proposed, and (3) after 27 months of implementation of the artificial beach, the monitored sediment loss is less than 10% of the total amount, meeting the design purpose. This confirms the effectiveness of the research results in artificial beach protection engineering and equilibrium shoreline design, achieving good economic, social, and ecological environmental benefits, and with broad prospects for promotion and application. The results can also provide reference and guidance for subsequent coastal engineering evaluation, improvement, and construction. Full article
(This article belongs to the Special Issue Scour around Offshore Structures: Process, Evolution and Protection)
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