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JMSE
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Waves and Ocean Structures II
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Waves and Ocean Structures II

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

Deadline for manuscript submissions: closed (1 April 2022) | Viewed by 13312

Special Issue Editors

Prof. Dr. Jaw-Fang Lee

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Guest Editor
Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan City 701, Taiwan
Interests: interaction of waves and floating structures; interaction of waves and porous structures; interaction of waves and submerged structures; waves on poro-elastic seabeds; wavemaking theory
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ruey-Syan Shih

E-Mail Website
Guest Editor
Department of Harbor & River Engineering, National Taiwan Ocean University, Keelung, Taiwan
Interests: wave attenuation structure; numerical wave flume and wave flow field simulation; PIV technique on wave–structure interactions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In this 2nd-year of the Special Issue we continue to collect contemporary papers with topics including, but not limited to, interactions between waves and ocean structures. The wave theory can include effects from ocean structures. Various ocean structures can be included, such as fixed, movable, porous, flexible, free-floating, or with moorings. We are particularly interested in coupling between waves and structures emphasizing effects on wave fields or motions of the structure. As for the research methodology, it can be analytical, numerical, or in situ data analysis. New findings are especially welcome. With the increasing development of natural energy such as solar, current, or wave energy, new types of ocean structures interacting with ocean waves could also be interesting topics. We encourage you to continue contributing to this Special Issue, and helping this Issue successful.

Prof. Dr. Jaw-Fang Lee
Prof. Dr. Ruey-Syan Shih
Guest Editors

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

  • waves
  • ocean structures
  • fixed
  • movable
  • free floating
  • mooring

Published Papers (5 papers)

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Research

15 pages, 2890 KiB  
Article
An Analytical Solution of Transient Wave Generation in the Wave Channel
by Cheng-Tsung Chen, Jaw-Fang Lee, Kuei-Ting Lin and Pi-Sheng Hu
J. Mar. Sci. Eng. 2022, 10(9), 1198; https://0-doi-org.brum.beds.ac.uk/10.3390/jmse10091198 - 26 Aug 2022
Viewed by 1447
Abstract
Transient characteristics of wave generation in the wave channel can provide unique and important information in contrast to the steady and periodic motion of propagation waves. In this paper, a new analytical solution is proposed for a transient wavemaker problem in the wave [...] Read more.
Transient characteristics of wave generation in the wave channel can provide unique and important information in contrast to the steady and periodic motion of propagation waves. In this paper, a new analytical solution is proposed for a transient wavemaker problem in the wave channel. The mathematical model of the wavemaker problem is established based on the linear potential wave theory, and a new analytical solution for the corresponding initial and boundary-value problem is presented. The present solution methodology is motivated and developed from old methods shown in literature. The present solution can be mathematically reformulated and shown to be identical to the previous solution using different solution methodology. The present analytical solution is further compared with numerical results and experiments to validate the mathematical model. The present solution is used to calculate the steady state generated wave forms that compare very well with the steady wave theory both in wave length and wave period. The present solution is also used to study unsteady characteristics of wave heights and wave lengths of the leading waves. The present analytical solution methodology can provide an easier approach to obtain the analytical solution for transient wave generation problem in the wave channel. Full article
(This article belongs to the Special Issue Waves and Ocean Structures II)
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12 pages, 2517 KiB  
Article
A Time-Domain Analytic Solution of Flow-Induced Undular Bores
by Cheng-Tsung Chen, Jaw-Fang Lee, Hubert Chanson, Kuei-Ting Lin and Chun-Jih Lin
J. Mar. Sci. Eng. 2022, 10(6), 738; https://0-doi-org.brum.beds.ac.uk/10.3390/jmse10060738 - 27 May 2022
Cited by 2 | Viewed by 1605
Abstract
In this study, the problem of surface waves induced by water flow in a flow channel was investigated. The mathematical model based on the potential wave theory was established, and a new analytic solution to the corresponding initial and boundary value problem was [...] Read more.
In this study, the problem of surface waves induced by water flow in a flow channel was investigated. The mathematical model based on the potential wave theory was established, and a new analytic solution to the corresponding initial and boundary value problem was proposed. To confirm our analytic solution, the mathematical model was applied to simulate experiments conducted in a flow channel in the laboratory. Using our analytic solution, water surface elevations and flow velocities at certain locations in the channel were compared with experimental results. Comparisons between our analytic solution and experimental results confirmed our theory that amplitudes and propagating phases are in very close agreement. Our analytic solution can be used to calculate variations in pressure and velocity along the water depth, which are expensive to calibrate and obtain in experiments. Although our analytic solution was established based on linear theory, it is very practical for applications studying the basic properties of surface elevation, velocity, and pressure of the flow field induced by water current both in space and time. Full article
(This article belongs to the Special Issue Waves and Ocean Structures II)
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48 pages, 8326 KiB  
Article
Investigation on Hydrodynamic Characteristics, Wave–Current Interaction and Sensitivity Analysis of Submarine Hoses Attached to a CALM Buoy
by Chiemela Victor Amaechi, Facheng Wang and Jianqiao Ye
J. Mar. Sci. Eng. 2022, 10(1), 120; https://0-doi-org.brum.beds.ac.uk/10.3390/jmse10010120 - 17 Jan 2022
Cited by 15 | Viewed by 3572
Abstract
There is an increase in the utilization of the floating offshore structure (FOS) called Catenary Anchor Leg Mooring (CALM) buoys and the attached marine hoses due to the increasing demand for oil and gas products. These hoses are flexible and easier to use [...] Read more.
There is an increase in the utilization of the floating offshore structure (FOS) called Catenary Anchor Leg Mooring (CALM) buoys and the attached marine hoses due to the increasing demand for oil and gas products. These hoses are flexible and easier to use but have a short service life of about 25 years. They are adaptable in ocean locations of shallow, intermediate and deep waters. In this research, a numerical model was developed using a coupling method modeled by utilizing ANSYS AQWA and Orcaflex (Orcina Ltd., Ulverston, UK) dynamic models of the CALM buoy hoses. Two cases were comparatively studied: Lazy-S and Chinese-lantern configurations, under ocean waves and current. Comparisons were also made between coupled and uncoupled models. This research presents the hydrodynamic characteristics with a sensitivity analysis on the influence of waves, current attack angle, soil gradient, soil stiffness and environmental conditions that influence the performance of marine hoses. The study comparatively looked at the configurations from dynamic amplification factors (DAF) on marine hoses. The results show that marine hoses can be easily configured to suit the designer’s need, seabed soil type, seabed topography and the profiles that are useful for manufacturers. The sensitivity analysis also shows the effect of hose parameters on its hydrodynamic behavior from the wave–current interaction (WCI). Full article
(This article belongs to the Special Issue Waves and Ocean Structures II)
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18 pages, 6023 KiB  
Article
The Effect of Wave-Induced Current and Coastal Structure on Sediment Transport at the Zengwen River Mouth
by Chun-Hung Pao, Jia-Lin Chen, Shih-Feng Su, Yu-Ching Huang, Wen-Hsin Huang and Chien-Hung Kuo
J. Mar. Sci. Eng. 2021, 9(3), 333; https://0-doi-org.brum.beds.ac.uk/10.3390/jmse9030333 - 17 Mar 2021
Cited by 5 | Viewed by 3307
Abstract
The mechanisms that control estuarine sediment transport are complicated due to the interaction between riverine flows, tidal currents, waves, and wave-driven currents. In the past decade, severe seabed erosion and shoreline retreat along the sandy coast of western Taiwan have raised concerns regarding [...] Read more.
The mechanisms that control estuarine sediment transport are complicated due to the interaction between riverine flows, tidal currents, waves, and wave-driven currents. In the past decade, severe seabed erosion and shoreline retreat along the sandy coast of western Taiwan have raised concerns regarding the sustainability of coastal structures. In this study, ADCPs (Acoustic Doppler Current Profiler) and turbidity meters were deployed at the mouth of the Zengwen river to obtain the time series and the spatial distribution of flow velocities and turbidity during the base flow and flood conditions. A nearshore circulation model, SHORECIRC, has been adapted into a hybrid finite-difference/finite-volume, TVD (Total Variation Diminishing)-type scheme and coupled with the wave-spectrum model Simulating Waves Nearshore (SWAN). Conventional finite-difference schemes often produce unphysical oscillations when modeling coastal processes with abrupt bathymetric changes at river mouths. In contrast, the TVD-type finite volume scheme allows for robust treatment of discontinuities through the shock-capturing mechanism. The model reproduces water levels, waves, currents observed at the mouth of the Zengwen River reasonably well. The simulated residual sediment transport patterns demonstrate that the transport process at the river mouth is dominated by the interaction of the bathymetry and wave-induced currents when the riverine discharge was kept in reservoirs. The offshore residual transport causes erosion at the northern part of the river mouth, and the onshore residual transport causes accretion in the ebb tidal shoals around the center of the river mouth. The simulated morphological evolution displays significant changes on shallower deltas. The location with significant sea bed changes is consistent with the spot in which severe erosion occurred in recent years. Further analysis of morphological evolution is also discussed to identify the role of coastal structures, for example, the extension of the newly constructed groins near the river mouth. Full article
(This article belongs to the Special Issue Waves and Ocean Structures II)
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23 pages, 3602 KiB  
Article
Optimal Actuator Placement for Real-Time Hybrid Model Testing Using Cable-Driven Parallel Robots
by Einar Ueland, Thomas Sauder and Roger Skjetne
J. Mar. Sci. Eng. 2021, 9(2), 191; https://0-doi-org.brum.beds.ac.uk/10.3390/jmse9020191 - 12 Feb 2021
Cited by 2 | Viewed by 1899
Abstract
In real-time hybrid model testing, complex ocean structures are emulated by fusing numerical modelling with traditional hydrodynamic model testing. This is done by partitioning the ocean structure under consideration into a numerical and a physical substructure, coupled in real time via a measurement [...] Read more.
In real-time hybrid model testing, complex ocean structures are emulated by fusing numerical modelling with traditional hydrodynamic model testing. This is done by partitioning the ocean structure under consideration into a numerical and a physical substructure, coupled in real time via a measurement and control interface. The numerically computed load vector is applied to the physical substructure by means of multiple actuated winches so that the resulting experimental platform becomes a type of cable-driven parallel robot. In this context, the placement of the actuated winches is important to ensure that the loads can be accurately and robustly transferred to the physical substructure. This paper addresses this problem by proposing a performance measure and an associated actuator placement procedure that enables accurate force tracking and ensures that the numerically calculated loads can be actuated throughout the testing campaign. To clarify the application of the proposed procedure, it is applied to the design of a test setup for a moored barge. Overall, the paper represents a guideline for robust and beneficial actuator placement for real-time hybrid model testing using cable-driven parallel robots for load-actuation. Full article
(This article belongs to the Special Issue Waves and Ocean Structures II)
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