Journal Description
Journal of Marine Science and Engineering
Journal of Marine Science and Engineering
is an international, peer-reviewed, open access journal on marine science and engineering, published monthly online by MDPI. The Australia New Zealand Marine Biotechnology Society (ANZMBS) is affiliated with JMSE and their members receive discounts on the article processing charges.
- Open Access— free for readers, with article processing charges (APC) paid by authors or their institutions.
- High Visibility: indexed with Scopus, SCIE (Web of Science), GeoRef, Inspec, AGRIS, and other databases.
- Journal Rank: JCR - Q1 (Engineering, Marine) / CiteScore - Q2 (Civil and Structural Engineering)
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 16.9 days after submission; acceptance to publication is undertaken in 2.6 days (median values for papers published in this journal in the first half of 2024).
- Recognition of Reviewers: reviewers who provide timely, thorough peer-review reports receive vouchers entitling them to a discount on the APC of their next publication in any MDPI journal, in appreciation of the work done.
Impact Factor:
2.7 (2023);
5-Year Impact Factor:
2.8 (2023)
Latest Articles
Assessment of Hull and Propeller Performance Degradation Based on TSO-GA-LSTM
J. Mar. Sci. Eng. 2024, 12(8), 1263; https://doi.org/10.3390/jmse12081263 (registering DOI) - 26 Jul 2024
Abstract
Evaluating the degradation of hull and ship performance and exploring their degradation pathways is crucial for developing scientific and reasonable ship maintenance plans. This paper proposes a two-stage optimization (TSO) algorithm that combines the Genetic Algorithm (GA) and Long Short-Term Memory (LSTM) network,
[...] Read more.
Evaluating the degradation of hull and ship performance and exploring their degradation pathways is crucial for developing scientific and reasonable ship maintenance plans. This paper proposes a two-stage optimization (TSO) algorithm that combines the Genetic Algorithm (GA) and Long Short-Term Memory (LSTM) network, capable of simultaneously optimizing input features and model parameters to enhance the accuracy and generalization ability of speed prediction models. Additionally, a performance degradation assessment method based on speed loss is provided, aimed at evaluating the degradation of hull and propeller performance, as well as extracting the performance degradation paths. The results indicated that the proposed TSO-LSTM-GA algorithm significantly outperformed existing baseline models. Furthermore, the provided performance degradation assessment method demonstrated certain effectiveness on the target ship data, with a measured degradation rate of 0.00344 kn/d and a performance degradation of 9.569% over 478 days, corresponding to an annual speed loss of 1.257 kn.
Full article
(This article belongs to the Section Ocean Engineering)
Open AccessArticle
Temperature-Dependent Post-Cyclic Mechanical Characteristics of Interfaces between Geogrid and Marine Reef Sand: Experimental Research and Machine Learning Modeling
by
Zhiming Chao, Haoyu Wang, Jinhai Zheng, Danda Shi, Chunxu Li, Gege Ding and Xianhui Feng
J. Mar. Sci. Eng. 2024, 12(8), 1262; https://doi.org/10.3390/jmse12081262 - 26 Jul 2024
Abstract
The mechanical response of the marine reef sand–geogrid (RG) interface can be influenced by a high-temperature climate, grain size, and variable stress environments. These factors are critical to the effectiveness of geogrid reinforcement in reef sand engineering. However, there are few studies on
[...] Read more.
The mechanical response of the marine reef sand–geogrid (RG) interface can be influenced by a high-temperature climate, grain size, and variable stress environments. These factors are critical to the effectiveness of geogrid reinforcement in reef sand engineering. However, there are few studies on the influences of grain size, temperature, and stress history on the mechanical characteristics of RG interfaces, with most studies centering on the influence of single factors on the mechanical characteristics of RG interfaces. In this paper, based on self-developed temperature-controlled large interface shear equipment, a series of before/post-cyclic shear tests were carried out on RG interfaces in the temperature range of 5–80 °C. The impact of different reef sand grain sizes on the RG interface was explored (S1: 1–2 mm; S2: 2–4 mm). It was shown that temperature and grain size had significant influences on the mechanical characteristics of the RS interface. Compared with the S1 RG interfaces, the S2 RG interfaces had higher sensitivity to temperature changes with respect to the before/post-cyclic maximum shear strength. Moreover, in comparison to the before-cyclic shear strength, the post-cyclic maximum shear strength is more responsive to temperature changes. The before/post-cyclic maximum shear strength of the S2 RG interfaces was greater than the maximum shear strength of the S1 RG interfaces as the temperature changed. Based on the results of physical tests, a machine learning model containing 450 datasets was constructed, which can accurately predict the shear strength of the RG interface.
Full article
(This article belongs to the Section Coastal Engineering)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01262/article_deploy/html/images/jmse-12-01262-g001-550.jpg?1722003852)
Figure 1
Open AccessArticle
Dynamic Response Analysis of a Subsea Rigid M-Shaped Jumper under Combined Internal and External Flows
by
Guangzhao Li, Wenhua Li, Shanying Lin, Fenghui Han and Xingkun Zhou
J. Mar. Sci. Eng. 2024, 12(8), 1261; https://doi.org/10.3390/jmse12081261 - 26 Jul 2024
Abstract
To analyze the dynamic response of a rigid M-shaped jumper subjected to combined internal and external flows, a one-way coupled fluid–structure interaction process is applied. First, CFD simulations are conducted separately for the internal and external fluid domains. The pressure histories on the
[...] Read more.
To analyze the dynamic response of a rigid M-shaped jumper subjected to combined internal and external flows, a one-way coupled fluid–structure interaction process is applied. First, CFD simulations are conducted separately for the internal and external fluid domains. The pressure histories on the inner and outer walls are exported and loaded into the finite element model using inverse distance interpolation. Then, FEA is performed to determine the dynamic response, followed by a fatigue assessment based on the obtained stress data. The displacement, acceleration, and stress distribution along the M-shaped jumper are obtained. External flow velocity dominates the displacements, while internal flow velocity dominates the vibrations and stresses. The structural response to the combined effect of internal and external flows, plus the response to gravity alone, equals the sum of the structural responses to internal flow alone and external flow alone. Fatigue damage is calculated for the bend exhibiting the most intense vibration and higher stress levels, and the locations with significant damage correspond to areas with high maximum von Mises stress. This paper aims to evaluate multiple flow fields acting simultaneously on subsea pipelines and to identify the main factors that provide valuable information for their design, monitoring, and maintenance.
Full article
(This article belongs to the Special Issue The State of the Art of Marine Risers and Pipelines)
Open AccessArticle
Study on the Dynamic Response of Offshore Triceratops under Freak Waves
by
Nagavinothini Ravichandran and Butsawan Bidorn
J. Mar. Sci. Eng. 2024, 12(8), 1260; https://doi.org/10.3390/jmse12081260 - 26 Jul 2024
Abstract
Freak waves are characterized by extreme wave height, irregular wave shape, high peak energy, short duration, and formidable destructive potential, posing a significant threat to offshore structures. Therefore, analyzing dynamic responses exhibited by advanced offshore platforms such as the offshore triceratops under the
[...] Read more.
Freak waves are characterized by extreme wave height, irregular wave shape, high peak energy, short duration, and formidable destructive potential, posing a significant threat to offshore structures. Therefore, analyzing dynamic responses exhibited by advanced offshore platforms such as the offshore triceratops under the influence of freak waves holds paramount importance. However, the response analysis of offshore triceratops under freak waves has not been explored so far in the literature. Hence, the present study aims to investigate the dynamics of offshore triceratops intended for ultradeep waters under the impact of freak waves. Initially, the dual superposition model was utilized to generate the freak waves, and the numerical model of the platform was developed using ANSYS AQWA. Subsequently, the dynamic response characteristics of offshore triceratops under the influence of freak waves were analyzed in the time domain. The results demonstrate the effects of freak waves on the surge, heave, and pitch responses of the deck and buoyant legs were substantial, leading to a significant increase in maximum responses and variations in mean shift and standard deviations. The innovative insights derived from this study can serve as a benchmark for validating the effective performance and design of offshore triceratops.
Full article
(This article belongs to the Special Issue Impact of Ocean Wave Loads on Marine Structures)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01260/article_deploy/html/images/jmse-12-01260-g001-550.jpg?1721980177)
Figure 1
Open AccessArticle
Reproductive Biology of Pearl Oyster (Pinctada radiata, Leach 1814) Based on Microscopic and Macroscopic Assessment of Both Sexes in the Eastern Mediterranean (South Evia Island)
by
Dimitris Pafras, Chrysoula Apostologamvrou, Athina Balatsou, Alexandros Theocharis, Alexios Lolas, Marianthi Hatziioannou, Dimitris Vafidis and Dimitris Klaoudatos
J. Mar. Sci. Eng. 2024, 12(8), 1259; https://doi.org/10.3390/jmse12081259 - 25 Jul 2024
Abstract
The Atlantic pearl oyster, Pinctada radiata (Leach, 1814), is an Indo-Pacific bivalve of the subtidal zone that has colonized habitats all over the Mediterranean. There is a lack of detailed information on the reproductive activity of P. radiata in Hellenic waters, especially following
[...] Read more.
The Atlantic pearl oyster, Pinctada radiata (Leach, 1814), is an Indo-Pacific bivalve of the subtidal zone that has colonized habitats all over the Mediterranean. There is a lack of detailed information on the reproductive activity of P. radiata in Hellenic waters, especially following the recent amendment of national legislation aiming to regulate the fishery and prevent illegal fishing and trafficking as a substitute for indigenous oysters. A total of 703 individuals were collected by scuba diving from the southwest part of Evia Island. Gonad microscopic examination indicated that gametogenesis occurs from February to September, with a recovery stage in early autumn. Synchronicity occurs for both sexes, with temperature being the main controlling factor. The annual recruitment pattern indicated two prominent peaks of similar magnitude. Analysis of covariance indicated a significant temperature effect on gonad index above 22 degrees. Onset of sexual maturity (L50) was estimated at 47.2 mm in shell height and 27.09 gr in total weight for the entire population. The sex ratio was in favor of females at 1:1.70, with 7% and 19% of the individuals assessed macroscopically and microscopically identified as hermaphrodites, respectively. Results offer valuable information for the management and conservation of pearl oyster populations.
Full article
(This article belongs to the Special Issue Biodiversity and Population Ecology of Marine Invertebrates)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01259/article_deploy/html/images/jmse-12-01259-g001-550.jpg?1721995992)
Figure 1
Open AccessArticle
Experimental Assessment of Ultraviolet Radiation Impact on the Primary Production of Phytoplankton in the East/Japan Sea
by
Misun Yun, Jae-Joong Kang, Yubeen Jeong, Young-Heon Jo, Jun Sun and Sang-Heon Lee
J. Mar. Sci. Eng. 2024, 12(8), 1258; https://doi.org/10.3390/jmse12081258 - 25 Jul 2024
Abstract
Solar radiation, particularly ultraviolet radiation (UVR, 280–400 nm), is known to play a significant role in driving primary production in marine ecosystems. However, our understanding of the specific effects of UVR on the primary production of natural phytoplankton communities is still limited. We
[...] Read more.
Solar radiation, particularly ultraviolet radiation (UVR, 280–400 nm), is known to play a significant role in driving primary production in marine ecosystems. However, our understanding of the specific effects of UVR on the primary production of natural phytoplankton communities is still limited. We utilized the 13C stable isotope to quantify primary production and conducted experiments using different types of incubation bottles (polycarbonate and quartz bottles) to compare the primary production in the absence and presence of UVR. Although we observed a weak inhibitory effect at the surface of the water column, UVR exposure resulted in an approximately 1.5-fold increase in primary production over the euphotic zone. The enhanced primary production during the study period can be attributed to the combined effect of low UVB (280–320 nm) dose and abundant nutrient conditions. Notably, our size-fractionated measurements revealed that UVR exposure led to a two-fold increase in primary production in large cells (>2 μm) compared to the exposure of solely photosynthetically active radiation (PAR). In contrast, there was no significant difference in the primary production of small cells (<2 μm) between the absence and presence of UVR. These findings highlight the advantages of large cells when exposed to UVR, emphasizing the importance of phytoplankton cell size in determining their response to UVR. However, it is important to note that the effects of UVR on phytoplankton are influenced by various environmental factors, which interact with solar radiation, shaping the dynamics of phytoplankton responses to UVR.
Full article
(This article belongs to the Section Marine Environmental Science)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01258/article_deploy/html/images/jmse-12-01258-g001-550.jpg?1721988844)
Figure 1
Open AccessArticle
Recent Data on Nematode Infestation of Anchovy (Engraulis encrasicolus) on the Romanian Black Sea Coast
by
Aurelia Țoțoiu, Magda Nenciu and Victor Niță
J. Mar. Sci. Eng. 2024, 12(8), 1257; https://doi.org/10.3390/jmse12081257 - 25 Jul 2024
Abstract
Marine fish populations can be affected by various infectious and parasitic diseases. The species investigated during 2021–2023 along the Romanian coast was European anchovy [Engraulis encrasicolus (Linnaeus, 1758)], a small pelagic fish with both economic and ecological value. Four species of endoparasites
[...] Read more.
Marine fish populations can be affected by various infectious and parasitic diseases. The species investigated during 2021–2023 along the Romanian coast was European anchovy [Engraulis encrasicolus (Linnaeus, 1758)], a small pelagic fish with both economic and ecological value. Four species of endoparasites (nematodes) were identified, namely: Hysterothylacium sp. Ward & Magath, 1917, Contracaecum sp. Railliet & Henry, 1912, Porrocaecum sp. Railet & Henry, 1912, and Anisakis sp. Dujardin, 1845. Nematode worms were found as larvae and infested the abdominal cavity, both in the free state and enclosed in internal organs. The parameters analyzed included abundance, prevalence, and average intensity. Abundance results indicated 14 parasites/fish in length classes ranging from 11–12 cm. A prevalence of 100% was reported in the anchovy population sampled from several stations. A high level of infestation intensity was recorded in 11 cm long specimens (15 nematode worms/host). In this study, the accumulation of nematode worms was observed in large mature specimens, with a negative impact on the host organism through the presence of internal lesions, slowing of growth rate, appetite reduction, and disturbance of the reproductive process. The potential risks to anchovy stock status, threats to human health, and control measures are also tackled.
Full article
(This article belongs to the Section Marine Biology)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01257/article_deploy/html/images/jmse-12-01257-g001-550.jpg?1721983686)
Figure 1
Open AccessArticle
Node Adjustment Scheme of Underwater Wireless Sensor Networks Based on Motion Prediction Model
by
Han Zheng, Haonan Chen, Anqi Du, Meijiao Yang, Zhigang Jin and Ye Chen
J. Mar. Sci. Eng. 2024, 12(8), 1256; https://doi.org/10.3390/jmse12081256 - 25 Jul 2024
Abstract
With the wide application of Underwater Wireless Sensor Networks (UWSNs) in various fields, more and more attention has been paid to deploying and adjusting network nodes. A UWSN is composed of nodes with limited mobility. Drift movement leads to the network structure’s destruction,
[...] Read more.
With the wide application of Underwater Wireless Sensor Networks (UWSNs) in various fields, more and more attention has been paid to deploying and adjusting network nodes. A UWSN is composed of nodes with limited mobility. Drift movement leads to the network structure’s destruction, communication performance decline, and node life-shortening. Therefore, a Node Adjustment Scheme based on Motion Prediction (NAS-MP) is proposed, which integrates the layered model of the ocean current’s uneven depth, the layered ocean current prediction model based on convolutional neural network (CNN)–transformer, the node trajectory prediction model, and the periodic depth adjustment model based on the Seagull Optimization Algorithm (SOA), to improve the network coverage and connectivity. Firstly, the error threshold of the current velocity and direction in the layer was introduced to divide the depth levels, and the regional current data model was constructed according to the measured data. Secondly, the CNN–transformer hybrid network was used to predict stratified ocean currents. Then, the prediction data of layered ocean currents was applied to the nodes’ drift model, and the nodes’ motion trajectory prediction was obtained. Finally, based on the trajectory prediction of nodes, the SOA obtained the optimal depth of nodes to optimize the coverage and connectivity of the UWSN. Experimental simulation results show that the performance of the proposed scheme is superior.
Full article
(This article belongs to the Special Issue Underwater Wireless Communications: Recent Advances and Challenges)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01256/article_deploy/html/images/jmse-12-01256-g001-550.jpg?1721908578)
Figure 1
Open AccessArticle
A Method for Defogging Sea Fog Images by Integrating Dark Channel Prior with Adaptive Sky Region Segmentation
by
Kongchi Hu, Qingyan Zeng, Junyan Wang, Jianqing Huang and Qi Yuan
J. Mar. Sci. Eng. 2024, 12(8), 1255; https://doi.org/10.3390/jmse12081255 - 25 Jul 2024
Abstract
Due to the detrimental impact of fog on image quality, dehazing maritime images is essential for applications such as safe maritime navigation, surveillance, environmental monitoring, and marine research. Traditional dehazing techniques, which are dependent on presupposed conditions, often fail to perform effectively, particularly
[...] Read more.
Due to the detrimental impact of fog on image quality, dehazing maritime images is essential for applications such as safe maritime navigation, surveillance, environmental monitoring, and marine research. Traditional dehazing techniques, which are dependent on presupposed conditions, often fail to perform effectively, particularly when processing sky regions within marine fog images in which these conditions are not met. This study proposes an adaptive sky area segmentation dark channel prior to the marine image dehazing method. This study effectively addresses challenges associated with traditional marine image dehazing methods, improving dehazing results affected by bright targets in the sky area and mitigating the grayish appearance caused by the dark channel. This study uses the grayscale value of the region boundary’s grayscale discontinuity characteristics, takes the grayscale value with the least number of discontinuity areas in the grayscale histogram as a segmentation threshold adapted to the characteristics of the sea fog image to segment bright areas such as the sky, and then uses grayscale gradients to identify grayscale differences in different bright areas, accurately distinguishing boundaries between sky and non-sky areas. By comparing the area parameters, non-sky blocks are filled; this adaptively eliminates interference from other bright non-sky areas and accurately locks the sky area. Furthermore, this study proposes an enhanced dark channel prior approach that optimizes transmittance locally within sky areas and globally across the image. This is achieved using a transmittance optimization algorithm combined with guided filtering technology. The atmospheric light estimation is refined through iterative adjustments, ensuring consistency in brightness between the dehazed and original images. The image reconstruction employs calculated atmospheric light and transmittance values through an atmospheric scattering model. Finally, the use of gamma-correction technology ensures that images more accurately replicate natural colors and brightness levels. Experimental outcomes demonstrate substantial improvements in the contrast, color saturation, and visual clarity of marine fog images. Additionally, a set of foggy marine image data sets is developed for monitoring purposes. Compared with traditional dark channel prior dehazing techniques, this new approach significantly improves fog removal. This advancement enhances the clarity of images obtained from maritime equipment and effectively mitigates the risk of maritime transportation accidents.
Full article
(This article belongs to the Section Ocean Engineering)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01255/article_deploy/html/images/jmse-12-01255-g001-550.jpg?1721898633)
Figure 1
Open AccessArticle
Numerical Studies on the Hydrodynamic Patterns and Energy-Saving Advantages of Fish Swimming in Vortical Flows of an Upstream Cylinder
by
Xing Chang, Bowen Ma and Jianjian Xin
J. Mar. Sci. Eng. 2024, 12(8), 1254; https://doi.org/10.3390/jmse12081254 - 25 Jul 2024
Abstract
Fish in nature can extract the vortex energies from the environment to enhance their swimming performance. This paper numerically investigated the hydrodynamic characteristics and the energy-saving advantages of an undulating fish-like body behind the vortical flows generated by an upstream cylinder. The numerical
[...] Read more.
Fish in nature can extract the vortex energies from the environment to enhance their swimming performance. This paper numerically investigated the hydrodynamic characteristics and the energy-saving advantages of an undulating fish-like body behind the vortical flows generated by an upstream cylinder. The numerical model was based on a robust ghost cell immersed boundary method for the solution of incompressible flows around arbitrary complex flexible boundaries. We examined the dynamic characteristics, the swimming performance, and the wake structures of the downstream fish under different locations and diameters of the cylinder in a wide range of Strouhal numbers. It was found that the average drag coefficient was significantly reduced in the presence of the upstream cylinder, while the RMS (root mean square) lift coefficients were very close for different locations and diameters of the cylinder as well as in the fish-only case. Therefore, the downstream fish gain efficiency and thrust enhancement by capturing energies from the vortex flows, which are more significant for smaller Strouhal numbers (St). However, the swimming efficiency converges to near 0.12 at St = 1.2 for different locations and diameters of the upstream cylinder, just slightly higher than that of the fish-only case. The fish can experience the thrust in not only the von-Kármán vortex street, but also the reversed one. In addition, the fish can be situated in the extended shear layer region and the fully developed wake region dependent on the position and diameter of the upstream cylinder, leading to abundant wake modes such as the splitting, coalescing, and competing of vortices.
Full article
(This article belongs to the Section Ocean Engineering)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01254/article_deploy/html/images/jmse-12-01254-g001-550.jpg?1721894383)
Figure 1
Open AccessEditorial
Advances in Marine Engineering: Geological Environment and Hazards II
by
Xingsen Guo, Xiaolei Liu and Thorsten Stoesser
J. Mar. Sci. Eng. 2024, 12(8), 1253; https://doi.org/10.3390/jmse12081253 - 25 Jul 2024
Abstract
In October 2021, the editorial office invited Prof [...]
Full article
(This article belongs to the Special Issue Advances in Marine Engineering: Geological Environment and Hazards II)
Open AccessArticle
Modelled Water and Phosphorus Transports in the Archipelago Sea and through the Åland Sea in the Northern Baltic Sea and Their Links to Water Quality
by
Harri Helminen and Arto Inkala
J. Mar. Sci. Eng. 2024, 12(8), 1252; https://doi.org/10.3390/jmse12081252 - 24 Jul 2024
Abstract
The Baltic Sea is currently classified as ‘affected by eutrophication’. In this study, water exchanges and net phosphorus flows in the Archipelago Sea and through the Åland Sea from the Baltic proper was estimated with the aid of a 3-D hydrodynamic model for
[...] Read more.
The Baltic Sea is currently classified as ‘affected by eutrophication’. In this study, water exchanges and net phosphorus flows in the Archipelago Sea and through the Åland Sea from the Baltic proper was estimated with the aid of a 3-D hydrodynamic model for the years 2000–2021. The modelling configuration is based on the Copernicus regional reanalysis data. Water flowed from the Baltic proper to the Bothnian Sea at 669 km3/a and out from there at 879 km3/a. The inflow occurred in the deep-water layer (over 40 m), while the outflow occurred in the surface layer (0–40 m). With the inflow, 14,500 tons/a of phosphorus were transported during the years 2000–2014, but the amount increased to 20,300 tons per year from 2015 to 2021. At the same time, the winter-time concentrations of DIP in the Bothnian Sea almost doubled. In the Archipelago Sea, the main flow direction of water was from south to north from 2000 to 2014. From 2015 to 2021, the net flow direction reversed, and water flowed from the Archipelago Sea to the Baltic proper in the surface layer at a rate of 140 km3/a. At the same time, the background loading of phosphorus entering the Archipelago Sea with the flows decreased significantly and the chlorophyll-a concentration decreased below the threshold for a good ecological status. The U-turn in surface currents in the Archipelago Sea since 2015 may be related to variations in upwellings caused by climate change.
Full article
(This article belongs to the Section Marine Environmental Science)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01252/article_deploy/html/images/jmse-12-01252-g001-550.jpg?1721899244)
Figure 1
Open AccessArticle
Failure Consequence Cost Analysis of Wave Energy Converters—Component Failures, Site Impacts, and Maintenance Interval Scenarios
by
Mitra Kamidelivand, Peter Deeney, Jimmy Murphy, José Miguel Rodrigues, Paula B. Garcia-Rosa, Mairead Atcheson Cruz, Giacomo Alessandri and Federico Gallorini
J. Mar. Sci. Eng. 2024, 12(8), 1251; https://doi.org/10.3390/jmse12081251 - 24 Jul 2024
Abstract
In the early stages of developing wave energy converter (WEC) projects, a quantitative assessment of component failure consequence costs is essential. The WEC types, deployment site features, and accessibility should all be carefully considered. This study introduces an operation and maintenance failure consequence
[...] Read more.
In the early stages of developing wave energy converter (WEC) projects, a quantitative assessment of component failure consequence costs is essential. The WEC types, deployment site features, and accessibility should all be carefully considered. This study introduces an operation and maintenance failure consequence cost (O&M-FC) model, distinct from conventional O&M models. The model is illustrated with case studies at three energetic Atlantic sites, each of which considers two types of generic floating WECs: a 300 kW point absorber (PA) with a hydraulic power-take-off (PTO) and a 1000 kW oscillating water column (OWC) with an air-wells-turbine PTO. This study compares 39 failure modes for PA and 27 for OWC in terms of direct repair costs and indirect lost production costs, examining the impact of location accessibility, capacity factors, and the mean annual energy production. The discussion revolves around the sensitive parameters. Recommendations for failure mitigations are presented, and the impact of planned maintenance (PM) during the operational phase is examined for 20 MW PA and OWC WEC projects. For a given WEC type, the method thoroughly evaluates how the location affects performance metrics. It offers a decision-making tool for determining optimal PM intervals to meet targets such as O&M costs, operating profit, or availability.
Full article
(This article belongs to the Section Marine Energy)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01251/article_deploy/html/images/jmse-12-01251-g001-550.jpg?1721814494)
Figure 1
Open AccessArticle
Photogrammetry of the Deep Seafloor from Archived Unmanned Submersible Exploration Dives
by
Claudia H. Flores and Uri S. ten Brink
J. Mar. Sci. Eng. 2024, 12(8), 1250; https://doi.org/10.3390/jmse12081250 - 24 Jul 2024
Abstract
Large amounts of video images have been collected for decades by scientific and governmental organizations in deep (>1000 m) water using manned and unmanned submersibles and towed cameras. The collected images were analyzed individually or were mosaiced in small areas with great effort.
[...] Read more.
Large amounts of video images have been collected for decades by scientific and governmental organizations in deep (>1000 m) water using manned and unmanned submersibles and towed cameras. The collected images were analyzed individually or were mosaiced in small areas with great effort. Here, we provide a workflow for utilizing modern photogrammetry to construct virtual geological outcrops hundreds or thousands of meters in length from these archived video images. The photogrammetry further allows quantitative measurements of these outcrops, which were previously unavailable. Although photogrammetry had been carried out in recent years in the deep sea, it had been limited to small areas with pre-defined overlapping dive paths. Here, we propose a workflow for constructing virtual outcrops from archived exploration dives, which addresses the complicating factors posed by single non-linear and variable-speed vehicle paths. These factors include poor navigation, variable lighting, differential color attenuation due to variable distance from the seafloor, and variable camera orientation with respect to the vehicle. In particular, the lack of accurate navigation necessitates reliance on image quality and the establishment of pseudo-ground-control points to build the photogrammetry model. Our workflow offers an inexpensive method for analyzing deep-sea geological environments from existing video images, particularly when coupled with rock samples.
Full article
(This article belongs to the Special Issue Marine Geophysical Exploration and Underwater Digital Twin Technology Application)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01250/article_deploy/html/images/jmse-12-01250-g001-550.jpg?1721812335)
Figure 1
Open AccessArticle
Seasonal and Interannual Variability in Sea Surface Temperature Fronts in the Levantine Basin, Mediterranean Sea
by
Anıl Akpınar
J. Mar. Sci. Eng. 2024, 12(8), 1249; https://doi.org/10.3390/jmse12081249 - 24 Jul 2024
Abstract
Sea surface temperature (SST) fronts were analyzed in the Levantine Basin of the Mediterranean Sea over a 20-year period (2003–2022) using a high-resolution (~1 km) satellite dataset. Frontal gradients were strongest in regions of freshwater influence and around the Ierapetra eddies and Rhodes
[...] Read more.
Sea surface temperature (SST) fronts were analyzed in the Levantine Basin of the Mediterranean Sea over a 20-year period (2003–2022) using a high-resolution (~1 km) satellite dataset. Frontal gradients were strongest in regions of freshwater influence and around the Ierapetra eddies and Rhodes Gyre. Seasonally, maximum frontal activity was observed in fall and summer. Empirical orthogonal function (EOF) analysis revealed both monthly-to-seasonal variability and interannual variability in frontal gradients. Seasonal frontal variability is partially explained by atmospheric forcing; that is, wind stress curl (WSC) and net air–sea heat flux. The maximum frontal activity was observed in 2006, coinciding with the strongest WSC magnitude. The minimum frontal activity was observed in 2017, which saw the largest winter heat loss to the atmosphere. The highest frontal activity was typically observed in years with mild winters followed by strong Etesian winds. Over the study period (2003–2022), frontal gradients declined in the Levantine Basin. Our results suggest that years with a strong frontal boundary current (Asia Minor Current; AMC) coincide with reduced cross-shelf transport. Subsequent studies are recommended to concentrate on the variability in the frontal intensity of the AMC and associated cross-shelf transports, which are important for the oligotrophic Levantine Basin.
Full article
(This article belongs to the Section Physical Oceanography)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01249/article_deploy/html/images/jmse-12-01249-g001-550.jpg?1721809612)
Figure 1
Open AccessArticle
Enhancement of Biodegradation and Detoxification of Methylene Blue by Preformed Biofilm of Thermophilic Bacilli on Polypropylene Perforated Balls
by
Vincenzo Zammuto, Angela Macrì, Eleonora Agostino, Lorenzo Maria Ruggeri, Maria Teresa Caccamo, Salvatore Magazù, Victor L. Campos, Paulina Aguayo, Salvatore Guglielmino and Concetta Gugliandolo
J. Mar. Sci. Eng. 2024, 12(8), 1248; https://doi.org/10.3390/jmse12081248 - 23 Jul 2024
Abstract
Microbial degradation represents an eco-friendly alternative to traditional physicochemical treatments in removing persistent and toxic environmental pollutants, including synthetic dyes (i.e., methylene blue, MB) employed in different industries. The exploitation of thermophilic bacilli, such as those isolated from the shallow hydrothermal vents of
[...] Read more.
Microbial degradation represents an eco-friendly alternative to traditional physicochemical treatments in removing persistent and toxic environmental pollutants, including synthetic dyes (i.e., methylene blue, MB) employed in different industries. The exploitation of thermophilic bacilli, such as those isolated from the shallow hydrothermal vents of the Eolian Islands (Italy), could provide valuable resources for the treatment of warm, dye-containing wastewater. In this study, we evaluated the ability of preformed biofilms on polypropylene perforated balls (BBs) of fifteen thermophilic bacilli, to decolor, degrade, and detoxify MB in aqueous solutions. Among them, BBs of Bacillus licheniformis B3-15 and Bacillus sp. s7s-1 were able to decolorize MB more than 50% in saline solution (NaCl 2%), incubated in static conditions at 45 °C for 48 h. At optimized initial conditions (10 mg L−1 MB, pH 5.2 for B3-15 or pH 4 for s7s-1), the two strains enhanced their decolorization potential, reaching 96% and 67%, respectively. As indicated by ATR-FTIR spectroscopy, the treatment with BB B3-15 was the most efficient in degrading the Cl–C and –NH groups of MB. This degraded solution was 40% less toxic than undegraded MB, and it has no impact on the bioluminescence of Vibrio harveyi, nor the growth of the marine diatom Phaeodactylum tricornutum. Biofilm formed by strain B3-15 on polypropylene perforated balls could be proposed as a component of bioreactors in the treatment of warm, dye-containing wastewater to concomitantly remediate MB pollution and simultaneously counteract harmful effects in aquatic environments.
Full article
(This article belongs to the Special Issue Marine Microorganisms and Their Biomolecules: Biodiversity, Physiological Adaptation and Biotechnological Applications)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01248/article_deploy/html/images/jmse-12-01248-g001-550.jpg?1721875908)
Figure 1
Open AccessArticle
Leaky Wave Modes and Edge Waves in Land-Fast Ice Split by Parallel Cracks
by
Aleksey Marchenko, Mark Johnson and Dmitry Brazhnikov
J. Mar. Sci. Eng. 2024, 12(8), 1247; https://doi.org/10.3390/jmse12081247 - 23 Jul 2024
Abstract
In this paper we consider flexural-gravity waves propagating in a layer of water of constant depth limited by a vertical wall simulating a straight coastline. The water surface is covered with an elastic ice sheet of constant thickness. The ice sheet is split
[...] Read more.
In this paper we consider flexural-gravity waves propagating in a layer of water of constant depth limited by a vertical wall simulating a straight coastline. The water surface is covered with an elastic ice sheet of constant thickness. The ice sheet is split by one or two straight cracks parallel to the coastline, simulating the structure of land-fast ice with a refrozen lead. Analytical solutions of hydrodynamic equations describing the interaction of flexural-gravity waves with the ice sheet and cracks have been constructed and studied. In this paper, the amplification of the amplitude of incident waves between the shoreline and cracks was described depending on the incident angle of the wave coming from offshore. The constructed solutions allow the existence of edge waves propagating along the coastline and attenuated offshore. The energy of edge waves is trapped between the coastline and ice cracks. The application of the constructed solutions to describe wave phenomena observed in the land-fast ice of the Arctic shelf of Alaska is discussed.
Full article
(This article belongs to the Special Issue Recent Research on the Measurement and Modeling of Sea Ice)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01247/article_deploy/html/images/jmse-12-01247-g001-550.jpg?1721903723)
Figure 1
Open AccessArticle
Distributed Optimization-Based Path Planning for Multiple Unmanned Surface Vehicles to Pass through Narrow Waters
by
Shuo Li, Fei Teng, Geyang Xiao and Haoran Zhao
J. Mar. Sci. Eng. 2024, 12(8), 1246; https://doi.org/10.3390/jmse12081246 - 23 Jul 2024
Abstract
Safety and efficiency are important when Unmanned Surface Vehicles (USVs) pass through narrow waters in complex marine environments. This paper considers the issue of path planning for USVs passing through narrow waterways. We propose a distributed optimization algorithm based on a polymorphic network
[...] Read more.
Safety and efficiency are important when Unmanned Surface Vehicles (USVs) pass through narrow waters in complex marine environments. This paper considers the issue of path planning for USVs passing through narrow waterways. We propose a distributed optimization algorithm based on a polymorphic network architecture, which maintains connectivity and avoids collisions between USVs while planning optimal paths. Firstly, the initial path through the narrow waterway is planned for each USV using the narrow water standard route method, and then the interpolating spline method is used to determine its corresponding functional form and rewrite the function as a local cost function for the USV. Secondly, a polymorphic network architecture and a distributed optimization algorithm were designed for multi-USVs to maintain connectivity and avoid collisions between USVs, and to optimize the initial paths of the multi-USV system. The effectiveness of the algorithm is demonstrated by Lyapunov stability analysis. Finally, Lingshui Harbor of Dalian Maritime University and a curved narrow waterway were selected for the simulation experiments, and the results demonstrate that the paths planned by multiple USVs were optimal and collision-free, with velocities achieving consistency within a finite time.
Full article
(This article belongs to the Special Issue Modeling and Control of Marine Craft)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01246/article_deploy/html/images/jmse-12-01246-g001-550.jpg?1721820951)
Figure 1
Open AccessArticle
Ship Autonomous Berthing Strategy Based on Improved Linear-Quadratic Regulator
by
Jian Yin, Guoquan Chen, Shenhua Yang, Zeyang Huang and Yongfeng Suo
J. Mar. Sci. Eng. 2024, 12(8), 1245; https://doi.org/10.3390/jmse12081245 - 23 Jul 2024
Abstract
There has been significant interest in the research field of ship automatic navigation, particularly in the area of autonomous berthing. To address the key challenges of path planning and control during ship berthing, we propose an enhanced Linear−Quadratic Regulator (LQR) control approach, reinforced
[...] Read more.
There has been significant interest in the research field of ship automatic navigation, particularly in the area of autonomous berthing. To address the key challenges of path planning and control during ship berthing, we propose an enhanced Linear−Quadratic Regulator (LQR) control approach, reinforced by the Covariance Matrix Adaptation Evolution Strategy (CMA−ES), along with an adaptive berthing strategy decision model. This integrated framework encompasses ship motion control, path planning, and berthing strategy selection to facilitate adaptive and autonomous ship berthing. Initially, a dynamic mathematical model of ship motion is established, taking into account wind and current interference effects. Subsequently, an adaptive environment−aware berthing strategy model is introduced to enable automatic selection of berthing strategies based on spatial relationships between environmental factors and the berth. By utilizing the refined LQR method, autonomous motion control for ship berthing is achieved. To validate the effectiveness of our controller, comprehensive simulation analyses are conducted under varying operating conditions to encompass crucial factors such as large drift angle characteristics of ships, shallow water effects, and bank effects across seven diverse working conditions. The simulation results underscore the robustness of our proposed method in responding to environmental interference while demonstrating its capability to select appropriate berthing strategies based on varying operational scenarios.
Full article
(This article belongs to the Special Issue Unmanned Marine Vehicles: Perception, Planning, Control and Swarm)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01245/article_deploy/html/images/jmse-12-01245-g001-550.jpg?1721887904)
Figure 1
Open AccessArticle
Prediction of Pier Scour Depth under Extreme Typhoon Storm Tide
by
Zongyu Li, Weiwei Lin, Dongdong Chu, Feng Liu, Zhilin Sun, Wankang Yang, Hanming Huang and Dan Xu
J. Mar. Sci. Eng. 2024, 12(8), 1244; https://doi.org/10.3390/jmse12081244 - 23 Jul 2024
Abstract
The Western Pacific region is highly vulnerable to typhoon storm surge disasters, with localized erosion posing a particularly prominent issue for coastal marine structures. The prevalence of extreme typhoon storm surges poses a significant threat to the safety of engineering projects in these
[...] Read more.
The Western Pacific region is highly vulnerable to typhoon storm surge disasters, with localized erosion posing a particularly prominent issue for coastal marine structures. The prevalence of extreme typhoon storm surges poses a significant threat to the safety of engineering projects in these areas. In this study, a parameterized wind field model with precise calculation of wind speed was employed to establish a numerical model for typhoon storm tides. Based on the Western Pacific typhoon data from 1949 to 2023, hydraulic simulations were conducted for Hangzhou Bay, Xiangshan Port, and Yueqing Bay, revealing maximum flow velocities of 4.5 m/s, 1.95 m/s, and 2.09 m/s, respectively. These velocities exceeded the maximum possible tidal flow by 0.47–1.17 m/s. Additionally, using Sun’s velocity formula, the initiation flow velocities were calculated to be 1.85 m/s, 1.81 m/s, and 2.06 m/s for the aforementioned locations. Through localized erosion tests conducted around typical bridge piers and the subsequent application of similarity criteria, the maximum depth of localized erosion in the study area was determined to range from 2.16 m to 16.1 m, which corresponds to 1.1–2.3 times the scour caused by the maximum tidal flow scenario. A comparison of the erosion test results with calculations based on several formulas demonstrated that the scour prediction formula proposed by Sun exhibited the highest accuracy. This study supplements the understanding of the impact of typhoon storm surges on bridge pier erosion and provides a scientific basis for the design of bridge foundations.
Full article
(This article belongs to the Section Physical Oceanography)
►▼
Show Figures
![](https://pub.mdpi-res.com/jmse/jmse-12-01244/article_deploy/html/images/jmse-12-01244-g001-550.jpg?1721742198)
Figure 1
![Journal of Marine Science and Engineering jmse-logo](https://pub.mdpi-res.com/img/journals/jmse-logo.png?7a9fe15cd28a3a0d)
Journal Menu
► ▼ Journal Menu-
- JMSE Home
- Aims & Scope
- Editorial Board
- Reviewer Board
- Topical Advisory Panel
- Instructions for Authors
- Special Issues
- Topics
- Sections
- Article Processing Charge
- Indexing & Archiving
- Editor’s Choice Articles
- Most Cited & Viewed
- Journal Statistics
- Journal History
- Journal Awards
- Society Collaborations
- Conferences
- Editorial Office
Journal Browser
► ▼ Journal BrowserHighly Accessed Articles
Latest Books
E-Mail Alert
News
Topics
Topic in
Atmosphere, Energies, JMSE, Sustainability, Wind
Wind, Wave and Tidal Energy Technologies in China
Topic Editors: Wei Shi, Qihu Sheng, Fengmei Jing, Dahai Zhang, Puyang ZhangDeadline: 31 July 2024
Topic in
Diversity, Ecologies, JMSE, Sustainability, Water
Marine Ecology, Environmental Stress and Management
Topic Editors: Michael Karydis, Maurizio AzzaroDeadline: 30 August 2024
Topic in
Applied Sciences, Climate, Ecologies, JMSE, Water, Sustainability
Climate Change and Aquatic Ecosystems: Impacts, Mitigation and Adaptation
Topic Editors: Helena Veríssimo, Tiago VerdelhosDeadline: 20 September 2024
Topic in
Aerospace, Applied Sciences, Batteries, Energies, JMSE, Machines, Mathematics, Sensors
Uncertainty Quantification in Design, Manufacturing and Maintenance of Complex Systems
Topic Editors: Chen Jiang, Zhenzhong Chen, Xiaoke Li, Xiwen Cai, Zan YangDeadline: 30 September 2024
![loading...](https://pub.mdpi-res.com/img/loading_circle.gif?9a82694213036313?1721979229)
Conferences
Special Issues
Special Issue in
JMSE
Advances in Coastal Hydrodynamic and Morphodynamic Processes under a Changing Climate
Guest Editors: Simone Simeone, Chatzipavlis AntonisDeadline: 30 July 2024
Special Issue in
JMSE
Challenges in Monitoring and Management of Water Quality in Coastal Areas
Guest Editor: Milva PepiDeadline: 5 August 2024
Special Issue in
JMSE
Non-conventional Coastal Protection Solutions
Guest Editors: Sara Corvaro, Mariano BuccinoDeadline: 31 August 2024
Special Issue in
JMSE
Modeling and Monitoring of Coastal Ocean, Nearshore and Estuarine Environments
Guest Editors: Zafer Defne, Mustafa Kemal CambazogluDeadline: 1 September 2024