Applied Ocean Research最新文献

{"title":"A 4 foils hydrofoiler regulation solution and experiments","authors":"Lionel Lapierre ,&nbsp;Laurent Latorre ,&nbsp;Loic Daridon ,&nbsp;Denis Julien ,&nbsp;Vincent Dufour","doi":"10.1016/j.apor.2025.104596","DOIUrl":"10.1016/j.apor.2025.104596","url":null,"abstract":"<div><div>This paper introduces the Black Pearl, a novel 4-foil electric hydrofoiler, by presenting its design, control structure, and experimental findings. The innovative aspect of our approach lies in the redundant design of the sustentation structure, which utilizes four independent foils to control three degrees of freedom: roll, pitch, and altitude above the water.</div><div>This redundancy improves actuation efficiency, significantly reducing the risk of actuation saturation. Moreover, the explicit management of this redundancy ensures robust actuation performance, even in scenarios where one foil becomes locked at a fixed angle.</div><div>The paper also presents experimental trials conducted on the Black Pearl prototype, as well as the proposal and simulation testing of novel guidance laws designed to enhance the hydrofoiler’s flight performance.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"160 ","pages":"Article 104596"},"PeriodicalIF":4.3,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental optimisation of the man overboard manoeuvre","authors":"Bas J. de Kruif,&nbsp;Bülent Düz,&nbsp;Victor Ferrari","doi":"10.1016/j.apor.2025.104603","DOIUrl":"10.1016/j.apor.2025.104603","url":null,"abstract":"<div><div>In maritime operations, the safety of crew and passengers is paramount, making the man overboard manoeuvre a critical emergency procedure for all vessels. Among the different ways to perform this manoeuvre, the Williamson turn is used to come back on its own wake to retrieve the man overboard. This manoeuvre is especially useful if it is not precisely known when the person fell overboard. During this manoeuvre the rudder is switched to its extremes at well defined heading deviations. The IAMSAR guideline provides standard values for these, but these values do not guarantee that the vessel will sail back on its own wake.</div><div>In this study we first estimated these switching angles with a numerical model and a data-driven model. Next, we used update rules to fine-tune these switching angles and tested those in a 1:24 model-scale experiment in one of MARIN’s basins.</div><div>After one iteration in the basin the lateral error and heading error were within DNV GL’s guidelines. The predicted switching angles from the numerical model were closer to the experimentally found values. However, the course and speed were better predicted with the data-driven model. The approach lends itself well to minimise commissioning time of a new vessel, and the switching angles found could be included on the wheelhouse-chart for a better execution of the Williamson turn.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"160 ","pages":"Article 104603"},"PeriodicalIF":4.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tall salt marshes play a crucial role in the long-term geomorphic evolution of the Jiuduansha wetland, Yangtze estuary, China","authors":"Hao Ma ,&nbsp;Lihua Wang ,&nbsp;Paula D. Pratolongo ,&nbsp;Guoxiang Wu ,&nbsp;Benwei Shi","doi":"10.1016/j.apor.2025.104623","DOIUrl":"10.1016/j.apor.2025.104623","url":null,"abstract":"<div><div>Salt marshes play a pivotal role in shaping coastal wetlands by influencing hydrodynamics and sediment transport, a topic that has garnered increasing attention in recent studies. However, the specific roles of different vegetation types in driving geomorphic evolution remain unclear. This study aims to assess the impact of varying salt marsh vegetation on the long-term geomorphic evolution of coastal wetlands. Using 1449 satellite images spanning 39 years (1984–2023) from the Google Earth Engine data archive, we investigated how different salt marsh types influences geomorphic changes on Jiuduansha Island, the largest uninhabited island in the Yangtze Estuary, China. Our analysis focused on the long-term salt marsh expansion and geomorphic evolution of Jiuduansha. The results revealed that the total area of Jiuduansha, as well as the extent of tall salt marshes, has increased significantly over the past decade. Notably, tall salt marshes exert a profound influence on geomorphic evolution. Specifically, in the accretionary sections of Jiuduansha Island, the natural expansion of tall salt marshes (<em>Spartina alterniflora</em> and <em>Phragmites australis</em>, with mean heights of 1.8 m and 2.5 m, respectively) drives seaward progradation. Conversely, in erosional sections, these tall salt marshes play a crucial role in mitigating further shoreline erosion. This study underscores the significant role of tall salt marshes in the long-term geomorphic evolution of coastal wetlands, offering valuable insights into the dynamics of wetland ecosystems and their resilience to environmental changes.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104623"},"PeriodicalIF":4.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vegetation stem dynamics under wave loading: Insights from a coupled fluid–structure model","authors":"Inga Prüter ,&nbsp;Felix Spröer ,&nbsp;Oliver Lojek ,&nbsp;Christian Windt ,&nbsp;David Schürenkamp ,&nbsp;Ioan Nistor ,&nbsp;Nils Goseberg","doi":"10.1016/j.apor.2025.104597","DOIUrl":"10.1016/j.apor.2025.104597","url":null,"abstract":"<div><div>Accurate replication of the stem motion of submerged aquatic vegetation is crucial to gain insights into its capacity for coastal protection and adaptability, such as the wave attenuation capacity and local sediment mobilization. The fluid–structure interaction solver within the numerical model REEF3D::CFD is validated, and then further employed to analyze vegetation stem motion and resulting drag forces, under wave loads using reference experiments, and covering a wide range of material properties and hydrodynamic conditions found in natural aquatic vegetation. Good agreement between simulated and experimental results is achieved for most test cases. This is expressed by less than 10<!--> <!-->% deviation of the simulated to the experimental forces and the stem positions relative to the stem length. To investigate possible sources of discrepancies between the numerical and experimental results, the flow field in front of the stem is compared with that measured during the reference experiments. Bending modes of stem movements provide further insights into the complex dynamic behavior of stems. Additionally, the study demonstrates the influence of the model’s built-in damping coefficients on the time-dependent stem movement under wave load for different material types. For all tested material types, the findings suggest that the use of damping coefficients ranging between 1 <span><math><mo>×</mo></math></span> 10^-8 and 1 <span><math><mo>×</mo></math></span> 10^-6 led to the successful replication of the stem dynamics and the resulting drag forces. Accurate predictions of vegetation response to wave loading require careful selection of the governing parameters in the structural model replicating the stem. Considering this, the proposed fluid–structure interaction solver proves highly effective for simulating a wide range of flexible, submerged vegetation stems.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104597"},"PeriodicalIF":4.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Track-to-track association from diverse source ship trajectory based on an improved graph neural network","authors":"Jiangnan Zhang ,&nbsp;Zhenxing Liu ,&nbsp;Yanhai Gan ,&nbsp;Yongshuo Liu ,&nbsp;Junyu Dong","doi":"10.1016/j.apor.2025.104598","DOIUrl":"10.1016/j.apor.2025.104598","url":null,"abstract":"<div><div>With the development of maritime surveillance technologies, large volumes of ship trajectory data have been collected through various monitoring methods. The accuracy of targets tracking can be significantly improved by associating these trajectories, particularly in cases of partial equipment monitoring failures. Different acquisition approaches and data standards of marine monitoring methods lead to differences in the quality and precision of ship trajectory data from diverse sources, which significantly affects the accuracy of track-to-track association. According to AIS and Radar trajectory data, a novel multi-graph neural network combined with Cross-Attention (CA-MGNN) is proposed to realize the association with precision bias. The MGNN module is employed to convert AIS and Radar trajectory points into corresponding features, which are extracted from multiple spatiotemporal dimensions. The interactive features are then constructed by Cross-Attention mechanism, thereby achieving the association based on trajectory features. Experimental results demonstrate that the proposed method achieves high efficiency with association accuracy of 92.61% and inference time of 83.4 (ms), thereby providing more accurate tracking information to meet the demands of maritime awareness application.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104598"},"PeriodicalIF":4.3,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear long-term vibration response prediction of offshore wind turbines under full operating conditions based on deep learning","authors":"Hong Bai ,&nbsp;Jianhua Zhang ,&nbsp;Ke Sun ,&nbsp;Won-Hee Kang","doi":"10.1016/j.apor.2025.104625","DOIUrl":"10.1016/j.apor.2025.104625","url":null,"abstract":"<div><div>Efficient prediction of the vibration response of offshore wind turbines plays a crucial role in proactively identifying potential vibration hazards and enabling real-time adjustments to operational strategies. The simulation methods are limited by lengthy computation times. In addition, pure data-driven prediction models suffer from limited adaptability to unseen conditions and lack constraints based on physical mechanisms. This paper presents a new method combining deep learning and OpenFAST simulation to predict the nonlinear long-term vibration response of offshore wind turbines. The approach is designed to encompass all operating conditions. Firstly, a multi-layer stacked BiLSTM architecture is designed to capture long sequences of time-series data. Recursive calculations are implemented using a sliding time window approach, while independent parallel computations are achieved through the multiprocessing technology. Subsequently, the time series data of 68 different wind-wave load scenarios are obtained through OpenFAST analysis, and the vibration response is predicted using the deep learning framework. Furthermore, the multi-input recursive BiLSTM obtained from the novel method is compared with the existing time series model. The results demonstrate that the proposed model accurately replicates both global and local features of time-history responses across diverse offshore wind turbine datasets. The average computation time is only 1/744.97 of that required by simulation models. Moreover, within a 10 s forecast duration, the model maintains an average online prediction accuracy of 91.94 % across all operational conditions. Under extreme conditions, the prediction accuracy is 29.71 % and 17.52 % higher than those of the end-to-end BiLSTM and RNN models, respectively. This proposed method is particularly suitable for applications where traditional numerical methods are limited, such as rapid simulations under real-time changes in operating conditions within complex marine environments.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104625"},"PeriodicalIF":4.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solid bulk cargo liquefaction: numerical investigation and proposal of safety envelopes","authors":"Piotr Kowalczyk,&nbsp;Susan Gourvenec","doi":"10.1016/j.apor.2025.104607","DOIUrl":"10.1016/j.apor.2025.104607","url":null,"abstract":"<div><div>Liquefaction of solid bulk cargo during marine transportation is a cause of loss of vessels and life at sea, however limited research has been conducted to understand the mechanism and reduce risks. The work presented in this paper addresses this subject from the soil mechanics perspective through simplified numerical assessment carried out by means of a coupled hydromechanical finite element analysis with an advanced effective stress constitutive model (PM4Sand). Typical responses of solid bulk cargo to dynamic loading are discussed in terms of generation of excess pore pressure and its changes during loading, alongside dissipation and changes in the state of the cargo post-loading. Results of parametric studies are presented and show how various geotechnical characteristics of solid bulk cargo contribute to the risk of liquefaction. The parametric analyses are summarized in a proposed new framework of simplified safety envelopes.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104607"},"PeriodicalIF":4.3,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combined effect of ice cover and length-to-diameter ratio on the wave resistance of a slender body","authors":"Alexandra Pogorelova","doi":"10.1016/j.apor.2025.104622","DOIUrl":"10.1016/j.apor.2025.104622","url":null,"abstract":"<div><div>In this study we considered the rectilinear motion of a slender body in fluid under an ice cover. The liquid is inviscid and incompressible. The ice cover was modeled as a floating viscoelastic plate, and the slender body was modeled as a source–sink system in a fluid flow. The strength of the sources and sinks and the distances between them depend on the body form. The shape of the bow is elliptical, the middle shape is cylindrical, and the stern has a parabolic shape. We considered bodies with varying length-to-diameter ratios (<em>L</em>/<em>D</em> = 6, 8, 10, 12, 14, and 16) by adjusting the length of the parallel mid-body. The influence of the <em>L</em>/<em>D</em>, ice cover thickness, submergence depth, and speed of the submerged body on the wave resistance was analyzed. Results show that for a thin ice cover, the critical Froude number depends on the <em>L</em>/<em>D</em>. For a thick ice cover, the critical Froude number depends on the ice plate thickness. For all considered cases of the <em>L</em>/<em>D</em> and ice cover thickness, the fully submergence and Milestone depths were obtained.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104622"},"PeriodicalIF":4.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Under-consolidation characteristics of an offshore marine clay from Yellow Sea, China","authors":"Mingzhu Li ,&nbsp;Miaojun Sun ,&nbsp;Zhigang Shan ,&nbsp;Minyun Hu ,&nbsp;Shuaifeng Wu ,&nbsp;Hong Cai ,&nbsp;Mingjing Jiang","doi":"10.1016/j.apor.2025.104591","DOIUrl":"10.1016/j.apor.2025.104591","url":null,"abstract":"<div><div>Consolidation characteristics of marine soils are crucially important to ocean reclamation, pile foundation design and construction, etc. A series of oedometer tests were conducted on samples from three different depths in north Yellow Sea, China, to disclose the consolidation properties of the marine soil. Intact and reconstituted samples, under seawater or freshwater condition, were tested in loading, unloading and reloading processes. The pre-consolidation pressure was determined by double logarithmic method, and the consolidation coefficients were evaluated by Taylor’s method. Results show that the compressibility of the tested marine clay is much lower than other reported marine soils, with low liquid limit (<em>w</em>_L = 35.34∼42.22 %), low water content (<em>w</em> = 23.08∼25.91 %) and low permeability (<em>k</em> = 0.82∼1.57 × 10^-7cm/s). The consolidation coefficient is of 10^-4cm²/s and can be increased up to 416 % when the sample processes reloading after undergoing unloading. The intact sample is lower in compression index and higher in consolidation coefficient than reconstituted samples. Besides, in tests of reconstituted samples with seawater, the compression index of marine sample can be reduced and the consolidation coefficient can be improved. The determined pre-consolidation pressure indicates that the marine samples from different depths are all under-consolidated, which was verified by CPTU tests and explained by Gibson’s theory for clay sedimentation under water.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104591"},"PeriodicalIF":4.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive output feedback control for a two-dimensional flexible riser system based on backstepping method","authors":"Jianhua Zhang ,&nbsp;Meng Wang ,&nbsp;Xiaoyu Wang ,&nbsp;Ke Sun","doi":"10.1016/j.apor.2025.104611","DOIUrl":"10.1016/j.apor.2025.104611","url":null,"abstract":"<div><div>This paper addresses the vibration control problem of a two-dimensional flexible riser system with uncertain parameters and unmeasurable states. Adaptive output feedback controllers are proposed based on the backstepping method to suppress the vibration of the riser system. To this end, parameter adaptive laws are designed to compensate for uncertainties in system parameters. Additionally, high-gain observers and disturbance observers are introduced to estimate and compensate for unmeasurable states and time-varying boundary disturbance caused by environmental loads. The well-posedness and stability of the closed-loop system are mathematically demonstrated. The performance of the proposed controllers is evaluated through simulation.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"159 ","pages":"Article 104611"},"PeriodicalIF":4.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}