Applied Ocean Research最新文献_第10页

Centrifuge modelling and the modified limit equilibrium prediction for drag embedment anchor installation in sand

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-01-01 DOI: 10.1016/j.apor.2024.104390

Ying Lai, Chuan Chen, Anhao Pan, Bin Zhu

{"title":"Centrifuge modelling and the modified limit equilibrium prediction for drag embedment anchor installation in sand","authors":"Ying Lai, Chuan Chen, Anhao Pan, Bin Zhu","doi":"10.1016/j.apor.2024.104390","DOIUrl":"10.1016/j.apor.2024.104390","url":null,"abstract":"<div><div>This study presents the measured trajectory, orientation, and capacity of drag embedment anchors (DEAs) in centrifugal installation tests conducted in sand. The 6-degree-of-freedom data obtained from the magnetometer directly verified two kinematic behaviors during the installation of DEAs: (1) the penetration of the drag anchor aligns with the orientation of its fluke; (2) its rotation corresponds to variations in the tension angle of the anchor line at the padeye. The slight increase in shear wave velocity of the soil beneath the fluke, as measured by the bender elements, directly confirmed the presence of the force behind the fluke. Based on these experimental observation, a modified DEA installation prediction model was developed using the limit equilibrium method. The predicted trajectory, pitch, and capacity of the model align well with the experimental results. The model also revealed the mechanism behind the limited capacity of DEA to resist vertical loads: an increase in the loading angle at the padeye decreases the failure angle, which reduces the volume of the three-dimensional failure soil wedge and, consequently, the anchor capacity. Finally, a series of parametric studies were conducted to analyze the influence of sand properties, the initial state of anchor, and other anchor parameters on the kinematic behavior and capacity performance of DEAs.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104390"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Autonomous detection, localization and tracking of ships by underwater acoustic sensing using vector sensor array

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-01-01 DOI: 10.1016/j.apor.2024.104389

Shweta Lokhande , A. Malarkodi , G. Latha , S. Srinivasan

{"title":"Autonomous detection, localization and tracking of ships by underwater acoustic sensing using vector sensor array","authors":"Shweta Lokhande , A. Malarkodi , G. Latha , S. Srinivasan","doi":"10.1016/j.apor.2024.104389","DOIUrl":"10.1016/j.apor.2024.104389","url":null,"abstract":"<div><div>Maritime security and surveillance demand advanced technologies for ship detection, localization, and tracking in vast oceanic environments. Acoustic sensing, particularly with Vector Sensor Arrays (VSAs), has become an efficient solution because it provides directional information of underwater sound signals. This paper presents the harbor trial of an indigenously developed, autonomous underwater vector sensor array system for detection, localization, and tracking of ships using acoustic sensing for coastal surveillance applications. The VSA system was deployed for one month, in the harbor area of Chennai, Acoustic pressure and three components of particle velocities measured by the vector sensor array are analyzed to study the different ship noise and localization of ships. In order to localize the ship noise, Direction of Arrival (DoA) and Range have been determined. DoA is estimated through MUSIC (Multiple Signal Classification) with Singular Value Decomposition (SVD) algorithm that leverage the directional sensing capabilities of VSA. Furthermore, ship tracking is performed for sequential detection and estimation to ensure continuous monitoring of ship movements. Also source level is estimated for the ships. Various acoustic levels and spectral densities are observed from the ships based on their speed, length, and distance from the VSA system. The results have been validated with the Automatic Identification System (AIS) data and they show that detection, localization and tracking of the ships using the VSA give good results. Autonomous acoustic sensing using VSA illustrates to be a promising approach for coastal surveillance and maritime security applications.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104389"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Current measurement by use of synchronous wave probes: Method and example of laboratory experiments for progressive or partially standing waves

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2025-01-01 DOI: 10.1016/j.apor.2024.104386

A. Cuevas , V. Rey , F. Ardhuin , J. Touboul

{"title":"Current measurement by use of synchronous wave probes: Method and example of laboratory experiments for progressive or partially standing waves","authors":"A. Cuevas , V. Rey , F. Ardhuin , J. Touboul","doi":"10.1016/j.apor.2024.104386","DOIUrl":"10.1016/j.apor.2024.104386","url":null,"abstract":"<div><div>In the context of studies of interactions between waves and currents, a method of calculation of the current through synchronous free surface deformation measurements at various locations is proposed and discussed in the case of either progressive or partially standing waves, and for either homogeneous or vertically sheared current. For partially standing waves, the method takes advantage of separation of incident and reflected wave method through minimization algorithms, which are still applicable in the limit case of a progressive wave. Discussions on the accuracy of the method are based on comparisons to laboratory experiments including regular and irregular waves in following or opposite current conditions. The vertically averaged current is recovered since current has a significant influence on the wave celerity. Vertically shear has less influence on the wave celerity in comparison to the averaged current in the experimental conditions considered, and is hardly directly recovered because of the noise inherent to the measurements. However the shear can be estimated through the calculated vertically averaged current which depends on frequency in the presence of shear. The present study concerns the unidirectional case, including regular or irregular waves.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104386"},"PeriodicalIF":4.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143166996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of wave-induced flow through marine porous media accounting for transition of seepage properties across multiple flow regimes 考虑多流型渗流特性转变的海洋多孔介质波浪渗流评价

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-12-01 DOI: 10.1016/j.apor.2024.104346

Shihuan Zou , Maosong Huang , Zhenhao Shi

{"title":"Evaluation of wave-induced flow through marine porous media accounting for transition of seepage properties across multiple flow regimes","authors":"Shihuan Zou , Maosong Huang , Zhenhao Shi","doi":"10.1016/j.apor.2024.104346","DOIUrl":"10.1016/j.apor.2024.104346","url":null,"abstract":"<div><div>Wave-induced flow through marine porous media has been attracting coastal engineers and researchers because of their strong correlation with scouring, internal erosion, piping and other destructions of marine porous structures. Previous studies chose Darcy-Forchheimer equation for wave-induced seepage behavior analyses because of its simplicity and perceptiveness. However, numerous experiment observations suggested that significant flow regime transition occurred in porous media with high variations in porosity and particle size, while Darcy-Forchheimer equation is only applicable to flow within Forchheimer regime. In this paper, a mathematical model linking the resistance of porous medium to its porosity and particle size is proposed to characterize the seepage properties across Darcy and Forchheimer regime under wave loadings. The proposed seepage model is then incorporated into volume-averaged Reynolds-averaged Navier-Stokes equations, and thus enabling evaluating fluid motions in waves and marine porous media via a unified framework. Through validation against experimental observations, analytical solutions and well accepted computed results in the literature, the proposed model is shown to replicate the characteristics of resistance of porous media with different porosities and particle sizes under different flow regimes. Numerical analyses are conducted to elucidate that seepage velocities of wave-induced flow in marine porous materials can be over- or under-estimated if not considering transitional seepage properties across multiple flow regimes. Such discrepancies can become significant when strong variations occur in porous media with respect to particle size and/or porosity.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104346"},"PeriodicalIF":4.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrigendum to “Wave Energy Potential and the Role of Extreme Events on South America's Coasts. A Regional Frequency Analysis” [Applied Ocean Research, Volumen 153, December 2024] “波浪能势和南美洲海岸极端事件的作用”的勘误表。区域频率分析”[应用海洋研究，vol . 153, December 2024]

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-12-01 DOI: 10.1016/j.apor.2024.104338

Valeria Mundaca-Moraga , Rodrigo Abarca-del-Rio

引用次数: 0

A novel leg design for reducing consolidation settlement of deeply embedded spudcan foundations in clayey seabed soils 一种减少海底粘土深埋桩基础固结沉降的新型桩腿设计

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-30 DOI: 10.1016/j.apor.2024.104335

Yu Ping Li , Jiang Tao Yi , Yong Fu , Khursheed Zeeshan , Yuntao Yuan

{"title":"A novel leg design for reducing consolidation settlement of deeply embedded spudcan foundations in clayey seabed soils","authors":"Yu Ping Li , Jiang Tao Yi , Yong Fu , Khursheed Zeeshan , Yuntao Yuan","doi":"10.1016/j.apor.2024.104335","DOIUrl":"10.1016/j.apor.2024.104335","url":null,"abstract":"<div><div>Field monitoring data has demonstrated excessive spudcan settlement during jack-up rig operation. However, there are no methods available for operators to reduce the consolidation settlement development. This paper presents a centrifuge and numerical model investigation aimed at reducing spudcan settlement. Initially, two centrifuge model tests were carried out to realistically replicate spudcan \"penetration-unloading-consolidation\" stages in an offshore field. The test results show that the spudcan consolidation settlement was partially reduced by the presence of an existing lattice leg extending from the top of spudcan footing. Based on this, it is suspected that a sleeve of a certain length extending from the top of the spudcan footing could be used to further reduce spudcan consolidation settlement. This work was accomplished by conducting small strain finite element analysis, the feasibility and reliability of the numerical model were first verified by comparing with centrifuge model test results. Subsequently, numerical models of spudcan installation and consolidation were conducted for both plain and sleeved-spudcan footings, under various soil strengths, operational loads, and embedment depths. Numerical results show that the top-mounted sleeve helped to prevent soil above the spudcan footing from moving downward, thereby reducing spudcan settlement. Based on the numerical results, an explicit equation assessing sleeved-spudcan consolidation settlement was established, as a function of sleeve area ratio and correlated well with that of a plain spudcan. This study provides a feasible and reliable numerical method for assessing spudcan consolidation settlement as well as an effective leg design to reduce settlement.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104335"},"PeriodicalIF":4.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An integrated system theoretic accident model and process (STAMP)-Bayesian network (BN) for safety analysis of water mist system on tanker ships 综合系统理论事故模型与过程(STAMP)-贝叶斯网络（BN）的油船水雾系统安全分析

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-30 DOI: 10.1016/j.apor.2024.104344

Bulut Ozan Ceylan , Sukru Ilke Sezer , Emre Akyuz

{"title":"An integrated system theoretic accident model and process (STAMP)-Bayesian network (BN) for safety analysis of water mist system on tanker ships","authors":"Bulut Ozan Ceylan , Sukru Ilke Sezer , Emre Akyuz","doi":"10.1016/j.apor.2024.104344","DOIUrl":"10.1016/j.apor.2024.104344","url":null,"abstract":"<div><div>A water mist on tanker ships is a specialized fire suppression system intended to mitigate fire hazards on board. This innovative safety measure disperses microscopic water droplets, creating a mist that rapidly absorbs heat and suppresses fires by reducing oxygen levels and cooling the surrounding area autonomously. This paper attempts to perform a comprehensive safety analysis of the water mist system on a tanker ship under the system theoretic accident model and process (STAMP) and Bayesian network (BN) robust modeling, which is capable of presenting a dynamic structure comprising complex elements. In the paper, whilst the STAMP is utilized to determine failure scenarios by establishing a hierarchical control and feedback model structure, the BN quantifies the probabilities of potential failures based on the outcomes of STAMP. A water mist system in tanker ships is analyzed under STAMP-BN modeling since it is an essential part of the ship, including an advanced system comprising elements of human, software, and hardware. The research results indicate that the failure probability of the water mist system has a failure probability of 3.93E-02. Besides its robust theoretical background, the research findings will provide a helpful reference for maritime safety managers, safety inspectors, technical inspectors, HSEQ managers, and ship crew on improving fire-fighting safety in tanker ships.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104344"},"PeriodicalIF":4.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study on 2:1 nonlinear parametric resonant responses of a Spar buoy in waves 波浪中桅杆浮标2:1非线性参数共振响应的数值研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-30 DOI: 10.1016/j.apor.2024.104345

Jingrui Zhao, Zhishuai Liu, Xiang Lin

{"title":"Numerical study on 2:1 nonlinear parametric resonant responses of a Spar buoy in waves","authors":"Jingrui Zhao, Zhishuai Liu, Xiang Lin","doi":"10.1016/j.apor.2024.104345","DOIUrl":"10.1016/j.apor.2024.104345","url":null,"abstract":"<div><div>This paper investigates the 2:1 parametric resonant behaviors of a Spar buoy in waves from the perspective of nonlinear dynamics. A coupled dynamic model of an experimental Spar buoy is established, incorporating its mooring system and nonlinear hydrostatic stiffness. The 2:1 parametric resonant behaviors of the Spar buoy are simulated in the time domain. To elucidate the mechanical mechanisms, the governing equation of pitch motion is simplified to a damped Mathieu-Duffing equation. The first-order analytical solution of the damped Mathieu-Duffing equation is derived using the perturbation method when the incident wave frequency approaches twice the pitch natural frequency of Spar buoys. A refined stability chart is generated in the parameter plane, alongside a time-efficient quantitative evaluation method for parametric resonant responses. The nonlinear pitch motions of the Spar buoy are predicted using this simplified approach and validated against the coupled dynamic model under both regular and irregular wave conditions, the bifurcation and jumping phenomenon are simulated. The findings indicate that high-order nonlinear stiffness can trigger a steady-state non-zero solution for the parametric resonant amplitude, leading to significant pitch motion during Mathieu instability. Furthermore, wave elevation can induce pitch motion resonance even when heave motion is non-resonant. The irregular waves can also excite a relatively moderate parametric resonance of pitch motion for the Spar buoy. This proposed methodology may assist designers in assessing parametric instability during the preliminary design stage for Spar buoys.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104345"},"PeriodicalIF":4.3,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical modeling of sediment dumping in deep water through a rock-fall pipe for subsea pipeline burial 海底管道埋置落石管深水输沙数值模拟

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-29 DOI: 10.1016/j.apor.2024.104328

Runyu Xie, Pengzhi Lin

{"title":"Numerical modeling of sediment dumping in deep water through a rock-fall pipe for subsea pipeline burial","authors":"Runyu Xie, Pengzhi Lin","doi":"10.1016/j.apor.2024.104328","DOIUrl":"10.1016/j.apor.2024.104328","url":null,"abstract":"<div><div>This paper presents a numerical study of sediment dumping in deep water through a rock-fall pipe for the burial of a subsea pipeline. A coupled CFD-DEM model is employed to model the interaction among sediments, ambient flow, pipeline, and seabed. Unlike sediment dumping in shallow water, in deep water sediment particles inside the rock-fall pipe may be accelerated to dangerous speed at the outlet and thus require a sufficient distance between the rock-pipe outlet and the subsea pipeline so that sediments can be slowed down before making impact on the subsea pipeline. The purpose of the study is to find the optimal distance of the fall pipe outlet above the subsea pipeline with different suspension heights above seabed. The numerical model is first validated against available experimental data in terms of flow and sediment simulations. It is then used to investigate the detailed hydrodynamic characteristics and particle motions during sediment dumping in deep water, which can be divided into particle acceleration inside the rock-fall pipe and particle deceleration and diffusion out of the rock-fall pipe. While insufficient distance of the rock-fall pipe outlet above the subsea pipeline may lead to excessive impact force, too large distance may result in over-spreading of sediments and thus less efficiency of subsequent pipeline burial. Using a real project in the Liwan 3-1 region, China, as the case study, the numerical modeling results with prototype scale are used in the analysis to provide the optimal burying solution that uses the minimal amount of sediment to reach the protection criterion of the pipeline burial, when different pipeline suspensions above seabed are considered.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104328"},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From hindcast to forecast: A statistical framework for real-time coastal circulation bulletins in the Gulf of Genoa 从后预报到预报：热那亚湾实时海岸环流公报的统计框架

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-29 DOI: 10.1016/j.apor.2024.104337

Mohammad Daliri , Francesco De Leo , Andrea Margarita Lira Loarca , Mattia Scovenna , Alessandro Stocchino , Marco Capello , Laura Cutroneo , Giovanni Besio

{"title":"From hindcast to forecast: A statistical framework for real-time coastal circulation bulletins in the Gulf of Genoa","authors":"Mohammad Daliri , Francesco De Leo , Andrea Margarita Lira Loarca , Mattia Scovenna , Alessandro Stocchino , Marco Capello , Laura Cutroneo , Giovanni Besio","doi":"10.1016/j.apor.2024.104337","DOIUrl":"10.1016/j.apor.2024.104337","url":null,"abstract":"<div><div>The increasing exploitation of coastal areas requires a detailed knowledge of environmental conditions that could be crucial for different applications, such as navigation safety and environmental protection. In this framework, this study introduces an offline forecast system for coastal circulation, being littoral currents among the main triggers of nearshore dynamics. The system utilizes clustering techniques for selecting relevant climatic scenarios based on historical metocean data, which are next used to simulate coastal circulation patterns through a robust modeling chain. The representative scenarios are then associated with meteocean forecast windows updated on a regular basis at the study area, <em>i.e</em>., the Gulf of Genoa in the Tyrrhenian Sea. Such operation takes advantage of tailored distance metrics, allowing to detect the closest scenario to the expected conditions, providing in turn real-time and refined predictions for coastal circulations. Such an offline approach ensures reliability, especially in coastal regions where accurate circulation forecasts are crucial for environmental management, marine navigation, and disaster preparedness.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104337"},"PeriodicalIF":4.3,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0