Applied Ocean Research最新文献

Evaluation of wave-induced flow through marine porous media accounting for transition of seepage properties across multiple flow regimes

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]

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

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

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

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

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

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

Real scale experiments on the wave-induced burial and mobilization of Unexploded Ordnance on the seafloor

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-28 DOI: 10.1016/j.apor.2024.104342

Peter Menzel , Guido Wolters , Anja Drews

{"title":"Real scale experiments on the wave-induced burial and mobilization of Unexploded Ordnance on the seafloor","authors":"Peter Menzel , Guido Wolters , Anja Drews","doi":"10.1016/j.apor.2024.104342","DOIUrl":"10.1016/j.apor.2024.104342","url":null,"abstract":"<div><div>As a result of armed conflicts, huge amounts of Unexploded Ordnance devices (UXO) and Discarded Munition Material (DMM) are expected to be located on the seafloor, especially in coastal regions. During Offshore Construction, strategical site monitoring and systematic remediation activities, the behaviour of such objects in waves and currents is of huge interest as potential mobilization of objects after a survey or clearance activity could change the situational picture again. From findings and reports it often is assumed that UXO and DMM tend to migrate over the seafloor for long distances. Here, anthropogenic effects like fishing or dredging activities are underestimated. More scientific approaches clearly show that mobilization and migration of UXO over long distances does not occur. However, theoretical analysis remain theories until they are proven by experiments. For this reason, three large representative objects were investigated under real scale wave conditions in the Delta Flume of Deltares. The objects represent real scale models of UXO found in the North Sea as well as academically shaped objects. All objects as well as the Flume Tank were intensively instrumented to measure the full environmental conditions as well as the behaviour of the objects. The sediment represents typical sand as found in the North Sea and the seabed morphology and soil conditions were closely monitored during the experiments. The experiments support the theoretical models that predict burial but no mobilization also under extreme wave conditions.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104342"},"PeriodicalIF":4.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743399","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

Motion characteristics of sphere with uniaxial through-hole after passing through air–water interface: Case study with different submergence depths

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-28 DOI: 10.1016/j.apor.2024.104341

K. Takamure , T. Uchiyama , T. Degawa

{"title":"Motion characteristics of sphere with uniaxial through-hole after passing through air–water interface: Case study with different submergence depths","authors":"K. Takamure , T. Uchiyama , T. Degawa","doi":"10.1016/j.apor.2024.104341","DOIUrl":"10.1016/j.apor.2024.104341","url":null,"abstract":"<div><div>A vented sphere with a density of 2.6 × 10<sup>3</sup> kg/m<sup>3</sup> and a diameter of 25.4 mm containing a circular uniaxial through-hole (diameter: 6 mm) was launched vertically upward from stationary water toward the air–water interface. The launch speed was adjusted such that the Reynolds number of the sphere was approximately 3000 immediately after it passed through the air–water interface. The effects of varying the submergence depth on the motion of the vented motion and behavior of the air–water interface were investigated. The entrained water mass increased with the submergence depth, resulting in an increase in the kinetic energy loss of the vented sphere. As the submergence depth increased, the vented sphere rotated as it passed through the air–water interface, and a sheet-like water mass was formed parallel to the direction of the through-hole. The vented sphere moved in the direction opposite to the scattering of the water mass. The vented sphere lost more kinetic energy compared to a normal sphere (without through-holes) while passing through the air–water interface at the same Reynolds number. These results indicated that the presence of the through-hole affected the motion characteristics of the sphere and behavior of the entrained water mass. These findings provide useful information for effectively controlling the attitude of artificial swimming devices that pass-through air–water interfaces.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104341"},"PeriodicalIF":4.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743395","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

Hydrodynamic response of a submerged elliptic disc to surface water waves

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-28 DOI: 10.1016/j.apor.2024.104327

Ajijul Hoque , Leandro Farina , Ranadev Datta , R. Gayen

{"title":"Hydrodynamic response of a submerged elliptic disc to surface water waves","authors":"Ajijul Hoque , Leandro Farina , Ranadev Datta , R. Gayen","doi":"10.1016/j.apor.2024.104327","DOIUrl":"10.1016/j.apor.2024.104327","url":null,"abstract":"<div><div>The impact of an elliptic disc submerged in water of infinite depth on radiation and scattering phenomena is analyzed employing linear water wave theory. The problem is tackled by reducing it into two-dimensional hypersingular integral equations over the surface of the disc. Utilizing a spectral method, where the hypersingularity is evaluated analytically, we obtain numerical solutions for the integral equations. This study presents numerical findings concerning various hydrodynamic parameters relevant to disc scattering and radiation. Initially it compares numerical outcomes with those of a circular disc, before conducting a comprehensive parametric investigation for the elliptic disc. The primary focus is on investigating how the submerged depth and the geometry of the disc impact physical quantities such as added mass, damping coefficient, surface elevation, differential cross-section, and exciting forces. The results reveal a noticeable change in the pressure field around the disc as it approaches the free surface, leading to resonance. Due to the geometry of the submerged rigid elliptic disc, notable alterations in wave profile are noted in the results for both radiation and scattering problems. Furthermore, the radiation problem results reveal significant variations in the added mass and the damping coefficient for non-circular bodies, particularly with a high ratio of the semi-major axis to the semi-minor axis. Overall, this investigation provides a significant benchmark and valuable insights into potential applications in ocean energy and indicates a new design idea of an elliptic base oscillator alongside the commonly used circular designs.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104327"},"PeriodicalIF":4.3,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142743397","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