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Autonomous oil spill response through liquid neural trajectory modeling and coordinated marine robotics 基于液体神经轨迹建模和协调海洋机器人的自主溢油响应
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-19 DOI: 10.1016/j.apor.2026.104981
Hadas C. Kuzmenko, David Ehevich, Oren Gal
Marine oil spills pose grave environmental and economic risks, threatening marine ecosystems, coastlines, and dependent industries. Predicting and managing oil spill trajectories is highly complex, due to the interplay of physical, chemical, and environmental factors such as wind, currents, and temperature, which makes timely and effective response challenging. Accurate real-time trajectory forecasting and coordinated mitigation are vital for minimizing the impact of these disasters. This study introduces an integrated framework combining Liquid Time-Constant Networks (LTCNs) with multi-agent swarm robotics for real-time oil spill trajectory prediction and coordinated response. Our approach implements three complementary LTC solver variants optimized for different operational scenarios: RK4 for critical emergency response, Explicit for operational monitoring, and Euler for large-scale surveillance. The framework is validated using Deepwater Horizon satellite observations under moderate sea state conditions where Loop Current advection and wind forcing dominated transport. Results demonstrate superior spatial prediction accuracy (IoU 0.82-0.84), significantly surpassing Transformer (0.71) and LSTM (0.68) baselines. Crucially, the LTC model maintains realistic irregular boundary geometries (64+ vertices, complexity ratios 0.89-0.96) compared to oversimplified baseline predictions (5-12 vertices, complexity 0.48-0.61) that exhibit unrealistic circular approximations. The framework’s integration with MOOS-IvP enables autonomous fleet coordination, demonstrating scalable, fault-tolerant response capabilities. This work advances physics-based environmental prediction while providing operational flexibility through solver-specific deployment strategies.
海洋石油泄漏造成了严重的环境和经济风险,威胁着海洋生态系统、海岸线和依赖的工业。由于物理、化学和环境因素(如风、海流和温度)的相互作用,预测和管理溢油轨迹非常复杂,这使得及时有效的响应具有挑战性。准确的实时轨迹预测和协调的减灾对于尽量减少这些灾害的影响至关重要。本研究引入了一种将液体时间常数网络(LTCNs)与多智能体群机器人相结合的集成框架,用于实时溢油轨迹预测和协调响应。我们的方法实现了三种互补的LTC求解器变体,针对不同的操作场景进行了优化:RK4用于关键紧急响应,Explicit用于操作监控,Euler用于大规模监控。在环流平流和风强迫主导运输的中等海况条件下,使用深水地平线卫星观测对该框架进行了验证。结果表明,空间预测精度(IoU 0.82-0.84)明显优于Transformer(0.71)和LSTM(0.68)基线。至关重要的是,与过度简化的基线预测(5-12个顶点,复杂性0.48-0.61)相比,LTC模型保持了现实的不规则边界几何(64+顶点,复杂性比0.89-0.96),表现出不切实际的圆形近似值。该框架与MOOS-IvP的集成实现了自主车队协调,展示了可扩展的容错响应能力。这项工作推进了基于物理的环境预测,同时通过求解器特定的部署策略提供了操作灵活性。
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引用次数: 0
A note on the application of a time exponential integrator to fully nonlinear numerical wave tanks for engineering applications 时间指数积分器在全非线性数值波槽工程应用中的应用
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-18 DOI: 10.1016/j.apor.2026.104951
Yan Li
This work examines pseudospectral method-based theoretical frameworks for developing Numerical Wave Tanks (NWTs) which predict the spatiotemporal evolution of surface gravity–capillary waves. A special focus is on the numerical implementation. The frameworks are mathematically formulated by generalized and coupled parametric Partial Differential Equations (PDEs). Based on the PDEs, the matrix exponential are newly derived, permitting to explore the method of exponential integrator in developing NWTs using the theoretical frameworks which are reviewed in this work. An envelope-based theoretical framework is particularly newly derived, accurate to the third order in wave steepness. The resulting matrix exponential is validated through applying it in two different theoretical frameworks which are accurate to the first and second order in wave steepness. The exponential integrator method in predicting the phase-resolved evolving waves has a semi-analytical feature since it admits an analytical expression for linear waves propagation and developing approximate approaches for the evolution of nonlinear waves with quantified numerical errors. Hence, it permits a significantly improved numerical accuracy and thereby a wide applicability in engineering applications and physical systems with similar features.
这项工作研究了基于伪谱方法的理论框架,用于开发预测地表重力-毛细波时空演变的数值波槽(NWTs)。特别关注的是数值实现。该框架由广义和耦合参数偏微分方程(PDEs)在数学上表示。在偏微分方程的基础上,新导出了指数矩阵,从而可以利用本文综述的理论框架,探索指数积分法在发展NWTs中的应用。一个基于包络的理论框架是特别新导出的,精确到波陡的三阶。将所得的矩阵指数应用于两种不同的理论框架中进行验证,这两种理论框架在波陡度上分别精确到一阶和二阶。指数积分法预测相分辨波的演化具有半解析的特点,因为它允许线性波传播的解析表达式,并为具有量化数值误差的非线性波的演化提供近似方法。因此,它可以显著提高数值精度,从而在工程应用和具有类似特征的物理系统中具有广泛的适用性。
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引用次数: 0
Experimental investigation into the roll damping characteristics of the intact and damaged ship in still water and ice floes 静水和浮冰条件下完整和破损船舶横摇阻尼特性的实验研究
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-15 DOI: 10.1016/j.apor.2026.104975
XinLong Zhang , ZhuoYuan Li , Simone Mancini , QingYi Qu , RenQing Zhu
Ships face potential risks of damage from navigation environments and human factors. The multiphase flow of ship-water-ice particularly increases the difficulty of evaluating the roll damping characteristics of a damaged ship in ice floes. To better analyze effects brought by different factors, five test scenarios with initial heeling angle of 6.0, 13.0 and 21.0 deg are performed in this paper, including the intact ship and damaged ship in the still water and ice floes. Experimental results indicate that regardless of the intact ship or the damaged ship, effects of ice floes on the roll damping of the ship can be ignored. However, effects of flooding water and the ventilation level of the flooded compartments must be considered. Especially for the flooding water, the nonlinear damping coefficients of the damaged ship are increased by approximately one order of magnitude compared to the intact ship. In general, the test results can not only be used for the current qualitative analysis of roll damping but also serve as benchmarking data for future verification of numerical reliability.
船舶面临着航行环境和人为因素的潜在损害风险。船-水-冰的多相流尤其增加了评估浮冰中受损船舶横摇阻尼特性的难度。为了更好地分析不同因素带来的影响,本文进行了初始倾侧角分别为6.0、13.0和21.0°的5种试验场景,包括完好船舶和受损船舶在静水中和浮冰中的试验。实验结果表明,无论是完好船舶还是受损船舶,浮冰对船舶横摇阻尼的影响可以忽略不计。但是,必须考虑淹水的影响和淹水舱室的通风水平。特别是在洪水作用下,受损船舶的非线性阻尼系数比完好船舶提高了约一个数量级。总体而言,试验结果既可用于当前横摇阻尼的定性分析,也可作为未来数值可靠性验证的基准数据。
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引用次数: 0
Definitions and characteristics of loading patterns on single and shared marine anchors for floating offshore wind turbines 海上浮式风力涡轮机单锚和共用锚载荷模式的定义和特征
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-23 DOI: 10.1016/j.apor.2026.104980
D.J. White, B. Cerfontaine, A. Rashidi Mehrabadi, S. Gourvenec
The growth of floating offshore wind has prompted new attention on the behaviour of anchors, including the concept of anchor sharing among multiple mooring lines. A critical design interface is between the mooring line loads and the geotechnical design. Typically ten to a hundred design loading conditions must be rationalised into the critical contributions that govern the geotechnical response of the anchor.
This paper provides a framework to bridge between the mooring system analysis and the geotechnical design. Firstly, a methodology to translate a general time history of anchor loading into a characteristic ‘fingerprint’ is set out. This fingerprint has three components – (i) a ‘heatmap’ defining the normalised distribution of the cyclic loading across the three spherical dimensions of the resultant load, (ii) a vector of the relative cyclic frequency in these directions, and (iii) two scalar quantities required to unpack these normalised parameters to recover the original time series characteristics.
Secondly, measures of similarity are defined, that allow two fingerprints to be quantitatively compared. This provides a new measure to compare the idealised patterns of loading used in model testing, field testing or laboratory element tests with the more complex patterns that are found in real data of anchor loading or from numerical simulations of floating systems. The framework is illustrated by demonstrating the varying similarity evident between example mooring line loads and the common loading patterns applied in geotechnical testing.
In summary, this new framework allows anchor loading histories to be distilled into simple fingerprints and similarity measures, providing to tool to accelerate identification of critical design cases and allow more efficient idealisation for geotechnical modelling and design.
海上浮式风的发展引起了人们对锚的新关注,包括多条系泊线共享锚的概念。系泊线载荷与岩土工程设计之间存在着一个关键的设计界面。通常,必须将10到100种设计加载条件合理化为控制锚杆岩土响应的关键贡献。本文为系泊系统分析与岩土工程设计之间的桥梁提供了一个框架。首先,提出了一种将锚载荷的一般时间历史转换为特征“指纹”的方法。这个指纹有三个组成部分——(i)一个“热图”,定义了循环载荷在合成载荷的三个球面尺寸上的归一化分布,(ii)这些方向上的相对循环频率向量,以及(iii)两个标量,需要解开这些归一化参数以恢复原始时间序列特征。其次,定义相似性度量,使两个指纹可以进行定量比较。这提供了一种新的方法,将模型试验、现场试验或实验室元件试验中使用的理想加载模式与锚加载的实际数据或浮动系统的数值模拟中发现的更复杂的模式进行比较。该框架通过演示示例系泊线荷载与岩土工程试验中应用的常见荷载模式之间明显的不同相似性来说明。总之,这个新框架可以将锚载荷历史提取为简单的指纹和相似性度量,提供了加速识别关键设计案例的工具,并允许更有效的岩土建模和设计理想化。
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引用次数: 0
Flapping-foil energy harvesters: Principles, performance, and prospects 扑翼式能量收集器:原理、性能和前景
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-06 DOI: 10.1016/j.apor.2026.104953
Maqusud Alam , Bubryur Kim , Farzeen Shahid
Flapping-foil energy harvesters (FFEHs) are garnering attention as a promising alternative to conventional rotary turbines. This comprehensive review synthesises four decades of research, highlighting that power extraction is primarily governed by vortex dynamics (leading-edge-vortex formation and wake capture), which are influenced by the foil’s kinematics, geometry, flexibility and control. The reported peak hydrodynamic efficiencies are substantial: ≈40% for prescribed-motion systems, exceeding 50% for flexible or actively cambered foils. Efficiencies can be further enhanced using multi-foil arrays, ducted configurations, and tandem layouts, reaching up to 64%. However, most existing studies remain confined to two-dimensional or low-Reynolds-number regimes, limiting confidence in scaling these results for real-world deployment. Key challenges remain in stabilising complex three-dimensional wakes, developing practical power-take-off systems, and ensuring robust control in turbulent and shear flow conditions. Emerging strategies such as machine-learning-assisted optimisation, reinforcement-learning controllers, and hybrid activation concepts are also promising. Ultimately, advances in high-Reynolds-number fluid–structure interaction and data-driven control will be crucial in transitioning FFEH technology from laboratory prototypes to reliable, commercially viable renewable-energy solutions.
扑翼能量收集器(FFEHs)作为传统旋转涡轮机的一种很有前途的替代品而备受关注。这篇全面的综述综合了四十年的研究,强调了动力提取主要是由涡流动力学(前缘涡形成和尾迹捕获)控制的,这受箔的运动学、几何形状、灵活性和控制的影响。报道的峰值流体动力效率是可观的:对于规定运动系统≈40%,对于柔性或主动弯曲箔超过50%。采用多箔阵列、导管配置和串联布局可以进一步提高效率,最高可达64%。然而,大多数现有的研究仍然局限于二维或低雷诺数,限制了将这些结果扩展到现实世界部署的信心。关键的挑战仍然是稳定复杂的三维尾迹,开发实用的动力输出系统,以及确保在湍流和剪切流条件下的鲁棒控制。机器学习辅助优化、强化学习控制器和混合激活概念等新兴策略也很有前景。最终,高雷诺数流固耦合和数据驱动控制技术的进步将是FFEH技术从实验室原型向可靠、商业上可行的可再生能源解决方案转变的关键。
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引用次数: 0
Ship trajectory prediction method based on heterogeneous spatiotemporal graph neural networks 基于异构时空图神经网络的船舶轨迹预测方法
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-10 DOI: 10.1016/j.apor.2026.104969
Yanyun Yu , Zelin Song , Hongshuo Zhang , Dechen Liu , Lixing Li , Bin Xie
With the rapid growth of maritime transportation, ensuring navigational safety has become increasingly important. Accurate trajectory prediction is vital in understanding ships' future intentions and supporting safe navigation. In recent years, many researchers have explored ship-to-ship interactions to improve prediction accuracy. However, real-world maritime interactions are often complex and diverse. We propose a ship Trajectory Prediction Model Based on a Heterogeneous Spatiotemporal Graph Neural Network to address this. The model effectively captures diverse social interactions among vessels by heterogeneous graph structures. A Dual-Axis Attention Aggregation (DAA) mechanism is introduced to accurately capture spatial interaction features, while the iTransformer is employed to extract long-term dependencies from trajectory sequences. We evaluate our method on three real-world AIS datasets, comparing it with several state-of-the-art baselines. Experimental results show that our model achieves the highest prediction accuracy in short-term, mid-term, and long-term scenarios while maintaining robustness, efficiency, and practicality even when predicting multi-vessel trajectories in congested and complex maritime environments.
随着海上运输的快速发展,确保航行安全变得越来越重要。准确的轨迹预测对于了解船舶未来意图和支持安全航行至关重要。近年来,许多研究人员探索了船对船的相互作用,以提高预测精度。然而,现实世界的海上互动往往是复杂和多样的。针对这一问题,提出了一种基于异构时空图神经网络的船舶轨迹预测模型。该模型通过异构图结构有效地捕获了容器之间的各种社会互动。采用双轴注意力聚合(Dual-Axis Attention Aggregation, DAA)机制准确捕捉空间交互特征,利用ittransformer提取轨迹序列的长期依赖关系。我们在三个真实的AIS数据集上评估了我们的方法,并将其与几个最先进的基线进行了比较。实验结果表明,即使在拥挤和复杂的海洋环境中预测多船轨迹,我们的模型在短期、中期和长期场景下也能达到最高的预测精度,同时保持鲁棒性、效率和实用性。
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引用次数: 0
Mitigating Roll Response of High-Speed Catamarans by dual demihull mounted T-Foils, Part 2: Closed-Loop Tests in Regular Waves 用双半船壳安装t型翼减轻高速双体船的侧倾响应,第2部分:规则波浪中的闭环试验
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-25 DOI: 10.1016/j.apor.2026.104987
Ehsan Javanmard , Javad A. Mehr , Michael R. Davis , Damien S Holloway , Jason Ali-Lavroff
Building on open-loop calm water investigations presented in Part 1, this study advances to closed-loop towing tank experiments to evaluate the effectiveness of a new RCS configuration, featuring dual demihull-mounted T-Foils and transom-mounted stern tabs, in reducing roll response. A roll control algorithm was developed to actively deflect the T-Foils and stern tabs based on real-time roll response feedback. Experiments were conducted at a model speed of 2.89 m/s (37 knots full scale) in Regular Waves with height of 60 mm and 90 mm (2.7 m and 4 m full scale), using a 2.5 m catamaran model towed at a 2° drift angle with bow to port to induce roll motion in encountered waves. The RCS was tested in three conditions: No RCS, passive RCS, and active RCS with linear and nonlinear roll control algorithms. The nonlinear roll control algorithm was most effective, reducing peak roll response by 58% in moderate waves and 43% in large waves. Overall, the new RCS mitigated roll, pitch, and heave motions in moderate waves by 58%, 34%, and 25%, respectively, demonstrating the potential of demihull-mounted T-Foils to enhance roll control while maintaining heave and pitch motion control effectiveness. Local vertical motion analysis showed the highest motion response at the bow-starboard and the lowest at the midship-port location, highlighting the influence of wave impact, drift-induced asymmetry, and combined motions. The results of this study offer valuable guidance for future RCS design in high-speed vessels.
在第1部分中介绍的开环静水试验的基础上,本研究推进到闭环拖曳舱实验,以评估一种新型RCS配置的有效性,该配置具有双半船壳安装t型箔片和艉轴安装标签,以减少侧倾响应。提出了一种基于实时横摇响应反馈的t型翼元和尾板主动偏转横摇控制算法。实验以模型速度2.89 m/s(37节满尺)在高为60 mm和90 mm (2.7 m和4 m满尺)的规则波浪中进行,使用2.5 m双体船模型,以2°漂移角拖曳,艏向左舷,以诱导遇到波浪的横摇运动。采用线性和非线性滚转控制算法,在无RCS、被动RCS和主动RCS三种情况下对RCS进行了测试。非线性横摇控制算法是最有效的,在中等波浪中横摇峰值响应降低58%,在大波浪中降低43%。总的来说,新的RCS在中等波浪中分别减轻了58%、34%和25%的横摇、俯仰和升沉运动,这表明半船体安装的t型翼在增强横摇控制的同时保持了纵摇和俯仰运动控制的有效性。局部垂直运动分析显示,船首-右舷位置运动响应最高,船中-左舷位置运动响应最低,波浪冲击、漂移不对称和联合运动的影响较为突出。研究结果为今后高速船舶RCS的设计提供了有价值的指导。
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引用次数: 0
Integrated system-level framework for inspection and cost-effective maintenance of jacket type offshore platforms using dynamic Bayesian networks 基于动态贝叶斯网络的导管架型海上平台检测与经济维护集成系统级框架
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-18 DOI: 10.1016/j.apor.2026.104979
Behrouz Asgarian, Mohammad Javad Bahman Bilandi, Pooya Rezadoost, Hossein Gholami
This study presents a system-level framework for inspection and maintenance planning of offshore jacket structures subjected to fatigue deterioration. The framework integrates fracture mechanics–based crack growth models with Dynamic Bayesian Networks (DBNs) to probabilistically update structural states as inspection information becomes available, and it employs influence diagrams with heuristic optimization to identify cost-efficient inspection and repair strategies. The approach captures both component- and system-level deterioration, accounts for inspection outcomes in real time, and evaluates life-cycle costs by jointly considering inspection, repair, and failure consequences. Results highlight that purely periodic inspections may reduce cost but risk compromising reliability, whereas hybrid strategies that combine periodic scheduling with reliability-based triggers provide a more balanced and robust outcome. The framework is computationally efficient, scalable to large jackets with many joints, and adaptable to diverse deterioration scenarios. In practice, it provides a decision-support tool for asset managers and regulators to design inspection programs that balance safety, reliability, and economic efficiency, ensuring the long-term fitness for purpose of offshore infrastructure.
本研究提出了一个系统级框架,用于海上导管架结构疲劳退化的检查和维修计划。该框架将基于断裂力学的裂纹扩展模型与动态贝叶斯网络(dbn)相结合,在检测信息可用时以概率方式更新结构状态,并采用启发式优化的影响图来确定具有成本效益的检测和修复策略。该方法捕获组件和系统级的劣化,实时计算检查结果,并通过联合考虑检查、修理和故障后果来评估生命周期成本。研究结果强调,纯粹的定期检查可能会降低成本,但会降低可靠性,而将定期调度与基于可靠性的触发器相结合的混合策略提供了更加平衡和稳健的结果。该框架计算效率高,可扩展到具有许多关节的大型夹克,并适应各种恶化情况。在实践中,它为资产管理公司和监管机构提供了决策支持工具,以设计平衡安全性、可靠性和经济效率的检查方案,确保海上基础设施的长期适用性。
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引用次数: 0
Optimized time increments for stress time series in the substructure of a floating offshore wind turbine using a hybrid frequency–time domain approach 采用混合频域法对海上浮式风力机子结构的应力时间序列进行了时间增量优化
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI: 10.1016/j.apor.2026.104961
Joonmo Choung , Sungjun Park
This study proposes an efficient hybrid frequency–time domain approach to reconstruct stress time series in the substructure of a floating offshore wind turbine (FOWT). The proposed framework combines hydrodynamic pressure response amplitude operators (RAOs) obtained from Wamit with concentrated load histories—accelerations, tower-base forces, and fairlead tensions—derived from OpenFAST. Unit stress RAOs were computed using linear static finite element analyses (FEAs) in Abaqus and linearly superposed to generate total stress histories. The hybrid approach was validated against transient dynamic FEAs through a simplified cantilever-beam model, demonstrating excellent agreement except for slight discrepancies attributed to dynamic amplification effects that are inherently captured only in transient dynamic FEAs. The proposed framework was subsequently applied to the VolturnUS-S 15 MW reference FOWT. Hydrodynamic analyses were performed in the frequency domain using Wamit, while fully coupled aero-hydro-servo-elastic simulations were conducted in the time domain using OpenFAST under two design load cases (DLC6.1 for ultimate limit state and DLC1.2 for fatigue limit state). The hybrid method successfully reconstructed stress time series in the substructure by combining the frequency-domain pressure RAOs with the time-domain load histories. A parametric study was conducted to determine an optimal time increment for stress reconstruction. Increasing the time increment for stress reconstruction significantly reduced computational time and storage requirements while moderately influencing stress accuracy. When the time increment for stress reconstruction is 0.1 s, the maximum stress deviation in the ultimate limit state was <5 %, and the cumulative fatigue damage deviation in the fatigue limit state was <2.3 %, compared with reference results obtained at the time increment for stress reconstruction of 0.0125 s. These findings demonstrate that the proposed hybrid approach can maintain sufficient accuracy while reducing computational cost and data volume by over 90 %. Future work should extend this methodology to a broader range of environmental conditions and additional DLCs to validate its general applicability.
提出了一种有效的频率-时域混合方法来重建海上浮式风力发电机子结构的应力时间序列。该框架将从Wamit获得的水动压力响应振幅算子(RAOs)与OpenFAST获得的集中负载历史(加速度、塔基力和导联张力)相结合。在Abaqus中使用线性静态有限元分析(FEAs)计算单元应力RAOs,并进行线性叠加得到总应力史。通过简化的悬臂梁模型对混合方法进行了瞬态动态有限元验证,除了在瞬态动态有限元中固有地捕获的动态放大效应引起的轻微差异外,显示出极好的一致性。提议的框架随后应用于VolturnUS-S 15兆瓦参考FOWT。采用Wamit软件在频域进行流体动力分析,采用OpenFAST软件在时域进行气动-液压-伺服-弹性全耦合仿真,分别在两种设计载荷工况下(极限状态为DLC6.1,疲劳极限状态为DLC1.2)。该混合方法将频域压力曲线与时域载荷历史曲线相结合,成功地重构了子结构的应力时间序列。为确定应力重建的最佳时间增量,进行了参数化研究。增加应力重建的时间增量可显著减少计算时间和存储需求,同时适度影响应力精度。与应力重建时间增量为0.0125 s的参考结果相比,应力重建时间增量为0.1 s时,极限状态下的最大应力偏差为5%,疲劳极限状态下的累积疲劳损伤偏差为2.3%。这些研究结果表明,所提出的混合方法可以在保持足够精度的同时减少90%以上的计算成本和数据量。未来的工作应该将这种方法扩展到更广泛的环境条件和额外的dlc,以验证其普遍适用性。
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引用次数: 0
Spatial-temporal evolution and damage mechanism of pore-throat networks in unconsolidated sandstones during seawater reinjection based on in-situ CT 基于原位CT的海水回注松散砂岩孔喉网络时空演化及损伤机制
IF 4.4 2区 工程技术 Q1 ENGINEERING, OCEAN Pub Date : 2026-03-01 Epub Date: 2026-02-17 DOI: 10.1016/j.apor.2026.104982
Huiyong Zeng , Lifeng Chen , Yongqing Bai , Zhaonian Zhang , Minghao Xue , Lu Lai , Tengfei Wang
Seawater is widely used as an injection fluid in offshore subsurface systems because of its stable availability and low operational cost. However, direct pore-scale evidence of structural evolution and seepage degradation in unconsolidated sandstones during seawater reinjection remains limited under conditions representative of offshore operations. In this study, pore-scale structural evolution and seepage response of unconsolidated sandstone cores from the Bohai Sea were investigated using in-situ X-ray computed tomography, combined with three-dimensional pore network reconstruction and pore-scale flow simulation. The results show that seawater reinjection induces a staged and non-monotonic evolution of pore structure and permeability. During the early injection stage, clay swelling and fine-particle migration dominate pore–throat blockage, leading to pronounced loss of connectivity and rapid permeability decline. With continued injection, partial pore reopening occurs under hydrodynamic erosion, and porosity shows limited recovery. Nevertheless, permeability remains strongly constrained due to irreversible alteration of pore topology. Marked spatial heterogeneity is observed along the flow direction, with particle accumulation concentrated near the injection end and clay-related pore collapse more evident in downstream regions. Grey relational analysis indicates that pore topology exerts a stronger control on permeability evolution than clay content alone, highlighting the key role of connectivity degradation in sustained seepage impairment. These findings provide pore-scale insight into injectivity deterioration during offshore seawater injection and offer a microstructural basis for interpreting injection performance in offshore subsurface engineering.
由于其稳定的可用性和较低的运营成本,海水被广泛用作海上地下系统的注入液。然而,在具有代表性的海上作业条件下,在海水回注过程中松散砂岩结构演化和渗流退化的直接孔隙尺度证据仍然有限。采用原位x射线计算机断层扫描技术,结合三维孔隙网络重建和孔隙尺度流动模拟,研究了渤海地区松散砂岩岩心孔隙尺度结构演化与渗流响应。结果表明,海水回注引起了孔隙结构和渗透率的阶段性非单调演化。在注入初期,粘土膨胀和细颗粒运移主导了孔喉堵塞,导致连通性明显丧失,渗透率迅速下降。随着持续注入,在水动力侵蚀作用下,孔隙发生部分重新开放,孔隙度恢复有限。然而,由于孔隙拓扑结构的不可逆改变,渗透率仍然受到强烈的限制。沿流动方向存在明显的空间异质性,颗粒堆积集中在注入端附近,下游区域粘土相关孔隙崩塌更为明显。灰色关联分析表明,孔隙拓扑结构对渗透率演化的控制作用强于粘土含量,这凸显了连通性退化在持续渗流损害中的关键作用。这些发现为海上海水注入过程中注入能力的恶化提供了孔隙尺度的洞察,并为解释海上地下工程中的注入性能提供了微观结构基础。
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Applied Ocean Research
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