Applied Ocean Research最新文献

Toward an AI-enhanced hydro-morphodynamic model for nature-based solutions in coastal erosion mitigation 建立人工智能增强型水文形态动力学模型，为减缓海岸侵蚀提供基于自然的解决方案

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-17 DOI: 10.1016/j.apor.2024.104326

Nour Dammak, Wei Chen, Joanna Staneva

{"title":"Toward an AI-enhanced hydro-morphodynamic model for nature-based solutions in coastal erosion mitigation","authors":"Nour Dammak, Wei Chen, Joanna Staneva","doi":"10.1016/j.apor.2024.104326","DOIUrl":"10.1016/j.apor.2024.104326","url":null,"abstract":"<div><div>In the application of sustainable Nature-based Solution (NbS) for coastal engineering, a significant challenge lies in determining the effectiveness of these NbS approaches in mitigating coastal erosion. The efficacy of NbS is influenced by various factors, including the specific location, layout, and the scale of implementation. This study integrates artificial intelligence (AI) with hydro-morphodynamic numerical simulations to develop an AI-based emulator focused on predicting Bed Level Changes (BLC) as indicators of erosion and deposition dynamics. Specifically, we explore the influence of seagrass meadows, varying in starting depth (hs) and depth range (hr), on coastal erosion mitigation during storm events.</div><div>The framework leverages a hybrid approach combining the SCHISM-WWM hydrodynamic model with XBeach for simulating 180 depth range and starting depth combination (h<sub>r</sub>-h<sub>s</sub>) scenarios along the Norderney coast in the German Bight. A Convolutional Neural Network (CNN) architecture is employed with dual inputs—roller energy and Eulerian velocity—to predict BLC efficiently. The CNN demonstrates high accuracy in replicating spatial erosion patterns and quantifying erosion volumes, achieving an RMSE of 3.47 cm and an R² of 0.94 during validation.</div><div>This innovative integration of AI and NbS not only reduces computational costs associated with traditional numerical modelling but also enhances the feasibility of What-if Scenarios applications for coastal erosion management. The findings underscore the potential of AI-driven approaches to optimize seagrass transplantation layouts and inform sustainable coastal protection strategies effectively. Future advancements aim to further streamline model integration and scalability, thereby advancing NbS applications in enhancing coastal resilience against environmental stressors.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104326"},"PeriodicalIF":4.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656156","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

Development of Spatial Clustering Method and Probabilistic Prediction Model for Maritime Accidents 海上事故空间聚类方法和概率预测模型的开发

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-16 DOI: 10.1016/j.apor.2024.104317

Cheol-Won Choe , Suhwan Lim , Dong Jun Kim , Ho-Chul Park

{"title":"Development of Spatial Clustering Method and Probabilistic Prediction Model for Maritime Accidents","authors":"Cheol-Won Choe , Suhwan Lim , Dong Jun Kim , Ho-Chul Park","doi":"10.1016/j.apor.2024.104317","DOIUrl":"10.1016/j.apor.2024.104317","url":null,"abstract":"<div><div>Maritime accidents are complex incidents characterized by the absence of physically defined routes, unlike roads, and influenced by various factors such as marine conditions, vessel status, and multiple contributing factors. Despite efforts to reduce maritime accidents in Republic of Korea, the number of accident occurrences remains at a high level. Moreover, the infrequency of severe accidents makes it difficult to gather sufficient data for comprehensive analysis. This study aims to construct and validate a maritime accident prediction model to protect life and property in the event of accidents, considering the characteristics of the ocean, where tracking and managing transportation means is challenging. For the first step of predicting maritime accidents, a 5-level spatial system was constructed based on the density of accidents and vessel traffic. The data to be used in the analysis was constructed through four steps. In order to evaluate the maritime accident prediction model, we conducted a comparative analysis with the machine learning-based ANN model using a Confusion matrix. Cost-of-omission analyses were conducted based on vessel traffic volume and environmental factors according to the seasons to examine the influence of variables on the probability of maritime accidents. Based on this, implications are presented through an analysis of the causes of maritime accidents according to their factors.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104317"},"PeriodicalIF":4.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656155","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}

引用次数: 0

Investigation on dynamic response of J-tube submarine cable around monopile foundation 单桩基础周围 J 型管海底电缆动态响应研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-16 DOI: 10.1016/j.apor.2024.104319

Peiyuan Zhou , Yangyang Gao , Lizhong Wang , Lingling Li

引用次数: 0

Active control of vibration and radiated noise in the shaft-shell coupled system of an underwater vehicle 主动控制水下航行器轴壳耦合系统的振动和辐射噪声

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-16 DOI: 10.1016/j.apor.2024.104324

Yaqi Tian , Cong Zhang , Lei Yang

{"title":"Active control of vibration and radiated noise in the shaft-shell coupled system of an underwater vehicle","authors":"Yaqi Tian , Cong Zhang , Lei Yang","doi":"10.1016/j.apor.2024.104324","DOIUrl":"10.1016/j.apor.2024.104324","url":null,"abstract":"<div><div>Active control is effective in reducing the low-frequency vibration and acoustic radiation of the stern system of an underwater vehicle. This paper theoretically investigates the reduction of vibration and far-field radiation noise in the stern system of an underwater vehicle arising from propeller bearing forces and surface force excitations. Based on the Flügge theory and Euler–Bernoulli theory, an analytical dynamic model of the shaft-shell system is established. The effectiveness of the analytical model is verified through finite element and boundary element methods. The impact of actuator placement, error signal selection, and control strategies on the effectiveness of active control is discussed. A combined active control scheme for the shaft-shell system, involving electromagnetic actuators installed on both the shaft and the shell, is proposed. This scheme effectively controls shaft vibration, shell vibration, and far-field acoustic radiation simultaneously. The theoretical model established in this paper can be used as a reference for low-frequency vibration control of an underwater vehicle.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104324"},"PeriodicalIF":4.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656217","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}

引用次数: 0

Experimental observation on violent sloshing flows inside rectangular tank with flexible baffles 带柔性挡板的矩形水槽内剧烈荡流的实验观测

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-14 DOI: 10.1016/j.apor.2024.104307

Taehyun Park , Cheon-Jin Park , Jeoungkyu Lee , Yonghwan Kim

{"title":"Experimental observation on violent sloshing flows inside rectangular tank with flexible baffles","authors":"Taehyun Park , Cheon-Jin Park , Jeoungkyu Lee , Yonghwan Kim","doi":"10.1016/j.apor.2024.104307","DOIUrl":"10.1016/j.apor.2024.104307","url":null,"abstract":"<div><div>In this study, a series of sloshing model tests were conducted to observe the effects of an internal baffle in a rectangular tank and to secure basic data for future numerical calculations or applications to similar phenomena.</div><div>The sloshing flows and flexible motions of two different baffles with hyper-elastic properties were observed and the results were compared with those of a non-flexible baffle. Experiments were conducted for different filling conditions, motion amplitudes, and excitation frequencies, with a particular focus on violent flow cases. The local flows around the baffles were captured using a high-speed camera, and the sloshing-induced impact pressures on the tank walls were measured. The present experiment showed strong interactions between flexible baffle motion and sloshing flows, particularly at motion frequencies higher than the natural sloshing frequency. The physical phenomena became more complicated when the free surface was closer to the baffle height. The data obtained in this study can be used as benchmark tests for numerical computation of strong-fluid interactions.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104307"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656212","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

Study on critical condition of damage mode of local grillage structure under near-field underwater explosion 近场水下爆炸下局部格栅结构破坏模式临界状态研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-14 DOI: 10.1016/j.apor.2024.104313

Kun Zhao , Dongyan Shi , Zhikai Wang , Yanpei Zhou , Yonghui Liang

{"title":"Study on critical condition of damage mode of local grillage structure under near-field underwater explosion","authors":"Kun Zhao , Dongyan Shi , Zhikai Wang , Yanpei Zhou , Yonghui Liang","doi":"10.1016/j.apor.2024.104313","DOIUrl":"10.1016/j.apor.2024.104313","url":null,"abstract":"<div><div>The rapid prediction of damage to underwater explosion-damaged ship plate structures is a crucial element in the assessment of ship impact damage. In this paper, we address the challenge of rapidly predicting the damage mode of plate and frame structures subjected to underwater explosions. We begin by establishing that the shock wave load of an underwater explosion can be modeled as a rectangular pulse, based on the effective impulse of action and the characteristics of the target structure. We then delve into the mechanical criteria governing the different damage modes, employing the equivalent theory of plate and frame. The critical condition of the dimensionless damage mode of the local plate and frame structure of the ship is deduced by the dimensional analysis method based on the mechanical criterion of damage mode. In this paper, an integrated approach combining experimental and numerical research methods is employed. Firstly, an analysis of the damage modes of the light plate structure is conducted. The experimental data, numerical data, and theoretical calculation data based on the critical discriminant condition of the dimensionless damage mode are compared. The accuracy and reliability of the numerical method and the critical discriminant condition of the dimensionless damage mode are validated. A series of numerical simulations were conducted on the plate and stiffened plate structure of a ship, and the validity of the critical discriminant conditions of the dimensionless damage mode is confirmed. In conjunction with the underwater explosion impact factor, an engineering estimation method for the damage of the local plate structure of the ship is developed ultimately.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104313"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659166","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}

引用次数: 0

Comprehensive feature-based machine learning for fast prediction of marine propeller's open-water performance 基于特征的综合机器学习可快速预测船用螺旋桨的开放水域性能

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-14 DOI: 10.1016/j.apor.2024.104310

Liang Li , Yihong Chen , Shuo Xie , Yucheng Xiao , Tian Fang , Chao Wang

{"title":"Comprehensive feature-based machine learning for fast prediction of marine propeller's open-water performance","authors":"Liang Li , Yihong Chen , Shuo Xie , Yucheng Xiao , Tian Fang , Chao Wang","doi":"10.1016/j.apor.2024.104310","DOIUrl":"10.1016/j.apor.2024.104310","url":null,"abstract":"<div><div>To address the strong demand for the efficient iterative design of marine propellers, this study researched a rapid prediction surrogate model for propeller open-water performance using a dataset comprising 1980 propeller open-water performance test results. A dimension reduction method based on comprehensive features is proposed, and eight input parameters were determined through correlation and importance analysis. Five machine learning algorithms were utilized to construct the prediction surrogate model employing the Grid Search combined with K-fold Cross-Validation. The validation results indicate that the SVR model performed the best on the validation set, with errors in predicting <em>K<sub>T</sub></em>,10<em>K<sub>Q,</sub></em> and <em>η</em> within 2 %. Further validation was conducted on three unseen propellers in the test set and two new design propeller schemes. It is found that the SVR model, based on comprehensive features, demonstrated good accuracy for the open-water performance prediction of unseen propeller schemes, with errors within 4 %. Compared with the CFD method, the computational performance of the SVR model is approximately 1000 times faster<em>.</em> Additionally, it effectively identifies load variations resulting from overall or local adjustments in pitch distribution, providing new means for rapid performance prediction and optimization design of marine propellers.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104310"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656216","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}

引用次数: 0

Experimental Study on Sediment Suspension over the Liquefied Sand-clay Seabed under Waves 波浪作用下液化砂粘土海底沉积物悬浮实验研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-14 DOI: 10.1016/j.apor.2024.104314

Jun Zhang , Lizhu Wang , Zhiyong Zhang , Yihao Sun

引用次数: 0

Triaxial test on load-bear capacity of the vibro-compaction coral sand foundation in the South China Sea 南海振冲夯实珊瑚砂地基承载力的三轴试验

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104321

Ru Qu , Chenghao Ma , Haifeng Liu , Changqi Zhu , Tao Hu

{"title":"Triaxial test on load-bear capacity of the vibro-compaction coral sand foundation in the South China Sea","authors":"Ru Qu , Chenghao Ma , Haifeng Liu , Changqi Zhu , Tao Hu","doi":"10.1016/j.apor.2024.104321","DOIUrl":"10.1016/j.apor.2024.104321","url":null,"abstract":"<div><div>Vibro-compaction is the main improvement method for hydraulic reclamation coral sand sites. Currently, the load-bearing characteristics of coral sand composite foundation reinforced by vibro-compaction have not been clarified. This paper investigates strength characteristics of coral sand composite samples (core and shell) by artificially preparing radial variable-density coral sand composite samples and performing consolidated drained triaxial tests under different area replacement rates, core-shell density ratios, and confining pressures. The results of the study show that the contribution of the core gradually increases with the increasing area replacement rate. The peak strength and peak friction angle of samples also increase gradually, but the growth tendency gradually slows down. The stress concentration coefficient of sample core is variable and follows a development pattern of first increasing and then decreasing. The secant Young's modulus of composite samples increases in a power function type with the increase of area replacement rate. The particle breakage of samples is mainly the rupture and abrasion of the 0.5–1 mm and 0.1–0.25 mm particle groups that serve as fillers. The research results can provide technical support for coral reef engineering construction.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"153 ","pages":"Article 104321"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142659168","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}

引用次数: 0

Response of bioinspired scale arrangement in a suction caisson to penetrating into clay reflected by using interface direct shear tests 通过界面直接剪切试验了解吸力沉箱中的生物启发鳞片排列对穿透粘土的反应

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-11-13 DOI: 10.1016/j.apor.2024.104322

Dayong Li, Yongan Ma, Jipeng Zhao

{"title":"Response of bioinspired scale arrangement in a suction caisson to penetrating into clay reflected by using interface direct shear tests","authors":"Dayong Li, Yongan Ma, Jipeng Zhao","doi":"10.1016/j.apor.2024.104322","DOIUrl":"10.1016/j.apor.2024.104322","url":null,"abstract":"<div><div>The suction caisson has been used to support the offshore wind turbine in last decade. Normally, the resistance of the traditional suction caisson (TSC) to penetrating into the seabed is overcome by suction resulting in high soil plug causing early termination in installation. Therefore, this study proposes a novel scaled suction caisson (SSC) that adopts the bionic design concept of little forward resistance and large backward resistance in scaled belly of reptiles like snakes. The bioinspired scale is set on the outer sidewall of the TSC, which is called the SSC. Scale arrangement is the key factor to reduce penetration resistance of the SSC. To simulate the penetration, the interfacial direct shear tests are carried out along the cranial direction (i.e., forward direction of the snake). The interfacial behavior of the scaled steel plate and clay is studied under different consolidation pressures and normal stresses. The results show that normal stress is the key factor compared with the consolidation pressure. There are clay-scale shear zone and clay-clay shear zone during shearing with the increase of the scale height, respectively. In addition, the theoretical formula for calculating critical shear stress is proposed, and the calculated results are in great agreement with the model test. As the scale height increases from 0.5 mm to 1.5 mm, the peak shear stress first increases and then decreases. Meanwhile, it is determined that the design of the scale height in the clay cannot exceed 108 <em>d</em><sub>50</sub>. Finally, the optimal geometric characteristics and scale arrangements of the SSC are determined by analyzing the peak shear stress and peak internal friction angle of various scale-clay interfaces. The results can contribute to optimizing the scales arrangement for easy penetration of the SSC in clay.</div></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":"154 ","pages":"Article 104322"},"PeriodicalIF":4.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656214","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}

引用次数: 0