OCEANS 2019 - Marseille最新文献

{"title":"Influence of Wind and Shipping Noises on the Depth Dependence and Spatial Coherence of Ambient Noise in the Deep Ocean: A Simulation Study","authors":"Kai Zhang, T. C. Yang, Wen Xu","doi":"10.1109/OCEANSE.2019.8867122","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867122","url":null,"abstract":"Previous experiments showed that the ambient noise level in deep ocean is smaller below the critical depth than above the critical depth. While the general features of the ambient noise was understood, quantitative studies must consider the acoustic conditions where the data are collected. In this paper, we analyze the depth dependence and vertical coherence of surface-generated noises at low frequencies using simulated data, and study the influence of environmental conditions such as local/distant wind and shipping. The results can be used to interpret the experimental data.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117093466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Fault Location Algorithm Based on Convolutional Neural Network for Sensor System of Seafloor Observatory Network","authors":"K. Sun","doi":"10.1109/OCEANSE.2019.8867166","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867166","url":null,"abstract":"The seafloor observatory network (SFON) covers an extensive area and consists of many network devices functioning in the abyssal environment, which make patrolling inapplicable to fault location in the marine setting. Moreover, finding faults like degradation of precision or zero drift would be rather difficult if such faults are only located by the warning message from a single sensor. To solve this problem and as per the features of SFON, we propose a fault location algorithm based on the convolutional neural network (CNN) for the data transmission system. This algorithm which takes a holistic perspective and considers the features of network device can monitor all the sensors in a unified and centralized way. The algorithm sets the CNN parameters according to the features of the research object, and normalizes the data of sensors to images. It first qualitatively judges a fault, and then recognizes its source and type. The new algorithm has higher precision on fault recognition than the support vector machine.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129567936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental identification of the dynamic characteristics for a 1/25 scale model of the Watertruck+ self-propelling barge","authors":"S. V. Baelen, Stan Drijkoningen, C. Moons, M. R. Afzal, P. Slaets","doi":"10.1109/OCEANSE.2019.8867545","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867545","url":null,"abstract":"This study discusses the experimental identification of the dynamic characteristics for an operational 1/25 scale model of the Watertruck+ self-propelling barge of CEMT class I. Parameters such as flow rate, acceleration, thrust and speed-dependent resistance forces in the longitudinal direction are determined. The operational scale model discussed in this paper includes a hull with length 1.54 m, width of 0.2 m and height of 0.2 m. All experiments are performed at an indoor pool to reduce environmental disturbances such as wind and current. The vessel’s behavior and propulsion system, i.e. a 4-pump system, is analyzed and subsequently validated by modeling the pump circuit and corresponding pipe losses. The experimental results of the resistance forces are validated by applying Computational Flow Dynamics in SolidWorks, using the Finite Volume Method. By generating the pump and pipeline characteristic, the operating point is determined that provides insight on the overall efficiency, which is equal to 11.36%. Moreover, a second order polynomial is fitted to the experimental resistance forces, with a correlation coefficient of 0.99, which suggest a high accuracy and feasibility of the identified parameters. Results indicate that minor hardware improvements in the pump circuit would improve the performance significantly; however, the current vessel and propulsion system are suited for envisioned future research objectives such as testing new control algorithms.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129861360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A two-way approach to adapt reduced-scale laboratory experiments and corresponding numerical simulations of offshore seismic surveys in complex marine environments","authors":"N. Favretto-Cristini, B. Solymosi, P. Cristini, V. Monteiller, B. Ursin, D. Komatitsch","doi":"10.1109/OCEANSE.2019.8867188","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867188","url":null,"abstract":"Recently, laboratory experiments have been reintroduced in the ideas-to-applications pipeline for geophysical issues. Benefiting from recent technologic^ advances, we believe that in the coming years, laboratory experiments can play a major role, in support of field experiments and numerical modeling, to explore some of the current challenges of seismic imaging in terms of, for instance, acquisition design or benchmarking of new imaging techniques at a low cost and in an “agile” way. But having confidence in the quality and the accuracy of the experimental data obtained in a complex configuration that mimics at a reduced scale a real geological environment is an essential prerequisite. This requires a robust framework regardless of the configuration studied. The goal of this work is to provide a global reflection on this framework in the context of offshore seismics. To illustrate this framework, we rely on a reduced-scale model representing a 3D complex-shaped salt body buried in sedimentary layers with curved surfaces. Zero-offset and offset reflection data are collected on this model in a water tank, using a conventional pulse-echo technique. We follow a cross-validation approach that allows, through the comparison between the experimental data and the numerical simulation of wave propagation, to point out both the improvements of the experimental setup that must still be made to increase the accuracy (and decrease the uncertainties) of the experiments, and the limitations of the numerical tools that must be tackled. This framework can be used with confidence to extensively investigate cutting-edge seismic imaging and acquisition issues in complex environments.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128486835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cooperative Guidance System for AUV Docking with an Active Suspended Docking Station","authors":"A. Yazdani, K. Sammut, A. Lammas, B. Clement, O. Yakimenko","doi":"10.1109/OCEANSE.2019.8867214","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867214","url":null,"abstract":"This paper presents an effective guidance system to enable a torpedo-shaped autonomous underwater vehicle (AUV) to perform cooperative docking with an active suspended docking station. A funnel-shaped docking station equipped with lateral thrusters for automatic adjustment of the heading of the docking station in a planar motion, together with an attitude and heading reference system (AHRS), acoustic Doppler Velocity Logger (DVL), and an ultra-short baseline (USBL) transponder is considered. The proposed guidance system is developed using the optimal control theory based Inverse Dynamics in the Virtual Domain (IDVD) method for fast prototyping of near-optimal trajectories and ensuring an implementable guidance system for real-time closed-loop maneuvering. This work is an extension of previous related work by the authors to develop IDVD based docking guidance strategies for AUVs. The cooperative docking process is accomplished by transmitting the AUV’s intended docking trajectory to the docking station ahead of the docking operation, thus enabling the docking station to automatically adjust its heading to ensure alignment with the incoming AUV. The simulation results demonstrate that the performance of the cooperative docking guidance between the AUV and the active docking station increases the possibility of safe, smooth, and efficient arrival of the AUV into the docking station even in presence of cross-current disturbances. This performance is achieved by means of an efficient and tractable guidance system that enables fast prototyping of near-optimal trajectories that will facilitate real-time closed-loop docking maneuvering.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128554738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of an Aquatic USV with High Communication Capability for Environmental Surveillance","authors":"A. Gaugue, M. Ménard, Etienne Migot, P. Bourcier, Clement Gaschet","doi":"10.1109/OCEANSE.2019.8867382","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867382","url":null,"abstract":"Nowadays, involved novel communication technologies for littoral environment monitoring become a necessity. In fact, ensuring reliable monitoring tasks in marine condition require facing up many challenges. The most important one is relative to the harshest environment that affects considerably the communication capability of the monitoring components as buoys or Unmanned Surface Vehicles. This paper presents a conceptual design and field test validation of an aquatic Unmanned Surface Vehicle (USV) equipped to realize maritime surveillance and environmental monitoring missions. We describe the combined operations of a custom made USV and an Unmanned Aerial System (UAS), linked together within one network to increase autonomy and communication capability. The document also describes the design and implementation of hardware and software for both the USV and UAS.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124570074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An ESA Project: Sentinel coastal charting worldwide and other SDB applications","authors":"J. Laporte, Fatimatou Coulibaly","doi":"10.1109/OCEANSE.2019.8867284","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867284","url":null,"abstract":"Although limited to a band extending less than 20 km beyond the coastline, Sentinel footprints cover most of the World coastal waters and can provide Mariners with valuable information when sailing in poorly charted shallow areas.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124738321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High Data Rate Wireless Underwater Sensors for Environemental Monitoring","authors":"Thierry Deschamps de Paillette, A. Gaugue","doi":"10.1109/OCEANSE.2019.8867364","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867364","url":null,"abstract":"Costal pollution and seawater quality monitoring requires underwater sensors to be properly and regularly measured. This paper introduces an innovative prototype of reliable electromagnetic based wireless submarine communication system adapted to a medium-range telemetry application. This work, starting from the study of seawater properties describes the design and simulation results of antennas, matching circuits and modulation techniques to optimize the link budget and data rate between a surface buoy and underwater probes.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124743083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ship Detection: An Improved YOLOv3 Method","authors":"Haiying Cui, Yang Yang, Mingyong Liu, Tingchao Shi, Qian Qi","doi":"10.1109/OCEANSE.2019.8867209","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867209","url":null,"abstract":"YOLOv3 is the state of art detector, which performs an excellent balance in detection speed and accuracy. In this paper, an improved YOLOv3 model named YOLOv3-ship is proposed for the ship detection. The main contributions to the YOLOv3-ship consists of dimension Clusters, network Improvement and embedding of the Squeeze-and-Excitation(SE) module. The experiments results show that the detection accuracy has been significantly improved by the YOLOv3-ship.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129475242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Passive sampling techniques for monitoring metals in transitional and coastal waters in the Atlantic region","authors":"F. Regan, Blánaid White, M. Nolan, I. Amouroux, Jean-Louis Gonzalez, S. Guesdon, M. J. Belzunce-Segarra, J. Franco, I. Menchaca, P. Bersuder, T. Bolam, Alexandre Bettoschi, B. Marras, N. Montero, M. Schintu, M. Caetano, N. Rosa, Inês Carvalho, Margarida Maria, B. McHugh, D. Merkel, V. M. Gabet, M. R. Sanz, O. Perceval, C. Robinson","doi":"10.1109/OCEANSE.2019.8867564","DOIUrl":"https://doi.org/10.1109/OCEANSE.2019.8867564","url":null,"abstract":"In highly dynamic systems, such as transitional and coastal waters, establishing their chemical status is challenging. MONITOOL is an exciting European project consisting of 16 Partners covering the Atlantic region from the Canary Islands to the Scottish Highlands and Islands, which aims to address this complex analytical challenge, responding to European Directive demands for the assessment of the chemical status of transitional and coastal waters. Diffusive Gradient in Thin Films (DGT), and passive samplers (PS), in general, are already widely used in investigative monitoring and there is an increasing interest in their use for the environmental assessment of water bodies, within European policies requirements. The main barrier hindering the regulatory acceptance of PS for compliance checking is the lack of appropriate Environmental Quality Standards (EQS). EQSs for metals are defined in the dissolved fraction, preventing the use of DGT-labile concentrations for the establishment of the chemical status of water bodies. The first sampling campaigns were performed during winter 2017/2018 in 4 selected sites (transitional and coastal sites) in each consortium region (8 regions). All partners followed the same protocol for sampling and analysis to minimize the operational variability. Priority metals (Cd, Ni, Pb) and other specific metals (Al, Ag, Cu, Cr, Co, Fe, Mn, Zn) were analysed in waters and in the DGT resins. Statistical analysis is being applied to study relationships between metal concentrations in DGT and in grab water samples. Suitable EQS for DGTs will be calculated on basis the statistical relations obtained previously. This will permit a better implementation of the Water Framework Directive in variable systems like transitional and coastal waters. The work presented here shows initial DGT results from the Irish sampling sites for selected target metals.","PeriodicalId":375793,"journal":{"name":"OCEANS 2019 - Marseille","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130631344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}