Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968265
M. Fan, Y. B. Low, J.S. Smith, J. C. Evans, J. Seim
STAR (Subsea Tools Application Research) was an underwater technology development project to develop advanced tools and control techniques for remote subsea intervention in diverless operations. As part of the STAR project an all-electric torque tool control system for underwater operation was developed. Its mechanical and control system design is modular, allowing a ROV or AUV to perform a range of subsea tasks such as bolt tightening/slackening, drilling, stabbing and metering. An important feature of the design philosophy was its modular, hierarchical control structure. The hierarchical design and utilization of controller area network (CAN) technology made it possible to implement a sophisticated real-time control system. This paper gives an overview of the STAR project, technical details of multilayer control system and its communications structure. Details of the testing procedures, and application areas are also discussed.
STAR (Subsea Tools Application Research，水下工具应用研究)是一项水下技术开发项目，旨在开发先进的水下工具和控制技术，用于无潜水器作业中的远程水下干预。作为STAR项目的一部分，开发了用于水下作业的全电动扭矩工具控制系统。它的机械和控制系统设计是模块化的，允许ROV或AUV执行一系列水下任务，如螺栓拧紧/松开、钻井、刺入和计量。该设计理念的一个重要特征是其模块化、分层控制结构。分层设计和控制器局域网(CAN)技术的应用使复杂的实时控制系统成为可能。本文概述了STAR项目，多层控制系统的技术细节及其通信结构。详细的测试程序和应用领域也进行了讨论。
{"title":"STAR (Subsea Tools Application Research) design of a general purpose subsea torque tool for ROV or UUV","authors":"M. Fan, Y. B. Low, J.S. Smith, J. C. Evans, J. Seim","doi":"10.1109/OCEANS.2001.968265","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968265","url":null,"abstract":"STAR (Subsea Tools Application Research) was an underwater technology development project to develop advanced tools and control techniques for remote subsea intervention in diverless operations. As part of the STAR project an all-electric torque tool control system for underwater operation was developed. Its mechanical and control system design is modular, allowing a ROV or AUV to perform a range of subsea tasks such as bolt tightening/slackening, drilling, stabbing and metering. An important feature of the design philosophy was its modular, hierarchical control structure. The hierarchical design and utilization of controller area network (CAN) technology made it possible to implement a sophisticated real-time control system. This paper gives an overview of the STAR project, technical details of multilayer control system and its communications structure. Details of the testing procedures, and application areas are also discussed.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114604939","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968278
G. Jensen
The South Florida Ocean Measurement Center (SFOMC) is a coastal ocean observatory combining government, commercial, and academic resources, intellectual talents, and modern facilities to create a new global-interest center where high fidelity and cost effective experiments and studies can be conducted. The combined SFOMC in-water and shore facilities located in southern Florida provide a fully integrated observatory to archive measurements, provide ground truth to validate hydrographic survey systems, intercompare in situ data with emerging oceanographic instruments, and to disseminate environmental information supporting maritime operations. Specific accomplishments at SFOMC include installation of innovative environmental arrays and data analyses, a 4-dimensional current experiment, AUV operations and mine hunting experiments, adverse weather experiments, studies of fluctuations, coherence, and predictability of long range shallow water acoustic propagation, bio/geological inventories and assessments, and rehearsals for Fleet Battle Experiments. The implementation of SFOMC as a Government-University laboratory to observe littoral processes has been successful. SFOMC is being sustained through ongoing operations and experiments with established sponsorship from ONR, NSF, NOPP, NAVSEA, and DARPA as well as state and local government.
{"title":"South Florida Ocean Measurement Center (SFOMC) \"a coastal ocean observatory\"","authors":"G. Jensen","doi":"10.1109/OCEANS.2001.968278","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968278","url":null,"abstract":"The South Florida Ocean Measurement Center (SFOMC) is a coastal ocean observatory combining government, commercial, and academic resources, intellectual talents, and modern facilities to create a new global-interest center where high fidelity and cost effective experiments and studies can be conducted. The combined SFOMC in-water and shore facilities located in southern Florida provide a fully integrated observatory to archive measurements, provide ground truth to validate hydrographic survey systems, intercompare in situ data with emerging oceanographic instruments, and to disseminate environmental information supporting maritime operations. Specific accomplishments at SFOMC include installation of innovative environmental arrays and data analyses, a 4-dimensional current experiment, AUV operations and mine hunting experiments, adverse weather experiments, studies of fluctuations, coherence, and predictability of long range shallow water acoustic propagation, bio/geological inventories and assessments, and rehearsals for Fleet Battle Experiments. The implementation of SFOMC as a Government-University laboratory to observe littoral processes has been successful. SFOMC is being sustained through ongoing operations and experiments with established sponsorship from ONR, NSF, NOPP, NAVSEA, and DARPA as well as state and local government.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114819678","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968297
T. Meese, D. Edgington, W. Radochonski, K. Headley, S. Jensen
The Monterey Bay Aquarium Research Institute (MBARI) is a privately funded, non-profit research institute dedicated to technology development in support of the oceanographic community. The New Mooring Controller (NMC) project was begun at MBARI in the fall of 2000 to develop the next evolutionary step to the current OASIS mooring controller. The NMC design features a low-power 32-bit embedded processor and incorporates advanced embedded software technologies. This paper focuses on the system requirements and design decisions that were made regarding system hardware and software.
{"title":"A New Mooring Controller platform: an evolution of the OASIS instrument controller toward a distributed ocean observing system","authors":"T. Meese, D. Edgington, W. Radochonski, K. Headley, S. Jensen","doi":"10.1109/OCEANS.2001.968297","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968297","url":null,"abstract":"The Monterey Bay Aquarium Research Institute (MBARI) is a privately funded, non-profit research institute dedicated to technology development in support of the oceanographic community. The New Mooring Controller (NMC) project was begun at MBARI in the fall of 2000 to develop the next evolutionary step to the current OASIS mooring controller. The NMC design features a low-power 32-bit embedded processor and incorporates advanced embedded software technologies. This paper focuses on the system requirements and design decisions that were made regarding system hardware and software.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117080135","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968047
F. Pappalardi, S. Dunham, M. Leblang, T. E. Jones, J. Bangert, G. Kaplan
The U.S. Navy is currently pursuing several approaches to improving the reliability of precision navigation systems, including those that would still permit precision navigation in the event that the Global Positioning System (GPS) is denied or unavailable. This paper examines two alternatives to GPS: bathymetric and celestial navigation. Bathymetric navigation, a non-deniable source of position, determines a position by correlating real time returns from an echo sounder with a digitally stored bathymetric map of an area being traversed. While used successfully for many years by ballistic missile submarines, neither current attack submarines nor surface ships have taken full advantage of this technology. The SSC-SD has demonstrated that when using GPS-based, high-resolution bathymetric charts, along with narrow beam echo sounders, position fix accuracy approaching that of the reference chart can be achieved. Studies conducted by the U.S. Naval Observatory (USNO) show that using present-day star tracker technology, position accuracy derived from a celestial reference could be within one arcsecond (30 meters or 100 feet on the Earth's surface). The USNO, SSC-SD, and the Naval Research Laboratory are currently conducting a joint feasibility study to assess the technology used in modern star trackers. The goal is the development of small, lightweight, inexpensive, and reliable celestial systems that can be coupled to existing Inertial navigation systems for ship and aircraft navigation. Both of these alternatives to GPS can be used to improve navigation performance, and to provide accurate position in the event of GPS loss or denial.
{"title":"Alternatives to GPS","authors":"F. Pappalardi, S. Dunham, M. Leblang, T. E. Jones, J. Bangert, G. Kaplan","doi":"10.1109/OCEANS.2001.968047","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968047","url":null,"abstract":"The U.S. Navy is currently pursuing several approaches to improving the reliability of precision navigation systems, including those that would still permit precision navigation in the event that the Global Positioning System (GPS) is denied or unavailable. This paper examines two alternatives to GPS: bathymetric and celestial navigation. Bathymetric navigation, a non-deniable source of position, determines a position by correlating real time returns from an echo sounder with a digitally stored bathymetric map of an area being traversed. While used successfully for many years by ballistic missile submarines, neither current attack submarines nor surface ships have taken full advantage of this technology. The SSC-SD has demonstrated that when using GPS-based, high-resolution bathymetric charts, along with narrow beam echo sounders, position fix accuracy approaching that of the reference chart can be achieved. Studies conducted by the U.S. Naval Observatory (USNO) show that using present-day star tracker technology, position accuracy derived from a celestial reference could be within one arcsecond (30 meters or 100 feet on the Earth's surface). The USNO, SSC-SD, and the Naval Research Laboratory are currently conducting a joint feasibility study to assess the technology used in modern star trackers. The goal is the development of small, lightweight, inexpensive, and reliable celestial systems that can be coupled to existing Inertial navigation systems for ship and aircraft navigation. Both of these alternatives to GPS can be used to improve navigation performance, and to provide accurate position in the event of GPS loss or denial.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117136923","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968761
Kangsoo Kim, T. Sutoh, T. Ura, T. Obara
An AUV (autonomous underwater vehicle) of R-One Robot, developed by joint cooperation between IIS, University of Tokyo and Mitsui Engineering & Shipbuilding, has been achieving several missions since it was constructed. Since it is not unusual for an AUV to face more or less strong currents during its operation, it is not so easy to accomplish the mission of route keeping precisely due to the interaction between current and vehicle motion. In this research, a dynamics model of the R-One Robot has been established through iterative numerical calculations based on CFD analysis. Heading angle control with additional correction to keep to the target route under current interaction has been carried out by using a PID controller based on the derived dynamics model. Achievement of superior route keeping ability has been confirmed from the result of numerical simulation as well as the recorded cruising trajectory during its actual operation at sea. With this improved route keeping ability, the R-One Robot is expected to be more useful for difficult missions.
{"title":"Route keeping control of AUV under current by using dynamics model via CFD analysis","authors":"Kangsoo Kim, T. Sutoh, T. Ura, T. Obara","doi":"10.1109/OCEANS.2001.968761","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968761","url":null,"abstract":"An AUV (autonomous underwater vehicle) of R-One Robot, developed by joint cooperation between IIS, University of Tokyo and Mitsui Engineering & Shipbuilding, has been achieving several missions since it was constructed. Since it is not unusual for an AUV to face more or less strong currents during its operation, it is not so easy to accomplish the mission of route keeping precisely due to the interaction between current and vehicle motion. In this research, a dynamics model of the R-One Robot has been established through iterative numerical calculations based on CFD analysis. Heading angle control with additional correction to keep to the target route under current interaction has been carried out by using a PID controller based on the derived dynamics model. Achievement of superior route keeping ability has been confirmed from the result of numerical simulation as well as the recorded cruising trajectory during its actual operation at sea. With this improved route keeping ability, the R-One Robot is expected to be more useful for difficult missions.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116055799","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968276
I. Lam, I. J. Hodgkiss
An apparently increasing trend of red tide occurrences and/or harmful algal blooms has become a global issue, particularly in coastal zones with 'cultural eutrophication', but no effective measures have been developed yet for detection and early warning, in order to prevent public health problems and the threat of economic losses. A multiple-probe-and-sensor based telemetry system has been developed to monitor water quality parameters, hydrographic variables and meteorological conditions, in order to provide almost real time and continuous data for red tide studies. Several red tides have been detected with the system during the study period and this suggests that it potentially fulfills the purposes of detection and early warning. However, there is still room to improve, upgrade and develop further this prototype system to apply it widely to coastal regions, particularly fish culture zones in which red tides occur frequently and intensively. Real-time telemetric data can provide background information concerning red tide formation conditions, and can be extended to bio-ecological studies so as to enhance our understanding of the interactions between red tides and marine microalgal dynamics, by overcoming the limitations of the traditional approaches.
{"title":"A real time measurement system for red tide studies","authors":"I. Lam, I. J. Hodgkiss","doi":"10.1109/OCEANS.2001.968276","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968276","url":null,"abstract":"An apparently increasing trend of red tide occurrences and/or harmful algal blooms has become a global issue, particularly in coastal zones with 'cultural eutrophication', but no effective measures have been developed yet for detection and early warning, in order to prevent public health problems and the threat of economic losses. A multiple-probe-and-sensor based telemetry system has been developed to monitor water quality parameters, hydrographic variables and meteorological conditions, in order to provide almost real time and continuous data for red tide studies. Several red tides have been detected with the system during the study period and this suggests that it potentially fulfills the purposes of detection and early warning. However, there is still room to improve, upgrade and develop further this prototype system to apply it widely to coastal regions, particularly fish culture zones in which red tides occur frequently and intensively. Real-time telemetric data can provide background information concerning red tide formation conditions, and can be extended to bio-ecological studies so as to enhance our understanding of the interactions between red tides and marine microalgal dynamics, by overcoming the limitations of the traditional approaches.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123351289","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968424
R. Moody
Many designs exist for AUVs, however most only lend themselves to cruising type operations. Few designs exist for hovering, station keeping with respect to an object, and moving in all degrees of freedom within a confined space. Propeller-driven AUVs that look similar to ROVs can be used to do this, however, they require 6 propeller units to achieve 6 degree of freedom motion. One alternative is to use oscillating flexible fins (Nektors) to propel the vehicle. Nektors are capable of imparting large forces to the vehicle very quickly thereby providing the accelerations that are needed to change direction or stop quickly. This AUV design is reliable (mechanically and electrically sound), modular, and is small enough to be easily deployed by two people. This AUV is being used for research on control algorithms, Nektor designs, and effect of hull shapes. The paper details the design, construction and some testing of a successfully implemented Nektor based AUV.
{"title":"The design, construction, and testing of a flexible fin propelled autonomous underwater vehicle","authors":"R. Moody","doi":"10.1109/OCEANS.2001.968424","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968424","url":null,"abstract":"Many designs exist for AUVs, however most only lend themselves to cruising type operations. Few designs exist for hovering, station keeping with respect to an object, and moving in all degrees of freedom within a confined space. Propeller-driven AUVs that look similar to ROVs can be used to do this, however, they require 6 propeller units to achieve 6 degree of freedom motion. One alternative is to use oscillating flexible fins (Nektors) to propel the vehicle. Nektors are capable of imparting large forces to the vehicle very quickly thereby providing the accelerations that are needed to change direction or stop quickly. This AUV design is reliable (mechanically and electrically sound), modular, and is small enough to be easily deployed by two people. This AUV is being used for research on control algorithms, Nektor designs, and effect of hull shapes. The paper details the design, construction and some testing of a successfully implemented Nektor based AUV.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124856719","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968228
A. Orlov
On the basis of shipboard analysis, the diets of 6 species of deep-benthic skates were examined: Aleutian skate Bathyraja aleutica, Alaska skate B. parmifera, Matsubara skate B. matsubarai, whiteblotched skate B. maculata, whitebrow skate B. minispinosa, and Okhotsk skate B. violacea.
{"title":"Feeding habits of some deep-benthic skates (Rajidae) in the western Bering Sea","authors":"A. Orlov","doi":"10.1109/OCEANS.2001.968228","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968228","url":null,"abstract":"On the basis of shipboard analysis, the diets of 6 species of deep-benthic skates were examined: Aleutian skate Bathyraja aleutica, Alaska skate B. parmifera, Matsubara skate B. matsubarai, whiteblotched skate B. maculata, whitebrow skate B. minispinosa, and Okhotsk skate B. violacea.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122951943","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968048
G.F. DeVogel, P.K. Baccei, P. Shaw
This paper will examine the important navigational issues facing today's Navy in its pursuit of ECDIS-N. Next, it will review the AoA findings contributing to the acquisition community's awareness and understanding of the Navy's requirements for electronic chart-based navigation equipment and systems. It will also explore NAVSSI Lite, one of the system solutions that will capably meet the requirements. Finally, it will look at the myriad issues involved in the Navy achieving its all-electronic navigation goals.
{"title":"The United States Navy navigating in the 21/sup st/ century","authors":"G.F. DeVogel, P.K. Baccei, P. Shaw","doi":"10.1109/OCEANS.2001.968048","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968048","url":null,"abstract":"This paper will examine the important navigational issues facing today's Navy in its pursuit of ECDIS-N. Next, it will review the AoA findings contributing to the acquisition community's awareness and understanding of the Navy's requirements for electronic chart-based navigation equipment and systems. It will also explore NAVSSI Lite, one of the system solutions that will capably meet the requirements. Finally, it will look at the myriad issues involved in the Navy achieving its all-electronic navigation goals.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121879288","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}
Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968153
P. Hamilton, J. Singer, E. Waddell, G. Robertson
Moored current and temperature measurements on the San Pedro shelf show that the circulation has three major components. The sub-tidal currents are primarily a result of slope circulation processes including the California Counter Current and poleward Undercurrent. Fluctuations have characteristic periods of 10 to 30 days with magnitudes decreasing from the shelf-break shorewards. Persistent sea-breezes force sub-inertial clockwise rotary current fluctuations on the outer shelf with a one-day period. These are present throughout the year with the highest amplitudes in summer. These fluctuations decay rapidly with depth. Tidal currents are predominantly semidiurnal. They are barotropic and aligned with the isobaths near the coast, but at the shelf break, there is evidence of internal tide generation with cross-isobath flows near the seabed.
{"title":"Circulation processes on the San Pedro shelf","authors":"P. Hamilton, J. Singer, E. Waddell, G. Robertson","doi":"10.1109/OCEANS.2001.968153","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968153","url":null,"abstract":"Moored current and temperature measurements on the San Pedro shelf show that the circulation has three major components. The sub-tidal currents are primarily a result of slope circulation processes including the California Counter Current and poleward Undercurrent. Fluctuations have characteristic periods of 10 to 30 days with magnitudes decreasing from the shelf-break shorewards. Persistent sea-breezes force sub-inertial clockwise rotary current fluctuations on the outer shelf with a one-day period. These are present throughout the year with the highest amplitudes in summer. These fluctuations decay rapidly with depth. Tidal currents are predominantly semidiurnal. They are barotropic and aligned with the isobaths near the coast, but at the shelf break, there is evidence of internal tide generation with cross-isobath flows near the seabed.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122089732","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}
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