Oceans '97. MTS/IEEE Conference Proceedings最新文献_第7页

The use of near real-time in-situ sea level to improve global data bases 使用近实时的原位海平面来改进全球数据库

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624131

B.J. Kilnosky, M. Merrifield, P. Caldwell

引用次数: 1

GMDSS training-the impact of new technology GMDSS培训——新技术的影响

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624133

D. Underwood

引用次数: 0

The features of near bottom nepheloid layer at the steep ocean slope near Western Africa 西非附近海洋陡坡近底伞状层的特征

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634451

M.A. Evdoshenko

{"title":"The features of near bottom nepheloid layer at the steep ocean slope near Western Africa","authors":"M.A. Evdoshenko","doi":"10.1109/OCEANS.1997.634451","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.634451","url":null,"abstract":"Processes in the near bottom boundary layer of littoral ocean regions with intensive upwelling circulation are important for investigation of suspended matter transport and currents of biogen elements carried out from the bottom to the surface. Vertical profiles of turbidity from the ocean surface to the bottom with the Sea Tech Mark nephelometer were obtained during the research vessel \"Academic Mstislav Keldysh\" cruise in winter 1991-1992. Also vertical profiles of temperature, salinity and potential density were obtained with a Neil Brown probe. Measurements were performed at the shelf and continental slope near western Africa. More than a hundred profilings in the continuous mode at the steep ocean slope during vessel drift were made. At most vertical profiles the near bottom nepheloid layer (BNL) consisted of an upper thicker part with less turbidity and a thinner mixed part with greater turbidity. Structural parameters of the BNL were found to correlate with ocean depth. At the slope region near bottom layers were mainly powerful. A benthic turbid event characterized by strong mixing in the 125 m bottom layer was observed at an ocean depth of about 1000 m. The eddy with horizontal dimension of about 3 km that caused the event was found to occupy practically all the water column. The isopycnal bend at the eddy position was about ten meters; the eddy's lifetime was more than 2.5 days. A high turbidity BNL was also found at a depth of about 560 m. This benthic event was evidently caused by upwelling influence on the near bottom layer and followed the approach of the characteristic inclination value for the semi-diurnal internal tide M2 to the value of the bottom slope.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126336760","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}

引用次数: 0

1-3 piezocomposites, SonoPanels, arrays, and SmartPanels 1-3压电复合材料，SonoPanels，阵列，和SmartPanels

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624162

R. Gentilman, D. Fiore, P. McGuire, C. Near, W. Serwatka

{"title":"1-3 piezocomposites, SonoPanels, arrays, and SmartPanels","authors":"R. Gentilman, D. Fiore, P. McGuire, C. Near, W. Serwatka","doi":"10.1109/OCEANS.1997.624162","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624162","url":null,"abstract":"Summary form only, given as follows. 1-3 piezoelectric ceramic-polymer composites are finding many applications for underwater sensing, actuation, imaging, and active surface control. The Materials Systems' lead zirconate titanate (PZT) injection moulding process has made 1-3 piezocomposites commercially available and cost-competitive with traditional materials. Piezocomposites offer a number of performance advantages over traditional piezoelectric materials. Piezocomposite materials are used for SonoPanel transducers, which have now been qualified for US Navy systems, based on successful completion of pressure and shock tests. SonoPanels have high transmit and receive sensitivities and low noise as well as low profile and weight. SonoPanel transducers are being scaled-up from 250/spl times/250 mm to 750/spl times/750 mm panels. Piezocomposite SmartPanels for active control of surface displacement and/or surface impedance have been fabricated and evaluated. SmartPanels consist of 1-3 actuators and pressure sensors and net-shape-moulded PZT accelerometers in a low profile panel. Single layer and two-layer 100/spl times/100 mm SmartPanels have been tested for sensor sensitivities, actuator authority, surface displacement uniformity, and sensor-actuator coupling. SmartPanels are now being scaled-up to 250/spl times/250 mm. Performance and applications of SonoPanels and SmartPanels, including conformal transducers, multi-element arrays, and velocity sensors, are discussed. Design options for 1-3 piezocomposite materials and transducers are described.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"21 5-6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125651921","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}

引用次数: 1

Gray-scale visualization of wave spectra in an ocean eddy 海洋涡旋波浪谱的灰度可视化

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624166

I. Fraser, W.C. Risley

引用次数: 1

Surface current response to land-sea breeze circulation in Monterey Bay, California as observed by a new multifrequency HF radar 一种新型多频高频雷达观测到的加利福尼亚蒙特利湾地表流对陆海风环流的响应

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624130

J. Vesecky, C. Teague, R. Onstott, J. Daida, P. Hansen, D. Fernandez, N. Schnepf, K. Fischer

{"title":"Surface current response to land-sea breeze circulation in Monterey Bay, California as observed by a new multifrequency HF radar","authors":"J. Vesecky, C. Teague, R. Onstott, J. Daida, P. Hansen, D. Fernandez, N. Schnepf, K. Fischer","doi":"10.1109/OCEANS.1997.624130","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624130","url":null,"abstract":"A new multifrequency (4-25 MHz) HF radar was installed at the Long Marine Laboratory (University of California at Santa Cruz) on the north coast of Monterey Bay CA in July, 1996. This radar is capable of observing near-surface currents at varying depths in the top two meters of the ocean. Observations were made over a three week period in March, 1997 during which there was a strong land-sea breeze circulation over Monterey Bay. Radial current measurements corresponding to depths of about 0.3, 0.5, 1.0 and 1.4 m were made during this period using HF radar data from four operating frequencies, 21.8, 13.4, 6.8 and 4.8 MHz. Fourier analysis of these data shows that very near the surface the strongest periodic component is a diurnal one corresponding to the diurnally varying surface stress from the land-sea breeze. At deeper depths the diurnal component decreases in strength, but remains dominant. A semi-diurnal component, corresponding to tidally driven current, grows in strength with increasing depth of the current measurement. Thus, multifrequency HF radar combined with deeper current measurements from buoys and moorings are able to investigate the upper layer of the coastal ocean where wind and tidally driven currents struggle for dominance. Installation and calibration of a second radar at the Moss Landing Marine Laboratory, south of Santa Cruz along the Monterey Bay coast, is in progress to allow measurement of vector currents from radial observations at the two radar sites.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129826910","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}

引用次数: 4

Use of tow tanks to study sensitive current meters 使用两个水箱来研究灵敏的电流计

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624143

F.T. Thwaites, A. Williams

{"title":"Use of tow tanks to study sensitive current meters","authors":"F.T. Thwaites, A. Williams","doi":"10.1109/OCEANS.1997.624143","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624143","url":null,"abstract":"The importance of accurate calibration of current sensors has increased as current sensors have become more sensitive, and as scientists study turbulence and mixing in boundary layers. Current sensors are often calibrated in tow tanks. This paper discusses and presents some measurements of some of the complexities of calibration in tow tanks. Residual convective currents cause a noise floor in calibration. Sensor wakes cause gain errors and increase the ambient turbulence if not dissipated before a successive measurement is made in the same water. Proximity to surfaces can affect the velocity gain of current sensors. Density stratification in water and the internal waves it allows add complexity to measuring slow flows. Strumming of current meter mounts greatly increases the velocity noise of current meters. Measurements of velocities in current sensor wakes are compared with far-field turbulent wake models to characterize how long one must wait between tank tows in order for wakes to dissipate. Wake velocities caused by sensors that looked like they would leave two-dimensional wakes, in fact, decayed as velocities in three-dimensional wakes. Three-dimensional wake velocities dissipate more rapidly than two-dimensional wakes velocities, reducing the time required to wait between measurements in tow tanks.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129867930","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}

引用次数: 6

Modeling and control of an autonomous underwater shuttle for the transport of benthic laboratories 底栖生物实验室运输自主水下穿梭器的建模与控制

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624110

Antonio Pedro Aguiar, A. Pascoal

引用次数: 37

Extensible physical oceanographic real-time system (PORTS) 可扩展物理海洋实时系统(PORTS)

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624208

W. Wilmot, J. Galt, R. T. Cheng

{"title":"Extensible physical oceanographic real-time system (PORTS)","authors":"W. Wilmot, J. Galt, R. T. Cheng","doi":"10.1109/OCEANS.1997.624208","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624208","url":null,"abstract":"NOAA's PORTS is a decision support system to facilitate safe and efficient maritime commerce and effective environmental resource management. PORTS is installed in Tampa Bay, New York/New Jersey Harbor, Houston/Galveston, and San Francisco Bay. PORTS consists of real-time observations of ocean conditions and weather, computer model nowcasts and forecasts of ocean fields, and dissemination of data via a telephone voice data response system and Internet. PORTS information ensures that an adequate margin of safety is available to larger and larger ships in channels which are being deepened but not significantly widened. PORTS provides information permitting shippers to load their vessels to take full advantage of real-time water levels and channel improvements. PORTS information guides hazardous materials spill prevention and response as well as effective ecosystem health management. The San Francisco Bay PORTS is the model for a future National PORTS. That model is an extensible PORTS based on an Information Hub Concept (InfoHub) which will permit PORTS to adapt to evolving user needs. The extensible PORTS provides standard sensor interfaces to encourage the addition of non-NOAA sensors to the system. A data base provides a broad user community with access through downloadable applications and applets on Internet. PORTS provides information broadcast to shipboard vector and raster Electronic Chart and Information Display Systems and a Lockheed Martin/Rensselaer Polytechnic Institute Navigation and Piloting Expert Systems (NPES). An open architecture design will encourage commercial and academic partners to participate in National PORTS development.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124559190","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}

引用次数: 3

Calibration of a directional hydrophone in a hydroacoustic tank using the Prony method 用proony方法标定水声槽内的定向水听器

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624189

D. Schlosberg

引用次数: 2