Proceedings of the 1986 IEEE Third Working Conference on Current Measurement最新文献

Shallow water tomography 浅水层析成像

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1986-12-01 DOI: 10.1109/CCM.1986.1158494

H. Deferrari, N. Williams, D. Ko

{"title":"Shallow water tomography","authors":"H. Deferrari, N. Williams, D. Ko","doi":"10.1109/CCM.1986.1158494","DOIUrl":"https://doi.org/10.1109/CCM.1986.1158494","url":null,"abstract":"The tomogaphic approach with reciprocal transmission has been applied to a shallow water area in the Florida Straits to give a direct observation of range and depth averaged currents and temperatures. Such spatial averages are not easily obtained with conventional current measurement methods. The propagation models and inversion methods of deep ocean tomography cannot be directly applied to shallow water locations since the spread in arrival times amongst paths is inherently limited in shallow propagation channels and the interaction with the rough ocean bottom can cause further uncertainty in path identification and travel time measurements. Nevertheless, acoustic reciprocal transmission experiments have been successful in the Florida Straits. Acoustic measures are interpreted with ray theory and parabolic equation propagation models to give averaged currents and temperatures which are in good agreement with measurements with current meter arrays. The experimental approach, inversion methods and equipment requirement are considered for the Florida Straits experiment and for applictions to other shallow water areas. The precision and limitations of the method are discussed.","PeriodicalId":163199,"journal":{"name":"Proceedings of the 1986 IEEE Third Working Conference on Current Measurement","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1986-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115359999","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

Field evaluations of a bottom-mounted acoustic doppler profiler and conventional current meter moorings 海底多普勒声学剖面仪和常规海流计系泊的现场评估

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158487

N. Pettigrew, J. Irish, R. Beardsley

引用次数: 28

Recent improvements in ocean current measurement from motional electric fields and currents 从运动电场和洋流测量海流的最新进展

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158480

T. Sanford

{"title":"Recent improvements in ocean current measurement from motional electric fields and currents","authors":"T. Sanford","doi":"10.1109/CCM.1986.1158480","DOIUrl":"https://doi.org/10.1109/CCM.1986.1158480","url":null,"abstract":"Scientific studies of ocean dynamics and transports require rapid and accurate observations of velocities over large spatial scales. One opportunity to provide some of the needed data is available in the naturally occurring electric currents and magnetic field. These EM signals arise from the motion of sea water through the Earth's magnetic field and contain information about the local and regional velocity. The mixture of local and distant responses is often considered a liability, but this seeming problem can be turned into a great benefit. The local contribution is the water velocity,v, at the sensor location. The distant contribution is determined primarily by the average velocity over the vertical water column, denoted asbar{v}^{astr}. The apparent velocity sensed by an instrument moving with the local water velocity is equal tov - bar{v}^{astr}. A method to separate these contributions and, thereby, isolatebar{v}^{astr}is to obtain simultaneous EM and navigational information. The difference between an independent measurement of the local horizontal velocity and the EM-derived velocity yieldsbar{v}^{astr}. Becausebar{v}^{astr}is usefully close to beingbar{v}, the vertically averaged velocity, the method holds significant potential for improving current measurement technology. Measurements of motionally induced electric fields and currents are being made from submarine cables, towed electrode systems and free-fall profilers. Significant new information about steady and variable ocean transport has been obtained from these methods. Examples of the recent progress in measurements, interpretations and instrumentation are discussed, and a new device to measurebar{v}^{astr}, called the Towed Transport Meter, is described.","PeriodicalId":163199,"journal":{"name":"Proceedings of the 1986 IEEE Third Working Conference on Current Measurement","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129067221","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: 16

Intercomparison trials: Near-surface current measurements over the norwegian continental shelf 对比试验:挪威大陆架近地表洋流测量

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158472

A. Jenkins, R. Olsen, S. Christianidis

引用次数: 3

High resolution current profiler 高分辨率电流分析器

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158485

F. Rowe, K. Deines, R. Gordon

引用次数: 15

Preliminary results of four VACM-VMCM DYADS in the upper ocean of the equatorial pacific 赤道太平洋上层四个VACM-VMCM DYADS的初步结果

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158475

D. Halpern

引用次数: 1

Acoustic doppler current profiling from a volunteer commercial ship 一艘志愿商船的声学多普勒电流分析

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158481

D. Cutchin, J. Christensen, R. Knoop, J. Stillman, W. Woodward

引用次数: 4

Doppler acoustic velocity profiling in the arctic 北极的多普勒声速剖面

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158478

R. Pinkel, S. Beck, J. Morison

引用次数: 7

Estimating absolute current velocities by merging shipboard doppler current profiler data with LORAN-C data 将船载多普勒测流仪数据与LORAN-C数据合并估算绝对流速

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158489

C. Trump

引用次数: 5

Space-time analysis of acoustic scintillations in ocean current sensing 海流探测中声闪烁的时空分析

Proceedings of the 1986 IEEE Third Working Conference on Current Measurement Pub Date : 1900-01-01 DOI: 10.1109/CCM.1986.1158484

S. Clifford, D. Farmer

引用次数: 0