2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM)最新文献_第3页

High Resolution Doppler profiler measurements of turbulence from a profiling body 高分辨率多普勒剖面仪对剖面体湍流的测量

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759562

P. Rusello, E. Siegel, M. Alford

引用次数: 5

Performance of the nortek Aquadopp Z-Cell Profiler on a NOAA surface buoy nortek Aquadopp Z-Cell剖面仪在NOAA海面浮标上的性能

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759554

E. Siegel, R. Riley, K. Grissom

{"title":"Performance of the nortek Aquadopp Z-Cell Profiler on a NOAA surface buoy","authors":"E. Siegel, R. Riley, K. Grissom","doi":"10.1109/CWTM.2011.5759554","DOIUrl":"https://doi.org/10.1109/CWTM.2011.5759554","url":null,"abstract":"Observations of current velocity in near-surface and near-bottom boundary layers are critically important for many scientific, operational, and engineering applications. Nortek developed the Aquadopp Z-Cell Profiler, a dual-frequency, six-beam acoustic Doppler current profiler, to meet the needs of observing the complete water column velocity profile, including the near-surface or near-bottom currents. The Aquadopp Z-Cell Profiler employs three acoustic beams directed horizontally and spaced equally around the circumference of the profiler with 120 deg spacing between the beams. These beams measure the two-component horizontal currents at the level of the instrument (cell zero), thereby eliminating the common blanking distance associated with standard ADCP's. Near-surface and water column current velocity profile observations from a Z-Cell Profiler mounted on a NOAA NDBC 3 m discus buoy (located in the northern Gulf of Mexico) are compared with current velocity profile measurements from a bottom mounted 600 kHz Nortek AWAC and 600 kHz Teledyne RD Instruments Workhorse acoustic Doppler current profiler. A tidal analysis suggests that velocity data from the horizontal beams (cell zero) are of good quality and consistent in direction and magnitude with the velocity measurements in cells below, with the AWAC and Workhorse velocity, and with theory. Several cases are presented that indicate the measurements in cell zero are important to make independent of velocity lower in the water column in order to correctly characterize the flow regime. Current speed and direction differences between cell zero and lower cells project a horizontal spatial separation of water parcels as much as 20 km/day, with a mean separation of 8.5 km/day.","PeriodicalId":345178,"journal":{"name":"2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM)","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115924053","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

Error assessment of HF radar-based ocean current measurements: An error model based on sub-period measurement variance 高频雷达海流测量误差评估:基于子周期测量方差的误差模型

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759527

K. Laws, J. Vesecky, J. Paduan

{"title":"Error assessment of HF radar-based ocean current measurements: An error model based on sub-period measurement variance","authors":"K. Laws, J. Vesecky, J. Paduan","doi":"10.1109/CWTM.2011.5759527","DOIUrl":"https://doi.org/10.1109/CWTM.2011.5759527","url":null,"abstract":"Data from CODAR-type ocean current sensing radar systems are used here to evaluate the performance of an error indicator provided as part of the available radar data. Investigations are based on data from pairs of radar systems with over-water baselines. Approximately year-long time series are used. The radar data are the typical hourly radial measurements provided by CODAR systems. These measurements are actually the median (or mean) of anywhere between 2 and 7 sub-hourly measurements collected by the radar system. The error indicator under examination is based on the standard deviation (std) of the sub-hourly radials, divided by the square root of the number of sub-hourly radials. These values are recorded in the hourly data files produced by recent versions of the CODAR data processing software. Examination of the model demonstrates a positive correlation between the model and the measured baseline difference std for all baseline pairs examined. The predictive capability of the error model is demonstrated by presenting its use as a data discriminator and by examination of time series of sliding boxcar samples of radar data. Baseline difference std for data rejected by a threshold based on the error model is shown to be significantly higher than for the data retained. The results presented here demonstrate potential to improve assessment of the HF radar current measurement uncertainty. Such improvement has potential to benefit all applications of HF radar data, including for example, Lagrangian particle tracking and surface current assimilation into numerical models.","PeriodicalId":345178,"journal":{"name":"2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123676120","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: 7

Spar buoy platform for water wave, turbulence and underwater electric field sensors 用于水波、湍流和水下电场传感器的浮筒平台

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759551

C. Bradley, W. Venezia

引用次数: 1

Horizontal ADCP measurements of waves and currents in the very nearshore 水平ADCP测量的波浪和水流在非常近的海岸

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759545

M. D. de Schipper, R.C. de Zeeuw, S. de Vries, M. Stive, J. Terwindt

引用次数: 7

Noise in Ice-Tethered Profiler and McLane Moored Profiler velocity measurements 冰系剖面仪和McLane系泊剖面仪速度测量中的噪声

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759553

F. Thwaites, R. Krishfield, M. Timmermans, J. Toole, A. Williams

引用次数: 6

Coherent marine radar mapping of ocean surface currents and directional wave spectra 海洋表面流和定向波谱的相干海洋雷达制图

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-20 DOI: 10.1109/CWTM.2011.5759526

D. Trizna

引用次数: 2

Field testing of a new ADCP 新型ADCP的现场测试

2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM) Pub Date : 2011-03-01 DOI: 10.1109/CWTM.2011.5759531

J. Mullison, P. Wanis, D. Symonds

{"title":"Field testing of a new ADCP","authors":"J. Mullison, P. Wanis, D. Symonds","doi":"10.1109/CWTM.2011.5759531","DOIUrl":"https://doi.org/10.1109/CWTM.2011.5759531","url":null,"abstract":"Since its introduction in 1992, the Teledyne RDI Instruments (TRDI) Workhorse ADCP has become ubiquitous, with literally thousands of systems deployed in nearly every body of water on earth. While the measurement itself remains relatively unchanged, in the intervening years the use of the measurements has changed to an extraordinary extent. Originally a novel way to measure currents sorely in need of proving and acceptance by the research community, ADCP measurements are now the de facto standard for current measurement. What began as a useful tool for academic research continues in that role, but has also become standard equipment for real time decision making. ADCPs are now routinely used to measure river discharge and to aid flood control engineers in managing river levels. Since a terrible accident occurred in Tampa Bay, ADCPs now provide current information in near real-time to the pilots and captains of large vessels as they ply many of the world's major ports and waterways. Because offshore platforms cannot safely operate in the large currents of the Gulf of Mexico's Loop Current and the Eddies it generates, ADCPs play a critical role on all offshore platforms in the deep Gulf of Mexico. The presence and trajectories of these high Gulf of Mexico currents are forecast with great accuracy, the ADCPs real utility comes in determining when they are no longer affecting the rig. ADCPs provide information on an hourly basis in near real time from the TAO/TRITON array for climate forecasting. Returned Signal Strength Intensity data, originally provided strictly as an ancillary quality control parameter, has developed into a useful tool for studies as diverse as the diel migration of zooplankton to aid in creating optimal harbor designs based on sediment transport patterns in the area.","PeriodicalId":345178,"journal":{"name":"2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132583241","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