An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage
Seven current meters representing four models were placed for an 11 month deployment on a stiffly buoyed mooring to intercompare their velocity measurements: two VMCMs, two Aanderaa RCM11s, two Aanderaa SEAGUARDSs, and a Nortek Aquadopp. The current meters were placed 6 m apart from each other at ab...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:physical_oceanography_techrpts-1002 2024-09-15T18:03:59+00:00 An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage Kennelly, Maureen A. Watts, D. Randolph Tracey, Karen L. Donohue, Kathleen A. 2012-11-07T08:00:00Z application/pdf https://digitalcommons.uri.edu/physical_oceanography_techrpts/3 https://digitalcommons.uri.edu/context/physical_oceanography_techrpts/article/1002/viewcontent/CM_cookoff_TR.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/physical_oceanography_techrpts/3 https://digitalcommons.uri.edu/context/physical_oceanography_techrpts/article/1002/viewcontent/CM_cookoff_TR.pdf http://creativecommons.org/licenses/by-nc-sa/3.0/ Physical Oceanography Technical Reports current meter comparisions acoustic Doppler current sensors text 2012 ftunivrhodeislan 2024-08-21T00:09:33Z Seven current meters representing four models were placed for an 11 month deployment on a stiffly buoyed mooring to intercompare their velocity measurements: two VMCMs, two Aanderaa RCM11s, two Aanderaa SEAGUARDSs, and a Nortek Aquadopp. The current meters were placed 6 m apart from each other at about 4000 m depth in an area of Drake Passage expected to have strong near-bottom currents, that were nearly independent of depth. Two high-current events occurred in bursts of semi-diurnal pulses lasting several days, one with peak speeds up to 67 cm/s and the other above 35 cm/s. The current speed measurements all agreed within about 5% when vector-averaged over simultaneous time intervals: the full time interval (198 days) when all instruments were working, and the two high-speed events lasting 21 days and 7 days. The VMCMs, chosen as the reference measurements, were found to measure the median of the mean-current magnitudes. The RCM11 and SEAGUARD current speeds had a nearly 1:1 relationship with the median. They agreed within 2% at higher speeds (35-70 cm/s), whereas in lower speed ranges (0-35 cm/s) the vector-averaged speeds for the RCM11s and SEAGUARDS were, respectively, 4-5% lower and 3-5% higher than the median. The Aquadopp current speeds were about 7% higher than the VMCMs over the range (0-40 cm/s) encountered through their shorter common time period. Text Drake Passage University of Rhode Island: DigitalCommons@URI |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
topic |
current meter comparisions acoustic Doppler current sensors |
spellingShingle |
current meter comparisions acoustic Doppler current sensors Kennelly, Maureen A. Watts, D. Randolph Tracey, Karen L. Donohue, Kathleen A. An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage |
topic_facet |
current meter comparisions acoustic Doppler current sensors |
description |
Seven current meters representing four models were placed for an 11 month deployment on a stiffly buoyed mooring to intercompare their velocity measurements: two VMCMs, two Aanderaa RCM11s, two Aanderaa SEAGUARDSs, and a Nortek Aquadopp. The current meters were placed 6 m apart from each other at about 4000 m depth in an area of Drake Passage expected to have strong near-bottom currents, that were nearly independent of depth. Two high-current events occurred in bursts of semi-diurnal pulses lasting several days, one with peak speeds up to 67 cm/s and the other above 35 cm/s. The current speed measurements all agreed within about 5% when vector-averaged over simultaneous time intervals: the full time interval (198 days) when all instruments were working, and the two high-speed events lasting 21 days and 7 days. The VMCMs, chosen as the reference measurements, were found to measure the median of the mean-current magnitudes. The RCM11 and SEAGUARD current speeds had a nearly 1:1 relationship with the median. They agreed within 2% at higher speeds (35-70 cm/s), whereas in lower speed ranges (0-35 cm/s) the vector-averaged speeds for the RCM11s and SEAGUARDS were, respectively, 4-5% lower and 3-5% higher than the median. The Aquadopp current speeds were about 7% higher than the VMCMs over the range (0-40 cm/s) encountered through their shorter common time period. |
format |
Text |
author |
Kennelly, Maureen A. Watts, D. Randolph Tracey, Karen L. Donohue, Kathleen A. |
author_facet |
Kennelly, Maureen A. Watts, D. Randolph Tracey, Karen L. Donohue, Kathleen A. |
author_sort |
Kennelly, Maureen A. |
title |
An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage |
title_short |
An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage |
title_full |
An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage |
title_fullStr |
An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage |
title_full_unstemmed |
An Intercomparison of Four Models of Current Meter in High Current Conditions in Drake Passage |
title_sort |
intercomparison of four models of current meter in high current conditions in drake passage |
publisher |
DigitalCommons@URI |
publishDate |
2012 |
url |
https://digitalcommons.uri.edu/physical_oceanography_techrpts/3 https://digitalcommons.uri.edu/context/physical_oceanography_techrpts/article/1002/viewcontent/CM_cookoff_TR.pdf |
genre |
Drake Passage |
genre_facet |
Drake Passage |
op_source |
Physical Oceanography Technical Reports |
op_relation |
https://digitalcommons.uri.edu/physical_oceanography_techrpts/3 https://digitalcommons.uri.edu/context/physical_oceanography_techrpts/article/1002/viewcontent/CM_cookoff_TR.pdf |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/3.0/ |
_version_ |
1810441465169444864 |