NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait
Three cruises with shipboard Acoustic Doppler Current Profiler (ADCP) were performed along a transect across the Peng-hu Channel (PHC) in the Taiwan Strait during 2003 - 2004 in order to investigate the feasibility and accuracy of the phase-averaging method to eliminate tidal components from shipboa...
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| Format: | Article |
| Language: | English |
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Springer
2008-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
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| Online Access: |
http://tao.cgu.org.tw/images/attachments/v194p433.pdf
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| _version_ | 1828330933713895424 |
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| author | Yu-Chia Chang Ruo-Shan Tseng Cho-Teng Liu |
| author_facet | Yu-Chia Chang Ruo-Shan Tseng Cho-Teng Liu |
| author_sort | Yu-Chia Chang |
| collection | DOAJ |
| description | Three cruises with shipboard Acoustic Doppler Current Profiler (ADCP) were performed along a transect across the Peng-hu Channel (PHC) in the Taiwan Strait during 2003 - 2004 in order to investigate the feasibility and accuracy of the phase-averaging method to eliminate tidal components from shipboard ADCP measurement of currents. In each cruise measurement was repeated a number of times along the transect with a specified time lag of either 5, 6.21, or 8 hr, and the repeated data at the same location were averaged to eliminate the tidal currents; this is the so-called ¡§phase-averaging method¡¨. We employed 5-phase-averaging, 4-phase-averaging, 3-phase-averaging, and 2-phase-averaging methods in this study. The residual currents and volume transport of the PHC derived from various phase-averaging methods were intercompared and were also compared with results of the least-square harmonic reduction method proposed by Simpson et al. (1990) and the least-square interpolation method using Gaussian function (Wang et al. 2004). The estimated uncertainty of the residual flow through the PHC derived from the 5-phase-averaging, 4-phase-averaging, 3-phase-averaging, and 2-phase-averaging methods is 0.3, 0.3, 1.3, and 4.6 cm s-1, respectively. Procedures for choosing a best phase average method to remove tidal currents in any particular region are also suggested. |
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| format | Article |
| id | doaj.art-224290a1276c4789b4f7adf9a2f6126e |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-04-13T20:46:55Z |
| publishDate | 2008-01-01 |
| publisher | Springer |
| record_format | Article |
| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-224290a1276c4789b4f7adf9a2f6126e2022-12-22T02:30:39ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802008-01-0119443310.3319/TAO.2008.19.4.433(Oc)NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan StraitYu-Chia ChangRuo-Shan TsengCho-Teng LiuThree cruises with shipboard Acoustic Doppler Current Profiler (ADCP) were performed along a transect across the Peng-hu Channel (PHC) in the Taiwan Strait during 2003 - 2004 in order to investigate the feasibility and accuracy of the phase-averaging method to eliminate tidal components from shipboard ADCP measurement of currents. In each cruise measurement was repeated a number of times along the transect with a specified time lag of either 5, 6.21, or 8 hr, and the repeated data at the same location were averaged to eliminate the tidal currents; this is the so-called ¡§phase-averaging method¡¨. We employed 5-phase-averaging, 4-phase-averaging, 3-phase-averaging, and 2-phase-averaging methods in this study. The residual currents and volume transport of the PHC derived from various phase-averaging methods were intercompared and were also compared with results of the least-square harmonic reduction method proposed by Simpson et al. (1990) and the least-square interpolation method using Gaussian function (Wang et al. 2004). The estimated uncertainty of the residual flow through the PHC derived from the 5-phase-averaging, 4-phase-averaging, 3-phase-averaging, and 2-phase-averaging methods is 0.3, 0.3, 1.3, and 4.6 cm s-1, respectively. Procedures for choosing a best phase average method to remove tidal currents in any particular region are also suggested. http://tao.cgu.org.tw/images/attachments/v194p433.pdf Tidal currentPhase-averaging methodShipboard ADCPResidual flow |
| spellingShingle | Yu-Chia Chang Ruo-Shan Tseng Cho-Teng Liu NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait Terrestrial, Atmospheric and Oceanic Sciences Tidal current Phase-averaging method Shipboard ADCP Residual flow |
| title | NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait |
| title_full | NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait |
| title_fullStr | NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait |
| title_full_unstemmed | NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait |
| title_short | NOTES AND CORRESPONDENCE Evaluation of Tidal Removal Method Using Phase Average Technique from ADCP Surveys along the Peng-Hu Channel in the Taiwan Strait |
| title_sort | notes and correspondence evaluation of tidal removal method using phase average technique from adcp surveys along the peng hu channel in the taiwan strait |
| topic | Tidal current Phase-averaging method Shipboard ADCP Residual flow |
| url |
http://tao.cgu.org.tw/images/attachments/v194p433.pdf
|
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