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Free-dropping acoustic Doppler current profiler observation and data processing
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Yong Mou1, Chujin Liang1, 2, 3, *, Feilong Lin1, Zijian Cui3
Haiyang Xuebao | 2023, 45(4) : 144 - 153
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Haiyang Xuebao | 2023, 45(4): 144-153
• Article •
Free-dropping acoustic Doppler current profiler observation and data processing
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Yong Mou1, Chujin Liang1, 2, 3, *, Feilong Lin1, Zijian Cui3
Affiliations
  • 1State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  • 2School of Ocean Science, Nanjing University of Information and Technology, Nanjing 210044, China
  • 3School of Ocean Science, Zhejiang University, Hangzhou 310058, China
Published: 2023-03-31 doi: 10.12284/hyxb2023047
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The free-dropping acoustic Doppler current profile (FADCP) samples in a “free-fall” manner, which can observe the full depth current without relying on the cable traction of the ship, and its stability is greatly improved compared with lowered acoustic doppler current profiler (LADCP), effectively reducing the irregular motion in the observations. The FADCP observation experiments conducted in April and September 2021 at Xisha waters in the South China Sea obtained current and CTD data from two sections containing 16 stations. Based on the real bottom current observation during the resting period, the full-depth current profiles at each station were obtained by shear method, and the average deviation of the station profile near a mooring compared with the mooring profile was 3 cm/s. The observation section captured the cyclonic eddies of two periods at Xisha waters with more precise vertical structures than the HYCOM simulation, and the surface flows fitted with the absolute geostrophic currents. This research shows that the FADCP has low vessel requirements, high data quality, easy post-processing and good results, but cannot perform supplementary observations for specific water layers.

FADCP  /  LADCP  /  shear method
Yong Mou, Chujin Liang, Feilong Lin, Zijian Cui. Free-dropping acoustic Doppler current profiler observation and data processing[J]. Haiyang Xuebao, 2023 , 45 (4) : 144 -153 . DOI: 10.12284/hyxb2023047
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Year 2023 volume 45 Issue 4
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Article Info
doi: 10.12284/hyxb2023047
  • Receive Date：2022-09-14
  • Online Date：2025-12-26
  • Published：2023-03-31
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History
  • Received：2022-09-14
  • Revised：2022-10-25
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Affiliations
    1State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
    2School of Ocean Science, Nanjing University of Information and Technology, Nanjing 210044, China
    3School of Ocean Science, Zhejiang University, Hangzhou 310058, China
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