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- Title
Monitoring ocean currents during the passage of Typhoon Muifa using optical-fiber distributed acoustic sensing.
- Authors
Lin, Jianmin; Fang, Sunke; He, Runjing; Tang, Qunshu; Qu, Fengzhong; Wang, Baoshan; Xu, Wen
- Abstract
In situ observations under typhoon conditions are sparse and limited. Distributed acoustic sensing (DAS) is an emerging technology that uses submarine optical-fiber (OF) cables to monitor the sea state. Here, we present DAS-based ocean current observations when a super typhoon passed overhead. The microseismic noise induced by ocean surface gravity waves (OSGWs) during Typhoon Muifa (2022) is observed in the ~0.08–0.38 Hz frequency band, with high-frequency (>0.3 Hz) component being tidally modulated. The OSGW propagation along the entire cable is successfully revealed via frequency–wavenumber analysis. Further, a method based on the current-induced Doppler shifts of DAS-recorded OSGW dispersions is proposed to calculate both speeds and directions of horizontal ocean currents. The measured current is consistent with the tidally induced sea-level fluctuations and sea-surface winds observed at a nearby ocean buoy. These observations demonstrate the feasibility of monitoring the ocean current under typhoon conditions using DAS-instrumented cables. Using microseismic noise observed by distributed acoustic sensing (DAS) with a submarine cable, this study measures the magnitude and direction of ocean currents during the passage of typhoon Muifa and estimates the ocean wave propagation.
- Subjects
OCEAN currents; TYPHOONS; OCEAN waves; DOPPLER effect; GRAVITY waves; TECHNOLOGICAL innovations; THEORY of wave motion; SUBMARINE cables
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-45412-x