Monitoring ocean currents during the passage of Typhoon Muifa using optical-fiber distributed acoustic sensing

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 m...

Full description

Saved in:
Bibliographic Details
Published in:Nature communications 2024-02, Vol.15 (1), p.1111-1111, Article 1111
Main Authors: Lin, Jianmin, Fang, Sunke, He, Runjing, Tang, Qunshu, Qu, Fengzhong, Wang, Baoshan, Xu, Wen
Format: Article
Language:English
Subjects:
704/4111
704/829/2737
Acoustic noise
Acoustics
Cables
Frequencies
Gravity waves
Humanities and Social Sciences
Microseisms
Monitoring
multidisciplinary
New technology
Ocean currents
Ocean surface
Ocean waves
Science
Science (multidisciplinary)
Sea currents
Sea states
Submarine cables
Typhoons
Wave propagation
Wavelengths
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-45412-x