@article{fdi:010088087,
  title = {{M}onitoring deep sea currents with seafloor distributed acoustic sensing},
  author = {{F}lores, {D}. {M}. and {S}laden, {A}. and {A}mpuero, {J}ean-{P}aul and {M}ercerat, {E}. {D}. and {R}ivet, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{U}nderwater fiber optic cables commonly traverse a variety of seafloor conditions, which leads to an uneven mechanical coupling between the cable and the ocean bottom. {O}n rough seafloor bathymetry, some cable portions might be suspended and thus susceptible to vortex-induced vibrations ({VIV}) driven by deep ocean currents. {H}ere, we examine the potential of distributed acoustic sensing ({DAS}) to monitor deep-sea currents along suspended sections of underwater telecom fiber optic cables undergoing {VIV}. {O}scillations of a seafloor fiber optic cable located in southern {F}rance are recorded by {DAS} along cable sections presumably hanging. {T}heir characteristic frequencies are lower than 1 {H}z, at different ocean depths, and have an amplitude-dependency consistent with the driving mechanism being {VIV}. {B}ased on a theoretical proportionality between current speed and {VIV} frequencies, we derive ocean current speed time series at 2,390 m depth from the vortex shedding frequencies recorded by {DAS}. {T}he {DAS}-derived current speed time series is in agreement with recordings by a current meter located 3.75 km away from the hanging cable section (similar dominant period, high correlation after time shift). {T}he {DAS}-derived current speed time series displays features, such as characteristic periods and spectral decay, associated with the generation of internal gravity waves and weak oceanic turbulence in the {M}editerranean {S}ea. {T}he results demonstrate the potential of {DAS} along hanging segments of fiber optic cables to monitor a wide range of oceanography processes, at depths barely studied with current instrumentation.},
  keywords = {},
  booktitle = {},
  journal = {{E}arth and {S}pace {S}cience},
  volume = {10},
  numero = {6},
  pages = {e2022{EA}002723 [13 ]},
  year = {2023},
  DOI = {10.1029/2022ea002723},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088087},
}