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Mapping Current Fields in a Bay Using a Coast-Fitting Tomographic Inversion.

Minmo Chen1, Ze-Nan Zhu1, Chuanzheng Zhang1

  • 1State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China.

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|January 24, 2020
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Summary
This summary is machine-generated.

A new coast-fitting tomographic inversion method accurately reconstructs current fields using acoustic tomography data. This advanced technique improves accuracy in coastal and peripheral regions, outperforming conventional methods.

Keywords:
coast-fitting tomographic inversioncoastal acoustic tomographycurrent-field mappingnet volume transportresidual currentsemidiurnal tidal current

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Area of Science:

  • Oceanography
  • Acoustic Tomography
  • Geophysics

Background:

  • Coastal acoustic tomography (CAT) is crucial for understanding ocean currents.
  • Conventional inversion methods struggle with accuracy in near-coastal and peripheral regions.
  • Accurate current field reconstruction is vital for marine environmental monitoring and management.

Purpose of the Study:

  • To develop and validate a novel coast-fitting tomographic inversion method.
  • To enhance the reconstruction accuracy of current fields from CAT data, especially in complex coastal areas.
  • To compare the performance of the new method against conventional techniques.

Main Methods:

  • Function expansion using three normal modes (Dirichlet, Neumann, open boundary) for inversion.
  • Application of the method to Coastal Acoustic Tomography (CAT) data from Dalian Bay (2015).
  • Validation through comparison with CAT-observed currents and calculation of error velocities.

Main Results:

  • Accurate reconstruction of semidiurnal tidal and residual current fields across the entire Dalian Bay domain.
  • Superior performance in peripheral and near-coast regions compared to conventional Fourier series methods.
  • Low error velocities: 2.2 cm/s for semidiurnal tidal currents and 0.9 cm/s for residual currents.

Conclusions:

  • The proposed coast-fitting tomographic inversion method is effective and accurate for reconstructing current fields.
  • The method significantly improves upon conventional techniques, particularly in challenging coastal environments.
  • This advancement offers enhanced capabilities for ocean current monitoring and analysis in coastal zones.