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Construction of sea surface current vectors using a single HF radar: A theoretical study
Junqiang Shi1, Xueen Chen2, Xue Li3
1Institute of Oceanographic Instrumentation, Qilu University of Technology (Shandong Academy of Sciences), Qingdao 266100, P. R. China.
Iscience
|December 30, 2022
Summary
A new Stream and Potential Function Method (SPFM) accurately retrieves sea surface currents using one high-frequency (HF) radar. This hydrodynamic approach improves upon the stream function method (SFM) for ocean current analysis.
Area of Science:
- Oceanography
- Fluid Dynamics
- Remote Sensing
Background:
- High-frequency (HF) radar is crucial for monitoring ocean surface currents.
- Existing methods often require multiple radar units or lack comprehensive hydrodynamic integration.
- Accurate sea surface current data is vital for marine navigation, weather forecasting, and ecological studies.
Purpose of the Study:
- To introduce and validate a novel method, the Stream and Potential Function Method (SPFM), for retrieving sea surface current vector fields.
- To enhance the accuracy and reliability of current retrieval using a single HF radar.
- To integrate hydrodynamic constraints and a 2D ocean current model for improved current field estimation.
Main Methods:
- Developed the Stream and Potential Function Method (SPFM) by decomposing the current vector field into nondivergent vortex flow and irrotational divergent flow.
- Incorporated hydrodynamic constraints and a two-dimensional (2D) ocean current model within the SPFM framework.
- Utilized radial-component measurements from a single high-frequency (HF) radar for current vector field estimation.
Main Results:
- SPFM successfully retrieves the sea surface current vector field using data from a single HF radar.
- The method effectively captures the spatiotemporal distribution characteristics of the current vector field.
- Evaluation against the HYCOM surface current dataset demonstrated SPFM's superior reliability compared to the traditional Stream Function Method (SFM).
Conclusions:
- The Stream and Potential Function Method (SPFM) offers a more reliable and physically consistent approach for deriving sea surface currents from single HF radar measurements.
- SPFM's ability to consider both stream and potential functions enhances the accuracy of ocean current vector field retrieval.
- This advancement provides a valuable tool for oceanographic research and operational applications requiring precise sea surface current data.
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