Measuring Instantaneous Velocity Fields Remotely using a Two-Dimensional Power Spectral Density Technique
- Naval Research Laboratory , Washington, D.C., USA
A remote method of measuring surface and near-surface currents in wavy riverine environments
at high spatial and temporal resolution is presented. A two-dimensional power spectral density
technique (2D PSD), which is based on calculating the cross-spectrum between two images is
developed and compared with the established 3D PSD technique. In contrast to the 3D PSD
technique, the 2D PSD algorithm is capable of determining velocity time series and spectra,
thereby facilitating remote measurements of turbulence. Moreover, the 2D PSD algorithm can
accurately determine near-surface flows from fewer images. Results are presented from imagery
collected from an unmanned aerial vehicle and satellite imagery from a number of different
riverine locations.
How to cite: Johnson, E.: Measuring Instantaneous Velocity Fields Remotely using a Two-Dimensional Power Spectral Density Technique, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-13487, https://doi.org/10.5194/egusphere-egu22-13487, 2022.
