Abstract
Fourier spectral methods have been widely applied to coastal zone current measurements. However in cases such as riverine tides or estuarine outflow currents exhibit non-stationary characteristics which invalidate the basic assumptions of these methods. Wavelet analysis techniques can be used to determine the temporal evolution of current variance over a range of frequency scales and therefore can provide an improved understanding of event-driven dynamics. Morlet continuous-wavelet transforms were applied to multiple vector time-series measurements from a High Frequency (HF) Doppler radar and moored ADCPs near the mouth of Chesapeake Bay in 1996 and 1997 as well as wind measurements at the Chesapeake Light tower. The time-varying clockwise (CW) and counter-clockwise (CCW) wavelet spectra were computed from each vector time-series. The horizontal, vertical and temporal evolution of high energy scales could then be visualized. Significant short-term intensifications of 30-60 hour CW energy in the region of the outfall plume were observed that were highly coherent with local wind forcing.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of the IEEE Working Conference on Current Measurement |
| Publisher | IEEE |
| Pages | 19-24 |
| Number of pages | 6 |
| State | Published - 1999 |
| Event | Proceedings of the 1999 IEEE 6th Working Conference on Current Measurement - San Diego, CA, USA Duration: Mar 11 1999 → Mar 13 1999 |
Other
| Other | Proceedings of the 1999 IEEE 6th Working Conference on Current Measurement |
|---|---|
| City | San Diego, CA, USA |
| Period | 3/11/99 → 3/13/99 |
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ASJC Scopus subject areas
- Instrumentation
Cite this
Wavelet analysis of surface current vector fields measured by high frequency Doppler radar. / Haus, Brian K; Graber, Hans C; Shay, Lynn K.
Proceedings of the IEEE Working Conference on Current Measurement. IEEE, 1999. p. 19-24.Research output: Chapter in Book/Report/Conference proceeding › Chapter
}
TY - CHAP
T1 - Wavelet analysis of surface current vector fields measured by high frequency Doppler radar
AU - Haus, Brian K
AU - Graber, Hans C
AU - Shay, Lynn K
PY - 1999
Y1 - 1999
N2 - Fourier spectral methods have been widely applied to coastal zone current measurements. However in cases such as riverine tides or estuarine outflow currents exhibit non-stationary characteristics which invalidate the basic assumptions of these methods. Wavelet analysis techniques can be used to determine the temporal evolution of current variance over a range of frequency scales and therefore can provide an improved understanding of event-driven dynamics. Morlet continuous-wavelet transforms were applied to multiple vector time-series measurements from a High Frequency (HF) Doppler radar and moored ADCPs near the mouth of Chesapeake Bay in 1996 and 1997 as well as wind measurements at the Chesapeake Light tower. The time-varying clockwise (CW) and counter-clockwise (CCW) wavelet spectra were computed from each vector time-series. The horizontal, vertical and temporal evolution of high energy scales could then be visualized. Significant short-term intensifications of 30-60 hour CW energy in the region of the outfall plume were observed that were highly coherent with local wind forcing.
AB - Fourier spectral methods have been widely applied to coastal zone current measurements. However in cases such as riverine tides or estuarine outflow currents exhibit non-stationary characteristics which invalidate the basic assumptions of these methods. Wavelet analysis techniques can be used to determine the temporal evolution of current variance over a range of frequency scales and therefore can provide an improved understanding of event-driven dynamics. Morlet continuous-wavelet transforms were applied to multiple vector time-series measurements from a High Frequency (HF) Doppler radar and moored ADCPs near the mouth of Chesapeake Bay in 1996 and 1997 as well as wind measurements at the Chesapeake Light tower. The time-varying clockwise (CW) and counter-clockwise (CCW) wavelet spectra were computed from each vector time-series. The horizontal, vertical and temporal evolution of high energy scales could then be visualized. Significant short-term intensifications of 30-60 hour CW energy in the region of the outfall plume were observed that were highly coherent with local wind forcing.
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M3 - Chapter
AN - SCOPUS:0032654169
SP - 19
EP - 24
BT - Proceedings of the IEEE Working Conference on Current Measurement
PB - IEEE
ER -