### 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 |

### Fingerprint

### ASJC Scopus subject areas

- Instrumentation

### Cite this

*Proceedings of the IEEE Working Conference on Current Measurement*(pp. 19-24). IEEE.

**Wavelet analysis of surface current vector fields measured by high frequency Doppler radar.** / Haus, Brian K; Graber, Hans C; Shay, Lynn K.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*Proceedings of the IEEE Working Conference on Current Measurement.*IEEE, pp. 19-24, Proceedings of the 1999 IEEE 6th Working Conference on Current Measurement, San Diego, CA, USA, 3/11/99.

}

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.

UR - http://www.scopus.com/inward/record.url?scp=0032654169&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032654169&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:0032654169

SP - 19

EP - 24

BT - Proceedings of the IEEE Working Conference on Current Measurement

PB - IEEE

ER -