WAVELET ANALYSIS FOR TIDAL GAUGES INCLUDING TSUNAMI DATA

The separation of tidal from non-tidal contents in tide gauge records are in general done by designing high pass or band pass filtering techniques. However, there is always a tradeoff between losing some valuable contents of the signal while trying to remove the tide. In this work, wavelet decomposition technique was applied as a tool to minimize the influence of tidal contents. Several parameters were set and applied to several types of wavelets in various temporal series and frequency ranges for two tidal gauges including tsunami data. The goal was to find the most appropriate wavelet parameter and type, to distinguish tsunami data from tidal contents. Our results show that the application of wavelets in comparison to conventional methods yields to lesser RMS errors before the arrival of the tsunami wave and therefore produces minor data loss after applying. The procedure introduced can be applied at any tide gauge data for tidal analysis with wavelet decomposition techniques.

کلیدواژه ها:

Wavelet ، Tide ، Tsunami