ADCP´s Gravity waves data processing with wavelet Matched Phase Method

This work uses data from Acoustic Doppler Current Profiler (ADCP), which form a spatial arrangement (array) of 12 sensors placed near the sea surface, to determine the directional wave spectrum by a new schema for data processing, named Matched Phase Method - MPM, that also utilizes the wavelet Data Analysis with Adaptive Technique (DAAT). The method is inverse and determines the direction of the ocean wave field, in frequency bands, based on the match between the phase observed in the cross-spectrum of different combinations of sensors of the ADCP and the theoretical phase response of each pair of sensors subjected to gravity waves of unit amplitude from different directions (transfer function). The method provides the spreading function directly, without using fitting models. The wavelet approach grants high temporal resolution for selected frequency bins representative of the ocean wave field. The MPM results were consistently robust, showing stability between results from subsequent independent records.