Determination ofCoherenceandPhaseDifferencebetween Wind versus Current60 mand Current 60 mversusCurrent 100 mUsingCrossCorrelation in OmbaiStrait, East Nusa Tenggara

Abstract

Abstract

 

Data analysis was performed to see coherence and phase difference between the wind versus current 60 m and current 60 m versus current 100 m using cross correlation in Ombai Strait, East Nusa Tenggara. Velocity components U and V of wind and current of wind data and the current were filtered in order to obtain new data on the initial data at any position of t from xt-n  to xt+n. Energy spectrum density of the filter result is determined to examine the fluctuations of wind energy and real currents. Cross-correlation between wind versus current 60 m and current 60 m versus current 100 m is to determine the coherence and the phase difference of the data with the same time interval. Low coherence values in the cross-correlation between the Zonal Wind and the Zonal current at a depth of 60 m indicates that the fluctuations between the Zonal Wind and the zonal current depth of 60 m does not have a strong correlation with the largest coherence value that is 0.55 with a time leg 34 days. With fluctuation current at a depth of 60 m precedes wind fluctuation with a phase difference of 34 days.

Keywords: coherence, phase difference, Ombai Strait