The Effect of Rainfall Parameters on Runoff Using Wavelet Coherence Measure

In this research wavelet coherence measure is implemented for evaluating the relations and effect of rainfall parameters over many years on runoff fluctuations that is for testing proposed linkages between two time series. In this way, monthly Hydro climatological as 3 rainfall stations, one runoff in the outlet of Ardabil plain were used. The results illustrate that 8-12 and 8-16 month modes of variability were seen in most strongly in precipitation. The significance of shared 8-16 month periodicity with 95% confidence in runoff time series was confirmed through continuous wavelet transform and Wavelet Power Spectrum graphs. The results of wavelet coherence and cross wavelet transform showed that 8-16 month had between rainfall and runoff. Also, wavelet transform coherence and cross wavelet transform graphs showed 8-16 month periodicity was conceded as between rainfall and runoff parameters.