Spectral analysis of some selected hydrochemical parameter of diyala river

Abstract EN

Some selected hydrochemical parameters of Diyala river including electrical conductivity (EC), Ca+2, Mg+2, SO-24 , CI-1, HCO-13, total soluble solids (T.S.S.), discharge (Ǫ) and total hardness (TH) were analyzed for their periodicities using monthly measurements for the period 1993-1997, to quantify and qualify surface water and investigate the periodicity behavior of these parameters.

Results showed significant autocorrelation for all the studied series and therefore they were subjected to the Spectral (Fourier) analysis to investigate the main periodicities that contribute to the total variance of the observed data.

Most of the selected parameters have strong (less frequent) semi-annual and biannual cycle, as well as seasonal cycle for, Cl, Mg, Ca, SO4, HCO3 ,TSS , and EC.

These results reveal the variation of the factors affecting the river water quality including hydrological and meteorological conditions as well as the impact of human activities through the river catchments river.