Spectral Analysis of Some Selected Hydrochemical Parameter Of Diyala River


Some selected hydrochemical parameters of Diyala river including electricalconductivity (EC), 132 14Ca+2 ,Mg+2 ,SO- ,Cl - ,HCO- , total soluble solids (T.S.S.),discharge (Q) and total hardness(TH) were analyzed for their periodicities using monthlymeasurements for the period 1993-1997, to quantify and qualify surface water andinvestigate the periodicity behavior of these parameters. Results showed significantautocorrelation for all the studied series and therefore they were subjected to the Spectral(Fourier) analysis to investigate the main periodicities that contribute to the totalvariance of the observed data. Most of the selected parameters have strong (lessfrequent) 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 riverwater quality including hydrological and meteorological conditions as well as the impactof human activities through the river catchments river.