A Grey Correlation Analysis between δ~(18)O and Water Quality Indexes in the Upper Reaches of the Huangpu River

During the experiment of diverting water from the Taipu River from March 22 to April 6 in 2006,synchronous isotope monitoring for water quantity and water quality was carried out.Combining water quality and isotope data,a grey correlation analysis has been made between major water quality indexes and δ18O values during sluice-supply water period and the pump-supply water period.The correlation sequence of water quality indexes and δ18O variation was CODMnTPCODCrTNDONH3-N during the period of sluice-supply water,and that of water quality indexes and δ18O variation was CODMnTNCODCrDOTPNH3-N during the period of pump-supply water.Of the two different diverting methods,CODMn is in the first place in the sequence of correlation and NH3-N is in the last place in the sequence.Correlation degrees of TP and TN change obviously from sluice-supply water period to pump-supply water period.Furthermore,all the correlation degrees except TP during sluice-supply water period are higher than those during the pump-supply water period.Results show that pump-supply water have more obvious influence on the correlation degree.The value of CODMn,CODCr,TP and TN had high correlation with the value of δ18O during the two periods.