Dispersion Degree of Water Quality and Its Influence on the Estimation for Pollutant Fluxs in Qiantang Estuary
To estimate pollutant flux in Qiantang Estuary,the time interval dispersion of the three water quality indi-cators(CODMn,TN,TP),the correlation with the net discharge,and the error caused by ignoring the time averaged dis-crete flux in the estimation of monthly pollutant flux were analyzed,based on the daily water quality data and daily net discharge of Zhijiang Station in 2016.The results show that the monthly variation coefficients of CODMn,TN and TP are 0.06-0.16,0.04-0.21 and 0.12-0.26,respectively,which are far less than the variation coefficients of net discharge of 0.21-0.76;The water quality indicators of CODMn and TP and runoff have no obvious change trend in the same direction,while TN and runoff have a significant change trend in the same direction;The time average dispersion error of the monthly flux of each pollutant is small.If the daily flow and daily water quality data cannot be obtained,the pollutant flux can also be estimated more accurately by using the monthly average flow and water quality data.
NETL
NSTL
万方数据
维普
