To investigate the change of water quality of Qinhuai River before and after rainstorm,identify the pollution source of river,and make statistical analysis of water quality of 5 monitoring sections of Qinhuai River in rainless period and rainstorm period.Box Plot and correlation analysis were used to compare the water quality indicators between no-rain periods and stormy periods.The APCS-MLR and PMF models were applied to estimate the absolute contribution rates of different pollution sources.The results of this research showed that during stormy periods,the concentrations of CODMn,NH4+-N and TN in Qinhuai River were higher than those in no-rain periods,among which NH4+-N had the largest change rate,increasing by 97.78%,while DO concentration was lower than that no-rain periods,decreasing by 40.49%.Compared with no-rain periods,the negative correlation between DO and CODMn,NH4+-N and TN increased during stormy periods,at the meantime the positive correlation between CODMn and NH4+-N and TN were even stronger.Moreover,APCS-MLR and PMF models were used to identify the sources of water pollution in the Qinhuai River during the stormy periods.The results of APCS-MLR showed that the main sources of pollution were internal sources(61.239%),urban runoff(27.287%),point sources(7.739%),and unidentified sources(3.735%).The results of PMF model showed that the contribution rates of river internal pollution,urban non-point pollution and point pollution to the water quality of Qinhuai River were 62.934%,23.489%and 13.577%,respectively.The results of the two models were similar and had high accuracy.The results could provide countermeasures for pollution control of Qinhuai River during rainstorm..
维普
万方数据
