Water quality characteristics and pollution source analysis of Qinhuai River during rainstorm events
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..
万方数据
维普
