基于三维荧光-平行因子分析和自组织神经网络分析汛期上游来水对新汴河上覆水影响

Evaluating the influence of upstream inflow in flood season on the overlying water of the Xinbian River based on EEM-PARAFAC and SOM

为探究汛期上游来水对新汴河上覆水水质影响,利用三维荧光-平行因子分析(EEMPARAFAC)及自组织神经网络(SOM)分析上游来水前后新汴河上覆水水质参数、溶解性有机质(DOM)的变化.结果表明:(1)汛期上游来水后CODCr和CODMn显著升高(P<0.01),而总氮(TN)的含量却显著降低(P<0.05),表明新汴河汛期上游来水中含有大量有机物;(2)基于EEMPARAFAC解析出3种荧光组分,C1和C2为类腐殖质组分、C3为类蛋白质组分,上游来水后类蛋白质组分(C3)的含量显著提升(P<0.05),表明汛期上游来水中C3的含量相对较高;(3)SOM分析结果表明:新汴河汛期水质可能与城镇生活污水排放及城市地表径流有关;(4)新汴河上覆水中DOM受控于内源及陆源的共同作用,但汛期上游来水后新汴河上覆水DOM陆源性特征更加明显.本研究探究了典型平原地区河流(新汴河)受汛期来水影响下水质及DOM的变化,以期为新汴河水环境管理方案的制订提供科学依据.

To explore the impact of upstream water in flood season on the water quality of the Xinbian River.The fluorescence emission excitation matrix combined with parallel factor analysis(EEM-PARAFAC)and self-organizing map(SOM)were used to analyze the changes in water quality parameters and dissolved organic matter(DOM)before and after upstream inflow.The results showed that:(1)CODCr and CODMn increased significantly(P<0.01)after the upstream inflow in the flood season,while the content of Total Nitrogen(TN)decreased significantly(P<0.05),indicating that the inflow water from the upstream of the Xinbian River during the flood season contained a large amount of organic matter;(2)Based on the EEM-PARAFAC analysis,three fluorescent components were analyzed,suggesting that C1 and C2 were humic-like components,and C3 was a protein-like component.The content of C3 in the upstream inflow water during the flood season was relatively high;(3)SOM analysis results show that:the water quality of the Xinbian River during flood season may be related to urban domestic sewage discharge and urban surface runoff;(4)DOM in the overlying water of Xinbian River was controlled by the combined effect of endogenous and terrestrial sources.However,the terrigenous characteristics of DOM in the overlying water of the Xinbian River were significant after the upper reaches of the flood season.This study explored the changes in water quality and DOM of the Xinbian River in a typical plain area under the influence of inflow during the flood season to provide a scientific basis for the formulation of the water environment management plan for the Xinbian River.