太湖下游河网区水质变化特征与引水调控效果  

Characteristics of water quality change in the downstream river network area of Taihu Lake and effect of water diversion control

作　　者：张伊佳 陈星[1] 许钦[2] 李慧敏 许钊 李炳峰 ZHANG Yijia;CHEN Xing;XU Qin;LI Huimin;XU Zhao;LI Bingfeng(College of Hydrology and Water Resources,Hohai University,Nanjing,210098,China;Hydrology and Water Resources Department,Nanjing Hydraulic Research Institute,Nanjing,210029,China;China Water Rights Exchange Co.,Ltd,Beijing,100053,China)

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]南京水利科学研究院水文水资源研究所,江苏南京210029 [3]中国水权交易所股份有限公司,北京100053

出　　处：《水资源保护》2020年第5期79-86,共8页Water Resources Protection

基　　金：“十三五”国家重点研发计划(2018YFC0407704);国家自然科学基金(51879163,51579148,51779146)。

摘　　要：为探究复杂水文水动力条件及污染来源区域的引水调控效果,选取太湖下游河网区29个断面2007—2018年NH3-N和CODMn逐月监测数据,采用单因子评价法、综合污染指数法、聚类分析法、Pearson相关分析法以及单因素方差法进行分析。结果表明,研究区水质情况在时间上可分为两个阶段,2015年为水质整体转好的拐点;空间上可分为6类断面,距离引水口较近的断面改善效果较好,引水改善范围逐年扩大;不同水质指标对引水量的响应情况不同,NH3-N在距离引水口较近的断面与引水量呈显著负相关关系,而CODMn与引水量呈显著负相关关系的断面更多;不同引水量对水质指标的影响存在空间差异,综合得出引水量为2.0亿~2.5亿m^3时对水质的改善效果最优。To explore the water diversion control effect in complex hydro-hydrodynamic conditions and polluted source areas,the downstream river network area in Taihu Lake Basin was selected as the research object.Based on the monthly monitoring datas of NH3-N and CODMn in 29 sections of the study area from 2007 to 2018,single-factor evaluation method,comprehensive pollution index method,cluster analysis method,Pearson correlation analysis and one-way ANOVA were used for analysis.The results show that the water quality in the study area can be divided into two periods in terms of time with 2015 being the inflection point for the overall improvement of water quality.Sections can be divided into six categories in terms of space,with the section closer to the water intake having a better improvement effect and the scope of improvement expanding by water diversion year by year.Different water quality indicators have different responses to water diversion quantity with NH3-N significantly negatively correlated with water diversion quantity in the section closer to the water intake,while in more sections,CODMn has negative correlation with water diversion quantity.There are spatial differences in the influence of different water diversion quantities on the water quality index.It is concluded that when the water diversion quantity is 200 million-250 million m^3,the improvement effect of water quality is the best.

关 键 词：平原河网区 水质 时空分布 引水调控 最优引水量 太湖 

分 类 号：TV213.4[水利工程—水文学及水资源] X171[环境科学与工程—环境科学]