摘要
基于2015年—2019年嘉兴市区河道水质及降水量历史资料,运用Mann-Kendall等数理统计方法分析河道水质变化规律及其影响因素。结果表明:CODMn、CODCr、BOD5、NH3-N和TP浓度大部分时间能达到地表水Ⅲ类标准;9个省市控断面中,石臼漾水厂的水质较好,位于市区下游的北运桥和人中浜断面的水质相对较差;5年中河道水质呈极显著的改善趋势,其中,CODMn和NH3-N浓度的改善效果最为明显;嘉兴市及整个杭嘉湖区域的河道水环境治理取得了良好的成效,但市区仍存在一定的污染源;市区河道水质浓度与上游来水水质浓度呈极显著正相关,表明受上游来水的影响很大;河道水质浓度对降水呈现出复杂的响应特征,表明不同水质指标的主要影响因素及污染来源有所不同。
Based on the precipitation and water quality monitoring data in Jiaxing City during the period of 2015 to 2019,the change pattern of water quality in the urban rivers and its influencing factors were analyzed by various statistical methods such as Mann-Kendall test.Results showed that the 5 water quality constituents(CODMn,CODMn,BOD5,NH3-N and TP)generally reached ClassⅢof the surface water quality standard.Among the all 9 monitoring stations,water quality was the best at Shijiuyang Waterworks and was relatively low at Beiyunqiao and Renzhongbang,both of which are located at the downstream of the city.The river water quality showed a significant improvement trend with CODMn and NH3-N.The results also indicated that significant achievement was made in water environment management in Jiaxing City as well as in the entire Hangjiahu Area,though significant pollution sources still existed in Jiaxing City.The water quality of urban rivers was greatly affected by the upstream inflow,as there was a very significant positive correlation between them.The complex response of different river water quality constituents to the precipitation implied that the main influencing factors and pollution sources were different for different constituents.
作者
娄孝飞
王颖
张海军
张海平
LOU Xiaofei;WANG Ying;ZHANG Haijun;ZHANG Haiping(College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Danhua Water Resources&Environment Technology〈Shanghai〉Company,Shanghai 200235,China;Water Resources&Hydroelectric Prospecting&Design Research Institute of Jiaxing City,Jiaxing 314001,China)
出处
《净水技术》
CAS
2020年第6期67-72,82,共7页
Water Purification Technology
基金
国家水体污染控制与治理科技重大专项(2017ZX07206-001)
“水体污染控制与治理”科技重大专项成果
嘉兴市水污染协调控制与水源地质量改善项目
区域水环境质量改善综合调控系统与平台建设课题。
