某城市内湖水质评价及污染成因分析  

Water Quality Evaluation and Pollution Causes Analysis for an Urban Lake

作　　者：刘加强 范秀磊[2] 李昂 冯启言[1] 杨成方[2] LIU Jiaqiang;FAN Xiulei;LI Ang;FENG Qiyan;YANG Chengfang(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;School of Environmental Engineering,Xuzhou Institute of Technology,Xuzhou 221111,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]徐州工程学院环境工程学院,江苏徐州221111

出　　处：《净水技术》2020年第11期142-146,共5页Water Purification Technology

基　　金：徐州市重点研发课题(KC19218、KC18148);大学生创新创业训练计划项目(XCX2019158)。

摘　　要：以城市内湖为代表的水体普遍存在氮磷营养盐超标现象,从而导致水体功能恶化、环境健康隐患,水体景观功能受到影响。基于2013年—2018年水质数据,分析了某城市内湖水质年际变化趋势,并根据Spearman相关性原理,建立各湖区与整个湖区的相关关系,采用内梅罗指数法和污染分担率法对湖区水质进行了评价分析。基于2018年8月—2019年7月的水质数据,分析了湖区氮、磷含量的季节性变化规律及污染成因,以期为湖区水环境保护提供科学依据。评价分析结果表明,西湖水质变化与整个湖区水质变化相关性最强,自2015年以来,湖区水质呈现污染加剧的变化趋势,其中,TP、TN在整个污染构成体系中污染最为严重。湖区氮、磷含量的季节性变化规律表明,TN浓度:平水期>丰水期>枯水期,总体相差不大;TP浓度:丰水期>平水期>枯水期,丰水期浓度明显高于平水期、枯水期;TN、TP年均值分别为1.87、0.083 mg/L,较高的氮、磷含量易导致湖区浮游植物在适宜条件下大量繁殖,富营养化风险加剧。The phenomenon of excessive nitrogen and phosphorus nutrients in water bodies represented by urban lakes is common,leading to the deterioration of water body functions,environmental health risks,and affecting the function of water landscape.Based on water quality data from 2013 to 2018 of an urban lake,water quality interannual variation trend were analyzed.Spearman correlation principle was used to establish correlation between each and whole lake region,and to evaluate water quality with the method of Nemero index and pollution-sharing ratio method.Based on water quality data from August 2018 to July 2019,seasonal variation rule of nitrogen and phosphorus nutrients of an urban lake were analyzed.According to evaluation results,the change of water quality of western lake was most closely related to the change of water quality of whole lake area.Since 2015,water quality of the lake area showed a trend from poor to the aggravation of pollution,among which,TP and TN pollutants were the most serious in whole pollution composition system.Seasonal variation rule of nitrogen and phosphorus nutrients in urban lake showed that TN concentration was higher in normal water period than in high water period,and also higher than in low water period,but the overall difference was not so much.TP concentration was higher in wet season than in normal and dry season,and the concentration in high water period was higher than in normal and low water period.Annual average values of TN and TP were 1.87 mg/L and 0.083 mg/L,the higher nitrogen and phosphorus content was easy to make phytoplankton in the lake area multiply in suitable conditions.

关 键 词：内梅罗指数 污染分担率 总氮 总磷 季节性变化 

分 类 号：TU992.3[建筑科学—市政工程]