2015-2019年武汉市湖泊水质时空变化

为探究"十三五"期间武汉市湖泊水质变化特征及规律,分析当前武汉市湖泊水环境的主要问题及成因,为武汉市水生态环境保护"十四五"规划提供科学支撑,以武汉市166个湖泊为研究对象,根据武汉市环境监测中心2015-2019年对各个湖泊的监测数据,采用水质综合污染指数、富营养化状态评价、动态度分析等方法,对武汉市湖泊水环境进行综...

Spatiotemporal variations of water quality of lakes in Wuhan from 2015 to 2019*

To explore the variation trend of water quality of lakes in Wuhan during the 13th Five-Year Plan period, analyze the main problems and causes of the water environment of lakes in Wuhan, and provide scientific support for the 14th Five-Year Plan of water environment protection in Wuhan, 166 lakes were selected as the research objects. Based on the monitoring data of each lake from 2015 to 2019 derived from the Wuhan Environmental Monitoring Center, the comprehensive pollution index, eutrophication analysis, dynamic degree analysis and other methods were used to evaluate the water environment of lakes in Wuhan. The results showed that: 1) The water quality of lakes in Wuhan was generally improved. The comprehensive pollution index of lakes decreased by 7.74% compared with that in 2015, and the eutrophication status of most lakes showed a trend of improvement. However, it was difficult to achieve continuous improvement of the water quality of those lakes. 2) The average concentrations of total phosphorus (TP), ammonia nitrogen, COD_Cr and COD_Mn showed a downward trend from 2015 to 2019, but the average concentrations of TP of 47% of the lakes were inferior to the class IV evaluation standard. The phosphorus was the main factor restricting the water quality of the lakes. 3) From 2015 to 2019, the comprehensive pollution index of lakes in the central districts of Wuhan decreased, and the eutrophication status was improved. Nevertheless, the comprehensive pollution index of Qingshanbei Lake and South Lake was relatively high, and the main factors affecting the water quality of lakes in the central districts were the discharge from the outlet and internal pollution of sediment. The improvement of water quality of lakes in the suburban area was still under stress, which resulted from agricultural non-point source pollution and industrial production. More lakes entered a serious eutrophication status in the Dongxihu Lake system, and the comprehensive pollution index of lakes in the Houhu Lake system increased. The decrease of self-purification ability caused by lake fragmentation was also an important factor affecting water quality.