关键词: 水质变化; 氨氮; 总磷; 单因子评价法; 水质综合污染指数法; 季节性肯达尔检验法; 赣江吉安河段;

Abstract: Based on the time series data from 2008 to 2018 of Ji'an section of Ganjiang River obtained from Ji'an Water Resources Monitoring Centre,single factor evaluation method,comprehensive pollution index method and seasonal Kendall test method were adopted to analyze surface water resources characteristics and water quality variation trend in the river section.The results showed that:(1)According to the annual average statistical data,the water quality in Ji'an section of Ganjiang River was good,superior to or meeting class Ⅲ water standards,and the water quality of each functional area reached the target requirement;the comprehensive pollution index had been controlled between 0.21 and 0.40 over the years,with no significant change in time and space,and the water quality was relatively stable.(2)According to the monthly average statistical data,the indicators of dissolved oxygen and permanganate tended to be improved,BOD(5 )remained unchanged,ammonia nitrogen and total phosphorus tended to deteriorate,and the water quality as a whole tended to deteriorate.In view of the above results,the causes of water pollution in Ji'an section of Ganjiang River were further analyzed by discussing the influencing factors of the natural and human pollutants.Based on the analysis results,it is suggested to strengthen the monitoring of Ji'an section of Ganjiang River to control non-point source and point source pollution.

Key words: water quality variation; ammonia nitrogen; total phosphorus; variation trend; single factor evaluation method; comprehensive water quality pollution index method; seasonal Kendall test; Ji'an section of Ganjiang River;