Water quality spatial and temporal variation characteristics in major rivers in Chongqing Municipality,2011～2021
Chongqing Municipality is located in the Three Gorges Reservoir area,an important ecological barrier area in the up-per reaches of the Changjiang River.It is important to reveal the surface water quality variation characteristics in Chongqing for as-sessing the ecological and environmental changes in the Changjiang River.However,the analysis of surface water quality charac-teristics on a large scale and long time scale is still lacking.Based on the historical data from 2011 to 2021,the 11-year water quality data of 44 river monitoring sections in the main 18 river basins of Chongqing were analyzed by single factor analysis and water quality category ratio method.The results showed that:①The overall water quality of rivers in Chongqing was good,with the proportion of Class Ⅰ～Ⅲ water quality sections gradually increasing and stabilizing since 2012.The evaluation of water quality conditions was excellent.②The temporal variation trend of the water quality between the flood and non-flood seasons was rough-ly the same.However,the proportion of Class Ⅳ to inferior Class Ⅴ water quality sections in the non-flood season was lower than that in the flood season,and the overall water quality was better during the non-flood season.③ The water quality in the lower reaches of the Chongqing section of the Changjiang River Basin was significantly better than that in the upper reaches.Over-all,since the Three Gorges Reservoir reached the storage level of 175.00 m in 2010,the water quality in the Chongqing section of the Changjiang River Basin has maintained a better state,with water quality categories mostly maintained in Class Ⅱ,achieving the national target.④ There were some differences in water quality between different basins.The best situation was in the Jialing River Basin,followed by the Fujiang River Basin,the Chongqing section of the Changjiang River Basin,and the Wujiang River Ba-sin.⑤ The water quality of the Chongqing section of the Changjiang River Basin,Jialing River Basin,and Fujiang River Basin was worse in the flood season compared with the non-flooded season.Water quality conditions in the Wujiang River Basin varied sim-ilarly between the two time periods.By evaluating the water quality of surface rivers in Chongqing over a long period,this study can provide a reference for the protection of river water resources,sustainable management,water quality improvement in the city,and promotion of city sustainable development.
river water qualitytemporal and spatial variationsingle factor analysis methodwater quality category scale methodinfluencing factorsChongqing Municipality
国家科技期刊平台
NSTL
万方数据
