Water quality assessment and spatial-temporal variation analysis in Erhai lake, southwest China

被引:9
作者
Chen, Xuekai [1 ,2 ]
Liu, Xiaobo [1 ,2 ]
Li, Bogen [3 ]
Peng, Wenqi [1 ,2 ]
Dong, Fei [1 ,2 ]
Huang, Aiping [1 ,2 ]
Wang, Weijie [1 ,2 ]
Cao, Feng [1 ,2 ]
机构
[1] China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat River Basin Water, Beijing 100038, Peoples R China
[2] China Inst Water Resources & Hydropower Res, Dept Water Ecol & Environm, Beijing 100038, Peoples R China
[3] Yunnan Hydrol & Water Resources Bur, Water Resources Dept Yunnan Prov, Kunming 650106, Yunnan, Peoples R China
基金
中国国家自然科学基金; 北京市自然科学基金; 国家重点研发计划;
关键词
water quality; Erhai lake; WQI; spatio-temporal distribution characteristics; DISSOLVED-OXYGEN; RIVER-BASIN; INDEX; ENVIRONMENT; PHOSPHORUS; INDICATORS; PARAMETERS; POLLUTION; IMPACT; WQI;
D O I
10.1515/geo-2020-0326
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
For the implementation of lake ecological protection, understanding the water pollution status and spatio-temporal variation of water quality has become the most important thing for water safety in the basin. To analyze the water quality in recent years, water quality data in Erhai lake from 2013 to 2017 were first collected from typical nine monitoring stations. Based on the comprehensive water quality index (WQI) method, the temporal and spatial variation characteristics of water quality in Erhai lake were analyzed, and the main factors affecting water quality in Erhai lake were explored. The results indicated that the water quality of Erhai lake was worse than its target water quality, and total nitrogen (TN) and total phosphorus (TP) exceeded the Class II standards (TN: 0.5 mg L-1, TP: 0.025 mg L-1) of China's Environmental Quality Standard for Surface Water (GB3838-2002). In terms of changes across seasons, the overall lake water quality in the dry season was better than that in the wet season, and TN and TP reached the peak value in September. In terms of spatial distribution, water quality of the northern area was better than that of the southern area in the dry season, whereas water quality of the southern area was better than that of the northern area in the wet season. At present, Erhai lake is at a critical turning point of water eutrophication, and its nutrition status is mainly affected by both nitrogen and phosphorus. The pollution load from the land area is the main factor affecting the deterioration of Erhai lake. Our results can provide a scientific basis for the treatment of the water environment of Erhai lake.
引用
收藏
页码:1643 / 1655
页数:13
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