东江河口典型河段溶解氧时空动态及低氧成因解析  

Temporal and spatial dynamics of dissolved oxygen and formation of hypoxia in typical reaches of Dongjiang River estuary

作　　者：黄广灵 黄本胜[2] 刘达[2] 邱静[2] 黄国如[1,4] Huang Guangling;Huang Bensheng;Liu Da;Qiu Jing;Huang Guoru(School of Cinil Engineering and Transportation,South China Unirersity of Technology,Guangzhou 510640,P.R.China;Cuangdong Research Instiule of Water Resources and Hydropower,Guangzhou 510635,P.R.China;Guangdong Provincial Key Laboratory of River Basin Water Environment Management and Aquatic Ecosystem Restoration,Guangzhou 510635,P.R.China;State Key Laboratory of Subtropical Building and Urban Science,Guangzhou 510640,P.R.China)

机构地区：[1]华南理工大学土木与交通学院,广州510640 [2]广东省水利水电科学研究院,广州510635 [3]广东省流域水环境治理与水生态修复重点实验室,广州510635 [4]华南理工大学,亚热带建筑与城市科学全国重点实验室,广州510640

出　　处：《湖泊科学》2025年第1期112-121,共10页Journal of Lake Sciences

基　　金：2023年广东省科技创新战略专项资金科研项目(gdsky2023-03);广东省自然科学基金项目(2021A1515012077)联合资助。

摘　　要：为解析东江南支流低氧现象的成因,并为水环境治理提供科学依据,本研究分别于2019年春季和夏季对该河流的主要断面进行了水质监测。监测结果显示,东江南支流的溶解氧(DO)水平从中游道滘镇的6.93 mg/L降至出海口处的4.08 mg/L。DO与影响因子的相关性分析显示,DO与水温呈显著负相关,与盐度呈正相关,而与氨氮和总磷等营养物质呈显著负相关。这些营养物质的增加与DO的降低在空间上呈显著重叠,特别是在夏季。研究结果表明,东江南支流低氧现象受物理、化学和生物因素的共同影响,其中温度升高和营养物质浓度增加使得中下游水体的氧气消耗加快,河道汇流处的断面缩窄和下游水体的透光性差引起DO补给不足,从而导致下游沙田泗盛断面经常性出现氧亏(低氧)现象。To clarify the causes of hypoxia in the southern tributary of the Dongjiang River and provide scientific basis for water management,this study measured water quality of the main river sections during spring and summer in 2019.The measurement results showed that the dissolved oxygen in the southern tributary of the Dongjiang River dropped from 6.93 mg/L in the middle reaches at Daojiao Town to 4.08 mg/L at the estuary.Correlation analysis indicated that dissolved oxygen was significantly negatively correlated with water temperature,and positively correlated with salinity,and had a significant negative correlation with nutrients such as ammonium nitrogen and total phosphorus.The increase of nutrients was spatially significantly overlapped with the reduction of dissolved oxygen,especially during the summer.The main cause of hypoxia in the southern tributary of the Dongjiang River was the mixed influence of physical,chemical,and biological factors.The increase in water temperature and nutrients accelerated oxygen consumption in the middle and lower reaches of the water body.The narrowing of the river channel at confluences and poor light penetration in downstream waters led to insufficient replenishment of dissolved oxygen,and thus caused frequent hypoxia at the lower reaches Shatian Sisheng section.

关 键 词：东江南支流 溶解氧 低氧 营养物 珠江 

分 类 号：X52[环境科学与工程—环境工程]