东江北干流作为广州市至关重要的东部饮用水源保护区所在地,水质目标为Ⅱ类。大墩断面是国家在东江北干流所设的最后一个考核断面,其水质状况对于评价东江北干流整体水质具有重要意义,但近5 a出现溶解氧(DO)不达标问题。搜集2018—2022年东江北干流及国家地表水考核大墩断面的水质数据,分析DO时空变化规律,采用皮尔逊相关分析、多元线性回归分析方法并结合近期水文气象、水质遥感影像等信息对东江北干流DO分布特征及国考大墩断面低氧成因进行研究。结果表明,东江北干流下游DO浓度明显低于中上游,枯水期含量高于丰水期。大墩断面DO浓度受多个因素的综合作用,与pH值、电导率、涨落潮流速呈正相关关系,与水温、TP、浊度及降雨量等指标呈负相关关系,上游来水水质也是影响东江北干流水体DO的关键因素。其中水温是主要影响因子,可解释溶解氧整体变化的62.1%。研究结论可为国家地表水考核大墩断面稳定达标提供基础支撑,有助于加强该区域水污染防控能力,提升水污染治理工作成效。
Abstract
The North mainstream of Dongjiang River is located at Guangzhou’s eastern drinking water source protection zone, with a target water quality of Class II. The Dadun section, as the last assessed section designated by the government in the North mainstream, holds significant importance in evaluating the overall water quality. However, the dissolved oxygen (DO) level in this section have failed to meet required standards over the past five years. We collected water quality data from the mainstream of Dongjiang River and the Dadun section during 2018-2022 and analyzed the temporal and spatial variations of DO concentration. Using Pearson correlation analysis and multiple linear regression analysis, we investigated the causes of low oxygen levels in the Dadun section based on recent hydrometeorological data and water quality remote sensing images. Our results revealed that the DO concentration in the lower reach of the north mainstream was significantly lower than that in the upper and middle reaches. Additionally, the DO concentration was higher during dry seasons compared to wet seasons. The DO concentration in Dadun section were influenced by numerous factors. It positively correlates with pH value, conductivity, and tidal current velocity, while negatively correlating with water temperature, total phosphorus (TP), turbidity, and rainfall. Furthermore, the upstream incoming water quality plays a crucial role in affecting the DO concentration of the north mainstream. Among these factors, water temperature emerges as the primary influencing factor, contributing 62.1% to the overall DO concentration variation. The research findings provide essential support for ensuring the stability of the Dadun section during national assessments, and moreover, contribute to strengthening the region’s capacity for water pollution prevention and control, ultimately enhancing the effectiveness of water pollution management efforts.
关键词
溶解氧 /
时空分布 /
影响因素 /
相关性分析 /
东江北干流
Key words
dissolved oxygen /
spatial-temporal distribution /
influencing factors /
correlation analysis /
the north mainstream of Dongjiang River
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基金
国家重点研发计划项目(2022YFC3202200)
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