Water Quality and Spatial-temporal Variation Characteristics from Main Stream and Main Tributaries of North River

Zhou Minghao; Li Tong; Lin Xueming; Ye Sihua; Zhang Xuerong; Deng Ying

doi:10.13961/j.cnki.stbctb.2023.05.014

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Water Quality and Spatial-temporal Variation Characteristics from Main Stream and Main Tributaries of North River

- Water Quality and Spatial-temporal Variation Characteristics from Main Stream and Main Tributaries of North River
- Bulletin of Soiland Water Conservation Vol. 43, Issue 5, Pages: 111-120(2023)
- 作者机构：
  
  1. 广东省生态环境监测中心,广东,广州,510308
  2. 华南农业大学资源环境学院,广东,广州,510642
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.05.014
  CLC： X522
- Published：2023
- 稿件说明：
移动端阅览
Zhou Minghao, Li Tong, Lin Xueming, et al. Water Quality and Spatial-temporal Variation Characteristics from Main Stream and Main Tributaries of North River[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 111-120.
DOI：

Zhou Minghao, Li Tong, Lin Xueming, et al. Water Quality and Spatial-temporal Variation Characteristics from Main Stream and Main Tributaries of North River[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 111-120. DOI： 10.13961/j.cnki.stbctb.2023.05.014.

摘要

[目的] 分析2020年北江干流及主要支流监测断面的水质情况，为北江水环境监控及保护提供参考依据。[方法] 采用单因子评价法和主成分分析法，研究北江水质时空变化趋势及驱动因素。[结果] 2020年北江监测断面整体水质良好，仅水车头、漫水河河口、黄浪水桥、龙归断面水质为Ⅲ—Ⅳ类，其他断面均为Ⅱ类。北江水温和溶解氧受季节影响较大，水体全年基本保持弱碱性，下游营养盐和有机物污染程度高于上、中游。[结论] 由空间分析结果可知，下游水质劣于上、中游，其主要的影响因素是营养盐和溶解氧，pH值单独作用不会对水质产生明显影响。季节污染程度排序为:夏季＞秋季＞春季＞冬季，其中全河段的水质主导因素为溶解氧，而下游河段的主导因素为营养盐和有机物。

Abstract

[Objective] The water quality of the main stream and main tributary monitoring sections of the North River in 2020 was analyzed in order to provide a reference and basis for monitoring and protecting the water environment of the North River. [Methods] The single factor evaluation method and principal component analysis were used to determine the spatial and temporal trends and driving factors of water quality for the North River. [Results] In 2020

the overall water quality of the North River monitoring sections was good. Only the sections of Shuichetou

Manshui River estuary

Huanglongshui Bridge

and Longgui met the standards for water quality grades Ⅲ—Ⅳ

and the other sections were determined to be grade Ⅱ. Water temperature and dissolved oxygen in the North River were influenced by the seasons. The water body basically remained weakly alkaline throughout the year

and the pollution levels of nutrients and organic matter were higher downstream than at upstream and midstream locations. [Conclusion] Spatial analysis showed that downstream water quality was worse than upstream and midstream water quality. The main influencing factors were nutrients and dissolved oxygen. pH value alone did not have a significant impact on water quality. The seasonal pollution degree followed the order of summer ＞ autumn ＞ spring ＞ winter. The dominant factor on water quality for the entire river was dissolved oxygen

while the dominant factors for the downstream river section were nutrients and organic matter.

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