闸控入海河流DO时空分布特征及其驱动因素

金晓玥; 黄菊; 范中亚; 黄露; 罗千里; 王振

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (6) : 3311-3320.

环境生态

闸控入海河流DO时空分布特征及其驱动因素

金晓玥^1,2, 黄菊², 范中亚², 黄露², 罗千里², 王振¹

作者信息 +

Spatiotemporal distributions of dissolved oxygen and its driving factors in gate-controlled seagoing rivers

JIN Xiao-yue^1,2, HUANG Ju², FAN Zhong-ya², HUANG Lu², LUO Qian-li², WANG Zhen¹

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文章历史 +

摘要

本文以广东省黄江河为研究对象,基于沿程3个水质自动监测站数据,分析枯水年(2021年)、丰水年(2023年)黄江河挡潮闸闸上与闸下河段DO的时空分布特征,并采用统计学方法,研究了DO变化的驱动因素及相对贡献.结果表明:闸上河段因水环境相对稳定,西闸断面DO呈现枯水年((8.02±0.10) mg/L)>丰水年((7.26±0.08) mg/L)特征;而闸下河段因水质改善,DO呈现枯水年((4.45±0.10) mg/L)<丰水年((7.33±0.09) mg/L)特征;枯、丰水年年内全河段DO均呈现汛期高、非汛期低的周期性变化规律.受闸坝作用及外源输入差异影响,闸上河段DO变化的主要驱动因素为降雨和水温,贡献度达到44%~87%;闸下河段DO变化的主要驱动因素则是氨氮和高锰酸盐指数,贡献度达到53%~75%.闸上“湖泊化”缓流河段DO更易受气候变化影响,尤其是暴雨径流引起的浮游植物流失是导致枯、丰水年DO差异的直接原因.而枯水年闸下感潮河段DO受外源污染输入及滞留影响显著,丰水年闸下河段耗氧物质的减少是DO提升的重要原因.

Abstract

This study analysed the spatiotemporal characteristics of dissolved oxygen (DO) concentrations upstream and downstream of sluices during dry and wet years, using data from three automated water quality monitoring stations and field measurements along the Huangjiang River in Guangdong Province. Multiple statistical methods were employed to identify the relative contributions of key influencing factors to DO variability across years under different precipitation conditions. Upstream DO concentrations were generally higher in dry years ((8.02±0.10) mg/L) than in wet years ((7.26±0.08) mg/L). In contrast, DO levels in the downstream tidal section increased from (4.45±0.10) mg/L (dry year) to (7.33±0.09) mg/L (wet year), primarily due to improved water quality. Periodic fluctuations were observed in both years, with higher DO levels during the flood season and lower levels during the non-flood season throughout the river channel. Influenced by the gate control and different external inputs, DO fluctuations upstream and downstream were driven by different factors. Rainfall and water temperature explained 44% to 87% of the DO variability upstream. While ammonia nitrogen, and COD_Mn were the most influential factors downstream, accounting for 53% to 75% of the variability. Furthermore, the “lacustrine” upstream section was especially sensitive to climate variations. In this area, the loss of phytoplankton biomass caused by stormwater runoff was a major factor contributing to DO difference during dry and wet years. While DO downstream is more easily influenced by water pollutants, especially the significant decrease in oxygen-demanding substances.

导出引用

金晓玥, 黄菊, 范中亚, 黄露, 罗千里, 王振. 闸控入海河流DO时空分布特征及其驱动因素[J]. 中国环境科学. 2025, 45(6): 3311-3320

JIN Xiao-yue, HUANG Ju, FAN Zhong-ya, HUANG Lu, LUO Qian-li, WANG Zhen. Spatiotemporal distributions of dissolved oxygen and its driving factors in gate-controlled seagoing rivers[J]. China Environmental Science. 2025, 45(6): 3311-3320

中图分类号： X522

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