山东农业大学学报（自然科学版）2026，Vol.57Issue(2)：332-344,13.DOI:10.3969/j.issn.1000-2324.2026.02.014
大汶河典型干流段不同水平年溶解氧与氨氮时空分布特征研究
Study on Spatiotemporal Distribution Characteristics of Dissolved Oxygen and Ammonia Nitrogen in Typical Mainstream Sections of the Dawen River in Different Level Years
摘要
Abstract
To understand the spatiotemporal distribution characteristics of DO and NH3-N in the typical mainstream section of the Dawen River under different level years,this study constructs a hydrodynamic water quality model for the typical river section based on the EFDC model.It quantitatively reveals the spatiotemporal distribution patterns of DO and NH3-N concentrations,and identifies the key pollution periods and river sections.The results show that in a normal year,DO concentration drops to its annual minimum of 5 mg/L in August,while NH3-N reaches its peak of 0.3 mg/L.In a dry year,NH3-N concentration reaches a peak of 0.843 mg/L in March,and decreases significantly with precipitation increased to 42.2 mm in April,while DO concentration remains stable within 7.0-8.6 mg/L.In a wet year,runoff lags behind precipitation by about one month;after precipitation peaks at 228 mm in August,DO drops to its lowest value of 6.3 mg/L in September,while NH3-N increases to its highest value of 0.318 mg/L,showing a negative correlation between the two.Spatially,during the non-flood season,in normal and dry years,DO concentration generally increases from Dawenkou to the estuary,with an increase of about 1.2-1.8 mg/L,while in wet increases from Dawenkou to the estuary,with an increase of about 1.2-1.8 mg/L,while in increases increases from Dawenkou to the estuary,with an increase of about 1.2-1.8 mg/L,while in wet years,DO is concentrated in the Daicun Dam area,with the midstream section being 0.5-0.9 mg/L higher than upstream and downstream sections.During the flood season,in normal years,DO shows a pattern of"Dawenkou>estuary>midstream",while in dry years,concentrations in the Daicun Dam area are 0.4-0.7 mg/L higher than in upstream and downstream sections.NH3-N concentration generally exhibits a decreasing spatial pattern,with reductions of 48%-67%from Dawenkou to the estuary,except during the flood season in wet years when it is enriched in the midstream,exceeding upstream and downstream sections by 0.3-0.5 mg/L.Under the combined influence of natural factors and human activities,water quality in the river reach shows spatial and temporal heterogeneity.The study provides a modeling foundation and scientific basis for formulating effective water pollution control measures and water resource management strategies.关键词
EFDC模型/大汶河水环境/DO/NH3-N/时空分布Key words
EFDC model/Dawen River water environment/dissolved oxygen/ammonia nitrogen/spatial and temporal distribution分类
建筑与水利引用本文复制引用
乔新贺,孙宇潇,张洁,李增斌,段震,王刚..大汶河典型干流段不同水平年溶解氧与氨氮时空分布特征研究[J].山东农业大学学报（自然科学版）,2026,57(2):332-344,13.基金项目
山东省自然科学基金资助项目(ZR2021MD119) （ZR2021MD119）
国家自然科学基金资助项目(41202174) （41202174）
