人民长江2024，Vol.55Issue(6)：30-36,7.DOI:10.16232/j.cnki.1001-4179.2024.06.005
淠河水质时空变化特征及驱动因素分析
Spatial and temporal variation characteristics of water quality and its influencing factors in Pihe River
摘要
Abstract
To comprehensively reveal water quality pollution and the spatiotemporal variation characteristics of the Pihe River Basin in recent years,the water quality index(WQI)method was adopted to evaluate the river water quality based on monitoring data of pH,dissolved oxygen(DO),chemical oxygen demand(COD),5-day biochemical oxygen demand(BOD5),ammonia nitrogen(NH3-N),total nitrogen(TN),and total phosphorus(TP)from the mainstream of the Pihe River from2018 to2022.Additionally,correlation analysis was considered to identify key water quality indicators influencing water quality.The results were as follows:① The mainstream of the Pihe River has generally favorable water quality,with WQI averaging at(75.94±7.47),ranking in the"good"range.However,during non-flood seasons,the concentration of NH3-N ranged from 0.020～1.480 mg/L,signifying a relatively high load.②The spatial distribution of water quality ranked as follows:Hengpaitou>Dadiangang>Yaogangzui>Xin'an Ferry.③At the time level,the water quality of mainstream during the flood season(June to September)was markedly superior to that during the non-flood season(January to May and October to December).④ The correlation analysis showed that the water was mainly polluted by NH3-N,TN,and COD in the study area.In the Hengpaitou-Yaogangzui section and Xin'an Ferry-Dadiangang section with arable land as a major land use type,the water was mainly affected by COD,TN,and NH3-N generated from fertilizer application and livestock farming.In the Yaogangzui-Xin'an Ferry section,the water quality was severely impacted by the direct discharge of urban domestic sewage and effluent from sewage treatment plants,causing serious NH3-N pollution.During the flood season,water pollution gradually alleviates as concentrated rainfalls happen.From the per-spective of protecting the ecological environment of the Pihe River,this study proposed to boost the self-purification capacity of the watershed,strengthen the prevention of agricultural non-point source pollution,and improve the intercepting and treating sew-age systems.关键词
水质/WQI法/变化趋势/影响因素/淠河Key words
water quality/WQI/variation trend/influencing factors/Pihe River分类
资源环境引用本文复制引用
朱沉静,谭茜,郭志阳,汪可欣,吴师..淠河水质时空变化特征及驱动因素分析[J].人民长江,2024,55(6):30-36,7.基金项目
引江济淮工程(安徽段)输水沿线水源保护区划分、重大突发性水污染事件预警系统和水源地保护规划等课题研究项目(YJJH-ZT-ZX-20230706545) （安徽段）
国家水体污染控制与治理科技重大专项(2017X07603-005) （2017X07603-005）
