【摘要】 石河是河北省秦皇岛市的重要河流，为区域水源供给、农业灌溉及生态保护提供关键支持。本研究基于石河沿线5个监测断面2021—2023年的水质数据，采用综合污染指数法(CPI)和水质指数(WQI)方法，系统分析了水质现状及时空变化特征。结果显示，CPI值介于0.27～0.50之间，反映水质总体良好，下游铁路桥断面存在轻度污染；WQI值介于80～89之间，表明水质达“良”等级但稳定性不足。pH和溶解氧(DO)表现优异，符合I类标准，而COD和营养盐指标部分超标，显示城市化和农业面源污染的潜在威胁。研究提出加强COD控制和生态修复的保护措施，成果可为石河流域水污染防治及水资源管理提供科学依据。更多还原

【Abstract】 The Shihe River is an important river in Qinhuangdao City, Hebei Province, providing crucial support for regional water supply, agricultural irrigation and ecological protection. Based on the water quality data of five monitoring sections along the Shihe River from 2021 to 2023,this study systematically analyzed the current water quality status and spatio-temporal variation characteristics by using the Comprehensive Pollution Index(CPI) method and the Water Quality Index(WQI) method. The results show that the CPI value ranges from 0.27 to 0.50,indicating that the water quality is generally good, but there is mild pollution at the downstream railway bridge section; the WQI value ranging from 80 to 89 indicates that the water quality is of good grade but lacks stability; and the pH and dissolved oxygen(DO) performance was excellent, meeting the Class I standard, while the COD and nutrient salt indicators partially exceeded the standard, indicating the potential threat of urbanization and agricultural non-point source pollution. The research results on strengthening COD control and ecological restoration protection measures can provide a scientific basis for water pollution prevention and control as well as water resource management in the Shihe River Basin.更多还原