摘要
为探究流域径流与农业非点源污染特征,选取湖北省咸宁市淦河十好桥控制流域为研究区域,开展了6场次降雨径流过程监测(含3场同步水质测试),并对监测成果进行分析。结果表明,开始降雨后1~3 h内河道水位流量显著上升,洪峰滞后雨峰8~11.5 h,场次降雨最大造峰雨强与洪峰流量正相关,暴雨中心的空间分布直接影响降雨径流转化关系。非点源氮磷浓度与径流量正相关,其中氨氮与总氮浓度峰值早于径流峰值,总磷浓度峰值则滞后出现,大中型洪水过程中的污染物迁移量显著高于一般洪水。
To investigate the characteristics of watershed runoff and agricultural non-point source pollution,taking the Shihaoqiao Controlled Watershed of the Gan River in Xianning City,Hubei Province as the research area,this study monitored 6 rainfall runoff processes(including 3 simultaneous water quality tests)and analyzed the monitoring results.The results revealed that the river water level and discharge increased significantly within 1-3 h after the rainfall onset,with the flood peak lagging behind the rainfall peak by 8-11.5 h.The maximum peakgenerating rainfall intensity of a single rainfall event positively correlated with the flood peak discharge,and the spatial distribution of the rainstorm center directly affected the rainfall-runoff conversion relationship.The non-point source nitrogen and phosphorus fluxes positively correlated with the runoff,with the peak concentrations of ammonia nitrogen and total nitrogen preceding the runoff peak,while the peak concentration of total phosphorus lagged behind.The pollutant migration amount in large and medium-sized flood processes was significantly higher than that in general floods.
作者
熊昱
刘元九
赵涵美
XIONG Yu;LIU Yuanjiu;ZHAO Hanmei(Changjiang Water Resources Protection Institute,Wuhan 430051,China;Changjiang Water Resources and Hydropower Development Croup(Hubei)Co.,Ltd.,Wuhan 430015,China;Hubei Water Resources Technical College,Wuhan 430070,China)
出处
《长江技术经济》
2025年第5期16-23,共8页
Technology and Economy of Changjiang
关键词
场次降雨径流
非点源污染
氮磷通量
十好桥控制流域
rainfall runoff
non-point source pollution
nitrogen and phosphorus fluxes
Shihaoqiao Controlled Watershed
