In this study,a total nitrogen source tracing method integrating UAV flight detection,manual densified monitoring,pollution source inspection along the river and other technical means was adopted in the upstream basin of the estuary of an important seaward river in Qinhuangdao City of Hebei province.The pollution source detection and on-site monitoring were conducted based on water nitrogen-related water quality indexes,and the sources of total nitrogen in the rivers were classified and analyzed.The results showed that nitrate nitrogen was the key factor leading to the increase of to-tal nitrogen concentration in rivers in this region.The main sources of total nitrogen pollution were industrial sources such as factory tail-water discharge and direct discharge of wastewater,domestic sewage and garbage of urban and rural resi-dents,and agricultural sources such as agriculture and forestry cultivation.Based on the practical experience of total nitro-gen traceability analysis,the technology and management suggestions for controlling and reducing total nitrogen pollution from different sources are put forward.
维普
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