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采用Johnes输出系数法以及SCS径流曲线和通用土壤流失方程估算法,对密云土门西沟小流域非点源污染负荷进行估算。结果表明,土门西沟小流域内附着态污染负荷的输出量是溶解态污染物输出量的3倍多,而附着态污染物输出量的大小主要由土壤侵蚀量决定,因此,控制流域内非点源污染的关键是加强该区的水土保持防治工作。Johnes输出系数法可用于观测资料比较缺乏的流域,而SCS径流曲线和通用土壤流失方程估算法除了可以估算总氮、总磷的含量外,还能分别估算出溶解态氮、磷和附着态氮、磷的量,使得防治非点源污染的措施可以更加有针对性。
The Johns’ output coefficient method and the SCS runoff curve and general soil loss equation estimation method were used to estimate the non-point source pollution load in the small watershed of Ximen County. The results show that the output of the attachment pollution load in the Ximen watershed is more than three times that of the dissolved pollutants, and the output of the pollutants is mainly determined by the amount of soil erosion. Therefore, The key to non-point source pollution is to strengthen the prevention and control of soil and water conservation in this area. The Johns’ output coefficient method can be used for watersheds where the observation data are scarce, and the SCS runoff curves and general soil loss equation estimation methods can not only estimate the contents of total nitrogen and total phosphorus, but also estimate the dissolved nitrogen, phosphorus and attached nitrogen , The amount of phosphorus, making prevention and control of non-point source pollution measures can be more targeted.