河北平原区农田地表径流输入河道中的氨氮量确定

鉴于农田地表径流的面源污染是在河道两岸以线性的形式汇入受纳河体,在符合应用零维河道水质模型的水体中,建立一个估算河道出口断面农田地表径流的面源污染的输出模型,选取河北平原区府河中游的1 000m河道进行试验分析来验证模型。结果表明,模型估算值与实际测量值较为接近,估算产流后的3 333s内农田地表径流中氨氮污染物向试验区出口输出量为13.6g。

Output Calculation and Analysis of Ammonia Nitrogen of Farmland Surface Runoff in Hebei Plain

Non-point source pollution of farmland surface runoff mingles the river on both sides of river course with linear form. In accord with zero-dimensional river water quality model, a output model for estimation of non-point source pollution of farmland surface runoff in channel outlet section was established. The 1 000 m channel in the middle reaches of the Fuhe River was selected to test and verify the model. It shows that the results obtained by the model is close to the actual measurement value; within 3 333 s after estimating runoff yield, the pollutants output of ammonia nitrogen in the farmland surface runoff is 13.6 g.