Abstract

WANG, Jucui et al. Simulation for non-point source pollution based on QUAL2E in the Jinghe River, Shaanxi Province, China. Tecnol. cienc. agua [online]. 2017, vol.8, n.2, pp.117-126. ISSN 2007-2422.  https://doi.org/10.24850/j-tyca-2017-02-11.

Water pollution in river basins is significantly influenced by point-source and non-point-source pollutants. Compared with point-source pollutants, the identification and quantification of non-point-source pollutants are critical but difficult issues in water environmental pollution studies. The Jinghe River is one of the main tributaries of the Weihe River. However, the non-point-source pollution of this river is not well understood. In order to analyze the sources of point- and non-point loads to river water, the river water quality model QUAL2E and Principal Component Analysis (PCA) & Factor Analysis (FA) were applied simultaneously to calculate the point- and non-point-source loads of ammonia nitrogen and nitrate nitrogen, respectively, in dry and wet seasons from 2002 to 2007. The results show that NO3--N can be associated with point-source pollution, such as domestic sewage in dry seasons, but non-point-source pollution generated by precipitation in wet seasons. NH4+-N can be associated with point-source pollution throughout the year. The methods applied in this research provide reliable results on non-point-source pollution caused by storm runoff.

Keywords : QUAL2E; degradation coefficient; source/sink term; non-point-source pollution.

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