Journal
WATER
Volume 13, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/w13101385
Keywords
non-point source pollutant loads; Soil and Water Assessment Tool; event mean concentration; Storm Water Management Model; urban catchment
Categories
Funding
- National Natural Science Foundation of China [32071580, 41871192, 41671184]
- National Key Research and Development Program of China [2016YFC0500401]
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This study proposes an integrated approach for estimating agricultural and urban non-point source pollution in urban agglomeration watersheds by coupling different models. The results revealed significant discrepancies in total nitrogen and total phosphorus values between the EMC method and the SWAT model in the built-up area, indicating a severe underestimation of nutrient yield by SWAT. The integrated method could provide guidance for water environment management plans considering both agricultural and urban NPS pollution in urban catchments.
Urban agglomeration is a new characteristic of the Chinese urbanization process, and most of the urban agglomeration is located in the same watershed. Thus, urban non-point source (NPS) pollution, especially the characteristic pollutants in urban areas, aggravates NPS pollution at the watershed scale. Many agricultural studies have been performed at the watershed scale; however, few studies have provided a study framework for estimating the urban NPS pollution in an urban catchment. In this study, an integrated approach for estimating agricultural and urban NPS pollution in an urban agglomeration watershed was proposed by coupling the Soil and Water Assessment Tool (SWAT), the event mean concentration (EMC) method and the Storm Water Management Model (SWMM). The Hun-Taizi River watershed, which contains a typical urban agglomeration and is located in northeastern China, was chosen as the study case. The results indicated that the per unit areas of total nitrogen (TN) and total phosphorus (TP) in the built-up area simulated by the EMC method were 11.9% and 23 times higher than the values simulated by the SWAT. The SWAT greatly underestimated the nutrient yield in the built-up area. This integrated method could provide guidance for water environment management plans considering agricultural and urban NPS pollution in an urban catchment.
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