Simulation of water environmental pollution and identification of key source areas —A case study of Yiwu River Basin [流域水环境污染模拟及关键源区鉴别——以义乌江流域为例]

作者：Zhang J.; Zheng H.; He M.; Ma J.^*

来源：Chinese Journal of Environmental Engineering, 2021, 15(4): 1167-1177.

DOI：10.12030/j.cjee.202008005

• Critical source area
• Pollution load
• Spatiotemporal distribution
• SWAT
• Water environmental pollution
• Water shortage
• Yiwu River Basin

The runoff, sediment and water quality processes of the Yiwu River Basin were simulated based on SWAT model. The Load Per Unit Area Index mothod was used to calculate the intensity of nitrogen and phosphorus loss and divide the loss intensity into five gradesfor the identification of the key source areas. Results show that domestic pollution sources are the main sources of water environmental pollution in Yiwu River basin, and the input proportion of nitrogen and phosphorus is 52.7% and 61.9% respectively. Nitrogen and phosphorus pollution load mainly concentrated in the flood season (March to July), accounting for 66% and 63% of the whole year respectively. The high load areas of nitrogen and phosphorus pollution are mainly concentrated in Chengxi street, Fotang town, dongyangjiang Town and Shuangxi township. The key source area of Yiwu River Basin are 4 of the 18 sub-basins. Based on the quantitative simulation identification of water environmental pollution in the river basin, this study established the identification method of key pollution source area, which can provide reference methods for the prevention and control of water environmental pollution in the river basin with high pollution load.

• 单位
  城市和区域生态国家重点实验室; 中国科学院大学