Identification and Control of Key Sources of Total Phosphorus in Haicheng River Basin Based on SWAT Model
Based on the analysis function of the SWAT model,the total phosphorus load and its spatiotemporal distribution as well as pollution sources in the Haicheng River Basin are analyzed,and treatment plans are set according to the characteristics of pollution sources.The scenario simulation function of the SWAT model is used to compare the pollution reduction rates of different plans,and finally the best management plan is obtained.The simulation calculation results show that in terms of time distribution,there is a positive correlation between pollution load changes and runoff changes,mainly influenced by runoff and farmland fertilization.The total phosphorus load during the flood season accounts for approximately 67.62%of the total load.In terms of spatial distribution,the average pollution load in the upstream is relatively low,and the input of total phosphorus pollution mainly comes from the downstream,accounting for 35.02%of the output.The key sources are aquaculture sources and domestic sources,respectively.The main sources of total phosphorus pollution in the Haicheng River Basin are agriculture,animal husbandry,and domestic sources,with contribution rates of 30.48%,25.14%,and 41.59%,respectively.The key source is domestic sources.Measures such as scientific fertilization,scientific utilization of livestock manure,and restoration of the river and surrounding ecological environment can be taken to effectively reduce and intercept the total phosphorus pollution entering the river for each pollution source.
万方数据
维普
