Quantity Study On Non-point Source Pollution Of City

This paper studied the non-point source pollution load of city. Summarized quantity studies of non-point source pollution all over the world, the models which is applied widely was analysed and compared. Then the simulation methods of Storm Water management model (SWMM) were lucubrated. After the study area was explorated and the characters of pollutant buildup and washoff was researched, study area was generalized according to landform and subcatchment. Constructed the non-point source pollution load model about Nanyuan catchment of Suzou City, quantity of study area was calculated with the model.SWMM was applied to calculate the non-point source pollution load and the main study content is as following.(1) SWMM was analysed how apply to study non-point source pollution of city. Research the runoff system, pollution buildup and washoff system and transport system, feasibility of the model apply to analysis non-point source pollution of city.(2) Constructed non-point source pollution load model on Nanyuan subcatchment of Suzhou city. On the base of data from GIS and survey of study area on the spot, non-point source pollution load model of study area was constructed.(3) Using the constructed model, non-point source pollution was calculated once rain under three sorts of different conditions, which were different rain intensity, different rain types, different land use type. Then non-point source pollution load was calculated under the low water typical year (1979a) in Suzou city, and meanwhile non-point source pollution load was simulated under different non-point source pollution management and control, analysis the non-point source pollution gross, and compare to efficiency of different measurement to control non-point source pollution.