Modeling the wash-off of pollutants on urban different land use types

Urban surface pollutants is now recognized as a major source of urban non-point pollution source. In order to the effective control urban stormwater runoff, it is key wash-off process of pollutants to scientifically calculate surface pollutants loads. The artificial rainfall experiment was conducted to simulate road surface pollutant wash-off process under nature rainfall condition from representative land uses types in Zhenjiang. The results show that the wash-off intensity is the main factor affecting the wash-off process, CF is depends on rainfall intensity, along with the rainfall intensity change of the linear growth stage, the stable change stage of the washed fine particles and the rapid increase stage of the washed big particles. The parameter of wash-off capacity is introduced to modify the pollutant wash-off model. Through the compared with calculated and measured values of pollutants, the parameter calibration of wash-off equation is correct, the computed result is reasonable, which provides the scientific basis for non-point source pollution control and management in China.