点源影响下的SWAT模型非点源负荷核定方法

Method of Non-point Source Pollution Load Accounting by SWAT Model under Influence of Point-source Discharge

在多参数模型应用中,单纯以控制断面资料为标准进行校核易导致模型参数的不确定性,而估算点源和实际点源输入的误差将进一步加大此不确定性。为解决点源影响下流域污染负荷核定问题,提出采用断面水质校核与流域输出系数评价相结合的方法进行SWAT模型的率定和验证,并将其应用于鞍山市南沙河流域污染负荷的模拟中。结果表明,南沙河断面水质模拟结果符合污染物质输出规律,不同土地利用类型的输出系数计算结果合理,可见SWAT模型在以点源污染为主的流域同样具有较好的适用性。

The uncertainty of model parameters will be caused if only control section calibration is done in the applica- tion of multi-parameter model. Moreover, the difference between the estimated and the actual point-source discharge may strengthen this uncertainty. In order to solve this problem, SWAT model of calibration and validation was developed by integrating monitoring data comparison and output coefficient evaluation. The method was applied to Nansha river basin in Anshan City. The results show that the simulation results fit quite well with the monitoring data in the control section and the output coefficients of various land use are in reasonable ranges; SWAT model performs well on the modeling of pollu- tion nrocess and it is a nromisin~ model for continuous simulation in point-source dominant basin.