小流域径流面源污染负荷产生过程研究

Simulation on the Time Progress of the Non-point Source Pollution Load in Runoff for Small Watershed

以南方某水库为例,采用水文学降雨产汇流单位线法分析流域典型设计雨型产生的地表径流入库流量时间变化过程,基于西丽水库主要河流控制断面水量、水质同步观测时间序列资料,建立控制断面集水区域面源COD,NH_3-N等污染物入库通量与入库径流量的数学响应关系,并据此模拟设计降雨产生的地表径流面源污染负荷入库时间动态变化过程,可在为面源初期雨污水治理工程设计提供技术参数。

Taking a reservoir in South China as an example,we use rainfall runoff unit hydrograph method to analyze the time changing process of surface runoff inflow, which generated by typical design rainfall.On the basis of time series data of flow and water quality in control section of the main rivers of Xili Reservoir,we establish mathematical response relation between storage flux of non-point source pollutants,such as COD,NH3-N in catchment area of control section and inflow runoff.Then we simulate non-point source pollution load storage time dynamic change progress, which generate with the initial surface runoff generated by designing rain fall.It can provide technical parameters for the design of non-point source of early rain sewage treatment project.