基于输出系数法核定双台子河非点源污染负荷

Based on Export Coefficient Theory in Simulating Pollution Load of Non-Point Source of ShuangTaiZi River

目的为准确地核定双台子河非点源污染输出负荷,确定各土地利用类型的COD和氨氮输出量.方法基于输出系数模型,结合1999-2008年降水量和2009年土地利用类型遥感数据,建立流域土地利用类型与非点源污染输出系数关系,利用线性优化方法,确定各输出系数.采用地理信息系统GIS空间分析技术提取不同土地利用类型面积数据,分析输出系数和土地利用面积定理关系.结果各土地利用类型中农业用地的输出系数较大,农业污染在非点源污染中贡献率约80%.非点源污染COD输出量为5 097.22 t/a,氨氮输出量为427.06 t/a,其中非点源COD贡献率约为33%,氨氮贡献率约为29.4%.结论非点源污染是流域污染控制工作的重点,为今后双台子河典型示范控制单元水污染控制提供技术支持.

In order to simulate accurately export loads of non-point source from ShuangTaiZi fiver and ensure COD and ammonia nitrogen export loads. Based on export coefficient model, the paper combines the rainfall from 1999 to 2008 and the remote sensing data of 2009, and investigates the relationship between the land use and export coefficient model by using linear optimization method to ensure different export coefficients. We integrated into GIS technology to derived from different types of land use area and analyzed the relation- ship between export coefficients and land use area theorem. The reslalts show agricultural land export coeffi- cient is bigger than others and the contribution of agricultural pollution in non-point source was about 80%. Pollution load for COD and ammonia nitrogen was 5097.22 t/a and 427.06 t/a. Chemical oxygen demand of contribution was about 33%, ammonia nitrogen of contribution was about 29.4%. The non-point source pollution is the focus of watershed pollution control work, which can provide technical support for typical demonstration of water pollution control unit in the future.