小清河流域无机氮非点源污染的量化研究

利用数学模型对小清河流域无机氮次暴雨径流污染和非点源污染年负荷进行量化分析。结果表明,流域次暴雨径流污染主要由农田非点源污染造成,而非点源污染年负荷不仅包括暴雨径流污染负荷,还包括非暴雨径流污染如水产养殖业和农村生活废水不定期排放造成的污染负荷;利用几场实测次暴雨径流污染物浓度加权平均值计算流域非点源污染年负荷会使计算结果偏小。此外,SCS和USLE模型在应用到下垫面复杂的流域时,其参数可通过数学率定确定,模拟结果表明可行。

Quantified Study on Inorganic Nitrogen from Non- point Source Pollution in the Xiaoqing River Basin

The simple storm-runoff pollution and the annual non-point source pollution loading of inorganic nitrogen in Xiaoqing River basin were calculated by using the mathematic model.The simple storm-runoff pollution mainly arised from agricultural non-point source pollution,while,the annual non-point source pollution loading in the basin included not only the storm-runoff pollution loading but also the pollution loading arising from non-periodic discharge of wastewater from aquatic breeding and rural living.The calculated value based on the several storm-runoff contamination concentrations was less than the annual non-point pollution loading.When using SCS and USLE model in the basin of complicated geomorphologic factors,the parameter can be calculated by mathematic method,which proved to be practicable by rain-runoff and soil erosion simulation.