污染物入海通量非点源贡献率的分析方法

Research on Analysis Method of Non-Point Source Contribution of Land-Based Pollutants Fluxes

针对采用控制断面实测通量进行点源与非点源分割的常规方法,容易夸大非点源贡献率的情况,提出简易分割技术,在概念上明确改进的方法,从实用的角度提出以月径流量与月通量相关系数确定丰水期通量增量的非点源比例系数,建立简单的估算公式,以辽东湾主要入海河流之一的大凌河为例,利用2003年实测数据对大凌河进入辽东湾的高锰酸盐指数、总氮、总磷、石油类、氨氮等入海通量进行计算分析,得到对不同污染物不同分割比例的较为合理的结果.该方法对于闸控调节导致的入海径流反季节变化的情况不一定适用,但可以采用类似的思路进行研究.

As the conventional method of dividing the point source and non-point source which adopts control section measurement is prone to magnify the contribution of non-point source, a method based on improvement of simplified division method was presented. From practical point of view, a non-point source proportionality coefficient which determined the increment of flux during high water period by the con＇elation coefficient of runoff volume per month and flux per month was brought in, and an easy estimation formula was established. Take Daling River as an example, fluxes of CODMn, total nitrogen, total phosphorus, petroleum, and ammonia nitrogen were calculated and analyzed based on monitored records of 2003. The results are more reasonable than traditional division method for various pollutants in different division rate. This method is not applicable for change of entrance flux caused by gate-control, but the research can adopt similar manner.