小流域非点源污染负荷流失特征监测研究——以广东省珠海正坑小流域为例

Monitoring on Loss Characteristics of Non-point Source Pollutants——An Case Study at Zhengkeng Watershed in Zhuhai City of Guangdong Province

以广东省珠海正坑小流域为例,通过对小流域次降雨事件中径流流量及其非点源污染物浓度随降雨—径流过程的变化的监测研究发现,径流初期流量急剧增加,达峰值后逐渐衰减;污染物浓度变化与流量变化趋势基本相似,除可溶磷、CODCr和BOD5在整个过程中变化比较平稳外,T—N,NH4+—N,T—P,NO3-—N以及SS的浓度峰值几乎同时出现,所不同的是污染物浓度峰值均比径流流量峰值提前,待污染物峰值出现后,随即开始衰减。

In the course of whole precipitationrunoff, the concentration of the nonpoint source pollutants in runoff changes are monitored and studied. The results are as follows: the concentration of every pollutant is high in early stage of producing flow, then tends to decline. For the soluble pollutant, the concentration ranges small, like milder wavilness in the course of whole precipitationrunoff. As for difficult dissolving pollutant, particularly for total phosphorus, the concentration in the course of whole changes acutaly like zigzag. This indicates that there is certain confinement to the concentration scope dissolved and achieved for dissolve component under a certain water environment condition. Its dissolving characteristics are influenced obviously possibly by the water environment condition than by the flow rate change.