摘要
SP模型应用于高污染河流的水质分析时,因起始BOD浓度大,得出负数的DO临界值,而导致SP模型失效。本研究以BOD浓度L与自净系数f、氧亏值D乘积fD的比较为判据,分析耦合微分方程的性质及大气复氧速率之间的变化关系,通过将BOD—DO变化划分为三个阶段,完成了BOD浓度衰减及大气复氧过程的求解,这一改进可以有效弥补SP的模型缺陷。
When SP model is applied in the high polluted river water quality analysis, the DO critical value may be a negative number, because of the high initial BOD value. So the previous SP model loses effectiveness. This study depends on the comparison of the BOD value L and the arithmetic product of self-purification factor f and oxygen deficit value D, analyse the relationship between the nature of couple differential equation and the rate of air complex oxygen, and divide the BOD-DO curve into 3 phases. This modification can effectively make good the former SP model's fault.
出处
《中国环境监测》
CAS
CSCD
北大核心
2004年第5期54-57,共4页
Environmental Monitoring in China
关键词
河流水质模型
BOD衰减
大气复氧
river water quality model
BOD attenuation
air complex oxygen
