松花江流域水环境化学耗氧量模拟及参数分析

Simulation of the COD change and parameter analysis in Songhua River Watershed

摘要:

为进一步探讨松花江流域佳木斯段COD降解特性,利用水团追踪及罗丹明B示踪实验,采用水质数学模型分析结合水团追踪实测数据,重点研究佳木斯江段平水期和冰封期的COD模型,识别相应特征参数,验证模型的有效性．结果表明:通过罗丹明B示踪实验分析,确定了松花江佳木斯段横向扩散系数为0.41 m²/s,纵向扩散系数为43.51 m²/s;水团追踪实验方法确定了松花江佳木斯段COD衰减系数K(20)=0.188;对松花江佳木斯段COD模型参数进行了温度参数修正K(T)=0.188×1.109 8T-20．松花江佳木斯江段的实测结果和模型模拟结果误差在10％以内,证明了模型应用和所获得参数的有效性．

Abstract:

To explore the COD degradation characteristics of Jiamusi section at Songhua River, water mass tracing and Rhodamine-B tracing were used to investigate the COD model of the normal river flow season and icebound season of Jiamusi section. The corresponding characteristic parameters were identified, the diffusion characteristics of river water quality of the Jiamusi section were discussed, and the validity of the model was verified by the water quality mathematical model and water mass tracing. The results showed that by Rhodamine-B tracing, the transverse diffusion coefficient of the Jiamusi section was 0.41 m²/s, and the longitudinal diffusion coefficient is 43.51 m²/s. The COD attenuation coefficient K(20)=0.188; the COD model parameters were corrected at any temperature K(T)=0.188×1.109 8T-20. The relative error of the measured results and the simulation results were both within 10％, which proved that the COD model and the corresponding parameters were effective.