BOD-DO simulation and parameter analysis of Songhua River watershed

In order to accurately simulate, predict and evaluate the water environmental system of the Songhua River, O'Connor water quality model was used to establish BOD-DO response relation of the Songhua River. A huge mass of data were obtained by water mass tracing to realize model parameter identification, sensitivity analysis and model validation. The results show that by water mass tracing, the oxygen consumption coefficient, the reaeration coefficient and the total attenuation coefficient of the Songhua River are reasonable and can meet the requirements of water quality simulation. The temperature parameters of BOD-DO model of the Songhua River were corrected by the correction equations. The sensitivity analysis of model parameters show that the atmospheric reaeration coefficient of K_a and NBOD oxygen consumption coefficient of K_n are main influence factors on the prediction results with less influence of CBOD oxygen consumption coefficient of K_d, while NBOD total attenuation rate of K_m and CBOD total attenuation rate of Kr have the slightest influence. The BOD-DO model and the corresponding parameters are improved by the measure results of Jiamusi section of the Songhua River to give research basis for further simulation of water environmental system.