基于MIKE 21的汾河水库挟沙水流水质数值模拟研究

为了揭示悬浮泥沙(SSC)对水库水质的影响规律,对汾河水库进行样品收集和长期水质监测,采用水动力模型与泥沙转移和富营养化模型相结合的方法,将这三者关联耦合,并通过实测数据对模型进行参数率定和验证,分析含沙水和不含沙水中总氮(TN)、总磷(TP)、叶绿素a(Chla)、溶解氧(DO)四项指标,得出两者对水质造成的影响。结果表明:SSC对TN、TP的去除作用明显,对Chla、DO浓度分布影响较小,并计算了污染物的释放量以及贡献率,得出TP的负荷仅为16.47t,而贡献率高达25.25%。因此在汾河的污染控制方面应侧重削减磷,进而改善汾河地区的污染现状。

A Numerical Simulation Study of Sand-Carrying Water Quality of Fenhe Reservoir Based on MIKE21 Model

In order to reveal the influence law of suspended sediment on the water quality of reservoir,samples were collected and long-term water quality monitoring was carried out,the hydrodynamic model is combined with sediment transport and eutrophication model,and the three were correlated and coupled,and the parameter calibration and verification of the model were carried out through measured data.,The total nitrogen,total phosphorus,chlorophyll-a and dissolved oxygen in the sandy and non-sandy water were analyzed,the impact of the two on water quality were obtained.The results showed that suspended sediment has an obvious effect on the removal of total nitrogen and total phosphorus but has little effect on the distribution of chlorophyll-a and dissolved oxygen concentration.The release amount and contribution rate of pollutants were calculated,the load of TP is only 16.47t,and the contribution rate is as high as 25.25%.Therefore,the pollution control of the Fenhe River should focus on reducing phosphorus,so as to improve the current pollution status of the Fenhe River pollution.