基于MIKE11的污染河流水质改善最佳方案研究

选择合肥市"西南生态补水"重点工程涉及水域十五里河为研究对象,针对氨氮和总磷这两个主要污染物指标,基于MIKE11构建水动力水质耦合模型,模拟分析不同补水方案下的水质改善效果。结果表明,当河道上游祁门路桥下(补水点1)的补水流量为1. 2 m^3/s、中游京台高速桥下(补水点2)和杨前村下河道(补水点3)的补水流量为0. 7 m^3/s时,对河流的水质改善效果最佳,氨氮和总磷浓度的下降率分别为75. 45%和68. 28%,可使50%以上的河段达到地表水Ⅴ类标准,为污染河流的治理提供了新思路。

Exploration of the Optimal Scheme for Improving Water Quality of a Polluted River Based on MIKE11

A model of hydrodynamic and water quality was established to predict the main pollutants containing ammonia nitrogen and total phosphorus based on MIKE11. Effect of water quality improvement was simulated under different water recharge schemes in Shiwuli River, which was in the key project of "Southwest Ecological Water Replenishment" in Hefei City. The results showed that the best improvement effect of water quality was achieved when the water supply rates of recharge point 1 , 2 and 3 were 1. 2 m^3/s, 0. 7 m^3/s and 0. 7 m^3/s respectively. Decrease rate of ammonia nitrogen and total phosphorus was 75.45% and 68. 28%, and 50% of the river segments reached the class Ⅴ standard of surface water, which provided new ideas for the treatment of polluted rivers.