水网连通对大东湖富营养化的影响

为定量评价水网连通对湖泊富营养化的影响,以武汉大东湖水网连通为研究对象,构建大东湖水网水生态环境数学模型,在模拟分析水网连通前后COD、TN、TP、Chl-a等富营养化评价指标变化的基础上,进一步计算和评价水网连通对各湖泊综合营养状态指数、营养状态的影响。计算结果表明:水网连通后,杨春湖、沙湖、北湖水质改善,藻类生物量减少,水体富营养程度降低;东湖、严西湖水质有一定恶化,藻类生物量增加,水体富营养程度升高;水网连通对湖泊富营养化的影响较复杂,且存在污染风险。研究成果可为水网连通工程的管理运行提供参考依据。

Effect of Water Network Connection on Eutrophication of the Great Donghu Lake

To quantify the effect of water network connection on eutrophication, we established a mathematical water eco-environmental model of the Great Donghu Lake Network as a case study. Having simulated and analyzed the variations of eutrophication indices inclusive of COD, TN, TP and Chl-a before and after water network connection, we assessed the effect of water network connection on the comprehensive trophic state index and trophic states of lakes. Our findings manifested that after the water network connection, the water quality in Yangchun Lake, Shahu Lake and Beihu Lake improved, and the algae biomass and eutrophication level decreased; whereas the water quality in the East Lake and Yanxi Lake deteriorated, and the algae biomass and the eutrophication level increased. The results indicated that the effect of water network connection on eutrophication was complex with pollution risks. The research results offer reference for the management and operation of water network connection project.