淀山湖富营养化控制的模型研究

Simulation Study on Eutrophication Control in DianShan Lake

针对淀山湖富营养化严重的问题,应用USEPA的AQUATOX模型对淀山湖水体中营养盐时间变化规律和藻类生长演替进行了研究。在对模型率定、验证的基础上,对水力条件、污染源等富营养控制方案的效果进行模拟。模拟结果显示:该生态模型较好地模拟了常规水质和藻类的动态变化;改善淀山湖的水力条件,能有效控制蓝藻水华的暴发;淀山湖污染负荷主要来自于上游负荷;在控磷和控氮的对比上,蓝藻对于控制磷比较敏感。对于淀山湖富营养化的治理应采取控源与生态修复并举的方式,这样有利于有效稳定水质改善的效果。

The Dianshan Lake is suffered from eutrophication problem. Based on the experimental data, the AQUATOX （USEPA） model was applied and developed to simulate the nutrition distribution and phytoplankton behavior in Dianshan Lake. Beyond the temporal distribution of nutrition and the seasonal growth of algae, effect of eutrophication control scheme was conducted in Dianshan Lake.The modeling result is in good coincide with the lab findings and the in-situ measurements. The results indicated that good hydraulic condition is beneficial to the algae control;the loads of nutrients （nitrogen and phosphorus） in Dianshan Lake mainly come from upstream;and Blue-green algae is more sensitive on the Phosphorus than Nitrogen. However, to control eutrophication in shallow lakes must take both external loading of nutrient and internal ecological restoration.