湛江湾电厂脱硫酸性废水排放对海洋叶绿素影响研究

The impact of the acidic effluent discharge from power plant on chlorophyll in Zhanjiang Bay

为了清晰理解湛江湾内某电厂脱硫酸性废水排放引起海水pH的变化分布及其对叶绿素浓度的影响,在野外调查及实验室模拟的基础上建立叶绿素浓度对pH的响应模式,并基于ECOMSED海洋模式和水质模型预测湛江湾叶绿素浓度的变化率和影响范围。实验室模拟结果表明,叶绿素浓度受pH影响较大,比较适宜叶绿素合成的pH区间为7.5-8.5,叶绿素浓度对pH的响应模式可以用二次多项式函数表达。预测结果表明,电厂脱硫酸性废水排放导致湛江湾叶绿素浓度下降超过1.0%的全潮极端影响面积为16.10 km^2,而引起叶绿素浓度增加超过1.0%的全潮极端影响面积为2.18 km^2,分别占湛江湾海域面积的8.47%和1.15%。

To investigate the effect of the acidic effluent from power plants draining into Zhanjiang Bay on the sea water pH changes and chlorophyll concentration. The mode of chlorophyll concentration to pH was established through field survey and laboratory simulation. Then, ECOMSED and water quality model were applied to predict the change rate and influenced scope of chlorophyll in Zhanjiang Bay. The experimental results showed that the chlorophyll concentration was significantly impacted by pH. The pH range of 7.5 to 8.5 is the optimal pH range for chlorophyll synthesis. The responsing mode of chlorophyll concentration to pH may be defined by a quadratic equation. The predicted results showed that the extreme area of chlorophyll concentration decreased 1.0%is 16.10 km2 during the spring and neap tide, when the acidic effluent from power plants drained into Zhanjiang Bay. But, the extreme area of chlorophyll concentration increased 1.0%is 2.18 km^2 during the spring and neap tide. The percentages of extreme area were 8.47% and 1.15% of Zhanjiang Bay, respectively.