规划环评中海湾水环境容量的计算方法

A method for calculation of environmental capacity of bay water during planning environmental impact assessment

为进一步提高规划环评中海湾水环境容量预测结果的合理性和准确性,基于潮流数学模型和物质输运数学模型,通过试算法,提出了一种基于混合区概念的计算海湾水环境容量的新方法。结果表明,通过新方法预测的海湾环境容量符合国家规范要求,能充分考虑排污口附近最大允许混合面积、海湾生态敏感区分布状况、多排污口同时排放下的叠加影响等因素。该方法被运用于福建省湄洲湾规划环评的环境容量测算,分析了海湾湾口、湾中和湾内不同动力环境下差异化的水污染承载能力。认为考虑最大混合允许范围的环境容量预测方法可优化海湾排污口的布置,促进海湾经济规划发展的合理布局。

Reasonability and accuracy are the major concerns when predicting the environmental capacity of bay water during planning environmental impact assessment .To further improve these two aspects , we present a new calculation mode with the concept of a mixing zone using the trial method based on mathematical models of tidal flow and solute transport .Research results show that the environmental capacity predicted by the new method meets the requirements of the national code , and it fully considers the factors such as the maximum allowable mixing area near the sewage outfall , the distribution of ecologically sensitive areas in the bay , and the accumulated effects of simultaneous drainage from multiple sewage outfalls .The new method was used to calculate the environmental capacity of Meizhou Bay , in Fujian Province , during its planning environmental impact assessment , in order to analyze the pollutant carrying capacity of different parts of the water body with different dynamic environments at the bay mouth , and in the middle and inner bay .This new calculation mode can optimize the layout of sewage outfalls and coordinate the layout of economic development along coastal areas .